Canadian Standards Association Atmosphères ExplosiblesEuropean Conformity

Features

  • Fully-Approved Explosion-Proof & Intrinsically Safe Loop-Powered Flow Rate/Totalizers
  • 4-20 mA Input Displayed with ±0.02% of Full-Scale Accuracy
  • 1.5 Volt Drop (4.7 Volt Drop with Backlight)
  • 0.7" (17.0 mm) 5 Alphanumeric Characters Top Display
  • 0.4" (10.2 mm) 8 Alphanumeric Characters Bottom Display
  • 20-Segment Bargraph Standard
  • CapTouch Through-Window Button Programming with Normal and Delayed Modes
  • Loop-Powered Backlight with Red Backlight for Alarm Conditions
  • 8-Digit Total & Grand Total Display, Up to 13 Digits Using Both Lines
  • Display Rate & Total Simultaneously
  • Automatic or Manual Batch Control
  • Display Open Channel Flow with Programmable Exponent Feature
  • 32-Point Linearization and Square Root Extraction
  • (2) Open Collector Outputs Standard; Assignable to Pulse, Alarm, Timer, or Stopwatch
  • (2) Optional Loop-Powered Solid-State Relays; Assignable to Alarm, Control, Timer, or Stopwatch
  • Stopwatch & Timer Functions to Drive Relays & Open Collectors
  • Optional Isolated 4-20 mA Analog Output
  • Free PC-Based MeterView XL USB Programming Software
  • Operating Temperature Range: -40 to 75°C (-40 to 167°F)
  • Installation Temperature Range: -55 to 75°C (-67 to 167°F)
  • Conformal Coated PCBs for Dust & Humidity Protection
  • CSA Certified for Explosion-Proof / Dust-Ignition Proof / Flame-Proof
  • ATEX and IECEx Certified as Intrinsically Safe
  • Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum & Stainless Steel Enclosures
  • 3-Year Warranty

Why Use Loop-Powered Meters?

The most basic decision a user wishing to display a 4-20 mA signal on a digital display has to make is: should the meter be powered by line voltage or should it be powered by the 4-20 mA loop?

There are three main benefits of using loop-powered devices:

  • No additional power required
  • Easy wiring
  • Additional digital displays can easily be added in the same loop

The following diagram illustrates how a loop-powered meter is wired. Notice there are only two connections made to the meter.

For more information on loop-powered meters, check out Fundamentals of Loop-Powered Devices and Loop-Powered vs Line-Powered Meters white papers.

Overview

Hazardous Area Loop-Powered Flow Rate/Totalizers with Advanced Display and Control Features

The ProtEX+ loop-powered explosion-proof & intrinsically safe flow rate/totalizer can be installed virtually anywhere to provide convenient and informative display of any 4-20 mA signal. They can operate down to -40°C and be installed in areas that get as cold as -55°C, however the display will cease functioning. One of the most convenient features is the dual-line display, typically used to display the flow rate on the 5-character alphanumeric top display and flow total, flow grand total, or tag on the 8-character alphanumeric bottom display. The top display uses 12-segment, and the bottom display uses 14-segment alphanumeric characters for clear indication of tags, units, or alarm messages. Further enhancing the display on these instruments is a 20-segment bargraph.

The ProtEX+ Series is CSA Certified for Explosion-Proof / Dust-Ignition Proof / Flame-Proof and ATEX and IECEx Certified as Intrinsically Safe.

Four CapTouch through-glass buttons are available to operate the instrument without removing the cover. The CapTouch buttons have two modes of operation: Normal and Delayed, and they can be disabled for security via a switch on the display module.

All models come equipped with two open collector outputs and a digital input. There are also models available with two solid-state relays and isolated 4-20 mA analog output options. The open collector outputs are useful for alarm indication or pulse output. The digital input can be used to remotely reset the total, to start/stop a timer/stopwatch, and more. The relays can be programmed for alarm indication, sample, timer, batch control, or stopwatch.

Free, PC-based, MeterView XL software that connects to the meter via a micro USB cable is available for programming and setup of the meters. This software greatly simplifies the programming process and also allows the user to save configuration files for later use. The meter will also be powered by the USB connection so no additional power is needed during programming.

For safe area versions of these instruments please click here.

Front

PD6928-HA in Aluminum
PD6928-HA-AL
  • Flow Rate/Totalizer
  • Aluminum
PD6928-HA in Stainless Steel
PD6928-HA-SS
  • Flow Rate/Totalizer
  • Stainless Steel

Connections

Standard
  • (2) Open Collector Outputs Standard (150 mA max); Assignable to Pulse, Alarm, Timer, or Stopwatch
  • Digital Input for Remote Operation of a Single Task
Options
  • (2) Loop-Powered Solid-State Relays; Assignable to Alarm, Control, Timer, or Stopwatch
  • Isolated 4-20 mA Analog Output

Display Features

PD6928 Flow Rate/Totalizer with Bargraph

Wide Variety of Display Capabilities

In addition to the most common setup of flow rate on the top display and flow total on the bottom display, these meters can be set up for a variety of display configurations as shown in the following examples.

