SHB_U14 Chapter 3: Module components 3-15
Calibration cell
Location in module
The calibration cell is a option to be mounted in the calibration unit.
A calibration cell can be installed in each beam path.
Structure
The calibration cell housing consists of a gold-plated metal frame with four
chambers that are sealed gas-tight by means of infrared-transparent windows.
Three chambers are filled with nitrogen.
One chamber is filled with the required test gas mixture.
Function
The calibration cell is used to calibrate span.
There can be one calibration cell per beam path.
If there are two infrared detectors in the beam path the calibration cell has a mixed
fill.
Calibration cell gas fill can be compared with a test gas flask.
The concentration stamped on the calibration cell is the fill concentration. This is
not the calibration concentration for the Uras 14. It must be determined with a test
gas.
Figure 3-17
Calibration cell
1N
2
fill ports (sealed gas-tight and soldered)
2 and 3 Chambers filled with N
2
, in beam path 4 for meas. and zero
alignment Chamber filled with N
2
, in reference beam path 5 for
span calibration Chamber filled with test gas, in meas. beam path
for span calibration
6 Test gas fill ports (sealed gas-tight and soldered)
7N
2
fill ports (sealed gas-tight and soldered)
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