29
Maintenance
Carrying Out the Function Test
with Gas (Bump Test)
Manual implementation without the
documentation of result in the device
memory
●
Prepare a test gas cylinder, the volume
flow must be 0.5 L/min and the gas con-
centration must be higher than the alarm
setpoint concentration to be tested.
Example test gas cylinder 68 11 130 =
mixed gas with 50 ppm CO, 15 ppm H
2
S,
2.5 vol. % CH
4
, 18 vol. % O
2
●
Connect the test gas cylinder with the ca-
libration cradle (83 18 752).
●
Vent the test gas into a fume cupboard or
into the open air (with a hose connected
to the second connector of the calibration
cradle).
●
Switch on the device and insert it into the
calibration cradle – press downwards un-
til it engages.
●
Open the test gas cylinder valve to let test
gas flow over the sensors.
●
Wait until the device displays the test gas
concentration with sufficient tolerance –
Ex: 40 %LEL ... 74 %LEL
1)
O
2
: 17.4 vol.-% ... 18.6 vol.-%
1)
H
2
S: 12 ppm ... 18 ppm
1)
CO: 40 ppm ... 60 ppm
1)
If the alarm setpoints are exceeded, the
device displays the gas concentration in
alternation with
» A1 «
or
» A2 «
depen-
ding on the test gas concentration.
●
Close the test gas cylinder valve and re-
move the device from the calibration cr-
adle.
— If the concentration has now fallen under
the A1 alarm setpoint:
●
Acknowledge the alarm.
●
If the displays are outside of the
above-mentioned ranges:
●
Calibrating the device, refer to page 35.
CAUTION
Do not inhale the test gas. Risk to health!
Observe the hazard warnings of the rele-
vant Safety Data Sheets.
____________
1)
Upon application of the Dräger mixed gas (order no. 68 11 130), the displays should be in this range.
Different concentrations can be adjusted using the enclosed software Dräger CC Vision.
00523854_01_en.eps
0.5 L/min
0
