The ProtEX-MAX PD8-6262 offers all the functionality of the ProVu PD6262 as a fully FM, CSA, ATEX, and IECEx approved explosion-proof product. It is specifically designed to display flow rate and total from two (2) analog output (4-20 mA, 0-5 V, 1-5 V, etc.) flowmeters. It displays these signals on a dual-line, 6-digit Sunbright® sunlight readable display. The two display lines can be used to show both flow rates simultaneously, to alternate between the two inputs showing both the flow rate and total of each, or to show the result of math functions performed on the flow rates and totals. The total overflow feature allows up to 9-digit totals and grand totals to be displayed. The PD8-6262 includes a 24 VDC power supply to drive the flowmeter and can be equipped with up to four internal relays and a 4-20 mA analog output. It can be programmed and operated without opening the housing by using the built-in SafeTouch® through-glass buttons or the RS485 serial communication port with free Modbus® protocol.

Quick Overview

  • Input: Two analog inputs, each separately field selectable; 0-20 mA, 4-20 mA; ±10 VDC (0-5, 1-5, 0-10 V); Modbus PV (slave)
  • Display: Dual-line 6-digit, 0.60" (15 mm) & 0.46" (12 mm)
  • Case: Smooth die-cast aluminum explosion-proof
  • Power: 85-265 VAC or 12/24 VDC option
  • Operating Temperature: -40 to 65°C


  • SunBright display standard
  • Rate, Total, and Grand Total for Each Input Channel
  • Addition, difference, absolute difference, average, multiplication, division, min of A or B, max of A or B, draw, weighted average, and ratio math functions including total and grand total math
  • Isolated 24 VDC @ 25 mA transmitter power supply
  • 32-point linearization with free software
  • Total, grand total, or non-resettable grand total
  • SafeTouch through-glass button programming
  • Modbus RS-485 serial communications
  • Flanges for wall or pipe mounting
  • Isolated 24 VDC @ 25 mA transmitter power supply

General PD8 Enclosure Specifications

Weight: approx.16.0 lbs. (7.3 kg)

Product Ratings and Approvals

CSA Certified: Class I, Division 1, Groups B, C, D
  Class II, Division 1, Groups E, F, G
  Class III, Division 1
  Class 1 Zone 1 Ex d IIC; Zone 21 Ex tb IIIC T90°C
  -40°C < Tamb. < +60° C; Temperature Code T6
  -40°C < Tamb. < +65° C; Temperature Code T5
  Enclosure Type 4X & IP66
  Certificate Number: 12 2531731
ATEX Certified II 2 G D
  Ex d IIC T6 Gb
  Ex tb IIIC Db IP68
  -40°C to +85°C
  ATEX Certificate: Sira 12ATEX1182
IECEx Certified Ex d IIC Gb
  Ex tb IIIC Db IP68
  -40°C to +85°C
  Certificate Number: IECEx SIR 12.0073
FM Approved Enclosure: Type 4X; IP66
  Class I, Division 1, Groups B, C, D
  Class II, Division 1, Groups E, F, G
  Class III, Division 1, T5/T6
  Class I, Zone 1, AEx d, IIC Gb T5/T6
Zone 21, AEx tb IIIC T90°C
  Ta -40°C to +65°C
  T6 Ta = -40°C to +60°C
  T5 Ta = -40°C to +65°C
  Certificate Number: 3047283


