Dwyer 1900 Series Compact Low Differential Pressure Switches

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Dwyer 1900 Series Compact Low Differential Pressure Switches Specification

Function
Differential Pressure Sensing & Switching

Thread size
1/8 female NPT connection

Mechanical Life
>1,000,000 cycles

Working Temperature
-20 to 85 C

Max Pressure
10 psig (0.69 bar)

Product Type
Low Differential Pressure Switch

Max. Current
15 A @ 125, 250 or 480 VAC

Max. Power
1/8 HP, 125 VAC

Max. Voltage
480 VAC

Protection Class
IP54 (with cover) or open type

Pressure Range
0.07 to 20 w.c. (17.4 to 4,982 Pa)

Application
HVAC, air handlers, filter monitoring, duct static pressure, fan and blower equipment

Output Signal
SPDT snap switch

Size
2-1/2 diameter x 2-1/4 depth (approx.)

Color
Grey/Silver

Weight
Approx. 184 g

Dwyer 1900 Series Compact Low Differential Pressure Switches Trade Information

Payment Terms
Cash on Delivery (COD), Cash Against Delivery (CAD), Cash in Advance (CID), Cheque, Cash Advance (CA)

Main Export Market(s)
North America, