Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 17)

15 95-8556 10.1
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
B2051
* TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 600 OHMS MAXIMUM.
*
Figure 13—Detector Wired for Non-Isolated 4 to 20 ma Current
Output (Sourcing)
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
B2050
* TOTAL LOOP RESISTANCE = 250 OHMS MINIMUM, 600 OHMS MAXIMUM.
*
Figure 12—Detector Wired for Non-Isolated 4 to 20 ma Current
Output (Sinking)
–24 VDC
–24 VDC
+24 VDC
+24 VDC
CALIBRATE
+ 4-20 MA
– 4-20 MA
RS-485 A
RS-485 B
RELAY POWER (RED)
FAULT (ORANGE)
LOW ALARM (WHITE)
HIGH ALARM (YELLOW)
LOW ALARM
RELAY
HIGH ALARM
RELAY
FAULT
RELAY
WIRING TO OPTIONAL
RELAY BOARD
NO USER CONNECTION
RELAY BOARD TERMINALS
(OPTIONAL)
1
2
3
4
5
6
7
8
9
10
11
12
13
B2054
NO
NC
C
NO
NC
C
NO
NC
C
Figure 11—Wiring Terminal Identification for OPECL Receiver
with Relays