Dwyer 1630 - Manual

O ur highest precision conventional large diaphragm
pressure switch provides maximum dependability. In addi-
tion it incorporates a visible set point indicator for maximum
convenience. U.L. and C.S.A. listed, F.M. approved for gen-
eral service, these switches are suitable for most applica-
tions in air conditioning and industrial service. Electrical
capability of 15 amps handles most small electrical loads.
Environmental (MIL) Construction. Unlisted Model 1635
can be furnished with special snap switch and silicone rub-
ber diaphragm for high humidity and/or for government
applications. Similar to standard Model 1638 except dead
band is slightly greater. Specify Model No. 1635 (range No.)
MIL in ordering. Example: 1635-5-MIL.
HOUSINGS FOR USE WITH MODEL 1638 SWITCH
(also suitable for Models 1626, 1627 and 1640 switches)
PHYSICAL DATA
Temperature Limits: -30°F (-34.4°C) for dry air or gas to 110°F
(43.3°C). (Consult factory for higher temperature applications.)
Maximum Surge Pressure: 25 psig.
Rated Pressure: 10 psig.
Pressure Connections:
1 /
8
″
NPT(F).
Electrical Rating: 15 amps, 120-480 volts, 60 Hz. A.C.
Resistive
1 /
8
H.P. @ 125 volts, 1/4 H.P. @ 250 volts, 60 Hz. A.C.
Wiring Connections: 3 screw type, common, normally open
and normally closed.
Set Point Adjustment: Screw type with enclosed scale.
Housing: 16 ga. steel, zinc plated, dichromate dipped for 200
hour salt spray test.
Diaphragm: Silicone rubber.
Calibration Spring: Stainless steel.
Weight: 4 lbs., 14 oz. (2.21 kg).
Installation: Diaphragm vertical.
MODEL 1638:
Operating Ranges, Dead Bands and Ratings.
U.L. and C.S.A. Listed, F.M. Approved.
Suggested Specification
Differential pressure switches shall be diaphragm operated
to actuate a single pole double throw snap switch. Motion
of the diaphragm shall be restrained by a calibrated spring
that can be adjusted to set the exact pressure differential at
which the electrical switch will be actuated. Motion of the
diaphragm shall be transmitted to the switch button by
means of a direct mechanical linkage. Set point adjustment
shall be screw type with set point indicated on a visual
scale. Switches shall be Dwyer Instruments, Inc. Catalog
No. 1638-_____ for the required operating ranges.
Series 1630 – Differential Pressure Switch
Specifications – Installation and Operating Instructions
Bulletin E-52
Model
Number
1638-0
1638-1
1638-2
1638-5
1638-10
Operating
Range
Inches,
W.C.
0.05 to 0.25
0.20 to 1.0
1.0 to 3.0
2.0 to 6.0
3.0 to 12
At Min.
Set Point
0.04
0.04
0.06
0.07
0.11
Approximate
Dead Band
At Max.
Set Point
0.05
0.06
0.08
0.25
0.30
Explosion-proof Housing
Killark cast alum. housing No. 4GRH with dome for No. 1638 switches and No.
GRH with flat cover for No. 1626 and 1627 switches rated for Class I, Group D;
Class II, Groups E, F and G and Class III. Approximate weight, 47 lbs. Specify
“EXPL” in addition to switch catalog number.
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]
8-7/8
[225.43] SQ
9-3/4
[247.65] TYP
10-7/8
[276.23] TYP
1-1/4
[31.75]
7-1/8
[180.98]
3-7/8
[98.43]
1/2 NPT
ELECTRICAL
CONNECTION
1/8 NPT HIGH
PRESSURE
CONNECTION
1/8 NPT LOW
PRESSURE CONNECTION
1-5/16
[33.34]
7
[177.80]
TYP
13-5/8
[346.08]
TYP
12
[304.80]
TYP 11
[279.4]
10-3/4
[273.05]
TYP
12
[304.80]
3/4
[19.05]
TYP
1/8 NPT LOW
PRESSURE
CONNECTION
BREATHER
1/8 NPT HIGH
PRESSURE
CONNECTION
Ø3/8 [9.53]
MOUNTING HOLES TYPE 4 PLACES
11-3/4
[298.45]
3-1/2
[88.90]
3/4
[19.05]
TYP
6
[152.40]
2-1/8
[53.98]
3/4 NPT
ELECTRICAL
CONNECTION
Weatherproof Housing
16 ga. steel enclosure for
unusually wet or oily con-
ditions. Withstands 200
hour salt spray test.
Gasketed cover. Weight,
20 lbs. Switch must be
installed at factory.
Specify “WP” in addition
to switch catalog.
Model 1638 pressure switch -
U.L. and C.S.A. listed F.M. approved
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