Bulletin E-52
Series 1630 – Differential Pressure Switch
Specifications – Installation and Operating Instructions
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ADJUSTABLE |
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RANGE SPRING |
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Ø9/32 [7.14] |
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DIAPHRAGM |
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MOUNTING HOLE |
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CONDUIT |
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TYP 4 PLACES |
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ENCLOSURE |
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Ø7-3/4 |
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[196.85] |
4 |
3 |
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8-3/16 |
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[207.96] |
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[101.60] [76.20] |
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SCREW TYPE |
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TYP |
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ELECTRICAL |
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ADJUSTMENT |
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TERMINALS |
SCREW |
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TYP 3 PLACES |
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2 |
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SPDT SNAP |
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1/2 |
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SWITCH |
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[50.80] |
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1/2 |
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[12.70] |
TYP |
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CONDUIT |
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TYP. |
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CONNECTION |
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3 |
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[76.20] |
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Model 1638 pressure switch - |
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6-1/2 |
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1/8 NPT(F) LOW |
[165.10] |
1/8 NPT(F) HIGH |
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U.L. and C.S.A. listed F.M. approved |
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PRESSURE CONNECTION |
PRESSURE CONNECTION |
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Our highest precision conventional large diaphragm pressure switch provides maximum dependability. In addition it incorporates a visible set point indicator for maximum convenience. U.L. and C.S.A. listed, F.M. approved for general service, these switches are suitable for most applications 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 rubber 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)
Weatherproof Housing
16 ga. steel enclosure for unusually wet or oily conditions. Withstands 200 hour salt spray test. Gasketed cover. Weight, 20 lbs. Switch must be installed at factory. Specify “WP” in addition to switch catalog.
1/8 NPT LOW
PRESSURE CONNECTION
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1/8 NPT HIGH |
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PRESSURE |
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1-5/16 |
CONNECTION |
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[33.34] |
1/2 NPT |
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7 |
ELECTRICAL |
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CONNECTION |
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[177.80] |
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TYP |
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8-7/8 |
1-1/4 |
3-7/8 |
[225.43] SQ |
[31.75] |
[98.43] |
9-3/4 |
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7-1/8 |
[247.65] TYP |
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[180.98] |
10-7/8 |
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[276.23] TYP |
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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.
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Ø3/8 [9.53] |
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MOUNTING HOLES TYPE 4 PLACES |
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3/4 NPT |
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ELECTRICAL |
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13-5/8 |
1/8 NPT HIGH |
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CONNECTION |
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[346.08] 12 |
PRESSURE |
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TYP [304.80] |
CONNECTION |
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2-1/8 |
6 |
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TYP 11 |
BREATHER |
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[53.98] [152.40] |
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[279.4] |
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1/8 NPT LOW |
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10-3/4 |
PRESSURE |
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CONNECTION |
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3/4 |
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[273.05] |
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3/4 |
3-1/2 |
[19.05] |
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TYP |
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[19.05] |
TYP |
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[88.90] |
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12 |
TYP |
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11-3/4 |
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[304.80] |
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[298.45] |
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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.
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Operating |
Approximate |
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Range |
Dead Band |
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Model |
Inches, |
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At Min. |
At Max. |
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Number |
W.C. |
Set Point |
Set Point |
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1638-0 |
0.05 to 0.25 |
0.04 |
0.05 |
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1638-1 |
0.20 to 1.0 |
0.04 |
0.06 |
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1638-2 |
1.0 to 3.0 |
0.06 |
0.08 |
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1638-5 |
2.0 to 6.0 |
0.07 |
0.25 |
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1638-10 |
3.0 to 12 |
0.11 |
0.30 |
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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.
DWYER INSTRUMENTS, INC. |
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Phone: 219/879-8000 |
www.dwyer-inst.com |
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P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A. |
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Fax: 219/872-9057 |
e-mail: info@dwyer-inst.com |
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Lit-by-Fax: 888/891-4963 |
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