DeltaOHM HD31, Руководство по эксплуатации

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HD31
- 100 -
V1.6
13.5 C
ALIBRATING THE CO
2
PROBE
Three options are shown by selecting a CO
2
probe for calibration:
• ZERO/FRESH AIR : calibrates the probe in one single point (any value included in the
measuring range).
• LINEAR GAINS : calibrates the probe in two, three or four points.
• FACTORY : sets user calibration equal to factory calibration. This is useful if wrong user
calibration data have been entered and you are temporarily unable to perform a new ca-
libration.
Fig. 13.5.1: calibrations for CO
2
probes
Note : the value used for the barometric pressure compensation is shown at the bottom of the
display; if necessary, change the setting as indicated at paragraph 9.3 at page 74.
Select the desired type of calibration using
S
and
T
, then press the F3 key ( OK command) to
confirm.
If a message appears reminding that the operation will change the probe calibration data, se-
lect YES ( F3 key) to continue (or press F1 to select NO and exit).
13.5.1 ZERO/FRESH AIR
OPTION FOR
CO
2
PROBES
By selecting the ZERO/FRESH AIR calibration option, the instrument displays the calibration
point ( SETPOINT line) and the CO
2
value measured by the probe ( MEASURE line). The calibra-
tion point can be adjusted using
S
and
T
.
Fig. 13.5.2: ZERO/FRESH AIR calibration for CO
2
probes
Calibration can be performed:
• Positioning the probe in environment with known CO
2
concentration value, e.g. in clean
air .
Reference value
Measured value