Canadian Standards Association European Conformity

The PD662 NEMA 4X, CSA Certified loop-powered meter is perfect for applications where a simple, inexpensive display is required, and AC power is not available. The PD662 derives all its power from the 4-20 mA loop, including its optional backlight feature. It can be easily scaled in the field using four push buttons; with or without applying an actual calibration signal. The PD662’s display will read up to 2999; we call this 3½+ digits! The PD662 is housed in a rugged NEMA 4X enclosure and is provided with one ½" NPT pipe conduit hole.


  • NEMA 4X, IP66 Loop-Powered Field-Mount Process Meter
  • 4-20 mA Input
  • 1.7 Volt Drop (3.7 Volt Drop with Backlight)
  • 0.6" (15.2 mm) 3½+ Digits LCD Display; -1999 to 2999
  • HART® Protocol Transparent
  • Loop-Powered Backlight
  • CSA Certified 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
  • Conformal Coated PCBs for Dust and Humidity Protection
  • One ½" Conduit Hole in Enclosure
  • Pipe & Panel Mounting Kits Available
  • Stainless Steel Tag Available
  • 3-Year Warranty

Why Use Loop-Powered Meters?

The most basic decision a user wishing to display a 4-20 mA signal on a digital display has to make is: should the meter be powered by line voltage or should it be powered by the 4-20 mA loop?

There are three main benefits of using loop-powered devices:

  • No additional power required
  • Easy wiring
  • Additional digital displays can easily be added in the same loop

The following diagram illustrates how a loop-powered meter is wired. Notice there are only two connections made to the meter.

Loop-Powered Connections

For more information on loop-powered meters, check out Fundamentals of Loop-Powered Devices and Loop-Powered vs Line-Powered Meters white papers.


Display: 0.6" (15.2 mm) LCD, 3½+ digits; -1999 to 2999
Display Update Rate: 2 Updates/Second
Backlight: White; Loop-powered. Backlight can be enabled or disabled via alternative wiring of terminal block. Loop-powered backlight brightness will increase as the input signal current increases.
Display Overrange: Display Flashes 2999
Display Underrange: Display Flashes -1999
Programming Method: 4 Front Panel Pushbuttons
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 for CSA Certification: -40 to 75°C.
Functional Temperature Range: -40 to 85°C.
Storage Temp.: -40 to 85°C.
Relative Humidity: 0 to 90% non-condensing.
Printed circuit boards are conformally coated.
Connections: Removable screw terminals accept 12 to 22 AWG
Enclosure: Impact-resistant polyester plastic, body gray, cover clear with blue faceplate; NEMA 4X, IP66; ½" conduit hole provided at base
Mounting: ½" NPT pipe (0.865 in, 12.7 mm) conduit hole on bottom of enclosure. 0.166 in (4.2 mm) wall mounting holes located behind front cover screws.
Tightening Torque: Screw terminal connectors: 4.5 lb-in (0.5 Nm)
Overall Dimensions: 4.33" x 3.15" x 2.76" (110 mm x 80 mm x 70 mm) (W x H x D)
Weight: 10.4 oz (295 g)
Warranty: 3 years parts & labor. See Warranty Information and Terms & Conditions for complete details.


Input: 4-20 mA
Accuracy: ±1 count
Maximum Voltage Drop & Equivalent Resistance:
Without BacklightWith Loop-Powered Backlight
1.7 VDC @ 20 mA3.7 VDC @ 20 mA
85 Ω @ 20 mA185 Ω @ 20 mA
Function:Linear (2 to 32 points) or square root
Temperature Drift: 50 PPM/°C from -40 to 85°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 Range:Minimum Span Input 1 & Input 2
4-20 mA0.40 mA
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 com-municator is connected to the loop. The meter does not display secondary HART variables

CSA Certification

CSA Certified: U.S. & Canada. 2252 05 — Process Control Equipment.
2252 85 — Process Control Equipment,
U.S. Standards.
CSA File Number: 2282691
CSA Applicable Requirements: CAN/CSA C22.2 No. 61010-1-04 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements
UL 61010-1 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements.



The two wire power/signal connection is made on the back of the PD662 on the three position removable terminal block. Follow instructions printed on the unit for two wire loop-powered connections with or without backlight.

PD662 Input Connections with Backlight

PD662 Input Connections without Backlight

Mounting Dimensions


Choose Your Options