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4. Gently remove the sensor that is to be
replaced.
Note: Sensor channels in the MultiPro are
specific to the type of sensor that occupies
the channel. When replacing sensors, be
sure to replace one sensor with another of
the same type.
5. Gently insert the new sensor into the
appropriate location on the sensor board.
6. Reinstall the main board assembly that
was removed in step three and reinstall
the four screws. The main board should
easily slide back into place. The screw
holes in the black mylar insulator should
align with the corresponding holes in the
housing. The sensor gaskets should be
centered over the corresponding sensor
ports at the bottom of the instrument,
allowing the gas sample to reach the
sensors. Be careful not to over tighten the
screws.
7. Reattach the battery pack and re-tighten
the top center screw.
8. New sensors must be allowed to stabilize
prior to use according to the following
schedule. The detector must be powered
off and a functional battery pack must be
installed for the sensor to stabilize.
Sensor Stabilization
Period
Oxygen (O
2
) 1
hour
LEL none
CO 15
minutes
H
2
S 15
minutes
Note: Steps 9 and 10 assume that the
sensor stabilization period has passed.
9. If an oxygen sensor was replaced,
perform the Fresh Air/Zero calibration as
discussed in section 4.2.
10. If a combustible (LEL) or a toxic sensor
has been replaced, perform both the
Fresh Air/Zero calibration and the Span
calibration as discussed in sections 4.2
and 4.3.
5.7
Sample probe assembly
The MultiPro’s sample draw probe is the
standard probe assembly from Honeywell
Analytics. The illustration below gives a
breakdown of all parts in the sample draw
probe with part numbers. The sample probe
handle contains moisture barrier and
particulate filters designed to remove
contaminants that might otherwise harm the
instrument.
Sample probe filters should be replaced
whenever visibly discolored due to
contamination.
CAUTION:
Never perform remote sampling
without the sample probe and hose assembly.
The sample probe handle contains
replaceable filters designed to block moisture
and remove particulate contaminants. If the
pump is operated without the probe assembly
in place, contaminants may cause damage to
the pump, sensors and internal components of
the MultiPro.
Particulate contaminants are removed by
means of a cellulose filter. The hydrophobic
filter includes a Teflon
barrier which blocks
the flow of moisture as well as any remaining
particulate contaminants.
Summary of Contents for MultiPro
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