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PD6801 ProtEX-F&I Explosion-Proof Loop-Powered Feet & Inches Level Meter

The ProtEX-F&I PD6801 is one of Precision Digital's most advanced and feature-packed explosion-proof, loop-powered indicators designed specifically for level applications that require a feet & inches display. The PD6801 can indicate up to 699 feet, 11 and 15/16 (or 7/8) inches. Like all ProtEX products, the PD6801 explosion-proof level indicator 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. Two features that really make the PD6801 stand out are its wide viewing angle display and SafeTouch® through-glass buttons. These buttons allow the PD6801 tank-side indicator to be programmed and operated through the glass, thus eliminating the need to remove the cover in a hazardous area.


  • Display Level in Feet & Inches
  • 4-20 mA Input Loop-Powered
  • Programmable 1/8 or 1/16 Inch Display
  • 20-Segment Tank Level Indicator
  • Lower Display for Tag, Volume, or Percent
  • SafeTouch® Through-Glass Button Programming
  • Open Collector Alarm Output
  • Loop-Powered or External DC-Powered Backlight Standard
  • Explosion-Proof, IP68, NEMA 4X Enclosure
  • Operates from -40 to 75°C

PD6801 ProtEX-F&I Explosion-Proof Loop-Powered Feet & Inches Level Meter Data Sheet

PD6801 ProtEX-F&I Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual

General Specifications

  • Display: Feet & Inches display: 0.60" (15.2 mm) high, 0 to 699 FT - 11 15/16 IN with 1/16 or 1/8 fraction display.
    Lower 7-digit display: 0.4" (10.2 mm) high, 14-segment alphanumeric characters, display tag, volume 0 to 9999999, and/or 0-100 percent.
    Tank Level Indicator: 20 segments, F (Full) and E (Empty)
    Alarm Indication: HI and LO; Backlight: White, loop or DC powered
  • Display Assignment: Lower display may be assigned to custom unit or tag, volume, volume and tag, percent height, percent height and tag, or off.
  • Display Update Rate: Ambient > -25°C: 2 Updates/Second Ambient < -25°C: 1 Update/5 Seconds
  • Overrange and Underrange: Level display flashes to 699 FT 11 15/16 IN Volume display flashes 9999999 if overrange, -999999 if underrange.
  • Programming Method: Four SafeTouch through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
  • Noise Filter: Programmable low (LO), medium (MED), high (HI), or off (OFF)
  • Recalibration: Recalibration is recommended at least every 12 months.
  • Password: Programmable password restricts modification of settings.
  • Nonvolatile 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
  • Environmental: Operating temperature range: -40 to 75°C
  • Storage temperature range: -40 to 75°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. 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


  • Accuracy: ±0.03% of calibrated span ±1 count
  • Input Range: 3 to 24 mA
  • Multi-Point Linearization: 2 to 32 points each for level and volume
  • Temperature Drift: 50 PPM/°C from -40 to 75 °C ambient
    Calibration Range:
  • Input Range: 4-20 mA, Input 1 & 2 Minimum Span: 0.10 mA
  • Maximum Voltage Drop: Without Backlight or with Externally-Powered
    (DC Powered) Backlight: 3.0 VDC @ 20 mA
  • With Loop-Powered Backlight: 6.0 VDC @ 20 mA
  • 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

  • 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, AEx d 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
  • 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
  • IECEx: Ex d IIC T6 Gb Ex tb IIIC T85°C Db IP68
    Ta = -40 to 75°C
    Certificate number: IECEx SIR 10.0056X


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