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TEMPCO s.a. 4e ave. N°114, Z.I. des Hauts Sarts, B-4040 Herstal, Belgique. T:(32)04-2649458, F:(32)04-2649476, www.tempco.be, [email protected]
Les photos et caractéristiques présentés dans ce catalogue sont données à titre indicatif et ne sont pas contractuelles.
3.A.01.450-E-100910 page 2/7
INSTALLATION
1. Location
All parts of the Dwyer Photohelic
®
pressure switch/gage are
ruggedly constructed and will stand a moderate amount of
vibration, physical shock, and handling. Normal care in han-
dling and installation is all that is required. In cases where
instrument panel vibration is severe, the panel should be a
spring mounted or the amplifier-relay unit mounted remote-
ly on a more stable surface.
Select a location where the ambient temperature will not
exceed 120°F. Pneumatic pressure sensing lines may be run
any necessary distance. For example, 250 foot sensing lines
will not affect accuracy but will damp the reading slightly. Do
not restrict lines. If pulsating pressure or vibration causes
excessive pointer oscillation or relay chatter, consult factory
for additional damping means.
2. Position
The Photohelic
®
may be mounted as an integral package or
the amplifier-load relay assembly and housing may be
mounted remotely from the indicating gage-phototransistor
unit. Extension cords with 7 pin plugs and receptacles are
available from Dwyer for interconnection of the two units.
The unit may be mounted in any desired position, scale ver-
tical or horizontal, without affecting its accuracy, but must
be rezeroed if position is changed from horizontal to vertical
or vice versa. The -0 and -00 models must be mounted with
the scale vertical.
3. Mounting
The Photohelic
®
is normally mounted before making electri-
cal connections, as the electrical enclosure is independent
of the mounting means and may be removed at any time.
Panel Mounting
Normal mounting is flush or through panel is shown in Fig.
2. Be sure to allow 4-3/8˝ extra space behind the unit for
electrical enclosure removal. Make a single 4-13/16˝ diame-
ter hole in the panel. Insert the entire Photohelic® unit from
the front, then slip on the mounting ring and snap ring from
the rear. Seat the snap ring in its groove, back up the
mounting ring against snap ring and tighten the four (4) 2˝
No. 6-32 clamp screws provided. If behind panel space is
critical, the amplifier-relay unit can be mounted remotely.
See the Remote-Relay Mounting Instructions for details.
Fig. 2
SNAP RING GROOVE
4-13/16˝ (122 mm)
DIA. HOLE REQUIRED
FOR PANEL MOUNTING
1/8˝ MALE NPT PRESSURE CONNECTIONS.
SINGLE HIGH PRESSURE CONNECTION
FOR SERIES 36000A MODELS.
Through Panel Mounting
