DM-634C Oxygen Sensor Assembly
DM-634C O2 Sensor Instruction Manual Rev. .066
Page 9 of 25
NOTE:
If a voltage signal output is desired in place of the 4-20mA output, a 1/4 watt
resistor must be installed in position R1 of the terminal board. A 250
Ω resistor will
provide a 1-5V output (– to mA). A 100
Ω resistor will provide a .4-2V output, etc. This
linear signal corresponds to 0-100% of scale (see Figure 8).
e)
Pro
gram the alarms via the gold plated jumper tab positions located on the CPU board (see
Figure 9). Alarm 1 and Alarm 2 have three jumper programmable functions: latching/non-
latching relays, normally energized/normally de-energized relays, and ascending/descending
alarm set points.
The fault alarm has two jumper programmable functions: latching/non-latching relay, and normally
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.
5.5"
6.1"
5.825"
7.92"
2"
0.5"
4.65"
W
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r ot
her
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ou
nti
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ac
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Splash Guard
O2 Sensor
Cal Port
1/4" Mounting holes
8-32 tapped
ground point
3/4" NPT Ports
Figure 7
Typical Outline and Mounting Dimensions
