Detcon DM-634 - Manual (Page 9)

energized/normally de-energized relay. The default settings of the alarms (jumpers removed) are normally de-
energized relays, non-latching relays, and alarm points that activate during descending gas conditions.
Detcon Model DM-634 Oxygen Sensor PG.9
4 3/4"
3/4" NPT
1/4" Dia.
Mounting Holes
7 1/2"
6 1/8"
5 1/2"
3/4" NPT
Rain
Shield
2"
2 1/8"
Figure #2
NC
ALARM 1
W
H
T
B
L
K
Y
E
L
B
LU
MA
VDC Power In
NO
NC
NO
NC
NO
N
O
/N
C
C
O
M
N
O
/N
C
C
O
M
N
O
/N
C
C
O
M
FAULT ALM-2 ALM-1
Alarm Dry Contacts
ALARM 2
FAULT
R1
A
B
A
B
4-20 mA Output
RS-485 In
RS-485 Out
Optional Voltage
Developing Resistor
Use 250 ohm 1/4w
JUMPERS
UN-USED
Jumper Programmable Alarm Outputs
Normally Open or Normally Closed
Sensor
Place un-used alarm programming
jumper tabs here
Figure #3