Precision Digital ISO 9001:2000 Certified Quality System

Key Features	Setup	Disassembly	Connections

Calibration	Specifications	Ordering Information	Documentation

LOOP-POWERED NEMA 4X METER

Model PD675 NEMA 4X	Model PD677 Explosion-Proof

4½ Digit 0.7" (17.8 mm) LCD, 19999 FM Approved & CSA Certified Impact-resistant polycarbonate body Operates from -20 to 65°C Easy to Calibrate Note: For complete installation information see instruction manuals below	4½ Digit 0.7" (17.8 mm) LCD, 19999 PD677-N-EX is FM Approved & CSA Certified Ex-proof, cast aluminum with glass window Operates from -20 to 65°C Easy to Calibrate

Use these 4-1/2 digit Loop-powered meters to display numbers up to 19,999 with 1 count resolution. That is, they will display numbers like 7124, 15697 or 124.78 as "whole numbers" -- no dummy zeroes or multipliers needed! These new meters are also available in 3 enclosure types: Panel mount, NEMA 4X, and Explosion-proof so they can be located almost anywhere in the plant. Options include open collector high-level-alarm output and square root extraction. The PD675-N and PD677 have been FM and CSA Certified approved as explosion-proof as complete products- not just the enclosures.

Setup

The only tools needed for calibration are a calibrated current source, a flat head screwdriver & a phillips head screwdriver. Please note that the meter must be disassembled in order to perform the setup functions.

Disassembly

The calibration controls are located behind the display faceplate. To access these controls, you must first remove the enclosure cover and faceplate by doing the following:

PD675: Loosen the four screws on the enclosure cover and remove. Unscrew the two fasteners that hold the faceplate, then remove.

PD677: Turn the enclosure cover counterclockwise to remove. Unscrew
the two fasteners that hold the faceplate, then remove.

Figure 1. PD677 Assembly

Note: When reassembling boards DO NOT over-tighten screws.

Connections

Field connections are made to the screw terminals located on the Signal Input Board. To access these screw terminals it is necessary to remove the Display Board from the Signal Input Board. First, disconnect the ribbon cable connector from the Display Board. Next, remove the two screws located to the left and right of the LCD that hold the Display Board in place. Finally, remove the Display Board carefully to avoid contact with any rough surfaces.

Figure 2. Signal Input Connections

Decimal Point Selection

Decimal point selection is accomplished using JP1 located behind the faceplate to the right of the display. Leave jumper on one pin only for a display of 19999 (default), place the jumper over both pins of #1 for a display of 1999.9, #2 for 199.99, #3 for 19.999, #4 for 1.9999

Calibration Controls

Calibration of these meters is a two-step process involving four controls. These controls are located on the Display Board. The LO controls are on the right and the HI controls on the left. The pre-configured jumper array
JP2 and JP3 are also located on the Display Board.

Calibration Procedures

Connect the 4-20 mA input signal. Apply 4 mA to the input and adjust the coarse and fine LO controls for the desired reading. Next apply a signal between 16 and 20 mA and adjust the coarse and fine HI controls for the desired reading. Complete the calibration by making any minor adjustments to the LO and HI displays.

Jumper positions

Figure 3. Display Board
Balance Potentiometer (R24) is preset at the factory

Mounting Kits

PD675 Panel Mount

PDA6844 Panel Mounting Kit

PD675-677 Pipe Mounting Kits

PDA6845 Pipe Mounting Kit

Mounting Plate Hole Pattern

Mounting

PD675

A: 3.15 (80)	E: 2.56 (65)
B: 5.51 (140)	F: 0.79 (20)
C: 2.36 (60)
D: 4.72 (120)

PD677

A: 5.44 (138)	B: 5.63 (143)
C: 4.06 (103)	D: 5.63 (143)

Specifications

General
Input: 4-20 mA @ 24 VDC maximum
Accuracy: ±0.05% FS ±2 counts
Decimal Point: User selectable
Calibration Range: 4 mA input: -5000 to +5000;
20 mA input: between 200 and 20000 above 4 mA input
Maximum Voltage Drop: 5.2 VDC @ 20 mA
Display Update Rate: 2.5/second
Operating Temperature: -20 to 65°C
Storage Temperature: -40 to 80°C
Relative Humidity: 0 to 90% non-condensing
Connections: Removable screw terminals accept 12 to 22 AWG
Warranty: 2 years parts & labor
Extended Warranty: 1 or 2 years, refer to Price List for details.

PD675
Display: 0.7" (17.8 mm) LCD, 4½ digits; 19999
Approvals: FM Approved & CSA Certified as non-incendive for Class I, Division 2, Groups A, B, C, & D; suitable for Class II, Division 2, Groups F & G; suitable for Class III, Division 2, indoor and outdoor, hazardous (classified) NEMA 4X locations.
Enclosure: Impact-resistant polycarbonate body, color: gray; clear polycarbonate cover; NEMA 4X, IP67. ½" conduit hole provided at base.
Weight: 12 oz (340 g)

PD677
Display: 0.7" (17.8 mm) LCD, 4½ digits; 19999
Approvals: The PD677-N-EX is FM Approved & CSA Certified as explosion-proof for Class I, Division 1, Groups B, C, & D; dustignition proof for Class II, Division 1, Groups E, F, & G, Class III hazardous (classified) locations.
Enclosure: Explosion-proof, cast aluminum with glass window, 0.3% max copper content, corrosion resistant polyester powder coating, color: safety blue. NEMA 4X, 7, & 9, IP66; FM Approved & UL/C-UL Certified: Class I, Division 1, Groups B, C, & D, Class II, Groups E, F, & G, Class III; Class I, Zone 1 AEx d IIC hazardous outdoor (Type 4X) locations. IEC rating: Ex d IIC IEC 60529 IP66. Two ¾" NPT holes provided.
Weight: 5.7 lb (2.6 kg)

Disclaimer

The Information contained in this document is subject to change without notice. Precision Digital Corporation makes no representations or warranties with respect to the contents hereof, and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.

ORDERING INFORMATION Products
Model	Description	Price
PD675-N	FM Approved & CSA Certified Loop-Powered NEMA 4X Meter	$369.00
PD677-N	Explosion-Proof Loop-Powered Meter	$569.00
PD677-N-EX	FM Approved & CSA Certified Explosion-Proof Loop-Powered Meter	$619.00

Accessories
Model	Description	Price
PDA6845	Zinc Plated Pipe Mounting Kit with 2 Holes	$49.00
PDA6845-SS	Stainless Steel Pipe Mounting Kit with 2 Holes	$79.00
PDA-SSTAG	Stainless Steel Tag	$25.00
PDA6844	Panel Mounting Kit for PD675, PD685, PD686 and PD697	$49.00

Documentation
The documentation can be downloaded from these links:

PD675-677: Instruction Manual

Mounting Kits for Precision Digital Meters

Setup and Calibration Services Order Form

Stainless Steel Tag Order Form

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