Display: Upper display: 0.60" (15 mm) high. Lower display: 0.46" (12 mm) high. 6 digits each (-99999 to 999999), red LEDs with lead zero blanking.
Display Intensity: Eight user selectable intensity levels
Display Update Rate: (PD6262): 5/second (200 ms) (PD6363): Rate: 10 per second; up to 1 per 100 seconds (and is a function of Low Gate setting); Total: 10 per second (fixed)
Overrange: Display flashes 999999
Underrange: Display flashes -99999
Display Assignment: The Upper and Lower displays may be assigned to show: One or more rate channels: Channel A (Ch-A), B (Ch-B), or C (Ch-C), Toggle between rate channels: Ch-A & Ch-B, Ch-A & Ch-C, Ch-B & Ch-C, and Ch-A, Ch-B, & Ch-C, Total or grand total: Ch-A or Ch-B, Rate and total or grand total: Ch-A, Ch-B, Relay set points, Max and/or min values: Ch-A, Ch-B, or Ch-C, Toggle between any rate channel & units, Toggle between any rate/math channel & units, Total and units: Ch-A or Ch-B, Toggle between totals: Ch-A & Ch-B; Ch-A, Ch-B, and sum of Ch-A and Ch-B, Modbus input. The lower display may also be set to show engineering units or be off, with no display.
Programming Methods: Four front panel buttons, digital inputs, PC and MeterView Pro software, Modbus registers, or cloning using Copy function.
Max/Min Display: Max/min readings reached by the process are stored until reset by the user or until power to the meter is cycled.
Password: Three programmable passwords restrict modification of programmed settings and two prevent resetting the totals.
   Pass 1: Allows use of function keys and digital inputs
   Pass 2: Allows use of function keys, digital inputs and editing set/reset points
   Pass 3: Restricts all programming, function keys, and digital inputs.
   Total: Prevents resetting the total manually
   Gtotal: Prevents resetting the grand total manually
Noise Filter: (PD6262) Programmable from 2 to 199 (0 will disable filter)
Filter Bypass: (PD6262) Programmable from 0.1 to 99.9% of calibrated span
Non-Volatile Memory: All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Recalibration: All ranges are calibrated at the factory. Recalibration is recommended at least every 12 months.
Power Options: 85-265 VAC 50/60 Hz, 90-265 VDC 20 W max, or jumper selectable 12/24 VDC ±10%, 15 W max.
Fuse: Required external fuse: UL Recognized, 5 A max, slow blow; up to 6 meters may share one 5 A fuse.
Isolated Transmitter Power Supply: Terminals P+ & P-: 24 VDC ± 10%. Selectable for 24, 10, or 5 VDC supply (internal jumper J4).
ProVu Series (PD6262/PD6363): 85-265 VAC models rated @ 200 mA max, 12/24 VDC powered models rated @ 100 mA max, @ 50 mA max for 5 or 10 VDC supply. ProtEX-MAX (PD8 Series): All models transmitter supply rated @ 25mA max.
Normal Rejection Mode: (PD6262) Greater than 60 dB at 50/60 Hz
Isolation: 4 kV input/output-to-power line. 500 V input-to-output or output-to-P+ supply.
Overvoltage Category: Installation Overvoltage Category II: Local level with smaller transient overvoltages than Installation Overvoltage Category III.
Environmental: ProVu Series (PD6262/PD6363): Operating Temperature Range: -40 to 65°C, Storage Temperature Range: -40 to 85°C, Relative Humidity: 0 to 90% non-condensing
ProtEX-MAX (PD8 Series): T6 Class operating temperature range Ta = -40 to 60°C, T5 Class operating temperature range Ta = -40 to 65°C
See LIM8 ProtEX-MAX instruction manual for additional details.
Max Power Dissipation: ProtEX-MAX (PD8 Series): Maximum power dissipation limited to 15.1 W. See LIM8 ProtEX-MAX instruction manual for additional details.
Connections: Removable screw terminal blocks accept 12 to 22 AWG wire, RJ45 for external relays, digital I/O, and serial communication adapters.
Enclosure: 1/8 DIN, high impact plastic, UL 94V-0, color: black
Mounting: 1/8 DIN panel cutout required: 3.622" x 1.772" (92 mm x 45 mm). Two panel mounting bracket assemblies are provided.
Tightening Torque: Screw terminal connectors: 5 lb-in (0.56 Nm)
Dimensions: 4.68" x 2.45" x 5.64" (119 mm x 62 mm x 143 mm) (W x H x D)
Weight: 9.5 oz (269 g)
Warranty: 3 years parts & labor

Dual Input Functionality

Analog Inputs: (PD6262) Two inputs, each separately field selectable: 0-20, 4-20 mA, ±10 V (0-5, 1-5, 0-10 V), Modbus PV (Slave)
Pulse Inputs: (PD6363) Two, Field selectable: Pulse or square wave 0-5 V, 0-12 V, or 0-24 V @ 30 kHz; TTL; open collector 4.7 kΩ pull-up to 5 V @ 30 kHz; NPN or PNP transistor, switch contact 4.7Ω kpull-up to 5 V @ 40 Hz; Modbus PV (Slave) Channels: Channel A, Channel B, Channel C (Math channel)
Programmable Constants: Constant P (Adder): -99.999 to 999.999, default: 0.000, Constant F (Factor): 0.001 to 999.999, default: 1.000

