Calibration Errors (Tc Sensors); Interference Calibration (Tc Sensor); Barometric Pressure Calibration - Hach ORBISPHERE 51 Series User Manual

8.2.1

Calibration errors (TC sensors)

Calibration errors (TC sensors)
The calibration is not possible in the following circumstances:
•
•
•
8.2.2

Interference calibration (TC sensor)

Interference calibration (TC sensor)
This calibration is available for TC sensors and is required when one of the interferences has been
enabled. Refer to
actual measurement.
•
•
Note: For the helium interference in Hydrogen measurement, the instrument uses the entered percentage
of the barometric pressure (or the external pressure) to do the calibration.
8.3

Barometric pressure calibration

Barometric pressure calibration
Upper box shows the barometric pressure measured by the instrument.
Using a precision certified barometer, measure barometric pressure in the location where the measuring
instrument is used. Compare the values, if values are the same press Cancel, otherwise enter the new
barometric value in the lower box and Validate the new setting.
On completion a calibration report is created.
Note: The barometric sensor has been factory calibrated.
When the "ratio ideal current" is greater than 170% or smaller than 30%
When the sensor cannot measure (thermal cut off, sensor out, etc.)
When the "ratio ideal current" is greater than 150% or smaller than 50%, a warning is displayed but
the calibration is valid.
Interferences configuration on page
Select from the interfering gas to be calibrated from those available, or press the Change
configuration button to:
• Interfering He constant: This mode used when exposing TC sensor to sample with the amount
of interfering helium only. Hence remove all the H
recombination) with the remaining gas being helium only.
• Interfering He: Calibrate the interference on the TC sensor to a known amount of helium gas.
Minimum concentration of 10% He.
Hold during calibration: Selected by default, this holds the measurement sequence to avoid storing
invalid values during calibration.
Calibration menu
55. The lower part of the screen displays the
from the sample (via process like
2
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