See the instruction manual for additional display possibilities for both top and bottom display.

Flow Rate and Toggle Between Units and Tag Flow Rate and Toggle Between Units & Tag

Display flow rate on top, toggle between rate units and tag on bottom

Flow Total and Toggle Between Units and Tag Flow Total and Toggle Between Units & Tag

Display flow total on top, toggle between total units and tag on bottom

Flow Total and Flow Grand Total and Toggle Between Units Flow Total & Flow Grand Total and Toggle Between Units

Display total flow on top and Grand Total flow on bottom, and display toggles between values and units. Notice Grand Total can use different units than Total.

Commas on bottom display

Commas Make it Easy to Read Big Numbers

The bottom display is set to show a comma separating the thousands and millions place by default if a numeric value is being displayed. This feature can be disabled or enabled using the Comma menu.

13-Digit Total Enabled

Using 13 Digits to Display Total

The top and bottom displays can be setup to display a 13-digit total (9,999,999,999,999). The total will roll over to zero when it exceeds the limit.

Meter with Red Backlight

Backlight Turns Red on Alarm

The loop-powered backlight is standard on all ProtEX+ meters. It provides optimum visibility in any lighting condition and it can be programmed to turn red for alarm conditions. The backlight may be enabled or disabled using the Backlight menu. The backlight is enabled by default (input must be wired appropriately for the loop-powered backlight to function).

Meter with Bargraph

Bargraph Provides Quick Understanding

The 20-segment bargraph helps users get a quick understanding of where their process is at. The bargraph can be programmed to represent either rate, a percentage of the rate, total, or it can be disabled.

Dual Scale Feature

Dual-Scale Display Feature

Users can use the dual-scale feature when they want to show the same input in two different scales. For instance, the example above shows an application where the meter displays the input in gallons per minute and cubic feet per minute.

14-segment Characters Comparison

14-Segment Characters

Notice how much better letters like “T”, “N” and “K” appear as 14-segment characters on the bottom display vs. 7-segment characters found on other meters.

Predefined and Custom Units

The meter has the most common predefined rate and volume units. If the desired unit is not available, the user can program a custom unit.

Total & Rate in Different Units

The user can select to display total in different units than the rate. For instance, a customer could measure flow rate in gallons per minute and total in acre-feet by simply selecting AF (acre-feet) units for the total. Additionally the user can enter a custom unit and conversion factor to display the total in any unit of measure.

CapTouch Through-Window Buttons

All PD6928 meters are equipped with four capacitive sensors that operate as through-window buttons so that they can be operated without removing the cover (and exposing the electronics) in a hazardous area.

CapTouch buttons are designed to work under any lighting condition and to protect against false triggering. They can be disabled for security via a switch on the display module.

To actuate a button, press one finger to the window directly over the marked button area. When the cover is removed, the CapTouch buttons can be used after the meter completes a self-calibrating routine ( flashes). The sensors are disabled when more than one button is pressed, and they will automatically re-enable after a few seconds ( off).

CapTouch Buttons Operation Modes

The CapTouch buttons have two modes of operation: Normal and Delayed.

Normal

Normal is the factory default setting. This mode is recommended for programming the meter or when immediate operation of the buttons is needed.

Delayed

Use the Delayed mode to prevent accidental trigger of the buttons. In the Delayed mode, the buttons enter into a low sensitivity state (sleep) and they ignore quick button presses after 20 seconds of inactivity. To wake up the buttons, press and hold any button for more than 2 seconds, the buttons respond normally.

Disabling the CapTouch Buttons

The CapTouch buttons can be disabled by moving the slide switch, located on the display module to the Lock position; see the image below.

Switch to Disable CapTouch Buttons

Outputs

PD6928 meters come with two open collector outputs as standard and two solid-state relays and 4-20 mA output as options. The open collector outputs and relays generally operate in the same manner, with the major exception being the open collectors are not available for batch control and the relays are not available with pulse output features. The open collectors and relays can be controlled either automatically or manually. The alarm status (with a unique flashing red message for each of the two relays and open collectors) will show on the display even with no output wired.

Two Open Collector Outputs

The meter is equipped with two NPN open collector outputs that may be set up for pulse outputs, alarms, timed pulses, stopwatch on/off, or disabled. Pulse outputs can be set to transmit the rate, total or grand total. Output 2 may be used to generate a quadrature output based on the other open collector output. An output test mode is also selectable to generate pulses at a constant programmable frequency. The open collectors are commonly used to generate a pulse for every user-defined amount of flow that has been generated. For instance, the meter can be programmed to generate a pulse for every 100 gallons of flow.

Two Optional Solid-State Relays

The meter is optionally equipped with two solid-state relays that may be set up for alarms, sample, timer, batch control, or stopwatch. The relays are rated at 250 VAC/DC @ 0.5 A for resistive loads and 38 VA @ 0.3 A, 250 VAC/DC max (Safe Area only) for inductive loads. Alarms are available based on the PV value or the digital input.

