Calibrating the sensitivity for an individual
measuring channel
A potentially activated H
added signal is automatically temporarily deactivated
2
during a manual calibration, a PC calibration or an automatic Bump Test for the
relevant duration.
–
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:
Dual IR Ex
20 to 100 %LEL
IR Ex
Dual IR CO
2
0.05 to 5 vol.-%
IR CO
2
O
10 to 25 vol. %
2
CO
20 to 999 ppm
H
S
5 to 99 ppm
2
Test gas concentration of other gases: see Instructions for Use for the
respective DrägerSensors.
a)
Depending on the selected data set.
b)
Depending on the measuring range and the measuring accuracy.
z
Connect the test gas cylinder with the calibration cradle.
z
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).
Risk to health! Do not inhale the test gas.
Observe the hazard warnings of the relevant safety data sheets.
z
Switch on the instrument and insert it into the calibration cradle.
z
Press the [ + ] key and keep it pressed for 5 seconds to call the calibration
menu, enter the password (password on delivery = 001).
z
Use the [ + ] key to select the single gas calibration function. The symbol for
span calibration »
« flashes.
z
Press the [ OK ] key to start the channel selection.
NOTICE
a) b)
a) b)
/ 5 to 100 vol.-%
b)
WARNING
In the case of the CO
channel there is a 2-stage calibration routine:
2
The zero point calibration takes place first and is then followed by the span
calibration.
–
The display flashes the gas of the first measuring channel, e.g.
» ch
- LEL «.
4
z
Press the [ OK ] key to start the calibration function of this measuring
channel, or use the [ + ] key to select another measuring channel (O
vol. %, H
S - ppm or CO - ppm, etc.).
2
–
The calibration gas concentration is displayed
z
Press the [ OK ] key to confirm the calibration gas concentration or use the
[ + ] key to change the calibration gas concentration and complete the
process by pressing the [ OK ] key.
–
The measurement value flashes.
z
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 measurement value displayed is stable (after at least
120 seconds):
z
Press the [ OK ] key to perform the calibration.
–
The display containing the current gas concentration changes with the
display » OK «.
z
Press the [ OK ] key or wait about 5 seconds in order to complete the
calibration/adjustment of this measuring channel.
–
The next measuring channel may appear for calibration.
–
After the calibration/adjustment of the last measuring channel, the
instrument changes to the measuring mode.
z
Close the test gas cylinder valve and remove the instrument from the
calibration cradle.
If a fault occurred during the span calibration:
–
The fault message »
« appears and »
respective sensor instead of the measured value.
z
In this case, repeat the calibration/adjustment.
z
If necessary, replace the sensor.
NOTICE
« is displayed for the
-
2
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