Donaldson Torit DFT 2-8 - Magnehelic Gauge Installation

Donaldson Company, Inc.
30
Magnehelic Gauge Installation
Magnehelic Gauge
The Magnehelic is a differential pressure gauge used
to measure the pressure difference between the
clean- and dirty-air chambers and provides a visual
display of filter change requirements. The high-
pressure tap is located in the dirty-air plenum and
the low-pressure tap is located in the clean-air
plenum.
1. Choose a convenient, accessible location on or
near the unit for mounting that provides the best
visual advantage.
If unit is equipped with factory-installed pressure
taps, skip to Step 5.
2. Before drilling, place a piece of non-combustible
cloth over the filter opening in the clean-air
plenum to protect them from drilling chips.
3. Place a piece of wood behind the drill location in
the dirty-air plenum to protect the filters from
damage by the drill bit. Use a .406-inch diameter
bit to drill the holes as shown in Magnehelic
Gauge, Detail A.
4. Mount the pressure tap hardware on the clean-
air plenum panel. Mount the pressure tap with
the tee inside the dirty-air plenum.
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