Thermo Scientific Odalog G20, Руководство пользователя

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OdaLog Portable Gas Loggers Maintenance | 43
Sensor Calibration
Null Mode
TRANSMIT MODE should be TURNED OFF prior to
calibration, as the wireless transmissions can interfere with
the sensor readings. If transmit mode is turned ON during
calibration
– any transmissions to the server will cause any
NULL or SPAN screens to be cancelled. If a log of the
calibration is required, its recommended to turn the logging
and transmission off before performing calibration. This may
be useful for automatically calculation of sensor response and
accuracy.
Span Mode
Insert the calibration fitting over the sensor in the bottom of
the instrument, as shown in
Figure 59
.
Figure 59. Calibration Mixture Connections
Attach regulator to gas cylinder and fit plastic tubing over an
inlet on the calibration adaptor. (
Figure 59
).
Open regulator and allow gas to pass over the sensor at the
flow rate and for the flow time as detailed in
Table 3
.
After waiting for the time shown in
Table 3
, the gas reading
on screen should have stabilised and calibration can be
performed. Ensure gas is still flowing over sensor.
“DONE” will
appear briefly on the LCD screen and it will return to the
“IN S T” screen indicating a successful calibration.
“ bAd1 ” or “ bAd 2” or “bAd3” or “bAd4” or “b Ad5 ” will appear
indicating the span value saved will be inaccurate due to
different reasons mentioned in
Table 9
.
“FAILED” calibration (sensor will not save Span value). LCD
will return to “INST” screen. Ensure that instantaneous display
reads the same as shown on cylinder before turning off gas
regulator and removing calibration fitting. Ensure that reading
returns to close to zero within 5 minutes in clean air and re-
zero if necessary.