PROGRAMMING & CALIBRATION
3-6
performed during Fresh Air Zero. Low O
2
calibration at 0% or
19.5% O
2
, or both, is done in Single Sensor calibration mode.
Upon selecting OXY for Single Sensor calibration (see above)
press
[N/-]
for 0% O
2
calibration or
[Y/+]
for 19.5% calibration.
To perform both calibrations in the 3-point mode, the single
sensor calibration must be re-entered after the first calibration
is complete.
Calibration Time Stamp
Whenever span calibration is performed, a time stamp is stored
in the non-volatile memory to be included in datalog reports.
3.2.4. Modify Span Gas Value
Use the keystroke procedures in Table 5 to change the
concentration of the span gases used for calibration.
The span value for oxygen is 19.5% and can be changed
between 19.0% to 20.0%. This value is only used if the monitor
is set to 3-point oxygen calibration (see Section 3.2.6 and
Section 3.2.3 for more details).
3.2.5. Change LEL Span Gas
This function allows selection of the gas to be used for span
calibration of the LEL sensor. The correction factor for the
measurement gas is automatically divided by the correction
factor for the span gas selected here, to obtain a new factor for
the combination of gases. The new factor will be applied to the
readings to obtain a true concentration.
Enter the Change Span Gas menu using the keystroke
procedures in Table 5. When the question “LEL Span = ?
Methane” appears, press
[N/-]
to change the gas and then use
the
[Y/+]
and
[N/-]
keys to scroll through a list of gas names
until the desired gas appears. Press
[MODE]
to save the
selected gas.
3.2.6. OXY Calibration Type
Select 2-point or 3-point O
2
sensor calibration type using the
keystroke procedures in Table 5.