Optional Isolated 4-20 mA Output

The isolated analog output signal can be configured to represent the rate, total or to retransmit the 4-20 mA input signal without the need to scale the output. While the output is nominally 4-20 mA, the signal will accurately accommodate under- and over-ranges from 1 to 23 mA. The output can be reverse scaled such that the meter’s high calibration value outputs 4 mA and the meter’s low calibration outputs 20 mA.

Loop-Powered Relay Alarm Trip

The two solid-state relays can be used as a loop-powered relay alarm trip. The meter’s two relays can be programmed for two different kinds of latching operation: Reset via momentary contact closure at any time or reset via momentary contact closure only after the alarm has cleared. And the meter’s display can be programmed to turn red and flash a unique custom alarm message for each relay – something not found on most loop-powered alarm trips.

Resetting the Open Collectors and Relays

The open collectors and relays (alarms) may be programmed to reset in the following ways:

  • Automatic (AUTO): Alarm will reset automatically once the alarm condition has cleared.
  • Automatic/Manual (AUTO.MAN): Alarm will reset automatically once the alarm condition has cleared but can also be reset using the Enter button (or whichever function key is set to acknowledge) at any time.
  • Latching (LATCH): Alarm must be reset manually and can be done so at any time. Press the Enter (ACK) button at any time to clear the alarm.
  • Latching with Reset after Cleared (L-CLEAR): Alarm must be reset manually and can only be done so after the alarm condition has cleared. Press the Enter (ACK) button after the alarm condition has cleared to reset the alarm.

Sampling Relay

A relay set to sample will trigger when the total or grand total value has incremented by a programmed amount. The relay can be programmed to stay on for a specified amount of time. For example: if a relay is set to sample the total with a COUNT of 1,000 and a TIME of 10 seconds, the relay will energize for 10 seconds each time the total increments by 1,000 (e.g. 1000, 2000, 3000).

Batch Control

The PD6928, when ordered with the two solid-state relays, can be used as a simple, one or two-stage batch controller. The user enters a preset and preclose value and sets the meter to either count up or count down. The top display will show the total and the bottom display will show the preset batch amount. The function keys are automatically changed so that F1 starts a batch, F2 opens the preset menu to allow the preset value to be changed, and F3 pauses/stops the currently running batch. Batching can be either automatic or manual.

Batch Control Operation Example

The following example shows how two-stage manual batch control functions with a PD6928. This setup will establish a 55-gallon preset for the batch, with a main valve (high flow) that will close at 50 gallons, and a trickle valve (low or restricted flow) that will close at 55 gallons. Because the first batch overruns by 0.10, the batch preset will be changed to 54.90 for the next batch to compensate for overrun.

If only one-stage batch control is desired, do not assign relay 2 to batch. The following pages show illustrations of how the above settings control the batch operation. The display assignment shown is the default.

ParameterSettingFunction
RELAY
OUTPUT 1
RLY 1
BATCH
Press Enter to assign relay 1 batch parameters.
BATCH
COUNT
UP or DOWNSetup batch to count up or down.
BATCH
MAXIMUM
100.00 GALThis setting prevents the operator from entering a preset value that exceeds a safety limit for the batch process.
BATCH
MODE
MANUAL or AUTOPress Enter to select manual or automatic batch control.
BATCH
PRESET
55.00 GALEnter the batch size.
BATCH
DELAY
ON & OFFEnter the On & Off time delays for relay 1, if desired.
ParameterSettingFunction
RELAY
OUTPUT 2
RLY 2
BATCH
Press Enter to assign relay 2 batch parameters.
BATCH
PRECLOSE
YES
PRECLOSE
5.00
Set the pre-close value to 5 to close the valve being controlled by relay 2 so it closes five gallons before reaching the preset.
BATCH
DELAY
ON & OFFEnter the On & Off time delays for relay 2, if desired.
RELAY
MESSAGE
MSG
RELAY 1
Enter a message to be displayed while relay 1 is on, if desired.
MSG
RELAY 2
Enter a message to be displayed while relay 2 is on, if desired.
Manual Batch Control

The manual batch control feature is used for batch processes that the operator wants to start manually. It can also be used where the batch size needs to be manually adjusted for each batch. The batch can be controlled by the button on the meter or the digital input.

Batch System Setup

System Setup

Both valves are closed with an empty barrel in place. The batched total is displayed in the upper display, the preset is selected for the lower display.

Batch Start

Batch Start

The START button or (F1) is pressed. Both valves open. The barrel begins to fill.

Preclose Valve

Preclose Valve

When the batch total reaches a value of 50.00 (Preset [55.00] – Pre-close [5.00]) the full-flow valve closes. The fill rate of the tank slows as a result.

Completed Batch

Completed Batch

When the batch is complete, the restricted flow valve closes. If overrun occurs, then the preset must be adjusted to compensate for the overrun amount. The next batch will only start after the START button or (F1) is pressed.

Overrun Correction

Overrun Correction

To compensate for overrun in the previous batch, adjust the preset to 54.90, so that the next batch is accurate (55.00).

Manual Start of Next Batch

Manual Start of Next Batch

A new, empty, barrel is put in place and the START button or (F1) is pushed to manually start the next batch.

