Our highest precision conventional large diaphragm pressure switch provides maximum dependability. In addition, it incorporates a visible set point indicator for maximum convenience. UL and CSA listed, FM 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.
CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.
Service: Air and non-combustible,compatible gases.Wetted Materials: Consult factory.Temperature Limits: -30 to 110°F (-34.4 to43.3°C).Pressure Limits: 10 psig (68.95 kPa)continuous, 25 psig (172.4 kPa) surge.Switch Type: Single-pole double throw (SPDT).Repeatability: ±1%.Electrical Rating: 15 A @ 120-480 VAC, 60Hz. Resistive, 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz.Electrical Connections: 3 screw type,common, normally open and normally closed.Process Connections: 1/8″ female NPT.Mounting Orientation: Diaphragm in verticalposition. Consult factory for other position orientations.Set Point Adjustment: Screw type withenclosed scale.Weight: 4 lb 14 oz (2.21 kg).Agency Approvals: UL, CSA and FM.
| Model Number |
Description | |
|---|---|---|
| 1638-0 | Large diaphragm pressure switch, range0.05-0.25″ w.c., approx deadband @ 0.04 min. set point, 0.05 max. setpoint. | |
| 1638-1 | Large diaphragm pressure switch, range0.20-1.0″ w.c., approx deadband @ 0.04 min. set point, 0.06 max. setpoint. | |
| 1638-2 | Large diaphragm pressure switch, range1.0-3.0″ w.c., approx deadband @ 0.06 min. set point, 0.08 max. setpoint. | |
| 1638-5 | Large diaphragm pressure switch, range2.0-6.0″ w.c., approx deadband @ 0.07 min. set point, 0.25 max. setpoint. | |
| 1638-10 | Large diaphragm pressure switch, range3.0-12″ w.c., approx deadband @ 0.11 min. set point, 0.30 max. setpoint. |
OPTIONS:
- -MIL Environmental Construction. Unlisted Model 1635 can be furnished with a special snap switch sealed against the environment for high humidity, exposure to fungus, and/or for military applications. Similar to Model 1638 except dead band is slightly greater and some lower set points may not be available. Specify Model 1638-(range no.)-MIL and required set point in ordering.
- -WP 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 Model 1639-(range no.)-WP when ordering.
ACCESSORIES:
- A-465 – Flush mount space pressure sensor.
- A-301 – Static pressure tip, for 1/4″ metal tubing connection.
- A-302 – Static pressure tip, for 3/16″ and 1/8″ ID plastic or rubber tubing.
- A-303 – Portable static pressure tip, for 3/16″ ID rubber or plastic tubing with 3″ insertion.
- A-414 – 316 SS clean room pressure sensor.
- A-307 – Static pressure fitting, for 1/4″ metal tubing connection.
- A-308 – Static pressure fitting, for 3/16″ and 1/8″ ID plastic or rubber tubing.
- A-417 – Static pressure pickup, for use in clean rooms, 100 micron filter picks up static pressure, stainless steel wall plate fits 2″ x 4″ electrical box, sealed with foam gasket, screws included. Barbed brass fitting holds 1/8″ to 5/32″ ID tubing.
- A-418 – Static pressure pickup, room mount with Delta style plastic enclosure fits 2″ x 4″ electrical box, mesh screen hides static pressure pickup port, clean connection to 1/8″ to 5/32″ ID tubing and pressure sensor. Sealed with foam gasket, screws included.
- A-419 – Static pressure pickup ceiling mount, plate rests on top of standard 3/4″ thick ceiling tile while 100 micron filter faces down through 5/8″ hole in tile, screws included for optional mounting to junction box, barbed fitting holds 1/8″ to 5/32″ ID tubing.
- A-420 – Static pressure pickup for roof/outside mount, NEMA 4X (IP66) rated structure withstands harsh environmental elements, structure is 3-5/8″ across and 2-1/2″ deep, EMT conduit fitting is 1/2″, pressure connection is brass barbed fitting for 1/4″ tubing.
- A-306-A – Outdoor static pressure sensor, provides average outdoor pressure signal for reference in building pressurization applications, includes sensor, 50 ft vinyl tubing, mounting bracket and hardware.
- A-201 – Rubber tubing, 3/16″ ID, 9 ft length.
- A-202 – Rubber tubing, 3/16″ ID, lengths to 50 ft, per ft.
- A-203 – PVC tubing, 1/8″ ID x 1/4″ OD, per ft.
- A-210 – Aluminum tubing, 1/4″ OD, 5 ft length, 500 psi maximum pressure @ 200°F.
- A-211 – Aluminum tubing, 1/4″ OD, 50 ft length, 500 psi maximum pressure @ 200°F.
- A-220 – Flexible vinyl tubing, clear 3/16″ ID x 5/16″ OD, lengths to 500 ft, per ft, 45 psi maximum pressure @ 73°F.
- A-221 – Flexible vinyl tubing, clear 1/8″ ID x 3/16″ OD, lengths to 500 ft, per ft, 40 psi maximum pressure @ 165°F.
- A-222 – Flexible vinyl tubing, clear .240″ ID x .375″ OD, lengths to 500 ft, per ft, 35 psi maximum pressure @ 73°F.
- A-223 – Black polyethylene 1/8″ ID 1/4″ OD, 10 ft length, 200 psi maximum @ 140°F.
