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SSM 6000
CONT
7 Calibration
7.1
General information
In order to ensure correct measuring results within the specified tolerances, analyzers and systems must be calibrated at regular
intervals. With the SSM 6000, the individual gas types are calibrated using certified calibration gases and/or calibration gas mixtures.
Note that incorrect calibration leads to incorrect results during subsequent measurements!
Before any service or maintenance intervention, the higher-level system (plant control system) must be notified of any
such work in advance in order to avoid emergency shut-down of the motor in response to incorrect measuring values.
The calibration procedure in general:
7.2
Calibration setup and calibration gases
Certified calibration gases or calibration gas mixtures and a suitable cylinder pressure reducing valve with a setting range of the
output / back pressure of equal to or less than 3 bar are required for calibration. During measurement / calibration, the inlet pressure
at the device should range from 10 up to a maximum of 100 mbar. An output or back pressure of < 0.2 bar at the cylinder pressure
reducing valve without flow is usually sufficient for this purpose.
Please note that too high an admission pressure at the measuring input can cause damage to the device!
Furthermore, a hose with the appropriate connections is required in order to transport the gas to the analyzer.
Recommended calibration gas mixtures:
40 Vol.% of CO
, 300 ppm H
-
2
40 Vol.% of CO
, 850ppm H
-
2
The IR sensors must always be calibrated using a test gas mixture of methane and carbon dioxide. Other gas
mixtures, such as methane in nitrogen, are unsuitable for calibration. This also applies to the "hydrogen" option.
With regard to calibrating the oxygen channel, it is important that the calibration gas used does not contain any oxygen because
this would mean that it is not possible to determine the zero point of the sensor. The O
process using filtered ambient air.
Standard calibration gases usually feature a manufacturing accuracy of ±2% for gases expressed in percent by volume and ±3% for
H
S. When the calibration gas cylinder is changed, this can lead to display deviations of up to 4% or 6%, respectively, under worst-
2
case conditions.
800C-07.07.EN
Recording the actual condition
-
Use calibration gas in order to calibrate the device.
-
Perform a test measurement in order to check the calibration.
-
Resume normal measuring operations.
-
S, balance: CH
(60Vol.%)
2
4
, rest CH
(60 Vol.%) analyzers with the "hydrogen" option
2
4
SSM 6000C User Manual
sensitivity is determined during the rinsing
2
CALIBRATION
50
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