Dwyer 43000 - Manual (Page 2)

INSTALLATION
1. Location: All parts of the Capsu-Photohelic ® pressure switch/gage
are ruggedly constructed and will stand a moderate amount of vibration, physical
shock and handling. Normal care in handling and installation is all that is
required. In cases where instrument panel vibration is severe, the panel should
be mounted or the amplifier-relay unit mounted remotely 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.
See accessory Bulletin S-101 for fittings.
2. Position: The Capsu-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.
All standard units are calibrated for use with the diaphragm and scale in a
vertical position. Special factory calibration is available for applications requiring
inclined or horizontal positions. The exceptions are ranges under 5 in w.c. which
are only available for vertical installation.
3. Mounting: The Capsu-Photohelic ® is normally mounted before making
electrical connections, as the electrical enclosure is independent of the mounting
means and may be removed at any time.
A. Panel Mounting: Normal mounting is flush or through panel as shown in
Figure 2. Be sure to allow 4-3/8˝ extra space behind the unit for electrical
enclosure removal. Make a single 4-13/16˝* diameter hole in the panel.
Insert the entire Capsu-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) 1-1/4˝ 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.
B. Gage Mounting with Relay Package Remote: Where it is preferred to
install the amplifier-relay unit separate from the gage, (usually due to
space limitations) the gage may either be panel mounted as shown in
Figure 2 or surface mounted as in Figure 3A. For surface mounting, use
the hole layout in Figure 3B.
C. Remote Relays Mounting: The amplifier – relay unit may be mounted remotely
as shown in Figure 4A. Use the hole layout as shown in Figure 4B for this option.
Additional mounting information for special requirements is available from the
factory.
When the gage is surface mounted, two 1/4˝ diameter holes
must be located as shown for blow-out protection. This assures
that if the gage is overpressured, thus causing a failure, pressure will be safely
vented out the back. Failure to keep these holes clear could result in personal injury
and/or property damage since the excessive pressure could be forced into the front
cover which would then blow off.
CAUTION
A: Surface Mounting
ш4-1/8
[103.58]
Ш4-3/8
[110.33]
7/8˝ DIA. HOLE
(2) 1/4 DIA. HOLES FOR
BLOWOUT PASSAGE
42° TYP.
(2) HOLES
35° TYP.
(4) HOLES
(4) 3/16 DIA. HOLES
B: Hole Layout (Front)
Figure 3
A: Remote Amplifier-Relay Unit
4-9/32
[108.74]
5
[127.00] SQ
4-9/32
[108.74]
ø3/16
TYP 4 PLACES
B: Hole Layout
Figure 4
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