Donaldson Torit DFO 3-6 Specifications download pdf (Page 30)

Donaldson Company, Inc.

Magnehelic Gauge, Detail A

Caution!

• Electrical installation must be

performed by a qualified electrician

and comply with all applicable

national and local codes.

• Turn power OFF during installation

or maintenance.

• Do not install in classified hazardous

atmospheres without an enclosure

rated for the application.

6. Mount the gauge and bracket assembly to the

supporting structure using two, self-drilling

screws.

7. Thirty-five feet of plastic tubing is supplied and

must be cut in two sections. Connect one

section of tubing from the gauge’s high-pressure

port to the pressure fitting located in the dirty-

air plenum. Connect remaining tubing from the

gauge’s low-pressure port to the fitting in the

clean-air plenum. Additional tubing can be

ordered from your representative.

8. Carefully remove the cloth protecting the

filters. Close access doors and tighten securely

by hand.

9. Zero and maintain the gauge as directed in the

manufacturer’s Operating and Maintenance

Instructions provided.

Photohelic Gauge

The Photohelic combines the functions of a

differential pressure gauge and a pressure-based

switch. The gauge function measures the pressure

difference between the clean- and dirty-air

chambers and provides a visual display of filter

condition. The high-pressure tap is located in the

dirty-air plenum and a low-pressure tap is located

in the clean-air plenum. The pressure-based switch

function provides high-pressure ON and low-

pressure OFF control of the filter cleaning system.

1. Choose a convenient, accessible location near

the unit that provides the best visual advantage.

2. Mount the gauge to the remote panel or door

using the mounting ring, retaining ring, and

four #6-32 x 1 1/4-in screws. Do not tighten

screws. Connect two, 1/8-in NPT x 1/4-in OD

male adapters to the gauge’s high- and low-

pressure ports. Align the adapters to the 2.375-in

hole in the right-hand side of the mounting

bracket. Tighten screws.

3. On the back of the gauge, remove four #6-32 x

5/16-in screws and plastic enclosure. Set aside.

Add two jumper wires supplied by customer.

Remove the jumper from the pressure switch

located on the timer board, if equipped. Using

the 3/4-in conduit opening, wire the gauge as

shown. Reassemble and fasten the enclosure

securely.

6.00

16.00

6.00

.406"

dia (2x)

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Donaldson Torit DFO 3-6 Specifications Page 30

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