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FM Approvals Canadian Standards Association Atmosphères ExplosiblesEuropean Conformity

The PD663 is a loop-powered field meter that is FM Approved and CSA Certified as Explosion-Proof, Dust-Ignition Proof, and Flame-Proof, and ATEX & IECEx Certified as Flame-Proof and Protection by Enclosure. The PD663 is easy to install and program and it can be seen in a variety of lighting conditions and even in bright sunlight. The fact that this meter is loop-powered means that there is no need to run additional, costly power lines into a hazardous area. The meter gets all of the power it needs from the 4-20 mA loop and its 1.7 V drop results in a minimal burden on the loop. The meter features a wide -40 to 75°C operating temperature range and comes with two 1/2" NPT threaded conduit openings and flanges for wall or pipe mounting. Calibration is a quick process involving the four internal push buttons. The PD663’s display will read up to 2999; we call this 3½+ digits!


  • Fully-Approved Explosion-Proof Loop-Powered Meter
  • 4-20 mA Input with ±0.05% Accuracy of Calibrated Span
  • 1.7 Volt Drop (4.7 Volt Drop with Backlight)
  • Easy Field Scaling in Engineering Units without a Calibrator
  • 0.6" (15.2 mm) 3½+ Digits LCD Display; -1999 to 2999
  • Display Mountable at 0°, 90°, 180°, & 270°
  • HART® Protocol Transparent
  • Loop-Powered Backlight Option
  • Operating Temperature Range: -40 to 75°C (-40 to 167°F)
  • Four Internal Buttons for Easy Field Scaling
  • Max/Min Display
  • Programmable Noise Filter
  • 32-Point Linearization & Square Root Extraction
  • FM Approved as Explosion-Proof / Dust-Ignition Proof / Flame-Proof
  • CSA Certified as Explosion-Proof / Dust-Ignition Proof / Flame-Proof
  • ATEX and IECEx Certified as Flame-Proof and Protection by Enclosure
  • Conformal Coated PCBs for Dust and Humidity Protection
  • Flanges for Wall or Pipe Mounting
  • Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum Enclosure
  • Two ½" NPT Threaded Conduit Openings (One Plug Installed)
  • 1.5" U-Bolt Kit & 2" Pipe Mounting Kits Available
  • Stainless Steel Tag Available
  • 3-Year Warranty


The PD663 comes calibrated and scaled at the factory to display a 4.00 to 20.00 mA signal on startup. To change the scaling, follow along using the 4 button interface.

PD663 Programming Buttons

Electronics Module

The PD663 electronics module is housed in a plastic enclosure that provides a degree of environmental protection for the electronics circuitry. The module is mounted to the enclosure with spring-loaded thumbscrews and can be oriented in 0°, 90°, 180°, or 270° increments. Connections are made to a removable screw terminal block.

PD663 Electronics Modeule


Display: 0.6" (15.2 mm) LCD, 3½+ digits; -1999 to 2999
Display Update Rate: 2 updates/second
Display Orientation: Display may be mounted at 90° increments up to 270° from default orientation.
Overrange: Display Flashes 2999
Underrange: Display Flashes -1999
Programming Method: 4 Internal pushbuttons (behind glass).
Noise Filter: Programmable HI, LOW, 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.
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
Environmental: Operating temperature range: -40 to 75°C
Storage Temperature: <-40 to 75°C
Relative Humidity: 0 to 90% non-condensing.
Printed circuit boards are conformally coated.
Connections: Removable screw terminals accept 12 to 22 AWG wire
Enclosure: Explosion-proof cast aluminum with glass window, 0.30% max copper content, corrosion resistant epoxy coating, color: blue. NEMA 4X, 7, & 9, IP68.
Two ½" NPT threaded conduit openings.
One ½" NPT nickel plated brass conduit plug with 10 mm hex key fitting installed.
Mounting: May be mounted directly to conduit. Two mounting holes for 1.5" pipe or wall mounting.
Tightening Torque: Screw terminal electrical connectors: 4.5 lb-in (0.5 Nm)
Overall Dimensions: 4.84" x 4.29" x 3.62" (123 mm x 109 mm x 92 mm) (W x H x D)
Weight: 2.45 lbs (40 oz, 1.13 kg)
Warranty: 3 years parts and labor. See Warranty Information and Terms & Conditions on for complete details.


Input: 4-20 mA
Accuracy: ±.05% of calibrated span ±1 count
Function:Linear (2 to 32 points) or square root
Temperature Drift: 50 PPM/°C from -40 to 75°C ambient
Decimal Point: User selectable decimal point
Minimum Span: Input 1 & Input 2: 0.40 mA
Calibration Range: An Error message will appear if input 1 and input 2 signals are too close together.

Input RangeMinimum Span Input 1 & Input 2
4-20 mA0.40 mA
Maximum Voltage Drop & Equivalent Resistance:

Without BacklightWith Backlight
1.7 VDC @ 20 mA4.7 VDC @ 20 mA
85 Ω @ 20 mA235 Ω @ 20 mA
Loop-Powered Backlight Option: Factory installed only. Powered directly from the 4-20 mA loop, no batteries required. Backlight can be enabled or disabled via alternative wiring of terminal block. The display brightness will increase as the input signal current increases.
Input Overload: Over current protection to 2 A max.
HART Transparency: The 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.

Product Ratings & Approvals

FM: 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:
Class I, Zone 1, AEx d Group IIC; T6
Protection by Enclosure:
Zone 21, AEx tb IIIC; T85°C
Ta = -40 to 75°C.
Enclosure: Type 4X, IP66.
Certificate number: 3040391
CSA: 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 = -40 to 75°C.
Enclosure: Type 4X & IP66/IP68.
Certificate number: 2325749
ATEX: II 2 G D. Flame-proof for use in:
Zone 1, Ex d IIC T6 Gb
Protection by Enclosure for use in:
Dust Atmospheres (Zone 21)
Ex tb IIIC T85°C Db IP68.
Ta = -40°C to +75°C
Certificate number: Sira 10ATEX1116X
IECEx: Flame-proof for use in:
Zone 1, Ex d IIC T6 Gb
Protection by Enclosure for use in:
Dust Atmospheres (Zone 21)
Ex tb IIIC T85°C Db IP68.
Ta = -40°C to +75°C
Certificate number: IECEx SIR 10.0056X


PD663 Input Connections with Backlight

PD663 Input Connections without Backlight



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