Specifications

M GD-100 M anual
6109-9000 Rev 3 37
Step Electrical Re set of Two-Alarm Systems
1
For the sens or standby voltage, connect a DC voltmeter
between TP 5 (0V ) and TP 4 (+V) as shown in Figure 14 and
Figure 16. Adjust pot RV1.
2
For low-l evel alarm volt age, connect your DC voltmeter
between TP 5 (0V ) and TP 2 (+V) as shown in Figure 14 and
Figure 16. Adjust pot P8.
3
For hi gh-level alarm voltage, connect your DC voltmeter
between TP 5 (0V ) and TP 1 (+V) as shown in Figure 14 and
Figure 16. Adjust pot P7.
6.4. Bump Testing
After installation the units should be bump tested. Expose the sensors to
test gas ampoul es (NH
3
, CO
2
, etc.) or test cylinder (appropri ate to the
installation). The gas is heavier than ai r and should fall into the s ensor,
putting the system into alarm and lighting the red LED. The delay will
prevent the audible alarm from sounding or the relay from switching (if a
delay is set).
With a bump test you can see the functions of the sensor - the yellow/red
LED will light, and the relay and audible alarm will function.
Ideally bump tests are conducted on site in a clean air atmosphere.
NOT E: Prior to carrying out a bump test, check and adjust
the zero setting as described in the Calibration section.
NOT E: Procedures for bump test and calibration vary
depending on the sensor technology used and the gas in
question. The MGD-100 is available in two sensor versions:
Semiconductor (SC) and Infrared (IR).
NOT E: Do not pressurize the sensor.
NOT E: For semiconductor s ensors, you MUS T use
calibration gas in a balance of air (not N
2
).