Specifications

M GD-100 M anual
38 6109-9000 Rev 3
Step Bump Testing U si n g Calibration Gas Cylinders
1
Remove the enclosure lid of the gas sensor and controller
(not applicabl e to Exd Remote sensor and vent pipe model
as monitoring of voltage can be done on controller).
2
Connect the voltmeter to the channel under test between Pin
4 and Pin 2 (for single-l evel alarm units), or TP5 and TP 4 (for
dual-alarm units), to monitor sensor response.
3
Expose the sensor to gas from the cylinder by using a plastic
hose/hood to di rect gas to the sensor head.
Figure 17. Gas Cylinder and Test Hardware
NOT E: If the bump test is unsuccessful, perform a
calibration as described later in this manual.
IMPORTANT: A fter a semiconductor sensor is exposed to a
substantial gas leak, the sensor should be checked and
replaced if necessary.
Gas ampoules are convenient and inexpensive alternatives to using gas
cylinders for bump testing.