Aluminum or Stainless Steel
Aluminum or Stainless Steel with Bargraph
Canadian Standards Association Atmosphères ExplosiblesEuropean ConformityIECEx Approval


  • Fully-Approved Explosion-Proof Loop-Powered Meter
  • 4-20 mA Input with ±0.03% Accuracy
  • 3.0 Volt Drop (6.0 Volt Drop with Backlight)
  • Easy Field Scaling in Engineering Units without Applying an Input
  • 0.7" (17.8 mm) 5 Digits Main Display
  • 0.4" (10.2 mm) 7 Alphanumeric Characters Secondary Display
  • Display Mountable at 0°, 90°, 180°, & 270°
  • SafeTouch Through-Glass Button Programming
  • HART® Protocol Transparent
  • Loop or External DC-Powered Backlight Standard
  • Operating Temperature Range: -40 to 75°C (-40 to 167°F)
  • Installation Temperature Range: -55 to 75°C (-67 to 167°F)
  • CSA Certified as Explosion-Proof / Dust Ignition-Proof / Flame-Proof
  • ATEX and IECEx Certified as Explosion-Proof
  • Conformal Coated PCBs for Dust and Humidity Protection
  • Password Protection
  • 32-Point Linearization, Square Root Extraction and Programmable Exponent Function
  • Wide Viewing Angle
  • Built-In Flange for Wall or Pipe Mounting
  • Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum & Stainless Steel Enclosures
  • Two 3/4" NPT or M20 Conduit Openings
  • 2" U-Bolt Kit Available
  • 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.

Loop-Powered Connections

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


Hazardous Area Loop-Powered Meter

The PD6800 is a rugged, full-featured, explosion-proof loop-powered meter ideal for demanding applications in hazardous areas or in the harshest environmental conditions.

The product is CSA Certified as Explosion-Proof / Dust Ignition-Proof / Flame-Proof and ATEX & IECEx Certified as Explosion-Proof. It is available in either an aluminum or stainless steel enclosure with ¾" or M20 conduit connections. It will operate down to -40°C and is approved for installation in areas where the temperature gets as cold as -55°C, however the display will cease functioning.

The meter derives all of its power from the 4-20 mA loop, thus making installation a simple matter of wiring the instrument into the existing loop. No external power is required. Programming is performed using the four SafeTouch through-glass buttons and can be done without removing the cover. In addition, the meter can be scaled with or without a calibration signal.

The backlit LCD display consists of two lines with the addition of a 20-segment bargraph on the PD6800-0L1. The main line of the display has five full digits and is used to display the process variable. The secondary line has seven alphanumeric characters and is used for a tag, engineering units, or displaying the input in different units (for the PD6800-0L1). For instance, on the PD6800-0L1, the top line could display the height of the tank in feet and the bottom line could display the same input in gallons. The bargraph provides a quick visual of the current state of the process variable. The backlight makes the display visible under any lighting condition and can be powered from either the 4-20 mA loop or from a separate DC power supply.

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


DisplayFive digits
(-9999 to 99999)
0.70" (17.8 mm) high, 7-segment,
automatic lead zero blanking.
Seven characters0.4" (10.2 mm) high, 14-segment.
SymbolsHigh & Low Alarm, Password Lock
Display OrientationDisplay may be mounted at 90° increments up to 270° from default orientation.
Display AssignmentLower display may be assigned to custom unit or tag.
Display Update Rate

Ambient > -25°C: 2 Updates/Second
Ambient < -25°C: 1 Update/5 Seconds

BacklightWhite; Loop-powered or externally powered. Backlight can be enabled or disabled via alternative wiring of terminal block. Loop-powered backlight brightness will increase as the input signal current increases. Externally powered backlight has consistent brightness.
Externally Powered
Voltage Range: 9-36 VDC
Supply V  9 VDC  12 VDC  24 VDC  36 VDC
Max Pwr  0.2 W  0.25 W  0.5 W  0.75 W
Display OverrangeDisplay flashes 99999
Display UnderrangeDisplay flashes -9999
Programming MethodFour SafeTouch through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
Noise FilterProgrammable LO, med, HI, or OFF
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.
Advanced FunctionLinear, square root, or programmable exponent
PasswordProgrammable password restricts modification of programmed settings.
Non-Volatile MemoryAll 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
EnvironmentalOperating temperature range: -40 to 75°C (-40 to 167°F)
Storage temperature range: -55 to 75°C (-67 to 167°F)
Installation temperature range: -55 to 75°C (-67 to 167°F)
(The display ceases to function below -40°C)
Relative humidity: 0 to 90% non-condensing
Printed circuit boards are conformally coated
ConnectionsScrew terminals accept 12 to 22 AWG wire
MountingMay be mounted directly to conduit. Built-in flange for wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm pipe mounting.
Overall Dimensions5.65" x 5.25" x 4.86"
(W x H x D)
(144 mm x 133 mm x 124 mm)
WeightAluminum: 4.8 lbs (2.18 kg)
Stainless Steel: 8.7 lbs (4.3 kg)
Warranty3 years parts and labor. See Warranty Information and Terms & Conditions on for complete details.


