The ProtEX-Pro PD6800 is one of Precision Digital's most advanced and feature-packed explosion-proof, loop-powered indicators. The fact that this meter is loop-powered means that there is no need to run additional, costly power lines into a hazardous area. Like all ProtEX products, the PD6800 carries FM, CSA, ATEX, and IECEx approvals for use in hazardous areas. It features a dual-line display that can be easily scaled in the field for any 4-20 mA analog input. The display has a five digit upper display, a seven alpha-numeric character lower display, and is available with a twenty-segment bar graph for level applications. Two features that really make the PD6800 stand out are its wide viewing angle display and SafeTouch® through-glass buttons. These buttons allow the PD6800 to be programmed and operated through the glass, thus eliminating the need to remove the cover in a hazardous area.


  • 4-20 mA Input Loop-Powered
  • Modern, Sleek and Practical Enclosure for Hazardous Locations
  • 5-Digit, 0.7" (17.8 mm) Upper Display (0.6" for -0L1 Models)
  • Optional Level Indicator Bar Graph
  • 7 Alphanumeric Character, 0.4" (10.2 mm) Lower Display
  • SafeTouch® Through-Glass Button Programming
  • Password Protection
  • 32-Point , Square Root, or Exponential Linearization
  • Loop or External DC-Powered Backlight Standard
  • 3.0 V Drop (6.0 V with Backlight)
  • Explosion-Proof, IP68, NEMA 4X Enclosure
  • Flanges for Wall or Pipe Mounting
  • HART Protocol Transparent
  • Operates from -40 to 75°C


Display: Upper: Five digits (-9999 to 99999) 0.70" (17.8 mm) high, 7-segment, automatic lead zero blanking;
-0L1:0.6" high with level bar graph. Lower: Seven characters 0.4" (10.2 mm) high, 14 segment alphanumeric. Symbols: for high & low alarm, Password Lock. Backlight: White
Decimal Point: Upper process display has up to four decimal places or none: d.dddd d.ddd, d.dd, d.d, or ddddd
Display Update Rate: Ambient > -25°C: 2 Updates/Second. Ambient < -25°C: 1 Update/5 Seconds
Display Orientation: Display may be mounted at 90° increments up to 270° from default orientation.
Overrange: Display flashes 99999
Underrange: Display flashes -9999
Programming Method: Four SafeTouch® through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
Noise Filter: Programmable - Lo, Med, Hi, or Off
Recalibration: Recalibration is recommended at least every 12 months.
Max/Min Display: Max/Min readings reached by the process are stored until reset by the user or until power to the meter is turned off.
Password: Programmable password restricts modification of programmed settings.
Advanced Functions: Live input calibration, linearization, square root, or programmable exponent
Alarm Indication: Flashing display plus HI/LO indicators
Non-Volatile Memory: All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Normal Mode Rejection: 64 dB at 50/60 Hz
Operating Temperature Range: -40 to 75°C.
Storage Temperature Range: -40 to 85°C.
Relative Humidity: 0 to 90% non-condensing
Connections: Screw terminals accept 12 to 22 AWG wire
Enclosure: Explosion-proof die-cast aluminum with glass window, corrosion resistant epoxy coating, color: blue. NEMA 4X IP68. Copper-free (0.3%). Two &frac34" NPT threaded conduit openings. One ¾" NPT metal conduit plug with 12 mm hex key fitting installed.
Mounting: May be mounted directly to conduit. Two slotted flanges for wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm pipe mounting.
Overall Dimensions: 5.65" x 5.25" x 4.86" (W x H x D) (144 mm x 133 mm x 124 mm)
Weight: 5.00 lbs (80 oz, 2.27 kg)
Warranty: 3 years parts and labor


Input range: 4-20 mA
Accuracy: ±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span.
Temperature Drift: 50 PPM/°C
Decimal Point: User selectable decimal point
Calibration Range: An 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
Maximum Voltage Drop: 3.0 VDC @ 20 mA without loop-powered backlight. 6.0 VDC @ 20 mA with loop-powered backlight
Equivalent Resistance: 150 Ω @ 20 mA without loop-powered backlight. 300 Ω @ 20 mA with loop-powered backlight
Input Overload: Over current protection to 2 A max.
External Loop Power Supply:

Voltage Range Maximum Power
9-30 VDC 9 VDC 12 VDC 24 VDC 30 VDC
  0.2 W 0.25 W 0.5 W 0.75W

Open Collector Output (-0L1 Models Only)

Rating: Isolated open collector, 30 VDC @ 150 mA max.
Alarm Output: Assign to level or volume for high or low alarm trip point.
Deadband: 0-100% FS, user selectable
Acknowledge: Front panel ENTER button and external RESET terminals resets output and screen indication.

Product Ratings & Approvals

FM: Explosion-proof for use in Class I, Division 1, Groups B, C, D. Class II, Division 1, Groups E, F, G. Class III, Division 1; T6. Class I, Zone 1, AExd IIC T6 Gb. Zone 21, AEx tb IIIC T85°C. Ta = -40 to 75°C.
Enclosure: Type 4X & IP66. Certificate number: 3040391
ATEX: II 2 G D. Ex d IIC T6 Gb. Ex tb IIIC T85°C Db IP68. Ta = -40 to 75°C.
Certificate number: Sira 10ATEX1116X
IECEx: IECEx SIR 10.0056X. Ex d IIC T6 Gb. Ex tb IIIC T85 C Db IP68. Ta = -40 to 75°C
CSA: Class I, Division 1, Groups B, C, D. Class II, Division 1, Groups E, F, G. Class III, Division 1; T6. Class I, Zone 1, Ex d IIC T6.
Ta = -40 to 75°C. Enclosure: Type 4X & IP66.
Certificate number: 11 2325749


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.



PDAPLUG75 3/4" NPT 316 Stainless Steel Stopping Plug


3/4 inch NPT threaded stainless steel conduit plug. ATEX and IECEX approved.


Ex II 2 G D/I M2

Ex d I/IIC, Ex e I/II

Ex tD A21 IP6X


Ex dIIC/ Ex e II/ Ex tD A21 IP6X

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PDA0001 ¾" M-NPT to M20 Approved Reducer

PDA0001 ¾

¾" M-NPT to M20 Approved Reducer for the PD6800, PD6801, PD6820, PD6830 and PD6870.

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PDA0002 ¾" M-NPT to ½" F-NPT Approved Reducer

¾" M-NPT to ½" F-NPT Approved Reducer for the PD6800, PD6801, PD6820, PD6830 and PD6870.

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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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