Checking The Pump Inlet Filter; Replacing The Filters; Dust And Water Filter; Caution - MSA Orion plus Manual De Operación

holes for four sensors. In instruments with less than four
sensors, some of the holes are permanently blocked with
special sealing membranes. Do not puncture these mem-
branes; erroneous gas readings can result.

Checking The Pump Inlet Filter

Orion plus Multigas Detectors ordered with the internal pump contain a
filtering system to protect the pump from particles and water in the
sample air. If the filter becomes clogged, the sample flow may be
blocked, or and extra load may be placed on the pump; therefore, check
the filter regularly.
The frequency of checks should depend on amount of pump usage and
concentration of particles allowed to enter the pump. In dirty
applications, replace the dust filter every 200 hours.

Replacing the Filters

When replacing external dust and water filters, prevent
dust or dirt around the filter housing from entering the
pump housing. Dust or dirt in the pump unit may impede
pump operation.
Dust and Water Filter (see FIGURE 8-2 and TABLE 8-2)
1. Remove the four screws (24) from the clear filter housing (23) on
the back of the instrument.
2. Remove fibrous filter (21) from the recess on filter housing.
3. Carefully install the new filter in the filter housing recess.
4. Re-install the filter housing.
NOTE: When replacing filter, carefully handle new filter by the
edges only, as it is easily torn. Install filters in correct order.
4. Replace the O-ring, being sure to press gently down on top of the
water filter.
5. Replace the cover and screws.

" CAUTION

any
6-3