Change Batch Size

Change Batch Size

While the process is stopped, a new preset fill amount may be selected with the Batch key (F2) for a different size barrel.

Pause/Stop

Pause/Stop

At any time, press the STOP button or Stop key (F3) once to pause the process, or twice to cancel the batch, which stops the process.

Resume Batch

Resume Batch

If the batch has been paused, then press START button or (F1) to resume the batch process.

Automatic Batch Control

The automatic batch control feature is used for batches that start automatically once the previous batch is completed. There is no opportunity for the operator to change the batch size between batches. The batch can be controlled by the button on the meter or the digital input.

Batch System Setup

System Setup

Both valves are closed with an empty barrel in place. The batched total is displayed in the upper display, the preset is selected for the lower display.

Batch Start

Batch Start

The START button or (F1) is pressed. Both valves open. The barrel begins to fill.

Preclose Valve

Preclose Valve

When the batch total reaches a value of 50.00 (Preset [55.00] – Pre-close [5.00]) the full-flow valve closes. The fill rate of the tank slows as a result.

Completed Batch

Completed Batch

When the batch is complete, the restricted flow valve closes. If overrun occurs, then the preset must be adjusted to compensate for the overrun amount.

Start Delay

Start Delay

After the batch is completed, the operator removes the full barrel and places an empty barrel; the new batch starts automatically after 60 seconds (Time Delay).

Automatic Start of Next Batch

Automatic Start of Next Batch

The next batch begins automatically after 60 seconds, both relays activate and both valves open.

Pause

Pause

At any time, press the STOP button or Stop key (F3) once to pause the process.

Resume Batch

Resume Batch

If the batch has been paused, then press START button or (F1) to resume the batch process.

Stop Process

Stop Process

At the end of the shift, press STOP button or Stop key (F3) twice to stop the batch process.

Totalizer Capabilities

PD6928 flow rate/totalizers can be programmed for a wide variety of totalizer applications. They can display total, grand total, or non-resettable grand total; the rate can be displayed with a time base of seconds, minutes, hours or days. The user can program a totalizer conversion factor, a non-resettable grand total, password protection, and several total reset methods.

Totalizer Conversion Factor & Multiplier

The user can enter a totalizer conversion factor that allows the meter to display total in different units than the rate. For instance, a customer could measure flow rate in gallons per minute and total in millions of gallons. A multiplier may be selected to automatically display the value in kGAL, MGAL, etc. Use the custom units to display the total in any unit of measure including units in languages other than English.

Total Alarms

The two open collectors and the two relays can be set up to alarm when the total reaches a user-defined set point. A variety of reset modes are available and the user can also program time delays and fail-safe operation.

Totalizer Password Protection

The total and grand total can be password protected so they can be reset only by authorized personnel.

Total Stored in Non-Volatile Memory

Total and grand total values, and all programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.

Non-Resettable Grand Total

The user can set up the grand total to be non-resettable by selecting YES for PERMLOCK in the Advanced - Grand Total - Reset menu. Once this is done, the grand total can never be reset.

Low-Flow Cutoff

The user may program the meter for a low-flow cutoff such that the meter displays zero below this point, regardless of the input value.

Input Signal Conditioning

To satisfy applications that require scaling in ways other than the usual 2-point linear method, the PD6928 can also be scaled for square root (differential pressure flow), or programmable exponent (open channel flow).

For existing processes that require these linearization capabilities, one of the great benefits of loop-powered meters is that they get their power directly from the 4-20 mA loop and thus require no additional wiring. All a user has to do is break the existing loop and wire in the meter. For this reason, loop-powered meters are very easy to add to existing applications such differential pressure or open channel flow.

Differential Pressure Flow

The PD6928 can display flow rate and total by extracting the square root from the 4-20 mA signal from a differential pressure transmitter. The user selectable low-flow cutoff feature gives a reading of zero when the flow rate drops below a user selectable value.

Differential Pressure Flow

Multi-Point Linearization

Meters are set up at the factory for linear function with 2-point linearization. Up to 32 linearization points can be selected for rate under the linear function. Multi-point linearization can be used to linearize the input for non-linear signals to convert level to flow using weirs and flumes with complex equations.

MeterView XL software makes it easy to program up to 32 points.

Multi-Point Linearization Using MeterView XL Software

Open Channel Flow

The PD6928, in combination with an ultrasonic level transmitter, makes for an economical way to measure and display open channel flow rate in most weirs and flumes. A guide such as the ISCO Open Channel Flow Measurement Handbook can provide the user with all the information needed: the exponent used in the flow equation for the desired flow units and the flow rate for any given head height. For example, to display the open channel flow rate from a 3" Parshall flume, the ISCO handbook advises the exponent is 1.547 and at the maximum head height of 3.0 feet, the flow rate is 3.508 MGD.

