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14 Maintenance
The MultiRAE requires little maintenance, aside from replacing sensors, the filter, and the battery. If the
instrument is equipped with a pump, it may need replacement, as well. If the instrument has a PID, then
the PID sensor lamp and sensor electrode panel may require periodic cleaning.
14.1 Removing/Installing The Rubber Boot
In order to open the MultiRAE, it is necessary to remove the belt clip and the rubber boot. Note that there
are two hex screws on the bottom rear side that secure the boot.
1. Remove the belt clip by unscrewing the Philips screw (pumped version only).
2. Remove the two hex screws located below the battery area.
3. Pull the bottom of the boot back over the rear side of the instrument.
4. Carefully slide the boot upward, and slide it over the D-ring and clamp.
14.2 Replacing The Filter(s)
Pumped Version
If a filter is dirty or clogged, remove it by unscrewing it from the black gas inlet adapter. Discard it and
replace it with a new filter. Perform a pump stall test to make sure the inlet and the external filter are
installed properly so that there are no leaks in the system.
Diffusion Version
If the filters appear dirty, remove the sensor compartment cover to access them (this requires removing the rubber
boot first).
Remove the four screws
holding the sensor
compartment cover in
place.
Remove the O-rings and then remove the filters.
Replace them with new filters (press around the
perimeter of each to ensure that the adhesive
holds them firmly) and install the O-rings in
their proper locations. O-rings may need to be
replaced as well if they appear worn down,
cracked, or dirty
Replace the sensor
compartment cover and
tighten the four screws.
