MSA SUPREMA - Replacement of Sensors; Replacement of Modules

REV 0, June 2005 Page 195
Operation Manual SUPREMA
7. Maintenance and Service
for MPI – Check Catalytic Combustion Sensors
Sensor type: D-7100
Measuring gas: Methane
Nullgas: Air
Reference gas: Methane
U
x
at open switch (Normal operation): 0 mV
U
x
at closed switch (Alarm): 100 mV
for MPI – Check Semiconductor Sensors
Sensor type: D-8101
Measuring gas: Acetone
Zero gas: Air
Reference gas: Acetone
U
x
at open switch: 1.6 V
U
x
at closed switch: 1.1 V
7.3 Replacement of Sensors
Sensors which are no longer able to reach the minimum signals, the zero point of which can no
longer be adjusted, or which no longer function properly for some other reason must be replaced.
For this purpose, inhibit the corresponding measure point in the “Setup/Measure Points” menu.
Then perform the following steps:
• Remove the connector plug of the sensor from the MAT-/MAT-TS module or the sensor
cable from the MGT-40-TS module.
• Pull out the old sensor, put the new (properly functioning) sensor in its place, and install
it
(see section 5.6 Connection of the Sensors).
• Reconnect the connector plug of the sensor to the MAT-/MAT-TS module or the sensor
cable to the MGT-40-TS module.
• Perform a preliminary calibration as described in section 6.3 Start the Sensors , under
consideration of the required sensor recovery time.
• Check the configuration of the sensors in the “Setup/Measure Points” menu.
• Unlock the measure point.
7.4 Replacement of Modules
When a module is found to be defective, it must be replaced.
Attention: An MSA service technician must be called in to help with the diagnosis
and to help decide whether the module must be replaced or not.