Dwyer 1630 - Manual (Page 2)

INSTALLATION
1. Select a location free from excessive vibration where oil
or water will not drip on the switch and where ambient tem-
perature will be within a range of -30°F (-34.4°C) (dry air or
gas) to 110°F (43.3°C). See special housing for unusual
requirements and MIL option for high humidity.
2. MOUNT THE SWITCH WITH THE DIAPHRAGM IN A
VERTICAL PLANE. The switch is position sensitive so it
must be recalibrated for each change in operating position.
3. Connect switch to source of air pressure differential.
Metal tubing with 1/4
″
O.D. is recommended, but any tub-
ing system which will not restrict the air flow is satisfactory.
4. Electrical connections for all switches are marked
Common, Normally Open and Normally Closed. Be certain
connections are properly made and that no mechanical load
can be transferred from the wiring to the snap switch.
ADJUSTMENT AND CALIBRATION
1. The calibration or actuation point of the switch is indicat-
ed on the scale secured to the transparent range spring
enclosure. Recalibration to another setting within the range
of the switch is readily accomplished by turning the adjust-
ment screw, counter-clockwise to increase the pressure
setting or clockwise to decrease the setting. Note that the
indicated calibration is correct only if the switch is mounted
with the diaphragm assembly in a vertical plane. If mounted
in any other position, the switch must be recalibrated as fol-
lows:
a. Using a “T” assembly with three rubber tubing leads, all
as short as possible and offering minimum flow resistance,
run one lead to the pressure switch and the second lead to
a manometer of appropriate range and known accuracy.
Apply pressure through the third tube, preferably by suc-
cessively pinching the tube tight with the fingers. Pinch off
the tube and make the final approach to the set point slow-
ly. Check the set point by listening for the click of the switch
or by using a volt meter.
b. Note that the manometer and pressure switch will have
different response characteristics due to their different inter-
nal volumes, lengths of tubing, fluid drainage, etc. Be cer-
tain that the switch is checked in the position it will assume
in use, or preferably, that it is installed in its final location and
then checked. When pressure reading has been estab-
lished, replace scale to proper position, relating set point
indicator to markings on scale.
Bulletin E-52
Page 2
©Copyright 2001 Dwyer Instruments, Inc. Printed in U.S.A. 1/01 FR# 23-440200-00 Rev.1
DIAPHRAGM
1/2
[12.70]
TYP.
ADJUSTMENT
SCREW
2
[50.80]
TYP
3
[76.20]
6-1/2
[165.10]
1/8 NPT(F) LOW
PRESSURE CONNECTION
1/8 NPT(F) HIGH
PRESSURE CONNECTION
1/2
CONDUIT
CONNECTION
SPDT SNAP
SWITCH
SCREW TYPE
ELECTRICAL
TERMINALS
TYP 3 PLACES
8-3/16
[207.96]
Ø7-3/4
[196.85]
CONDUIT
ENCLOSURE
ADJUSTABLE
RANGE SPRING
Ø9/32 [7.14]
MOUNTING HOLE
TYP 4 PLACES
3
[76.20]
TYP
4
[101.60]
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Lit-by-Fax: 888/891-4963