Detcon 971-041170-00K - Manual (Page 4)

Caution: Observe correct polarity when terminating all input/output wiring. Failure to do so may result in circuit dam-
age on power up. See the field wiring diagram below for terminal locations.
4. Connect 117VAC to the connector labeled “117VAC IN”.
5. If applicable, connect 24 VDC battery backup to the connector labeled “24 VDC IN”.
6. If applicable, connect a remote recording device, or computer to the 4-20 mA signal output connector. The terminals
are labeled SENSOR “–” and “mA”.
7. If applicable, connect alarm devices. Discrete alarm relay contacts are provided for three alarms: Fault, Low and
High. The contacts consist of common and choice of normally open or normally closed. Contact output selections are
jumper programmable on the sensor connector board. See the sensor manual for contact ratings and other information.
8. If applicable, connect flow fault alarm wiring. Two sets of form C contacts (common, normally open and normally
closed) are provided. Relay contacts are rated 1 amp at 30VDC/.24 amp at 125VDC.
1.2 START UP
Upon completion of all tubing connections and field wiring turn on the power switch located on the enclosure door.
Note that the power lamp illuminates. If applicable, note that the sensor LCD indicators activate. Varying readings may
occur during sensor warm-up. Allow approximately 1 hour to stabilize (24 hours is best).
Also note air flow through the flow meter. Adjust the flow meter as necessary so that it falls between 500 and 1000
ml/m (milli liters per minute). The normal configuration of the flow valves should be: “CAL IN” closed (horizontal
position); “SAMPLE VALVE” open (vertical position).
Detcon Model 971-041170-00K Gas Detection System PG.4
P7 P8 P6 P5
L1 L2 GND
mA C NO/NC C NO/NC C NO/NC
117 VAC
IN
24 VDC
IN
Battery
Backup
SENSOR #1 FAULT
ALARM CONTACTS #1
ALARM 1 ALARM 2
ALARM DRY
CONTACTS
C
O
M
N
O
/N
C
C
O
M
C
O
M
N
O
/N
C
N
O
/N
C
FLT ALM 1 ALM 2
Flow
Fault
Circuit
COM
NO
NC
1
COM
NO
NC
2
COM
NO
NC
3
PT1
mA
4-20mA
Wire alarms and the 4-20mA output
signal to the plug-type connectors.
Wire 117 VAC & optional 24 VDC
backup to the lugless connectors.
Two discreet form C dry contacts
are provided (2 & 3) by the flow
fault circuit for alarm devices. The
first set of contacts (1) are
prewired to interrupt the 4-20mA
signal output in the event of a
flow fault. This will allow for flow
fault monitoring at any
controller/computer that the signal
is wired in to.
FLOW
FAULT
CONTACTS