Figure #4, Figure #5 – Detcon DM-634 User Manual
Page 10
If a jumper tab is installed in the latch position, that alarm relay will be in the latching mode. The latching mode
will latch the alarm after alarm conditions have cleared until the alarm reset function is activated. The non-latching
mode (jumper removed) will allow alarms to de-activate automatically once alarm conditions have cleared.
If a jumper tab is installed in the energize position, that alarm relay will be in the energized mode. The energized
mode will energize or activate the alarm relay when there is no alarm condition and de-energize or de-activate
the alarm relay when there is an alarm condition. The de-energized mode (jumper removed) will energize or acti-
vate the alarm relay during an alarm condition and de-energize or de-activate the alarm relay when there is no
alarm condition.
If a jumper tab is installed in the ascending position, that alarm relay will be in the ascending mode. The ascend-
ing mode will cause an alarm to f ire when the gas concentration detected is greater than or equal to the alarm
set point. The descending mode (jumper removed) will cause an alarm to f ire when the gas concentration detect-
ed is lesser than or equal to the alarm set point. Except in special applications, O2 gas monitoring will require
alarms to f ire in
“DESCENDING” gas conditions.
Any unused jumper tabs should be stored on the connector board on the terminal strip labeled “Unused
Jumpers” (see f igure 3).
f)
If applicable, set the RS-485 ID number via the two rotary dip switches located on the pre-amp board (see f ig-
ure 5). There are 256 different ID numbers available which are based on the hexadecimal numbering system. If
RS-485 communications are used, each sensor must have its own unique ID number. Use a jewelers screwdriver
to set the rotary dip switches according to the table listed on the following page. If RS-485 communications are
not used, leave the dip switches in the default position which is zero/zero (0)-(0).
Detcon Model DM-634 Oxygen Sensor PG.10
FAULT
ALARM 1
Latch
Energize
Latch
Ascending
Energize
A
LA
R
M
2
La
tc
h
A
sc
en
di
ng
E
ne
rg
iz
e
CPU Board - Top View
Alarm Programming Jumpers
Control Circuit - Side View
CPU Board
Figure #4
Preamp Board - Side View
RS-485 ID Set Dip Switches
Control Circuit - Side View
Preamp Board
0 12
3
4
5
6
78
9A
B
C
D
E
F
0 12
3
4
5
6
78
9A
B
C
D
E
F
SW2
SW1
Figure #5