www.predig.com
LOW COST 3
1
/
2
DIGIT LOOP-POWERED METERS
PRECISION DIGITAL CORPORATION
C
ORPORATE
H
EADQUARTERS
19 Strathmore Road • Natick MA • 01760 • USA • Tel: (800) 343-1001 • Fax: (317) 216-1277
DECIMAL POINT SELECTION
The decimal point jumper array (JP1) is located in the upper
right corner of the display board. Place a jumper across the
bottom pins for a display of 199.9, across the middle pins for
a display of 19.99, and across the top pins for a display of
1.999.
CALIBRATION
The LO calibration control (R11) is located below the display
and the HI calibration control (R9) is located to the right of the
display.
Apply a 4 mA input signal and adjust the LO control to display
the desired reading. Next, apply a signal between 16 and 20
mA and adjust the HI control to display the desired reading.
Complete the calibration procedure by making any minor
adjustments to the LO and HI controls.
DIMENSIONS
PD660
PD661
SETUP
The only tools needed for calibration are a calibrated current
source and a screwdriver.
PD660 INSTALLATION
Installation of the PD660 involves removing the display board
and screw terminal connector. It may also be necessary to
remove the input signal board depending on type of conduit
hubs used.
PD661 INSTALLATION
The PD661 has no provisions for wall mounting. Installation
of the unit is accomplished by using the two
1
/
2
″
NPT conduit
holes provided with
1
/
2
″
NPT fittings.
DISASSEMBLY
The removable screw terminal connector is located on the
lower circuit board. To access these input terminals it is neces-
sary to remove the display board from the input signal board.
This is done by first removing the enclosure cover. Next,
loosen the 2 screws that hold the display board to the standoffs.
Rotate the display board so the right side comes off the stand-
off first, proceed to remove the display board from both stand-
offs. Be careful to avoid contact of the display with rough
surfaces. The display board may be disconnected from the rib-
bon cable simply by pulling up on the ribbon cable connector
located above the display.
Connect a 4-20 mA input signal to terminal J5 located on the
input signal board as shown below.
When reassembling the circuit boards
be careful NOT to over-tighten
the screws.
Ribbon
Cable
Connector
Display Board
Input Signal Board
Pollution Degree 2
Installation Category II
Screw
Terminal
Connector J5
+
+
+
-
-
-
Loop Power
Supply
Signal Input
Connections
S
S
4-20 mA
Transmitter
Screw Terminal Connector
Balance Control (factory adjust only)
LO Calibration
Control
HI
Calibration
Control
Decimal Point
Jumper Array
Ribbon Cable
Connector
JP1
HI
R9
R 11
LO
C
A
B
A: 4.75
″
(121 mm)
B: 3.75
″
(95 mm) C: 4.5
″
(114 mm)
Weight: 4 lbs (1.8 kg) FM and CSA certified enclosure
CAUTION-DISCONNECT FROM SUPPLY BEFORE OPENING. KEEP COVER TIGHT WHILE CIRCUITS ARE
ALIVE. CONDUIT SEALS MUST BE INSTALLED WITHIN 18
″
OF THE ENCLOSURE.
ATTENTION-OUVRIR LE CIRCUIT AVANT D’ENLEVEL LE COUVERCLE GARDER LE COUVERCLE BIEN
FERME TANT QUE LES CIRCUITS SONT SOUS TENSION. UN SCELLEMENT DOIT ETRE INSTALLE A
MOINS DE 450 mm DU BOITIER.
CONNECTIONS
TOP VIEW
END VIEW
Wall
Mounting
Holes
Beneath
Cover
Screws
D
A
C
E
F
B
A: 3.15
″
(80 mm)
C: 2.36
″
(60 mm)
E: 2.56
″
(65 mm)
B: 4.33
″
(110 mm)
D: 3.54
″
(90 mm)
F: 0.79
″
(20 mm)
Weight: 12 oz (340 g)
LIM660-661 Rev C 06/00
