REV 0, June 2005 Page 185
Operation Manual SUPREMA
6. Startup
Note: Signals UA above 600 mV are not valid for the zero point calibration. Signals
UA below 600 mV are not valid for the span calibration.
• In the start calibration menu, select the next input, and repeat the procedure described
above.
Person 2:
• After you have been informed by person 1 that the sensitivity calibration has been
successfully completed, shut off the test gas supply and start the zero gas supply at the
next sensor to be calibrated.
Note: If the preadjustment was correct, the ACTUAL VALUES for the zero point
will be approximately in the range of 350 mV to 450 mV.
The signal voltage shown is calculated according to the formula:
Signal = Cpr / 100
*
1600 mV + 400 mV
(for sensors with a linear output signal), where Cpr is the concentration of the
test gas as a % of the measuring range. The tolerance is approximately equal to
the signal value in mV ± 100 mV.
Attention: If the signal voltage exceeds a value of 2000 mV during the test gas
supply, a signal failure will be triggered in the system (the Signal Fail LED will
flash). The calibration is invalid. In no case may the calibration value be accepted.
Instead, terminate the calibration by actuating the control field ‘[Cancel]“. Then
check the choice of test gas concentration and make sure that it is being supplied
correctly. It may be necessary to check and correct the preadjustment of the input
on the MAI module.
6.5.3 Active Sensors
A preliminary calibration on the SUPREMA system is not required for active sensors (sensors
with a 4 ... 20 mA output). The preliminary calibration is to be performed directly at the sensor
in accordance with the operating and maintenance instructions of the sensor. As default values,
the SUPREMA system interprets an input current of 4 mA as 0% of the measuring range and
an input current of 20 mA as 100% of the measuring range.
Attention: In the case of sensors which do not send a maintenance level during
calibration, it is recommended that the input be inhibited in the “Setup/Measure
Points” menu during the preliminary calibration.
Note: As part of the startup procedure, it is recommended that the correctness of
the displayed values be checked either by supplying gas to the sensors or by
supplying a constant current to the MAT module from a source of constant current.
The method for correcting the 4 ... 20 mA input is described in
section 7.1.2 Active
Sensors .
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