PRECISION DIGITAL PD677 User manual

4½ DIGIT LOOP-POWERED METERS
Precision Digital corPoration
www.predig.com
Model PD675 NEMA 4X
Model PD677 Explosion-Proof
PD675
•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
PD677
•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
®
®

4½ DIGIT LOOP-POWERED METERS
2
WARNING: If any of the following operations are performed in
hazardous areas, all appropriate hazardous area procedures must
be followed.
WARNING: Disconnect from supply before opening.
Keep cover tight while circuits are alive. Conduit seals must be
installed within 18″ of the enclosure (PD677).
AVERTISSEMENT: Ouvrir le circuit avant D’enlevel le couvercle
garder le couvercle bien fermé tant que les circuits sont sous
tension. Un scellement doit êntre installe à moins de 450 mm du
boîtier (PD677).
WARNING: Calibration of the Loop-Powered Display should be
performed in a non-hazardous area prior to installing it in its
enclosure.
CAUTION: Care should be taken to avoid static electricity damaging
the electronic circuitry.
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.
Display Faceplate
Display Board
Signal
Input Board
Pollution Degree 2
Installation Category II
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.
J1
Input
4-20 mA
Transmitter Loop Power
Supply
n
Figure 2. Signal Input Connections
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 Procedure
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
JP2 JP3
JP1
1
2
3
4
Cable
1999.9
F-HI-C C-LO-FR24
Figure 3. Display Board
Balance Potentiometer (R24) is preset at the factory
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
JP1
1
2
3
4

4½ DIGIT LOOP-POWERED METERS
3
MOUNTING KIT OPTIONS
PD675 Panel Mount
PDA6844 Panel Mounting Kit
PD675 & PD677 Pipe Mount
PDA6845 Pipe Mounting Kit
8.20 (208)
Units: Inch (mm)
Mounting Plate Hole Pattern
DIMENSIONS Units: Inch (mm)
PD675
Wall
Mounting
Holes
Beneath
Cover
Screws
E
F
D
AC
B
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
D
C
B
A
0.31
(7.9)
Dia.
A: 5.44 (138) C: 5.63 (143)
B: 4.06 (103) D: 5.63 (143)
1
2
MOUNTING PLATE
PANEL
METER
BRACKET
WASHERS
SELF
TAPPING
SCREW
3

4½ DIGIT LOOP-POWERED METERS
www.predig.com
Precision Digital corPoration
19 Strathmore Road • Natick MA • 01760 • USA • Tel: [phone] • Fax: [phone]
LIM673-678_E 01/07
ORDERING INFORMATION
Model Description
PD675-N NEMA 4X Loop-Powered Meter
PD677-N Explosion-Proof Loop-Powered Meter
PD677-N-EX FM Approved & CSA Certified Exp-Proof Meter
Accessories
PDA6844 Panel Mounting Kit for PD675
(PDA6844 does not provide NEMA 4X seal to the panel)
PDA6845 2" Pipe Mounting Kit for PD675, PD677
PDA6845-SS 2" Pipe Mounting Kit SS for PD675, PD677
PDA-SSTAG Stainless Steel Tag
SERVICES ORDERING INFORMATION
Calibration
PDN-CAL Calibration with Certificate
PDN-CALDATA Calibration with Certificate & Data
PDN-LTCAL LifetimeAnnual Recertification (shippedbacksameday)
PDN-LTCAL2 Lifetime Annual Recertification (shippedbacknextday)
PDN-LTCAL5 LifetimeAnnual Recertification (shippedbackwithin5days)
PDN-ONEDAYRTN One-Day Turnaround Service
Certificate of Conformance
PDN-CERTCON Certificate of Conformance
Extended Warranty
PDN-EXTWRNTY1-0 1 Year with a list price between: $0-$299
PDN-EXTWRNTY1-1 1 Year with a list price between: $300-$599
PDN-EXTWRNTY2-0 2 Years with a list price between: $0-$299
PDN-EXTWRNTY2-1 2 Years with a list price between: $300-$599
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
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; dust-
ignition 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 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.
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