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4
General design
4.1
Description of the measurement electronics
The front of the unit is divided into different areas: the LED display, the sensor connector and
the terminal strip.
5
Starting up the device
5.1
Switching on the measuring module
The wiring of the measuring module is indicated in the circuit diagram. As soon as the power
is switched on, the module is ready to start.
Once the sensor has heated up, the ‘Ready’ LED changes from red to green.
If the current reading is below the set limit, the ‘Alarm’ LED is green. If it is above the limit,
a red light indicates a combined alarm.
After the sensor has heated up, the measuring module delivers the reading to the assigned mA
output.
5.2
Measurement mode
Once switched on, the module is ready for operation and able to measure the oxygen in gases.
Depending on the type of sensor used, the sample gas either has to be fed to the sensor or the
sensor has to be placed in the sample gas. For details, see the instruction manual for the sensor.
5.3
Switching off the measuring module
It is advisable to keep the sensor & module in continuous operation. This prevents
condensation that could lead to corrosion when using heated sensors.
However, if you do need to switch off the module, you can do this by cutting the power
supply to the measuring module.
For details, see the instruction manual for the A-series sensor.
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PZA-MC25_1620-17485-0002-E-0821