Sequence of Operations for Input Programming:
   1.  Select Input for A and B
   2.  Set up the rate, total, and grand total engineering units for channels A & B, and units for math channel C
   3.  Set up rate, total, and grand total decimal points for channels A & B, and decimal point for math channel C
   4.  Program channel A & B rate parameters
   5.  Program channel A & B total and reset parameters
   6.  Set up the big and little displays and display intensity
   7.  Select the transfer function for A & B (e.g. Linear)
   8.  Select Math function for Channel C
   9.  Program constants for Factor (F) and Adder (P)
   10. Program cutoff values for A and B
Low Voltage Mag Pickup: (PD6363) Sensitivity: 40 mVp-p to 8Vp-p
Minimum Input Frequency: (PD6363) 0.001 Hz Minimum frequency is dependent on high gate setting.
Maximum Input Frequency: (PD6363) 30,000 Hz (10,000 for low voltage mag pickup)
Accuracy: (PD6262) ±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span
(PD6363) ±0.03% of calibrated span ±1 count
Temperature Drift: 0.005% of calibrated span/&deg,C max from 0 to 65°C ambient, 0.01% of calibrated span/°C max from -40 to 07°C ambient
(PD6363) Rate display is not affected by changes in temperature.
Signal Input Conditioning: (PD6262) Linear, square root, programmable exponent.
Multi-Point Linearization: 2 to 32 points for channel A and B
Programmable Exponent: (PD6262) 1.0001 to 2.9999
Low-Flow Cutoff: 0-999999 (0 disables cutoff function)
Decimal Point: Up to five decimal places or none: d.ddddd, dd.dddd, ddd.ddd, dddd.dd, ddddd.d, or dddddd.
Calibration Range (PD6262):

Input Range Minimum Span
Range Input 1 & Input 2
4-20 mA 0.15 mA
±10 V 0.10 V

An Error message will appear if input 1 and input 2 signals are too close together.

Calibration Range (PD6363): Input 1 signal may be set anywhere in the range of the meter; input 2 signal may be set anywhere above or below input 1 setting. Minimum input span between any two inputs is 10 Hz.
An error message will appear if the input span is too small.
Calibration: (PD6363) May be calibrated using K-factor, internal calibration, or by applying an external calibration signal.
Input Impedance: (PD6262) Voltage ranges: greater than 500 K Ω. Current ranges: 50 - 100 Ω (depending on resettable fuse impedance).
Input Overload: (PD6262) Current input protected by resettable fuse, 30 VDC max. Fuse resets automatically after fault is removed.
K-Factor: (PD6363) Field programmable K-factor converts input pulses to rate in engineering units. May be programmed from 0.00001 to 999,999 pulses/unit.
Filter: (PD6363) Programmable contact de-bounce filter: 40 to 999 Hz maximum input frequency allowed with low speed filter.

Time Base: (PD6363) Second, minute, hour, or day
Gate: (PD6363) Low gate: 0.1-99.9 seconds, High gate: 2.0-999.9 seconds
F4 Digital Input Contacts: 3.3 VDC on contact. Connect normally open contacts across F4 to COM.
F4 Digital Input Logic Levels: Logic High: 3 to 5 VDC, Logic Low: 0 to 1.25 VDC

Dual Rate/Totalizer

Rate Display Indication: 0 to 999999, lead zero blanking.

