Ecotech Acoem Serinus 10 - Optical Bench; Figure 5 - Optical Bench Major Parts; Figure 6 - Orifice and Sintered Filter

Serinus® 10 User Manual 3.2
Page 28
1.5.4 Optical Bench
Refer to Figure 1 for the location of optical bench. The optical bench is the main part of the Ozone
analyser. Major parts in the optical bench are detector, detector PCA, measurement cell, orifice and
sintered filter, UV lamp, heater and thermistor, pressure sensor PCA and lamp driver PCA.
Figure 5 – Optical Bench Major Parts
1.5.4.1 Measurement Cell
Refer to Figure 5 for the location of measurement cell. The measurement cell is a glass tube with a UV
lamp at one end and a detector at the other. UV radiation is sequentially absorbed by sample air and
Ozone free sample air over the length of the measurement cell. The remaining UV radiation reaching
the detector is measured and used to calculate the O
3
concentration.
1.5.4.2 Orifice and Sintered Filter
Refer to Figure 5 for the location of orifice and sintered filter. The critical orifice is made of a high
precision stainless steel and sapphire, which is located under the sensor mounting block fitting. The
critical orifice is a simple device that operates at a set temperature and requires minimal maintenance,
it will passively keep the volume flow rate constant at a known value.
Figure 6 – Orifice and Sintered Filter