Checking The Response Time (T90) - Dräger X-am 3500 Manual Del Usuario

en Maintenance
Dräger recommends a test gas concentration of
<60 %LEL for CatEx sensors and a measuring range of
0 % to 100 %LEL.
For bump tests with the wizard and the X-dock, the
results are saved in the device memory.
Requirements:
– A bump test can only be carried out if at least one
sensor has been configured for the bump test with
the Dräger CC-Vision PC software.
– The gas detector is switched on and warm-up phase
1 is complete.
– The thread port for the pump adapter and calibration
adapter must be clean.
– A suitable test gas cylinder is available, e.g. a test
gas cylinder (order number 68 11 130) with the
following mixed gas ratios: 50 ppm CO, 15 ppm
H S, 2,5 vol. % CH4, 18 vol. % O
2
Other test gas cylinder can be added upon request.
To perform a bump test:
1. Mount the calibration adapter to the gas detector.
Make sure that both guide pins are in the correct
grooves.
2. Connect the hose to the test gas cylinder and the
inlet on the calibration adapter.
3. If needed, connect a second hose (max. length:
2 m) to the outlet on the calibration adapter to direct
the test gas to an exhaust or outside. Make sure that
these is sufficient ventilation in room or vehicles.
4. Open the bump test (depending on the
configuration).
5. Open the valve on the test gas cylinder, the volume
6. Select
7. The bump test is complete when all measuring
2
8. Close the valves on the test gas cylinder.
9. Remove the calibration adapter.
If there was an error during the bump test:
1. An error is displayed for the measuring channel.
!
2. Repeat the bump test.
3. If necessary, replace the sensor.

5.4.2 Checking the response time (t90)

1. Carry out a bump test and perform a simple check of
2. Compare the measured response time with the
the certified adjustment time as this simplified method
does not comply with the standard.
a. Select > Maintenance > Bump test (if
configured using the Dräger CC-Vision PC
software).
b. > Log in
Enter and confirm the password.
Select Maintenance > Bump test.
flow must be 0.5 /min and the gas concentration
must be higher (lower with oxygen) than the alarm
threshold concentration that is to be tested.
to start the bump test.
 All measuring channels which are included in the
bump test flash, and all others are greyed out.
When a measuring channel successfully passes
the test, appears.
channels included in the test successfully passed or
failed the test.
● Select and then confirm the dialog to discard
the result.
● Select to confirm the result.
the response time.
a. Connect the test gas to the calibration adapter
and open the valves on the test gas cylinder so
that the calibration adapter is flushed with test
gas.
b. Fit the calibration adapter on the gas detector
and note the starting point.
c. Determine the time until 90 % of the test gas
concentration is reached.
previous bump tests and the t90 values that are
indicated in the enclosed supplementary
documentation (part no. 9033655).
The determined T90 adjustment time may differ from
®
X-am 3500