Gas Pressure Switches- Series 1990
A high-precision, compact, low cost switch with 2" to 20"W.C. range.
Reliable and convenient, the 1996-20 Gas Pressure Switch serves as a compact, low cost switch for gas fired furnaces and equipment. The wide 2" to 20" pressure range is ideal for a high or low gas pressure interlock. Visible set point and on-off indicators add convenience in servicing. Use either NO or NC contacts on SPDT switch. Bottom connection has both 1/8" female and ¼" male threads for pipe nipple or coupling. Top connection vents diaphragm chamber to outside or to furnace combustion chamber. Used with natural, manufactured or LP gas
| Temperature Limits: | 32°F (-30°F for dry gas or air) to 110°F |
|---|---|
| Max. surge pressure: | 10 psig |
| Rated pressure: | 45 in. W.C. |
| Pressure connection: | 1/8" NPT female or ¼" NPT male |
| Vent connection: | 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, common, normally open and normally closed |
| Weight: | 2 lbs. net |
| Installation: | Mercury switch unit - vertical, snap switch unit - any position |
| INCHES W.C. | ||
|---|---|---|
| Set Point | Dead Band | Reset Point |
| 2 5 10 15 20 |
.4 .4 .5 .5 .6 |
1.6 4.6 9.5 14.5 19.4 |
Suggested Specifications
Gas Pressure switches shall be diaphragm operated with 3 ½" diaphragm 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. Visible set point and on-off indicators shall be incorporated in the switches. 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. 1996-20.