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Calibration menu
8.4 External pressure calibration
This option is only available if the external pressure option has been enabled for both channels. Refer to
Advanced configuration - K1200 sensor on page 53 and Advanced configuration - TC sensor on page 52.
Enable channel 1 first, then channel 2.
8.5 Calibration reports
External pressure calibration
Two calibration methods for the external pressure sensor can be selected:
• Two point calibration (recommended)
• One point calibration
By default the two point calibration is selected.
Two point calibration
(recommended)
Connect a certified absolute pressure gauge to the sample line, and use a
certified precision barometer.
• The two point calibration starts with barometric pressure for the lower
point. Expose the external pressure sensor to the atmosphere.
Enter the barometric pressure read on the barometer in the upper
window and validate P1.
• Expose the external pressure sensor to line pressure, making sure it is
exposed to the same pressure as the certified absolute pressure gauge.
Enter the absolute pressure value read on the certified absolute
pressure gauge in the lower box, and validate P2.
Note: Any pressure can be used for P1 and P2, but for an accurate
calibration P1 and P2 should be as different as possible.
One point calibration Connect a certified absolute pressure gauge to the sample line.
• Expose the external pressure sensor to the line pressure, making sure it
is exposed to the same pressure as the certified absolute pressure
gauge.
Enter the absolute pressure value read on the certified absolute
pressure gauge in lower box, and validate P1.
Note: Any pressure can be used for P1, but for one point it should be as
close as possible to the sample pressure
Calibration reports
Once a calibration is completed (for a gas or pressure sensor), the calibration report is updated with the
new details. The calibration report contains data for the last 50 calibrations.
For full details on the data displayed for all the different type of calibration reports. Refer to Data
available on page 77 for examples.
Each calibration record will contain parameters useful for traceability. For instance, it will contain:
• the user name and ID
• the date and time
• the calibration coefficient
• all the measurements which influence the calibration (temperature, barometric pressure, current,
etc.)
Calibration reports are generated after a sensor calibration. For interfering gas calibration reports, you
will be asked to select the interfering gas from those available.
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