15
95-8556
2.1
24 VDC
+
–
24 VDC
+
–
–24 VDC
–24 VDC
+24 VDC
+24 VDC
CALIBRATE
+ 4-20 MA
– 4-20 MA
RS-485 A
RS-485 B
RELAY POWER
FAULT
LOW ALARM
HIGH ALARM
1
2
3
4
5
6
7
8
9
10
11
12
13
NO USER CONNECTION
+
–
4 to 20 MA
B2052
*
TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 600 OHMS MAXIMUM.
*
24 VDC
+
–
24 VDC
+
–
–24 VDC
–24 VDC
+24 VDC
+24 VDC
CALIBRATE
+ 4-20 MA
– 4-20 MA
RS-485 A
RS-485 B
RELAY POWER
FAULT
LOW ALARM
HIGH ALARM
1
2
3
4
5
6
7
8
9
10
11
12
13
NO USER CONNECTION
+
–
4 to 20 MA
B2053
*
TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 600 OHMS MAXIMUM.
*
Figure 14—Detector Wired for Isolated 4 to 20 ma Current Output
(Sourcing)
Figure 13—Detector Wired for Isolated 4 to 20 ma Current Output
(Sinking)
CURRENT OUTPUT
CHASSIS GROUND
POWER
SENSOR
EXTERNAL RESET
HIGH ALARM
HIGH ALARM / OC
AUX. ALARM
AUX. ALARM / OC
LOW ALARM
LOW ALARM / OC
FAULT
FAULT / OC
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
–
+
+
–
+
–
18 TO 32
VDC
POWER
SIGNAL
2
OC = OPEN COLLECTOR OUTPUT
(BASE MODEL ONLY)
A2247
–24 VDC
+24 VDC
– 4-20 MA
1
2
3
4
5
6
7
8
9
10
11
12
13
R8471J CONTROLLER
MODEL OPECL
GAS DETECTOR
+ 4-20 MA
24 VDC
–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 15— Model OPECL Receiver Wired to a Model
R8471J Controller
–24 VDC
–24 VDC
+24 VDC
+24 VDC
CALIBRATE
+ 4-20 MA
– 4-20 MA
RS-485 A
RS-485 B
RELAY POWER
FAULT
LOW ALARM
HIGH ALARM
NO USER
CONNECTION
1
2
3
4
5
6
7
8
9
10
11
12
13
A2203
24 VDC
+
–
250 TO 500 OHMS
Figure 16—Wiring the Model OPECL for Benchtop
Testing/Programming Using HART Protocol
