Functions
6.1 [1] Quick Start
Operating with the Local User Interface
94 Operating Manual, 06/2017, A5E31930478-05
You can set the following types of calibration:
Table 6- 1 Types of calibration ("Customer calibrations")
1-point zero gas calibration This calibration eliminates drifts in the zero point. The setpoint corresponds to the
actual value in the zero point.
1-point span gas calibration This calibration eliminates drifts in the span point by adjusting a sensitivity factor
accordingly. The setpoint corresponds to the actual value in the span point.
2-point calibration In this type of calibration, zero gas validation and span gas calibration take place
1-point calibration with substitute gas
to shift the characteristics offset
Because the thermal conductivity sensor of the CALOMAT 7 shows a stable char-
acteristics gradient after an operating time of about 3 months, regular 2-point cali-
bration is no longer necessary. A monthly 1-point offset calibration is sufficient in
this case; it essentially corresponds to a 1-point zero gas calibration. Keep in mind
during the calibration that the measurement effect of the span gas used must be
within the characteristic of the gas pair. Nitrogen can be used as substitute gas in
most cases. The calibration setpoint must be determined in advance by introduc-
ing the intended substitute gas and writing down the associated measured value
as future setpoint.
This type of calibration always has the character of a zero point calibration (offset
shift of the characteristic).
We recommend a 2-point calibration after running a 1-point calibration with substi-
tute gas twice. This is, however, done at the discretion of the device operator.
Scope/reference
Single calibration
Calibrations can be run as single or total calibrations. Only the selected measuring range is
calibrated in a single calibration, while the calibration parameters of all other measuring
ranges are not affected.
In a total calibration, at first the selected measuring range is calibrated as with single
calibration. But the newly calculated calibration parameters of this leading measuring range
are converted for all other measuring ranges. This means all measuring ranges can be
calibrated with the same calibration parameters.
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