Biosystems MultiPro Reference Manual - 5. Maintenance
21
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 you breath of 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 Batteries
The MultiPro is powered by interchangeable
alkaline and Li-Ion rechargeable battery
packs.
Note: The calibration adapter or sample
draw adapter must be removed from the
MultiPro prior to removing the battery
pack.
To remove the battery pack first loosen the
top center screw on the back of the
instrument, then gently pry the two clasps at
the top of the instrument open while
simultaneously pulling the back cover plate
away from the main instrument housing.
Since the battery pack is housed in the back
cover plate, this will automatically disconnect
power from the instrument.
CAUTION Always turn the MultiPro off
prior to removing the battery pack.
Removal of the battery pack with the
instrument turned on may cause
corruption of stored data in the MultiPro.
Note: Center screw on ATEX / European
version is slightly different.
5.2
Replacing alkaline batteries
The alkaline battery pack contains three AA
alkaline batteries.
The MultiPro
must be
located in a non-hazardous location
whenever alkaline batteries are
removed from the alkaline battery pack.
Removal of the alkaline batteries from
the battery pack in a hazardous area
may impair intrinsic safety.
Use only Duracell
MN1500 or Ultra MX1500, Eveready
Energizer E91-LR6, Eveready EN91
batteries. Substitution of batteries may
impair intrinsic safety.
To replace the alkaline batteries:
1. Remove the battery pack
from the MultiPro as
discussed in above in
section 5.1.
2. Remove the three alkaline
batteries and replace them.
Be sure to align the positive
and negative ends in
accordance with the
diagram under each
battery.
3. Reinstall the back cover plate that was
removed in step 2.
4. Return the battery pack to the MultiPro
and re-tighten the top center screw. The
MultiPro will automatically turn itself on
once the battery pack is reinstalled.
5.3
Maintaining Li-Ion battery
packs
The MultiPro may be equipped with a
rechargeable Li-Ion (Lithium Ion) battery
pack.