Check Response Time (T90) - Dräger X-am 2800 Technical Manual

Maintenance
X-am 2800 bump test with CC-Vision and Bump Test Station: Alarm triggered
approx. 3 s after A1 threshold exceeded, if error already present.
The bump test only starts from measuring mode. Not from a menu or similar.
Prerequisites
– The gas detector is activated for the automatic bump test with the Dräger CC-
Vision PC software.
– Measuring channels that are to be used for the automatic bump test have been
configured. All measuring channels are used here as standard.
– A suitable test gas cylinder is available, e.g. test gas cylinder (order number
68 11 130) with the following mixed gas ratios: 50 ppm CO, 15 ppm H
2.5 Vol% CH4, 18 Vol% O
WARNING
Health hazard from test gas
Breathing in of test gas can be harmful to health or lead to death.
► Do not inhale the test gas.
► Observe risks connected with the test gas, hazards notes and safety advice (see
for example safety data sheets, instructions on the testing media).
Dräger recommends a test gas concentration of <60 %LEL for CatEx sensors
and a measuring range of 0 % to 100 %LEL.
1. Prepare the Bump Test Station in accordance with the instructions provided in
the quick reference guide on the Bump Test Station.
2. Insert the switched-on gas detector into the Bump Test Station and press it down
until it locks into place.
3. The bump test starts automatically.
4. If a gas alarm (quick bump test) is triggered or the bump test concentration
entered (advanced bump test) is reached within the given time, OK is shown for
the corresponding gas channel.
5. Remove the gas detector from the Bump Test Station.
6. If the concentrations have fallen below the A1 alarm thresholds, the gas detector
automatically switches back to measuring mode after 10 s.
Further steps
If the current measured values do not reach the target concentration ("Advanced
bump test" only) set during the bump test, an error is triggered.
In this case, repeat the bump test or calibrate the gas detector.
6.6

Check response time (t90)

The test can also take place in calibration mode in which case the values are not
displaced by alarms. If necessary, the values can subsequently be discarded, if the
gas detector already has a valid calibration.
1. Carry out a bump test and conduct a simplified check of the response time.
22
(other test gas cylinders can be added on request)
2
appears.
Technical manual
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X-am 2800