Open Channel Flow
FunctionDesireProgramming
Open Channel Flow3" Parshall flumeSet Programmable Exponent to 1.547
Flow RatewMillions of Gallons per Day (MGD)Set 4 mA = 0 &
20 mA = 3.508
Time base = Day
TotalMillions of GallonsSet Totalizer Conversion Factor = 1 (password protect total reset)
Non-Resettable grand totalProgram meter so grand total can never be resetSet non-resettable grand total
DisplayDisplay Flow Rate and Total at the same timeSet upper display for Grand Total and lower display to toggle between rate and total.
SamplingTake a 1 pint sample every 100,000 gallonsSet up relay for sampling and to trip every 0.1 million gallons. Set up sampling time such that 1 pint is sampled.

Physical Features

ProtEX+ Aluminum & Stainless Steel Enclosures

ProtEX+ Physical Features Overview
NEMA 4X / IP68 Rated Enclosure

NEMA 4X Enclosure

The ProtEX+ enclosure provides serious protection from the elements, high impact, corrosion, and dust. It is NEMA 4X/IP68 rated. In addition, the ProtEX+ enclosure provides protection against electrical interference and its extensive worldwide agency approvals allow it to be installed virtually anywhere.

PD6900 Mounted to a Pipe

Easy Pipe Mounting

The ProtEX+ comes with a built-in flange. This allows easy mounting to walls or pipes using either a PDA6846 Zinc Plated Steel or a PDA6846-SS Stainless Steel 2" U-Bolt Kit. A slot on the back of the enclosure makes it easy to center the unit on a pipe.

PD6900 Wide Angle Viewing

Wide Viewing Angle

The window and display module have been optimized to provide a wide viewing angle of approximately ±40°; nearly twice that of the competition.

PD6900 with Tamper Seal

Tamper-Proof Capability

The instrument can be made tamper-proof by inserting a wire through the built-in loop on the base of the enclosure and a hole in the lid of the enclosure and securing this wire with a lead seal.

PD6900 Rotatable Display Module

Rotatable Display Module

The display module can be rotated in 90° increments providing added mounting flexibility. Plus the various conduit connections allow a variety of installation options.

PD6900 with Stainless Steel Tag Attached

Stainless Steel Tag Attaching Loop

The enclosure is equipped with a loop at the top to easily attach a PDA-SSTAG stainless steel tag.

USB Port on Display Module

USB Port for Easy Connection to Free MeterView XL Software

A USB port located on the display module allows it to be connected to a PC for use with free MeterView XL software. The meter is powered by the USB connection during programming, if a 4-20 mA loop is not connected.

Conduit Opening

Two Threaded Conduit Openings

The ProtEX+ comes with two ¾" NPT threaded conduit openings as standard. It also available with M20 conduit openings as an option.

Conduit plugs available that are sold separately include the PDAPLUG75 3/4" NPT 316 stainless steel conduit plug with approvals and the PDAPLUGM20 M20 316 stainless steel conduit plug with approvals for models with M20 conduit openings.

Operational Features

There are two ways the user can interact with the ProtEX+ to perform a variety of useful functions: programmable function keys and the digital input.

Programmable Function Keys

The three CapTouch buttons labeled F1, F2, and F3 can be programmed as function keys to perform a variety of meter functions simply by pressing on the window over the button. These include resetting the total, operating the batch control functions, resetting the meter’s relays or open collectors, starting and stopping timers, and displaying max/min values. The default settings for the function keys are:

ButtonDescription (Default Settings)
Press to display grand total. Continue pressing to cycle through max, min, rate, and total displays.
Press to access the Reset menu. Press F1 to scroll through the options. Press F3 to reset the currently displayed parameter.
Press to acknowledge all manually resettable relays or open collectors.
Press to lock/unlock the display value after pressing the F1 key.

On-Board Digital Input

A digital input is standard on ProtEX+ meters. This digital input is programmed identically to the function keys. The input is triggered with a contact closure between DI+ and DI-, or with an active low signal. For a complete list of Digital Input settings available, see Function Keys & Digital Input Available Settings in the instruction manual.


Except where noted all specifications apply to operation at +25°C.

Display

DisplayDual-line LCD with backlight.
Both lines alphanumeric.
Top: 0.7" (17.8 mm) 5 digits, 12-segment
Bottom: 0.4" (10.2 mm) 8 characters, 14-segment
Display may be programmed to turn red and flash a user-defined message on alarm condition.
Top Display5 digits (-9999 to 99999) or 5 characters
(all capital & most lower-case letters)
Bottom Display8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters
(all capital & most lower-case letters)
BacklightPowered by 4-20 mA loop. Intensity varies with signal level.
Bargraph20 segments
Decimal PointUp to four decimal places on top display and up to seven decimal places on bottom display
CommasCommas to indicate 1000s
(e.g. 88,987,628) on bottom display only
Dual-Scale FeatureIf the totalizer is disabled, the input can be displayed in different scales on the top and bottom displays. For instance, the top display could display the flow in GPM and the bottom display could display that same input in CFM.
Alarm IndicationProgrammable: loop-powered red backlight, flashing display, alarm symbol ⚠, bargraph segment flashes on alarm.
Custom Alarm MessagesProgrammable for each relay/open collector: 8 characters maximum; displayed every 10 sec for 1 sec on bottom display. May be turned off.
Display Update RateAmbient > -10°C: 1 Update/Second
Ambient = -20°C: 1 Update/2 Seconds
From -20°C to -40°C the update rate slows down
1 second for every -2°C (e.g. at -24°C, 1 update/4 seconds).
OverrangeTop: 99999
Bottom: 99,999,999 (flashing)
UnderrangeTop: -9999
Bottom: -9,999,999 (flashing)


