Envent Engineering Ltd. Page 18 Revision 2.4
Sample Chamber
The sample chamber is the component that allows the H
2
S sample to come in contact
to the H
2
S sensing tape which in turn is read by the sensor block. The sample
chamber is made of the following components:
Figure 6. Sample Chamber (Exploded View)
Sensor Block
The sensor block measures the intensity of the LED light reflected off of the H
2
S
sensing tape. It is composed of an electronic board, a red light emitting diode and a
photodiode, refer to Figure 6. As the tape gets darker due to exposure to H
2
S, the
photodiode receives less light. Less light translates to more H
2
S.
Window & Gasket
These two components seal the small compartment where the H
2
S comes inside the
sample chamber, refer to Figure 6. The window keeps a clear view for the LED and
the photodiode to work properly and isolates them from the sample gas. The rubber
gasket seals the Sample Chamber compartment preventing any leaks.
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