MSA SUPREMA - Page 184

REV 0, June 2005Page 184
Operation Manual SUPREMA
6. Startup
• Enter the test gas concentration in the “Test Gas” field.
• 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
“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 input. 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, D-8113,
D-8201, 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 the zero gas through the test adapter to the sensor assigned to the selected input
(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. Enter the password or
actuate the key switch.
• The “End Calibration” submenu will appear.
• 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 zero.
• In the “Sig:” field, the current measurement value UA of the input to be calibrated 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.
Person 1:
• The current measurement value UA of the measure point to be calibrated shown in the
“Sig:” field changes. After the test gas has been supplied for a sufficient period of time –
all 5 digits of the bar display are filled black – confirm the value by actuating the control
field “[Store]”. The value is now shown in the “CAL-SPAN/mV” field.
• Conclude the calibration of the selected input by actuating the control field “[End]”.