Siemens ULTRAMAT 6 Series - Calibration

The device must be set up in a well ventilated place so that an explosive mixture cannot build
up in the device environment.
If the device is installed in a cabinet, it must be insured through suitable measures that the
ventilation rate in this cabinet amounts to at least 1/h (exhaust air at cabinet cover, supply air
at cabinet bottom).
2.6.1 Calibration
Calibration
The CALOMAT 6 must be adjusted or calibrated at 2 points: At the zero point for 0 % H
2
and at
the impact point (sensitivity) for 100% H
2
. To operate the CALOMAT 6, see the operating
instructions CALOMAT 6 (A5E00116454) section 5.2.2.
Required gas concentrations:
• 100% nitrogen (N
2
) – inert purging gas
• 100% oxygen (O
2
) (purity 99.999% O
2
or better) – zero-point calibration
• 100% hydrogen (O
2
) (purity 99.999% O
2
or better) – sensitivity calibration
Proceed as follows:
1. Check the calibration setting in Function 23. The overall calibration must be activated. All
measuring ranges are calibrated in their entirety.
2. Check the setting of the setpoint values in Function 22. The value 0.000 must be entered as
the setpoint value for the zero point. Measuring range 3 must be selected as the leading
measuring range. The 󹪝nal value concentration must be entered with 100% vol.
3. Zero-point calibration: Select Function 20. First 󹪞ush the gas path with the inert gas
nitrogen to 󹪞ush any hydrogen concentration in the gas path. The measured value does not
change to 0 % H
2
but to about -1.4 % H
2
because N
2
has a di󹪜erent thermal conductivity than
O
2
.
4. Apply 100% O
2
concentration to the device. Wait long enough until the measured value is
stable. This can take 5 minutes. The measured value should lie close to the value 0 % vol. H
2
.
5. Trigger the calibration in Function 20.
6. Sensitivity calibration: Select Function 21. Flush the gas path with inert gas N
2
.
7. Apply the 100 % H
2
concentration to the device. Wait again until the measured value is stable.
8. Trigger the sensitivity calibration in Function 21.
9. Then 󹪞ush again with inert gas N
2
.
10.Apply and acknowledge the calibration by pressing the "MEAS" key.
Safety instructions
2.6Measurement of hydrogen in oxygen with Calomat 6E
Series 6 and ULTRAMAT 23
Compact Operating Instructions, 01/2024, A5E45779144002-AB 23