2Span Calibration Failure: Oxygen Sensors; Maintenance; Cleaning; Storage - Honeywell MultiPro Manual

The MultiPro will also display a "Needs Cal"
message for any sensors that are currently
due for calibration during instrument start-up.
Possible causes of span calibration failure
and remedies:
1. Empty calibration gas cylinder. Verify that
there is calibration gas in the cylinder.
2. Expired calibration gas cylinder. Verify
that the expiration date on the cylinder has
not passed.
3. Calibration gas setting does not
correspond to calibration gas
concentration. The default calibration gas
settings are 50% LEL, 50PPM CO and
25PPM H S. If the values on the
2
calibration cylinder are different from the
instrument's calibration gas settings, the
MultiPro's calibration gas settings must be
changed to match the new values.
Calibration gas values can be changed
with the MultiPro programming software
(available separately) or by accessing the
setup menus with the MODE button as
discussed in section 6.6 below.
4. LEL only: Type of calibration gas
(standard) has changed significantly. LEL
calibration gas may be based on several
different response standards, methane,
propane and pentane are the most
common. If using a new cylinder of
calibration gas, make sure that the type
and amount of combustible gas is identical
to that of the previous bottle. Honeywell
Analytics offers calibration gases in
Methane, Propane Equivalent and
Pentane Equivalent.
5. Dead sensor. Replace sensor.
6. Instrument problem. Return the
instrument to Honeywell Analytics. Call
the phone number on the front of this
manual.
4.3.2 Span calibration failure: Oxygen
sensors
Honeywell Analytics multi calibration gas
cylinders contain approximately 18.0%
oxygen. The reduced oxygen level in the
calibration gas cylinder allows the oxygen
sensor's response to be tested in the same
manner as the toxic and LEL sensors.
If the O sensor fails to register a reading
2
below 19.5% during the span calibration, the
display will show O2 Too
Low followed by the O2
CAL Error screen
immediately after the failed calibration
attempt.
Press MODE to acknowledge the warning and
turn the instrument off.
If the oxygen sensor fails to register the drop
in oxygen during the span calibration while
being challenged with calibration gas
containing less than 19.0% oxygen, it should
be considered out of tolerance and retired
from service immediately.
A sensor that cannot be
calibrated or is found to be out of
tolerance should be replaced immediately.
An instrument that fails calibration may
not be used until testing with known
concentration test gas determines that
accuracy has been restored, and the
instrument is once again fit for use.
Possible causes and remedies for oxygen
sensor failure:
1. Calibration gas cylinder does not contain a
reduced level of oxygen. Verify that the
cylinder contains less than 19.0% oxygen.
To challenge the oxygen sensor without
calibration gas, hold your breath for about
10 seconds (or more), and then slowly
exhale directly onto the face of the sensor
(in the same way you would attempt to fog
up a piece of glass). If the descending
oxygen alarm is set to 19.5%, the
instrument should go into alarm after a
few seconds.
2. Oxygen sensor has just been replaced
and has not had time to stabilize.
3. Oxygen sensor failure.
5.

Maintenance

To prevent ignition of
flammable or combustible atmospheres,
disconnect power before servicing any
parts in the MultiPro.
5.1

Cleaning

The exterior surfaces of the MultiPro may be
cleaned using a damp cloth only. Do not use
cleaning agents of any kind. The introduction
of cleaning agents to the detector may affect
instrument functionality.
5.2

Storage

MultiPro detectors may be stored for long
periods in a fresh air environment at
temperatures between 10C/50F and
30C/86F.
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