Dräger X-am 1700 Notice D'utilisation page 10

Instrument test with gas
(Bump Test)
Prepare the test gas cylinder. A gas flow of 0.5 L/min is
required. The test gas concentration shall above the A1
alarm limits.
Connect the hose from the gas cylinder to the calibration
cradle (order no. 83 18 752).
ATTENTION
Do not inhale test gas. Danger to health!
Observe the hazard warnings of the relevant safety data
sheets.
Switch on the instrument.
Place the instrument in the calibration cradle and push it
down, until it clicks in.
Open the vent of the test gas cylinder to apply gas to the
instrument.
Wait until the device displays the test gas concentration
with sufficient tolerance –
1)
Ex: 40 %LEL ... 74 %LEL
1)
O : 17.4 vol. % ... 18.6 vol. %
2
1)
H S: 12 ppm ... 18 ppm
2
1)
CO: 40 ppm ... 60 ppm.
Depending on the applied gas concentration, the instru-
ment shows the gas readings alternating with » A1 « or
» A2 «.
Close the vent of the test gas cylinder.
Take the instrument out of the calibration cradle.
If the displays are outside of the above-mentioned ran-
ges:
calibration by trained personell is required.
Calibration
Calibration may not be possible due to device and channel
errors.
Carrying out the fresh air calibration
Calibrate the instrument to fresh air, free of the presence
of measured gases or other interfering gases. During the
fresh air calibration the zero point of all sensors (with the
exception of DrägerSensor XXS O ) is set to 0. The dis-
2
play of DrägerSensor XXS O is set to 20.9 vol.%.
2
____________
1) Upon application of the Dräger mixed gas (order no. 68 11 130) the dis-
plays should be in this range. Different concentrations can be
adjusted using the enclosed software Dräger CC Vision.
10
Switch on the instrument.
Press the [ + ] key and keep it depressed for 5 seconds,
enter the password (password on delivery = 001), the
symbol for fresh air calibration »
Press the [OK] key to start the fresh air calibration func-
tion.
– The measured values flash.
When the measured values are stable:
Press the [OK] key in order to start the fresh air calibra-
tion.
When the calibration is complete:
– The current gas concentration display changes to the
display » OK «.
Press the [OK] key to exit the calibration function or wait
for approx. 5 seconds. Press the [ + ] key twice to return
to the measuring mode.
If an error has occurred during the fresh air calibration.
– The error message » « appears and »
displayed for the sensor concerned instead of the
measured value. In this case, repeat the fresh air cali-
bration. If necessary, the sensor should be replaced by
qualified personnel.
Calibrating the sensitivity for an individual
measuring channel
– The span calibration can be carried out specifically for
individual sensors.
– During the span calibration, the sensitivity of the
selected sensor is set to the value of the used test gas.
– Use a standard test gas.
Allowed test gas concentration:
Ex: 40 to 100 %LEL
O 10 to 25 vol. %
2
CO: 20 to 999 ppm
H S: 5 to 99 ppm
2
Connect the test gas cylinder with the calibration
cradle.
Vent the test gas leaving the adapter into a fume
cupboard or into the open air (with a hose connected to
the second connector of the calibration cradle).
ATTENTION
Test gas must not be inhaled. Risk to health!
Observe the hazard warnings of the
relevant safety data sheets..
Switch on the device and insert it into the calibration cr-
adle.
Press the [ + ] key and keep it depressed for
« appears. 5 seconds to call the calibration menu, enter the
password (password on delivery = 001).
Using the [ + ] key, select the span calibration function,
the symbol for span calibration »
flashes.
Press the [OK] key to start the channel selection.
– The display flashes and shows the gas of the first
measuring channel, e.g. » Ex - %LEL «.
Press the [OK] key to start the calibration function of this
measuring channel, or use the [ + ] key to select another
measuring channel (O
ppm).
– The calibration gas concentration is displayed
Press the [OK] key to confirm the calibration gas con-
centration or use the [ + ] key to change the calibration
« is
gas concentration and complete the process by pres-
sing the [OK] key.
– The measurement value flashes.
Open the test gas cylinder valve to let gas flow over the
sensor with a volume flow of 0.5 L/min.
– The displayed, flashing measurement value changes to
the value according to the supplied test gas.
When the displayed value has stabilized
(after at least 120 seconds):
Press the [OK] key to perform the calibration.
– The display containing the current gas concentration
changes with the display » OK «.
Press the [OK] key to end the calibration of this measu-
ring channel.
– The next measuring channel may appear for calibration.
– After the calibration of the last measuring channel, the
device changes to the measuring mode.
Close the test gas cylinder valve and remove the device
from the calibration cradle.
If a fault occurred during the span calibration:
– The fault message »
displayed for the respective sensor instead of the
measured value.
In this case, repeat the calibration.
If necessary, replace the sensor.
Note on adjusting the Ex channel to nonane as the
measured gas:
– When calibrating the Ex channel, propane can be used
as a substitute for the calibration gas.
– When using propane to adjust the Ex channel to nona-
ne, the display must be set to 2x the test gas concentra-
tion used.
«
- vol. %, H S - ppm or CO -
2 2
« appears and » « is