en
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Operation
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without calibration adapter: Ensure that the transmitter is in clean
ambient air (no combustible gases or vapours present), or
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with calibration adapter: Supply zero gas (clean air) at a flow rate of
approx. 0.5 L/min via the calibration adapter.
The transmitter's display shows the current measured value for zero gas
and for clean ambient air, which generally differs slightly from zero.
Negative values are displayed down to "-5"% LEL for the measuring
range up to 100% LEL or down to "-,9" for the measuring range up to
10% LEL.
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Wait until the reading has stabilised (max. 3 minutes) and press keys
(▲+▼). This converts the current sensor signal to the zero-point, and the
display shows the newly set zero-point (ideally "0").
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Press ( +▼) to save the updated zero-point and to terminate the zero
adjustment.
WARNING
After a sensor replacement, the transmitter's zero-point may initially be
negatively misaligned so much that it cannot be displayed as a negative value.
The display then shows "--". In this case, press keys ( +▼) to save the new
zero-point and perform the zero adjustment again, if necessary.
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Press keys ( +▼) to terminate the zero adjustment. The display shows ZE
once again.
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Press the ▲ key to return to the measuring mode or the ▼ key to calibrate
the sensitivity.
5.3.1.2
Calibrate sensitivity
The zero-point must be calibrated before the sensitivity adjustment!
30
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In the calibration menu, navigate using the ▲ or ▼ key until the display
shows SP ("SPan") and confirm by pressing the (▲+▼) keys. The
measured signal is set to 3.4 mA to indicate the calibration mode to the
controller.
The display shows the test gas concentration used during the previous
adjustment in % LEL.
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Use the ▲ or ▼ key to set the concentration of the test gas currently in use
for the measuring range up to 100% LEL between 20 and 99% LEL in 1%
LEL steps.
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For the measuring range up to 10% LEL, a decimal point appears, i.e. the
concentration of the test gas can be adjusted between 2.0 and 9.9% LEL in
steps of 0.1% LEL.
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Pressing the keys for a longer period activates the repeat function.
Recommended test gas concentration:
Full scale value
100% LEL
10% LEL
CAUTION
The test gas must consist of the gas component to be monitored and air.
Calibration gases filled in nitrogen are unsuitable for this task!
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Press the (▲+▼) keys and – depending on the transmitter type – apply the
recommended test gas concentration (see table) at a flow rate of approx.
0.5 L/min via the calibration adapter.
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Wait until the reading has stabilised (max. 3 min) and press the (▲+▼) keys
to calculate the necessary internal amplification of the transmitter. The
display shows the measured value with the newly calculated amplification
factor; however, this has not yet been saved. The original amplification
factor is restored if the calibration function is automatically exited by waiting
for more than 4 minutes in this status.
Test gas concentration
30 to 70% LEL
3 to 7% LEL
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