Span Calibration; 1Span Calibration Failure: Toxic And Lel Sensors - Honeywell MultiPro Manual

standard fresh air /zero calibration, the
MultiPro will alternate between the
following two screens:
3. The fresh air/zero calibration is complete
when the instrument begins another 5-
second countdown for the span
calibration. If span calibration is not
required, allow the countdown to reach 0
without pressing the MODE button.
If the MultiPro still fails to calibrate after
attempting to force the fresh air / zero
calibration, contact Honeywell Analytics.
4.3

Span Calibration

Once the fresh air / zero calibration has been
successfully completed, the MultiPro will
automatically proceed to the automatic span
calibration countdown screen.
Press the MODE button before the countdown
is complete to initiate the span calibration.
The screen will immediately show "APPLY
GAS" and then list the sensors for calibration
and the expected levels of calibration gas.
Note: Honeywell Analytics recommends
the use of multi-component calibration gas
for calibrating the MultiPro.
Apply calibration gas as shown above in figure
4.1. The readout will change to a numerical
display almost immediately and will continue
to display the current readings.
The actual calibration of
the oxygen sensor to
20.9% occurs during the
fresh air calibration, but
the oxygen sensor is
tested for response to
diminished oxygen levels
during span calibration. Honeywell Analytics
calibration gas cylinders typically contain
approximately 18.0% oxygen. In order to
pass the span calibration, the instrument must
register an oxygen reading below 19.5%
during span calibration.
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See section 4.3.2 below if the oxygen sensor
does not detect the drop in oxygen level and
fails the span calibration.
The calibration is fully automatic from this
point on. Upon successful calibration of a
sensor, the MultiVision will beep, show the
adjusted reading for the calibrated sensor and
then move on to the next sensor.
Once the calibration of all sensors is
successfully completed, the MultiPro will
briefly show the maximum adjustment values
screen.
The maximum adjustment
values for the LEL and
toxic sensors give an
indication of the remaining
sensitivity of the sensors.
As sensitivity decreases,
the maximum possible
adjustment will decrease to approach the
expected concentration of the calibration gas.
Note: Once the calibration cycle is
completed, the MultiPro will automatically
turn itself off. Disconnect the calibration
assembly prior to turning the instrument
back on.
4.3.1 Span calibration failure: Toxic and
LEL sensors
When there is a span calibration failure, the
display will show CAL Error and display the
sensor that has failed calibration.
If the instrument fails to
recognize the correct type
or concentration of
calibration gas, it will show
"no GAS".
When span calibration is
due, the MultiPro's display
will show the warning symbol while
intermittently displaying the calibration bottle
in the gas readings screen.
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