MSA SUPREMA - Page 192

REV 0, June 2005Page 192
Operation Manual SUPREMA
7. Maintenance and Service
For the calibration, person 1 (at the SUPREMA) and person 2 (at the sensor in question) must
perform the following steps:
Person 1:
• Select the “Maintain/Calibration” menu.
• Select the input to be calibrated in the “Measure Point” field.
• Enter 0 % of the measuring range in the field “Zero Gas” as the zero gasconcentration.
• Enter the test gas concentration in the field “Test Gas”.
• If the test gas is not the same as the reference gas entered in the “Setup/Measure
Points” menu, select the test gas being used in the field “Test Gas Type”.
Note: Sensors with a linear output signal:
The test gas concentration should be in the upper third of the measuring range.
The displayed signal voltage is calculated according to the formula:
Signal = C / 100
*
1600 mV + 400 mV.
Sensors with a nonlinear output signal must be calibrated to the rating. (Take
note of the LEL.) Signal voltage for full scale: 2,000 mV ± 10 mV.
• Start calibration with the “Start” control field (select the control field, press “Enter”).
Person 2:
• Supply the zero gas via the test adapter to the sensor assigned to the selected input
(duration and flow rate as specified in the O&M instructions for the sensor).
Person 1:
• After actuating the “Start” field, you will be asked for the password at the first measure
point. Enter the password or actuate the key switch.
• The “End Calibration” submenu will appear.
• The current measurement value UA of the measure point to be calibrated will appear in
the “Sig:” field. After the zero gashas been supplied for a sufficient period of time (the
value remains stable), confirm the value by actuating the control field “[Store]”. The value
will appear in the field “CAL-ZERO/mV”.
Person 2:
• After being informed by person 1 that the zero point calibration has been completed
successfully, shut off the zero gas supply and start test gas supply.
Person 1:
• The current measurement value UA of the measure point to be calibrated will appear in
the “Sig:” field. After the test gas has been supplied for a sufficient period of time (the
value remains table), confirm the value by actuating the control field “[Store]”. The value
will appear in the he field “CAL-MSAN / mV”.
• Conclude the calibration of the selected measure point by actuating the control field “[End]“.
• A dialog box appears: “Preliminary calibration? NO=<ESC> YES=<ENTER>”. End the
calibration by pressing the “ESC” key. Pressing the ENTER key deletes the
measurement values of earlier calibrations stored in the calibration menu and in the
“Diagnosis/Logbook” menu (should be used only after replacement of a sensor).