Det-Tronics R8471J Single Channel Gas Controller, OPECL - Manual (Page 7)

1.1 95-8572 5
MoDel PIrtB terMInatIon Box
The Model PIRTB Termination Box allows the operator
to initiate calibration of the OPECL detector from a
remote location. The PIRTB provides a magnetic reed
switch for initiating calibration and an LED to provide
calibration feedback. Refer to Figure 7 for an illustration
of an R8471J Controller wired to an OPECL IR gas
detector using a Model PIRTB termination box. Refer
to Figure 8 for location of the magnetic switch and LED
within the PIRTB enclosure.
100K
oPen collector oUtPUt
1n4004
tYPIcal
+32 vDc MaxIMUM
C1289
Figure 6—Open Collector Output with Inductive Load
and Transient Suppression Device
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SP.
CAL
SIG
RET
+ 24
CAL
SIG
RET
+ 24
+
–
24 VDC
POWER SUPPLY
NOTES:
1. REED SWITCH, LED, AND ALL INTERNAL CONNECTIONS ARE PROVIDED ON
THE PIRTB CONNECTOR BOARD.
2. CONDUCT OPECL CALIBRATION PROCEDURE BEFORE
R8471J CONTROLLER CALIBRATION.
3. OPECL CALIBRATION INITIATION WILL CAUSE R8471J FAULT
CONDITION UNTIL OPECL CALIBRATION PROCEDURE IS COMPLETED.
4. CABLE SHIELD WIRE IS TO BE CUT BACK AND TAPED OFF WITHIN
PIRTB JUNCTION BOX.
5. CABLE SHIELD WIRE IS TO BE CONNECTED TO TERMINAL NO. 3 AT R8471J
BACKPLATE, WHICH IS THE CONTROLLER EARTH GROUND CONNECTION.
MAGNETIC REED SWITCH
FOR OPECL
CALIBRATION COMMAND
A2414
–24 VDC
+24 VDC
– 4-20 MA
CALIBRATE
1
2
3
4
5
6
7
8
9
10
11
12
13
MODEL OPECL
GAS DETECTOR
R8471J
CONTROLLER
+ 4-20 MA
–24 VDC
+24 VDC
2
1
NOTES:
1 INTERNAL JUMPER REQUIRED
FOR NON-ISOLATED CURRENT
OUTPUT (SINGLE POWER
SUPPLY).
2 250 OHM RESISTOR REQUIRED.
Figure 7—R8471J Controller Wired to an OPECL IR Detector with a Model PIRTB Termination Box