General

Programming MethodFour CapTouch through-window buttons when cover is installed. The CapTouch buttons can be used with the cover removed. Free PC-based USB MeterView XL programming software.
EnvironmentalOperating temperature range: -40 to 75°C (-40 to 167°F)
Storage temperature range: -55 to 85°C (-67 to 185°F)
Installation temperature range: -55 to 75°C (-67 to 167°F)
(The display ceases to function, however inputs and outputs continue to operate)
Relative humidity: 0 to 90% non-condensing
Printed circuit boards are conformally coated
Noise FilterAverages the input signal over a period of time between 1 and 16 seconds to dampen the effects of a noisy signal that causes a jumpy display.
Filter Bypass0.0 to 99.9% of full scale. Input signal changes greater than bypass value are displayed immediately.
RecalibrationRecalibration is recommended at least every 12 months.
Max/Min DisplayMax/min readings reached by the process are stored until reset by the user or until power to the meter is turned off.
PasswordThe Main password prevents access to the meter Programming Mode.
Total and Grand Total passwords prevent resetting the total and grand total, respectively.
Non-Volatile MemoryTotal and Grand Total values, and all programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Normal Mode Rejection64 dB at 50/60 Hz
ConnectionsRemovable screw terminal blocks
Display terminals: accept 16 to 30 AWG wire
Relay terminals: accept 12 to 26 AWG wire
4-20 mA output: accept 16 to 30 AWG wire
Tightening TorqueDisplay terminals: 2.5 lb-in (0.28 Nm)
Relay terminals: 4.5 lb-in (0.5 Nm)
4-20 mA output terminals: 2.5 lb-in (0.28 Nm)
Overall Dimensions5.25" x 5.65" x 4.80" (133 x 144 x 122 mm) (W x H x D)
WeightAluminum: 5.1 lbs (2.3 kg)
Stainless Steel: 9.4 lbs (4.3 kg)
Warranty3 years parts and labor. See Warranty Information and Terms & Conditions for complete details.


Enclosure

Material-AL Models:
ASTM A413 LM6 die-cast aluminum, copper-free, enamel coated
-SS Models:
ASTM A743 CF8M investment-cast 316 stainless steel
GasketFluoroelastomer
Rating-AL/-SS: NEMA 4X, IP68 Explosion-proof
Color-AL: Blue
-SS: Silver
WindowBorosilicate glass
ConduitsTwo 3/4" NPT threaded conduit openings. M20 conduits are available.
See Ordering Information for details.
PlugSold separately
FlangeBuilt-in flange for wall and pipe mounting.
Tamper-Proof SealCover may be secured with tamper-proof seal.
ATEX & IECEx (ProtEX+ enclosure only)Flameproof
ATEXII 2GD
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68
Tamb: -55°C to +85°C
Certificate No.: Sira 19ATEX1252U
Certificate No.: IECEx SIR 19.0075U
CSA (ProtEX+ enclosure only)Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Group E, F, G
Class III
Ex db IIC Gb
Ex tb IIIC Db
Class I, Zone 1, AEx db IIC Gb
Zone 21, AEx tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate No.: 80011200
UL (ProtEX+ enclosure only)Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Groups E, F, G
Class III
Class I, Zone 1, AEx db IIC Gb
Zone 21, AEx tb IIIC
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate Number: E518920


Input

Input4-20 mA
Accuracy±0.02% of span ±1 count
Square root and programmable exponent: 10-100% FS
Voltage DropWithout Backlight: 1.5 V maximum
With backlight: 4.7 V maximum
Equivalent ResistanceWith backlight off: 75 Ω @ 20 mA
With backlight on: 235 Ω @ 20 mA
Input OverloadOver current protection to 1 A maximum
Over voltage protection to 30 VDC max (between mA+ and mA-/BL-)
Temperature Drift25 PPM/°C from -40 to 75°C ambient
FunctionRate: Linear (2-32 points), square root, or programmable exponent.
If the totalizer is disabled, PV1 and PV2: Linear (2-32 points) or round horizontal tank
Low-Flow CutoffPoint below at which the display always shows zero.
0.1 to 999,999 or disable.
HART TransparencyThe meter does not interfere with existing HART communications; it displays the 4-20 mA primary variable and it allows the HART communications to pass through without interruption.
The meter is not affected if a HART communicator is connected to the loop. The meter does not display secondary HART variables.


