Downo Workstation, DWST 4-1 to 6-4
A16
Photohelic Gauge Installation
Electrical installation, service, or maintenance work must be performed by a qualied electrician and comply with all
applicable national and local codes.
Turn power off and lock out all power before performing service or maintenance work.
Do not install in classied hazardous atmospheres without an enclosure rated for the application.
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 ambient air and provides a visual display of lter condition. The low-
pressure tap is located in the clean-air plenum on the back of the cabinet. The pressure-based switch function provides high-
pressure ON and low-pressure OFF control of the lter cleaning system.
1. Choose a convenient, accessible location on or near the collector for mounting 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 one 1/8-in NPT x 1/4-in OD male adapter to the low-pressure port of the gauge. Leave high-pressure
port open to the atmosphere. Align the adapter to the 2.375-in hole in the right-hand side of the mounting bracket. Tighten
screws.
3. Zero and maintain the gauge as directed in the manufacturer’s Operating and Maintenance Instructions provided.
Photohelic
®
Gauge
mounting bracket
#6-32 x 1/4-in
mounting screws
support structure
mounting surface
Photohelic gauge
high pressure port
low pressure port
1/8-in NPT adapter
plastic tubing
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