MSA SUPREMA - Page 188

REV 0, June 2005Page 188
Operation Manual SUPREMA
7. Maintenance and Service
Note: Enter the concentration of the test gas in the zero gas in this field (usually
0%), not the zero gas concentration.
Attention: The value must be identical to the lower limit of the measuring range,
which means it must be equal to zero.
• Enter the test gas concentration in the “Test Gas” field.
• If the test gas is different from the reference gas entered in the “Setup/Measure points”
menu, select the test gas used in the “Test Gas Type” field.
• Start calibration with the “Start” control field (select the control field, press “Enter”).
Note: We recommend the use of test gas with a concentration of approximately
50 % of the measuring range of the measure point. In no case should the test gas
concentration be less than 25 % of the extreme value of the measuring range. If
possible, the test gas (the gas which used to calibrate the sensor) and the
measurement gas (the gas to be monitored) should be identical. If this is not the
case and a reference gas is used, the response factor of the gas concentration
used must be known (see O & M instructions for the sensor, reference curve).
Attention: Exceptions to this rule are sensor types D-8101, D-8113, DF-8201,
DF-8250, DF-8401 and DF-8603. Because of the nonlinear output signal of these
sensors, they should always be calibrated to the rating [extreme value of the
measuring range] (provided that this is below the LEL [lower explosion limit].
Person 2:
• Supply zero gas through the test adapter to the sensor assigned to the selected
measure point (duration and flow rate according to the sensor O & M instructions).
Person 1:
• After actuating the “Start” field, you will be asked for the password at the first measure
point. Enter password or actuate the key switch.
• The “End Calibration” submenu will appear.
• The readouts “SENS.%” and “UX mV” are currently still not available.
• The values of the preceding calibration are shown in the line “OLD”. The values of the
current calibration are shown in the line “NEW” after the control field has been actuated
“[Store]“. In a preliminary calibration, the line “OLD” is blank.
• In the “Signal=” field, the current measurement value of the measure point to be cali-
brated is shown. After the zero gas has been supplied for a sufficient period of time – all
5 digits of the bar display are filled black – actuate the control field “[Store]” to confirm the
value. The value is now shown in the field “CAL-ZERO/mV”.
Person 2:
After you have been informed by person 1 that the zero point calibration has been
completed successfully, cut off the zero gas supply and start with the test gas supply.