Search This Site

(Search by Product Type i.e. Level or Brand Name i.e. Walchem)

PD6800 ProtEx-Pro Explosion-Proof Loop-Powered Process & Level Meter

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

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

PD6800 Data Sheet
PD6800 Instruction Manual

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/ºC
  • 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 O @ 20 mA without loop-powered backlight. 300 O @ 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

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.


About Us

Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


Our Products

Dataloggers, sensors, pumps, recorders, hand held instruments, flow instrumentation, level controls, valves, instrumentation, containers, tanks, transmitters, data loggers, digital indicators, mixers and agitators, pressure intrumentation, analyzers and controllers for a variety of industrial applications such as water quality, pH/ORP and more.

Website Content

Water Analyzers and Controllers, Wireless Products, Corrosion Monitoring Equipment, Cooling Tower and Boiler Controllers, a wide variety of Pumps, Valves, Dataloggers and Recorders, HVAC, Instrumentation, Skids and Systems, Containers and Tanks from world leading manufacturers are products you will find on this site.

Get in Touch