Input4-20 mA
Accuracy±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span.
Maximum Voltage Drop & Equivalent ResistanceWithout Backlight or with Externally Powered BacklightWith Loop Powered Backlight
3.0 VDC @ 20 mA6.0 VDC @ 20 mA
150 Ω @ 20 mA300 Ω @ 20 mA
Temperature Drift50 PPM/°C from -40 to 75°C ambient
Multi-Point Linearization2 to 32 points
Programmable ExponentUser selectable from 1.0001 to 2.9999 for open channel flow
Low Flow Cutoff0-99999 (0 disables cutoff function)
Point below at which display always shows zero.
Decimal PointUser selectable decimal point
Minimum SpanInput 1 & Input 2: 0.10 mA
Calibration RangeAn Error message will appear if input 1 and input 2 signals are too close together.
Input Range
4-20 mA
Minimum Span Input 1 & Input 2
0.10 mA
Input OverloadOver current protection to 2 A max.
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.


MaterialAL Models: ASTM A413 LM6 die-cast aluminum, copper-free, enamel coated
SS Models: ASTM A743 CF8M investment-cast 316 stainless steel
Gasket (O-Ring)Fluoroelastomer
RatingNEMA 4X, IP68 Explosion-proof
ColorAL: Blue
SS: Silver
WindowBorosilicate glass
ConduitsPD6800-0K0: Two 3/4" NPT
PD6800-0K0-M20: Two M20
PD6800-0K0-SS: Two 3/4" NPT
PD6800-0K0-SS-M20: Two M20
PD6800-0L1: Two 3/4" NPT
PD6800-0L1-M20: Two M20
PD6800-0L1-SS: Two 3/4" NPT
PD6800-0L1-SS-M20: Two M20
FlangesBuilt-in flange for wall and pipe mounting.
Tamper-Proof SealCover may be secured with tamper-proof seal
Instrument Tag LoopBuilt-in loop for securing stainless steel tag
ATEX & IECEx (ProtEX+ enclosure only)Flame-Proof Protection
Ex db IIC Gb
Ex tb IIIC Db
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
Tamb: -55°C to +85°C
Certificate Number: CSA 19.80011200U
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
Tamb: -55°C to +85°C
Certificate Number: E518920

Note: The above approvals are for the enclosure only. See below for approval on the entire instrument.

Product Ratings & Approvals

Explosion-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: CSA 11 2325749
ATEXExplosion-Proof for use in:
      ATEX Ex II 2 G D
      Ex db IIC T6 Gb
      Ex tb IIIC T85°C Db IP68
      Ta = -55 to 75°C
      Certificate Number: Sira 10ATEX1116X
IECExExplosion-Proof for use in:
      Ex db IIC T6 Gb
      Ex tb IIIC T85°C Db IP68
      Ta = -55 to 75°C
      Certificate Number: IECEx SIR 10.0056X


Input Signal Conditioning

Live Input Calibration

In lieu of meter scaling, the meter can be calibrated with a precision signal source. While applying a precision signal, the relative scale value is entered via the front panel. This is done at any two points along the scale. Using this method, the operator can set a "best fit straight line" for non-linear input spans.

Multi-Point Linearizer

Up to 32 linearization points can be selected under the Linear function. The multi-point linearization can be used to linearize the display for non-linear signals such as those from level transmitters used to measure volume in odd-shaped tanks or to convert level to flow using weirs and flumes that require a complex exponent. These points are established via direct entry (SCALE) or with an external calibration signal (CAL).

Square Root Extraction

The square root extraction function displays flow rate by extracting the square root from a differential pressure transmitter signal. The user selectable low-flow cutoff feature gives a reading of zero when the flow rate drops below a user selectable value.

Programmable Exponent

The programmable exponent function is used to linearize the level signal in open channel flow applications using weirs and flumes and display flow rate and units of measure.



Front View
Side View
Top View

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