Serinus 40 User Manual 2.2
3. If the calibration fails then the instrument may have a hardware fault. The cell pressure PCA and
the manifold pressure PCA have test points. To determine if the pressure sensor is faulty simply
measure the voltage on the test points shown in the photos. The voltage measured across the
test point is proportional to the pressure measured by the sensor, so if the sensor is exposed to
ambient pressure at sea level then the voltage will be around 4 volts but if the sensor is under
vacuum then the voltage will be low (e.g. 0.5 volts). If the test point measures zero or negative
voltage then the assembly is most likely faulty and will need to be replaced.
Figure 59 – Test point location
Figure 60 – Typical test point reading of cell pressure with vacuum connected to exhaust port
Figure 61 – Typical test point reading of manifold pressure sensor
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