Important:
After a semiconductor sensor is exposed to a substantial gas leak, the sensor should be
zero calibrated and bump tested and replaced if necessary.
Note:
Because the transportation of gas ampoules and cylinders gas is regulated by many
governments throughout the world, is suggested to source them from local dealers.
Steps for bump testing using calibration gas cylinders
1. Remove the enclosure lid of the gas detector (not in an exhaust area).
2. Connect the handheld service tool and monitor response.
3. Expose the sensor to gas from the cylinder. Use a plastic hose/hood to direct gas to the sensor
head. If the sensor shows readings in response to the gas and the detector goes into alarm, then
that instrument is good to go.
Note
: Gas ampoules are not valid for calibration or accuracy checks of the sensor. These require actual
gas calibration, not bump testing with ampoules.
For bump tested expose the sensors to test gas (R134A, CO2, etc.). The gas should put the system into
alarm.
The purpose of this check is to confirm that gas can get to the sensor(s) and that all the alarms present
are functional.
For bump test can be used Gas Cylinder or Gas Ampoules (see Fig. 1 and 2).
Fig. 1: Gas cylinder and test hardware
Fig. 2: Gas ampoules for bump testing
Danf
os
s
80Z687
Flow regulator typical
flow 0.3 L/min
Outlet 5/8" 18 UNF (C10)
Flexible non-absorbant tubing
Vented calibration hood
Cylinder
360 mm high x 88 mm diameter x 440 mm high
with flow regulator 110 L capacity of calibration gas.
Weight 1.4 kg
Danf
os
s
80Z68
6
2. Bump testing
Danf
os
s
148D24
Test beaker
(M42 thread)
Gas ampoules
M35 adapter
Sensor
adapter
Operating Guide | DGS functional tests and calibration procedure
© Danfoss | Climate Solutions | 2022.10
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