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NDIR Gas Analyzer
Without this delay, or if the delay is set too short, it is possible to
generate calibration errors. In most cases the instrument will
attempt to recalibrate. After 5 recalibration attempts the
instrument will generate a LOW CALIB FLOW ALARM. If
this occurs, see Section 6.3.1.
NOTE:
The CAL DELAY submenu is not present on the battery operated
portable instrument.
NOTE:
Autocalibration is not available on the battery operated portable
model.
•
Set calibration delay time. Use the UP and DOWN
arrows on the front panel while holding in the SETUP
button to enter or change a delay period.
•
Save changes. After entering a value and releasing the
SETUP button, you will be prompted to save or else
lose the changes you made. There is a 60-second timer
on this screen. Press the UP button to save your
changes or the DOWN button to discard the changes
within the 60-second time limit. A confirmation screen
will then appear.
To determine the optimum delay time, initiate a manual
span calibration (see Section 5 Calibration) and while
watching the display, note the time it takes to reach a
stable span calibration reading. Add 10% to this reading
and use this value for the CAL DELAY.
NOTE:
In models with dual optical benches, the CAL DELAY value must be
the same for both channels.
When performing a manual calibration, if the
calibration flow has already been established and stable
readings exist, set the CAL DELAY to 15 seconds (60
seconds for trace instruments).
During the calibration event, if the instrument detects a
change in the gas concentration, it will automatically
attempt to recalibrate. This could occur for example, if
there is a leak in the sample system upstream of the
detector. If after 5 attempts at calibration the system
still detects an unstable concentration, a LOW CALIB
FLOW alarm will be indicated on the display. If this
occurs, refer to Section 6.3.1.
Teledyne Analytical Instruments., - Rev. 3
Operation 4
37
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