SHB_U14 Chapter 5: Testing 5-13
Calibration cell
Accessories
Test gases for zero and span points.
Visual check • For the measurement and zero calibration function the calibration cells placed in
the calibration unit slide should be in the lower position.
• Move them to the upper position for the span calibration function.
• Tubes and cables should not interfere with slide movement.
• The shipping lock (tube) must be removed.
• The windows should not be damaged in any way, in particular they must be free
of cracks.
(this can only be checked in the installed position)
Replace the calibration cell if a window is damaged.
Function check
Normally concentration(s) in the calibration cell test gas chamber are stable over a
period of years. They should, however, be checked every year.
Refer to
Operator’s manual
→ Chapter 9. Inspection and maintenance → Measure
calibration cell in Uras 14.
This check requires the zero and span gases for calibration of the largest
measurement range.
Desired value
Since the span point of the large measurement range of the applicable IR detector
is calibrated using the calibration cell, the following concentrations should be
found:
• 70 to 90 % of the largest measurement range concentration
• Smaller concentrations are possible, but the calibration will be imprecise.
For most official measurements this is not permissible.
• In case of a large concentration loss (> 20% of the concentration entered),
replace the calibrate cell as soon as possible.
The concentration(s) shown on the calibration cell are the fill concentrations.
The calibration concentration is determined when installed in the analyzer.
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