Single and Dual Pressure Switches- Series 1620
High reliability . . . repetitive accuracy within 1%
Our old faithful switch design is still best where highest precision combined with diaphragm sealed leak proof construction and mounting simplicity are required. Model 1626 and 1627 differential pressure switches are identical in design and construction except that Model 1626 has a single electric switch and Model 1627 has dual electric switches. Model 1627 can therefore provide dual control when required. It can be set to open or close two independent electrical circuits, each preset for its own actuation pressure. Both units have diaphragm sealed motion take outs providing maximum protection against leakage.
Environmental (MIL) Construction. Can be furnished with a special snap switch sealed against the environment for temperatures down to -65°F., high humidity, exposure to fungus, and/or for military applications. Dead band is slightly greater and some lower set points may not be available. Specify Model 1626 or 1627 - (Range No.) - "MIL" and required set point in ordering.
Weatherproof Housing
16-gallon 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 "WP7" in addition to switch catalog number.
Explosion-proof Housing
Killark cast aluminum housing No. GRH with flat cover for No. 1626 and 1627 switches rated for Class I, Group D; Class II, Group E,F and G and Class III. Approximate weight 47 lbs. Specify "EXPL" in addition to switch catalog number.
| Temperature limits: | -30°F for dry air or gas to 130°F |
|---|---|
| Maximum surge pressure: | 2 psig |
| Rated pressure: | 50 in. W.C. |
| Pressure connections: | 1/8" NPT |
| Electrical Rating: | 15 amps, 120-480 volts, 60 Hz A.C. Resistive, 1/8" H.P. @ 125 volts, ¼" H.P. @ 250 volts, 60 Hz A.C. |
| Wiring connections: | 3 screw type, each switch, common, normally open and normally closed |
| Housing: | 16 gallon steel, zinc plated, dichromate dipped for 200 hour salt spray test |
| Power diaphragm: | Silicone rubber with aluminum support plate |
| Sealing diaphragm: | Silicone rubber with aluminum support |
| Calibration spring: | Stainless steel |
| Weight: | Model 1626, 3 lbs., 9 oz.; Model 1627, 3 lbs., 10 oz. |
| Installation: | Diaphragm vertical |
CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.
| Model Number (1626 shown, 1627 similar) |
Operating Range Inches, w.c. |
Approx. Dead Band |
Adj. Dif. Between Set Points (1627 Only) |
|
|---|---|---|---|---|
| Min. | Max. | |||
| 1626-1 1626-5 1626-10 1626-20 |
.15 to 1.5 .5 to 6.0 2.0 to 11 8.0 to 24 |
.10 .15 .25 .50 |
.20 .35 .65 1.20 |
.05 1.2 2.3 5.0 |
SUGGESTED SPECIFICATIONS
Differential pressure switches shall be diaphragm operated to actuate a single pole double throw snap switch (or two SPDT snap swtiches for Model No. 1627). Motion of the diaphragm shall be restrained by a calibrated spring that can be adjusted to set the exact presure 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. Switches shall be Dwyer Instruments, Inc. Catalog No. ____ for the required operating ranges.