Galvanic Applied Sciences ProTech903, Operation Manual

Page: 23 / 190

Revision 14
23 August 02, 2019
2.7 Sample Chamber Assembly
The sample chamber assembly is the key component in the measurement of the H
2
S
concentration in the gas. The sample chamber assembly allows the sample gas to pass onto
the lead acetate tape, and also contains the detector assembly, (sensor block). An exploded
view of the sample chamber assembly is shown in Figure 2-6.
Figure 2-6: Sample Chamber Assembly Exploded View
2.7.1 Rate/Read Aperture Strip and the Rear
Window Assembly
The Rate/Read Aperture strip and the Rear Window are made of a clear plastic to allow the
light from the sensor block to pass through to the tape to correctly measure the rate of color
change on the tape. The sensor block is held onto the sample chamber via clips. By
tightening the screws on the clips, the rear window is pressed into the rear window rubber
gasket and sealed to the sample chamber by pressure from the sensor block above it. The
rate/read aperture strip is sealed to the inside of the sample chamber using silicone grease.
The sample flow through the sample chamber assembly is shown in Figure 2-7.