Rate/Totalizer

Rate DisplayTop display: -9999 to 99999;
Bottom display: -9,999,999 to 99,999,999 (with commas)
Total & Grand Total DisplayTop display: 0 to 99999;
Bottom display: 0 to 99,999,999 (with commas)
13-Digit Total & Grand TotalUp to 9,999,999,999,999 using both lines with 13-digit total feature enabled.
Total & Grand Total IndicationOn bottom display, “T” indicates total and “GT” indicates grand total
Total Decimal PointUp to four decimal places on top, up to seven decimal places on bottom.
Total decimal point is independent of rate decimal point.
TotalizerCalculates total based on rate and rate units to display total in engineering units. A custom factor must be programmed if using custom defined units.
Time BaseSeconds, Minutes, Hours, Days
Totalizer RolloverTotalizer rolls over when display exceeds 99,999,999 (9,999,999,999,999
if 13-digit limit enabled). Relay status reflects display.
Total & Grand Total ResetVia CapTouch button, external contact closure on digital input, or MeterView XL.
Total & Grand Total Reset PasswordsTotal and grand total passwords may be entered to prevent resetting the total or grand total unless a password is entered.
Non-Resettable Grand TotalGrand total reset may be disabled through the meter interface. Grand total reset may be permanently disabled by selecting YES at the PERMLOCK menu.
CAUTION
• Once the Grand Total has been programmed as “non-resettable” the feature CANNOT be disabled.
Non-Volatile MemoryTotal and Grand Total values are stored in non-volatile memory for a minimum of ten years if power is lost.


Batch Control

MethodsAutomatic or Manual, count up or count down
Manual Batch StartPressing F1 function key starts the batch
Manual Batch Pause/StopPressing F3 once pauses the batch, pressing it twice cancels the batch
Automatic BatchingThe PD6928 can be used as an automatic batch controller where batches run continuously without operator input
Batching Relay OperationSingle or dual-relay batching with optional preclose for two-stage operation
Batch PresetSet via F2 function key anywhere between 0.0001 to 99,999 based on batch total decimal point. If batch total is assigned to bottom, the preset can be up to 8 digits.
Batch PrecloseFor two-stage batch application, a preclose value can be set to close the main flow line.
Automatic Batch Restart Delay1 to 9,999 seconds. The batch will automatically restart after completion of the last batch.


Common Open Collector & Relay Specifications

NumberTwo open collectors & two relays
High or Low AlarmUser programmable for high or low alarm
Alarm Deadband0-100% FS, user programmable
Output AssignmentAlarm, Timer, Stopwatch, or Disable
Alarm Output SourceAssign to rate, total, grand total, or digital input
On & Off Time Delay0 to 9,999 seconds
Fail-Safe OperationIndependent for each open collector and relay.
Fail-safe on, the output is on under normal conditions.
Fail-safe off, the output is on under alarm conditions.
Alarm OperationAutomatic, automatic with manual override, latching (manual reset anytime), latching with reset after cleared (manual reset only after alarm has cleared)
Alarm IndicationProgrammable: loop-powered red backlight, flashing display, alarm symbol ⚠, bargraph segment flashes on alarm.
Custom Alarm MessagesProgrammable for each relay/open collector: 8 characters maximum; displayed every 10 sec for 1 sec on bottom display. May be turned off.
Alarm AcknowledgeCapTouch ACK button or external digital input resets output and screen indication.
Auto InitializationWhen power is applied to the meter, open collectors and relays will reflect the state of the input to the meter.
Timer OutputOne-shot or Continuous
Off Time Delay: 1 sec to 99:59:59 (hrs:min:sec)
On Time: 1 sec to 99:59:59 (hrs:min:sec)
StopwatchOutput turns on when started and off when stopped.


Open Collector Outputs

RatingIsolated open collector, sinking NPN
5-30 VDC @ 150 mA maximum
Output AssignmentPulse, Alarm, Timer, Stopwatch on/off, or Disable
Pulse Output SourcePulse output based on Rate, Total, Grand Total, or Test Frequency, Alarm, Timer, Total Reset, Stopwatch on/off, or Disable
Pulse Output Factor0.000001 to 999,999.9
Pulse Width0.5 ms @ 1 kHz; 500 ms @ 1 Hz; 50% duty cycle
Pulse Output Frequency1,000 Hz maximum
Quadrature Pulse OutputAvailable for Output 2
(90° behind Output 1) 500 Hz max
Alarm Output SourceAssign to Rate, Total, Grand Total or Digital Input


Solid-State Relays

Rating250 VAC/VDC @ 0.5 A resistive
38 VA; 250 VAC; 0.3 A pilot duty (inductive)
13 VA; 250 VDC; 0.3 A pilot duty (inductive)
Noise SuppressionMetal oxide varistors across outputs
Relay AssignmentAlarm, Sample, Timer, Batch, Stopwatch on/off, or Disable
Alarm Output SourceAssign to Rate, Total, Grand Total, or Digital Input
Relay RuntimeMeter will keep track of how long each relay has operated and display this information.
Relay CyclesMeter will keep track of how many times the relays have cycled and display this information.