Total Display & Total Overflow: 0 to 999,999; automatic lead zero blanking. Up to 999,999,999 with total-overflow feature. "oF" is displayed to the left of total overflow.
Total Decimal Point: Up to five decimal places or none: d.ddddd, dd.dddd, ddd.ddd, dddd.dd, ddddd.d, or dddddd. Total decimal point is independent of rate decimal point. Channel A and B decimal points programmed independently.
Dual Totalizer: Calculates total for channels A and B based on rate and field programmable multiplier to display total in engineering units. Time base must be selected according to the time units in which the rate is displayed. Channel A and B totalizer parameters programmed independently.
Totalizer Rollover: Totalizer rolls over when display exceeds 999,999,999. Relay status reflects the display value.
Total Overflow Override: Program total A or B total reset for automatic with 0.1 second delay and set point 1 for 999,999
Totalizer Alarm Presets: Up to eight, user selectable under setup menu. Any set point can be assigned to channel A or B total or grand total (or C) and may be programmed anywhere in the range of the meter for total alarm indication.
Total & Grand Total Reset: Via front panel button, external contact closure on digital inputs, automatically via user selectable preset value and time delay, or through serial communications. Channel A and B total and grand total reset parameters programmed independently.
Total Reset Password: Total and grand total passwords may be entered to prevent resetting the total or grand total from the front panel.
Non-Resettable Total: The grand totals can be programmed as non-resettable totals by entering the password "050873". Both channels are set to non-resettable when this password is entered. Caution: Once the Grand Total has been programmed as "non-resettable" the feature cannot be disabled.
Programmable Delay on Release: 0.1 and 999.9 seconds; applied to the first relay assigned to total or grand total. If the meter is programmed to reset total to zero automatically when the preset is reached, then a delay will occur before the total is reset.


Rating: 2 or 4 SPDT (Form C) internal and/or 4 SPST (Form A) external; rated 3 A @ 30 VDC and 125/250 VAC resistive load; 1/14 HP (≈ 50 W) @ 125/250 VAC for inductive loads
Noise Suppression: Noise suppression is recommended for each relay contact switching inductive loads.
Relay Assignment: Relays may be assigned to channel A or B rate, total, or grand total; channel C; or Modbus control.
Deadband: 0-100% of span, user programmable
High or Low Alarm: User may program any alarm for high or low trip point. Unused alarm LEDs and relays may be disabled (turned off).
Relay Operation: automatic (non-latching), latching (requires manual acknowledge), sampling (based on time), pump alternation control (2 to 8 relays), off (disable unused relays), and manual on/off control mode.
Relay Reset: User selectable via front panel buttons, digital inputs, or PC
   1. Automatic reset only (non-latching), when input passes the reset point.
   2. Automatic + manual reset at any time (non-latching).
   3. Manual reset only, at any time (latching).
   4. Manual reset only after alarm condition has cleared (latching).
Note: Front panel button or digital input may be assigned to acknowledge relays programmed for manual reset.
Time Delay: 0 to 999.9 seconds, on & off relay time delays. Programmable and independent for each relay.
Fail-Safe Operation: Programmable and independent for each relay.
Note: Relay coil is energized in non-alarm condition. In case of power failure, relay will go to alarm state.
Auto Initialization: When power is applied to the meter, relays will reflect the state of the input to the meter.

Isolated 4-20 mA Transmitter Output

Output Source: Input channels A or B, rate, total, or grand total; channel C; max or min for channel A or B; highest or lowest max or min of A and B; set points 1-8; Modbus input; or manual control mode.
Scaling Range: 1.000 to 23.000 mA for any display range
Calibration: Factory calibrated: 4.000 to 20.000 = 4-20 mA output
Analog Output Programming: 23.000 mA maximum for all parameters: Overrange, underrange, max, min, and break
Accuracy: ±0.1% FS ±0.004 mA
Temperature Drift: 0.4 µA/°C max from 0 to 65°C ambient, 0.8 µA/°C max from -40 to 0°C ambient
Note: Analog output drift is separate from input drift.
Isolated Transmitter Power Supply: Terminals I+ & R: 24 VDC ±10%. May be used to power the 4-20 mA output or other devices.
ProVu Series (PD6262/PD6363): All models rated @ 40 mA max.
ProtEX-MAX (PD8 Series): All models @ 25 mA max.
External Loop Power Supply: 35 VDC maximum
Output Loop Resistance:

      Power supply Minimum Maximum
      24 VDC 10Ω 700Ω
      35 VDC (external) 100Ω 1200Ω

Serial Communications

Protocol: Modbus® RTU
Meter Address/Slave ID: 1 - 247
Baud Rate: 300 - 19,200 bps
Transmit Time Delay: Programmable between 0 and 199 ms
Data: 8 bit (1 start bit, 1 or 2 stop bits)
Parity: Even, odd, or none with 1 or 2 stop bits
Byte-to-Byte Timeout: 0.01 - 2.54 seconds
Turn Around Delay: Less than 2 ms (fixed)
Note: Refer to the ProVu Modbus Register Tables for details

