Dwyer Series 1831-1-ra-s Low Differential Pressure Switch

US $115.00

Seymour, Tennessee, United States
Jun 9th

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The Dwyer 1831 Series differential pressure switches are available with a DPDT switch and manual reset. The 1831 combines small size with 4% set point repeatability. Absolutely no power is required to operate the DPDT switch. Set point adjustment on the switch is easily accessible for modifying the set point. The 1831 Series DPDT low differential pressure switches with manual reset eliminate common problems associated with typical high duct static cutout installations. Since the 1831 requires absolutely no power to drive its outputs, a separate power loop and its associated additional wiring and conduit is alleviated, reducing material and labor installation costs. Both control contacts of the 1831 Series activate at the same time. The potential of the lead switch shutting down the fan preventing the lag switch from sending an alarming signal to the DDC is no longer a probable system liability. Potential costly maintenance calls are diminished. Unlike typical switches that posses only a single conduit entry for both control loops, the 1831 Series provides two conduit connections simplifying wiring while eliminating additional conduit tees. The 1831 Series' specifications and features make it the superior choice for high duct static cutout applications. MANUAL RESET OPERATION - ACTIVATE ON INCREASE Models with “manual reset” are DPDT configuration and operate as follows: If differential pressure increases above the set-point, the snap switch is actuated or latched so N.O. contacts are closed and N.C.contacts are open. They will remain in that condition even if differential pressure decreases below the set-point until manually deactuated by reset leaver. SET POINT THRESHOLD CHECK: The reset lever can act as a test feature during system installation or maintenance, even if set point threshold is not exceeded. A periodic lever override is recommended to ensure proper switch performance.Pushing the lever to the right (when viewed from the cover side of the switch with the ports pointed down) will cause the switch to change state,simulating a condition in which the set point threshold has been exceeded. The lever then must be manually reset, pushing the lever to the left to deactuate the switches to complete the override procedure. SPECIFICATIONS Service: Air and non-combustible, compatible gases. Environment: Intended for indoor use. Wetted Materials: Consult factory. Temperature Limits: -30 to 180°F (-34.4 to 82.2°C). Pressure Limits: 10 psig (68.95 kPa) continuous; 25 psig (172.4 kPa)surge. Humidity Limits: 80% RH (non-condensing). Altitude Limits: 6560 ft (2000 m) max. Switch Type: 2 SPDT. Actuation Time Difference: 1 millisecond maximum actuation delay between contacts. Repeatability: ±4% max of setpoint. Electrical Rating: 4A resistive @ 125/250 VAC (~); 50/60 Hz. 3A inductive 30 VDC ( ); 5A resistive 30 VDC ( ). Electrical Connections: Screw type terminal block. Installation Category: II (transient over-voltage). Process Connections: 1/8? female NPT. Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations. Mounting bracket included. Set Point Adjustment: Screw type inside mounting spud. ONE YEAR WARRANTY FROM DATE OF PURCHASE

Condition:	New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...	Brand	Dwyer Instruments
MPN	1831-1-RA-s
Model	1831-1-RA-S
Country/Region of Manufacture	United States