1.5.4.3 Detector
Refer to Figure 5 for the location of detector. The detector is a solar blind vacuum diode, sensitive only
in the spectral region where O
3
absorbs UV light at 254 nm. This detector is used to monitor the
intensity of the residual light after absorption in the measurement cell.
Detector PCA
Refer to Figure 5 for the location of detector PCA. The detector PCA converts the UV light intensity into
a voltage level which is processed by the instrument to calculate the O
3
concentration.
1.5.4.4 Heater and Thermistor
Refer to Figure 5 for the location of heater and thermistor. The heater and thermistor are mounted in
the lamp housing on the UV lamp side of optical bench. They are used to keep the block temperature
at a stable and constant 50 °C.
1.5.4.5 UV Lamp
Refer to Figure 5 for the location of UV lamp. UV lamp is used to produce a beam of UV light at 254
nm. It is powered by the lamp driver PCA.
1.5.4.6 Lamp Driver PCA
Refer to Figure 5 for the location of lamp driver PCA. The lamp driver PCA is mounted under the optical
bench. The lamp driver PCA generates a high-frequency voltage (800 - 1100 V) to start and maintain
the UV lamp at a constant intensity. The UV lamp current is fixed at 10 mA.
CAUTION
The lamp driver PCA contains high voltages. Ensure instrument is turned OFF
before accessing this component.
Note: The lamp driver PCA is the same type as used on the Serinus 50 SO2 Analyser. For the
Serinus 10, with a REV D lamp diver PCA, set all the jumpers marked in red (JP1 - JP5) to the right
(refer to Figure 7). The correct setting must be used or damage to the electronics may occur.
Figure 7 – Lamp Driver PCA Type Jumper Setting (REV D)
1.5.4.7 Pressure Sensor PCA
Refer to Figure 5 for the location of pressure sensor PCA. The pressure sensor PCA has an absolute-
pressure transducer that is mounted to a block on the UV lamp side of the optical bench and sealed
via a gasket. This allows the pressure sensor PCA to measure the sample air pressure in the
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