Digital I/O Expansion Module

Channels: 4 digital inputs & 4 digital outputs per module
System: Up to 2 modules for a total of 8 inputs & 8 outputs
Digital Input Logic: High: 3 to 5 VDC Low: 0 to 1.25 VDC
Digital Output Logic: High: 3.1 to 3.3 VDC Low: 0 to 0.4 VDC
Source Current: 10 mA maximum
Sink Current: 1.5 mA minimum
+5 V Terminal: To be used as pull-up for digital inputs only

4-Relay Expansion Module

Relays: Four Form A (SPST) rated 3 A @ 30 VDC and 125/250 VAC resistive load; 1/14 HP (≈ 50 watts) @ 125/250 VAC for inductive loads.

Dual Analog Output Expansion Module

Outputs: Two passive 4-20 mA analog outputs

Scaling Range: 3.000 to 23.000 mA for any display range


Differential Pressure Flow (PD6262)

The PD8-6262 can display flow rate and total by extracting the square root from the 4-20 mA signal from differential pressure transmitters. The user selectable low-flow cutoff feature gives a reading of zero when the flow rates drop below a user selectable value.

  • Display Flow Rate
  • User Selectable Low-Flow Cutoff
  • Only 2 Calibration Points Required

Open Channel Flow (PD6262)

The PD8-6262, in combination with ultrasonic level transmitters, makes for an easy and convenient way to measure and display open channel flow rates and totals in most weirs and flumes, and take periodic samples. All the user needs to do is enter the exponents for the weirs or flumes into the PD8-6262 and the PD8-6262 automatically raises the input signals to those powers. Sampling can be based on the total flow or the flow rate. Each channel's signal input conditioning is programmed independently.

Weir Flow Calculated Using Exponential Signal Input Conditioning

Convert Pulse to 4-20 mA (PD6363)

The PD8-6363 accepts pulse outputs from flowmeters and with the appropriate option installed, can convert the pulses to a 4-20 mA signal. The 4-20 mA signal can be programmed to correspond to either the flow rate or the total flow.

  • Use K-Factor or Multi-Point Scaling
  • ProVu Powers the Flowmeter
  • Up to 3 Analog Outputs


MeterView® Pro Software

MeterView Pro Video
MeterView Pro software is designed for use with ProVu meters and allows users to remotely program, monitor, and datalog using a PC. Remote programming allows for all available meter settings to be programmed through an easy user-friendly interface. The user can monitor and display most of the meters variables at variable update rates. The data acquisition feature allows the user to gather readings from a meter at user-selected intervals and generate charts using common tools like Microsoft Excel. A linearization setup function is also included. With this utility the user can configure up to 32 linearization points and upload them to the meter. All configuration data can be saved to a file for future use. This software is available for ProVus having software versions 2.0 and higher.

To determine the software version of a meter:

  1. Go to the Diagnostics menu () and press Enter button.
  2. Press Up arrow button and scroll to Information menu (Info).
  3. Press Enter to access the software number (), version (), and serial number () information. Write down the information as it is displayed. Continue pressing Enter until all the information is displayed.
  4. The meter returns to Run Mode after displaying all the settings.

Click here for more information about MeterView Pro.
Click here to watch and introductory video on MeterView Pro.

Monitor and Datalog

Monitor and Datalog







PDA7485 RS-232 to RS-422/485 Converter

The PDA7485 converts unbalanced, full-duplex RS-232 signals to balanced, full or half-duplex RS-422 or RS-485 signals. The -I version is the isolated version.

Click here to order this accessory.

PDA8008 ProVu® to USB Serial Adapter

The PDA8008 converts the serial output of the ProVu® to industry standard USB.

The PDA8008 is the perfect adapter to use with the ProVu when the only serial communication required is for MeterView Pro running on a PC. It is the least costly option as well. USB and meter to adapter cables are included.

Click here to order this accessory.

PDA6846 Mounting Kit

PDA6846 Pipe Mounting Kit

Pipe Mounting Kit for PD6800, PD6801, PD6820, PD6830, PD6830X, PD6870 and PD8 (PD8 requires 2). Includes zinc-plated u-bolt for 2" pipe, (2) washers, and (2) nuts.

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