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PHOTOMETER ASSEMBLY
ETC00781(4) Series 100 e 02/2004
3.2 Photometer with Gas Detector
Fig. 3-2 shows schematically the photometer assembly.
This assembly is similar to the assembly with pyroelectrical detector.
The analysis cells are separated into two halves by means of an internal wall along its axis and
both ends are sealed with windows. This divided the analysis cell in measuring side and reference
side.
Sample gas is flowing through measuring side while the closed reference side contains inert gas
(N
2
).
To prevent measuring errors by preabsorption, two absorber, fitted to the gas connections of the
reference side, absorb CO
2
parts.
The filter cell has a single stage conical shape.
The gas detector is connected by a shielded cable to the separate preamplifier.
For small measuring ranges the preamplifier is mounted at the analysis cell.
For high measuring ranges the preamplifier is mounted at two holding clamps.
GAS DETECTOR