Precision Digital PD6800 ProtEx-Pro Level Meter

The Precision Digital ProtEX-Pro PD6800 is one of Precision Digital’s most advanced and feature-packed explosion-proof yet loop-powered indicators. The PD6800 meter is loop-powered, meaning there is no need to plug the more expensive power supply into hazardous areas. Like all Precision Digital ProtEX products, the PD6800 carries ATEX, CSA, IECEx, and FM approvals for applications in hazardous areas. The PD6800 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 while a seven alpha-numeric character lowers display and is available with a twenty-segment bar graph for level applications. Two main features that 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 and operate in a hazardous area.

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

General Specifications

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 ¾” 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.
HART Transparency: Analog input will not interfere with existing HART communications on the wired 4-20 mA signal
External Loop Power Supply:

Voltage RangeMaximum Power
9-30 VDC9 VDC12 VDC24 VDC30 VDC
 0.2 W0.25 W0.5 W0.75W

Open Collector Output (-0L1 skus 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 place of meter scaling, the meter can be calibrated with a precision signal calibrator. 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 Linearization

Up to 32 points of linearization 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 the 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.



Data Sheet: Precision Digital PD6800 Datasheets
Instruction Manual: Precision Digital PD6800 Instruction Manuals

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