7-14
7.3 Calibration Menu ‘ CAL’
The calibration menu allows the calibration settings
of the detector to be changed. The calibration menu
comprises of 4 submenus as shown in the table
below.
Table 7-4. Calibration mode submenus.
Calibration
submenu
Icon Calibration setting
Zero Set detector zero
Span Set detector span
Flow Calibrate detector sample flow rate
mA mA Calibrate detector analog output
To select the calibration menu from normal
operation, press the ‘s’ up button for a few seconds.
Enter the pass code (if set). Use the ‘s’ up or ‘t’
down buttons to select the calibration menu ‘ ’ icon
and press the ‘3’ accept button.
7.3.1 Zero Calibration ‘ 0CAL’
1. Use the ‘s’ up or ‘t’ down buttons to select the
zero calibration ‘ 0CAL’ submenu and press ‘3’
to accept.
2. The zero calibration icon starts flashing in order
to tell the user to prepare to apply zero gas.
3. The inhibit ‘ ’ icon is also displayed indicating
that no alarm outputs will be generated during
this process.
4. For CO2 calibrations, apply CO2-free air for
three minutes.
5. Press ‘3’ to confirm when ready and the icon
goes steady.
6. For non-CO2 calibrations, apply the zero gas
(or ambient air).
7. The dots on the left of the display indicate
progress to a successful zero.
8. The display will show the zero gas reading and if
measured to be stable for an appropriate period
of time will display ‘PASS’.
9. If the zero calibration is unsuccessful then the
display will show an error code (see table below).
10. Press ‘3’ to accept calibration result (Updt will
be displayed).
11. Use ‘s’ up or ‘t’ down to select “InhY” or “Inhn”
to set Full Inhibit (refer to table 7-8 for details
on inhibit states) or keep the initial inhibit state.
12. Press ‘3’ to accept inhibit state.
13. Use ‘s’ up or ‘t’ down to set the inhibit timeout
from 0 minutes to 4 hours. The timeout value will
be displayed as hour : minute. The default value
is 30 minutes (00:30).
14. Press ‘3’ to accept the inhibit settings (Updt will
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