4-20 mA Transmitter Output

Accuracy±0.05% FS ±0.001mA
Output SourceRate, total, re-transmit; reverse scaling allowed
Scaling Range1.00 to 23.0 mA
DisableHigh impedance state, less than 1 mA
CalibrationFactory calibrated 4.00 to 20.00 mA
Underrange1.0 mA, 3.5 mA, or 3.8 mA (If input < 3.5 mA); or or Off; user selectable
Overrange20.5 mA, 20.8 mA, or 23.0 mA (If input > 20.5 mA); or Off; user selectable
Isolation500 V input-to-output
Temperature Drift0.5 μA/°C max from -40 to 75°C ambient
External Loop Power Supply7.0 VDC to 30.0 VDC maximum
Output Loop Resistance10-750 Ω @ 24 VDC; 10-1100 Ω @ 30 VDC


On-Board Digital Input

FunctionRemote operation of front-panel buttons, acknowledge/reset relays, reset total, reset max/min values, etc.
Contacts2.1 VDC on contact. Connect normally open contacts across DI+ and DI-
Logic LevelsLogic High: 2.4 to 30 VDC (max)
Logic Low: 0 to 0.9 VDC


MeterView XL Programming Software

AvailabilityFree download from www.predig.com/meterviewxl
System RequirementsMicrosoft® Windows® 7 & 10
CommunicationsUSB 2.0 (Standard USB A to USB B) Cable provided
ConfigurationConfigure all parameters on the meter. Configure meters one at a time.
Configuration FilesGenerate with or without meter connected; Save to file for later use.
USB Power ConnectionMeter is powered by USB connection during programming, if 4-20 mA loop is not connected.
WARNING
• The meter should only be connected to a computer while it is located in a safe area.
CompatibilityPrograms created for Loop Leader and Loop Leader+ may be run on either meter. Programs created for VantageView+ and ProtEX+ can be run on either meter. No other program sharing is permissible.


General Compliance Information

Electromagnetic Compatibility

EMC Emissions• CFR 47 FCC Part 15 Subpart B Class A emissions requirements (USA)
• ICES-003 Information Technology emissions requirements (Canada)
• AS/NZS CISPR 11 Group 1 Class A ISM emissions requirements (Australia/New Zealand)
• EN 55011 Group 1 Class A ISM emissions requirements (EU)
• EN 61000-6-4 Emissions requirements for Heavy Industrial Environments - Generic
EMC Emissions and ImmunityEN 61326-1
EMC requirements for Electrical equipment for measurement, control, and laboratory use – industrial use


Compliance Information

Hazardous Area Approvals

CSAExplosion-proof for use in:
Class I, Division 1, Groups B, C and D
Dust-ignition proof for use in:
Class II/III, Division 1, Groups E, F and G; T6
Flame-proof for use in:
Zone 1, Ex d IIC T6
Ta = -55 to 75°C.
Enclosure: Type 4X & IP66/IP68.
Certificate number: 2325749
ATEXATEXII 1 G D
Ex ia IIC T4 Ga
Ex ia IIC T200°C Da
Ta = -40 to 75°C
Enclosure: Type 4X & IP66/IP68.
Install per Control Drawing DW2636 (contained within LIM6908-2)
Certificate number: CML 18ATEX2089X
IECExII 1 G D
Ex ia IIC T4 Ga
Ex ia IIC T200°C Da
Ta = -40 to 75°C
Enclosure: Type 4X & IP66/IP68.
Install per Control Drawing DW2636 (contained within LIM6908-2)
Certificate number: IECEx CML 18.0050X

MeterView XL Programming Software

Free, PC-based, MeterView XL software that connects to the meter via a micro USB cable is available for programming and setup of the meters. This software greatly simplifies the programming process and also allows the user to save configuration files for later use. The meter will also be powered by the USB connection so no additional power is needed during programming.

MeterView XL Software
For more information visit www.predig.com/meterviewxl

Dimensions

Front View
Side View
Top View

Connections

Connectors Labeling

-LNN Base Meter (2 Open Collectors Standard)
-L2N Option (2 Solid-State Relays)
-L3N Option (4-20 mA Output)
-L5N Option (2 Solid-State Relays and 4-20 mA Output)

Wiring Diagrams

For existing applications, one of the great benefits of loop-powered meters is that they get their power directly from the 4-20 mA loop and thus require no additional wiring. All a user has to do is break the existing loop and wire in the meter.

WARNING
• See Control Drawing LIM6908-2 for information on hazardous area wiring.

Input Loop (4-20 mA) Connections

The following figures show a 4-20 mA loop connected to the meter. The first figure shows the connection without the backlight and the second shows the connection with the backlight. The meter is powered by the 4-20 mA current loop.

4-20 mA Input Connection without Backlight
4-20 mA Input Connection with Backlight

Digital Input Connections

A digital input is standard on the meter. This digital input is connected with a normally open contact across DI+ and DI-, or with an active low signal applied to DI+ and DI-.

4-20 mA Output Connections

Connections for the 4-20 mA transmitter output are made to the connector terminals labeled mA OUT. The 4-20 mA output must be powered from an external power supply.

Solid-State Relay Connections

Relay connections are made to two-terminal connectors. Each relay’s C terminal is common only to the normally open (NO) contact of the corresponding relay.

Open Collector Outputs Connections

Open collector output 1 and 2 connections are made to terminals labeled O1+ and O1-, and O2+ and O2-. Connect the alarm or pulse input device as shown below.

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