A15
Donaldson Company, Inc.
Optional Equipment
Magnehelic
®
Gauge
The Magnehelic is a differential pressure gauge used to measure the pressure difference between the clean-air and dirty-air
plenums 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 collector for mounting that provides the best visual advantage.
2. Plug the pressure ports on the back of the gauge using two, 1/8-in NPT pipe plugs supplied. Install two, 1/8-in NPT male
adapters supplied with the gauge into the high- and low-pressure ports on the side of the gauges.
3. Attach the mounting bracket using three, #6-32 x 1/4-in screws supplied.
4. Mount the gauge and bracket assembly to the supporting structure using two, self-drilling screws.
5. Thirty-five feet of plastic tubing is supplied and can be cut as needed. Connect tubing from the gauge’s low-pressure port to
the fitting in the clean-air plenum. Leave high-pressure port open to the atmosphere. Additional tubing can be ordered from
your representative.
6. Zero and maintain the gauge as directed in the manufacturer’s Operating and Maintenance Instructions provided.
Magnehelic Gauge Installation
support structure
mounting surface
#6-32 x 1/4-in mounting screws
mounting bracket
two, self-drilling screws
two, 1/8-in NPT pipe plugs
plastic tubing
two, 1/8-in NPT
adapters
low-pressure port
high-pressure port
Magnehelic gauge
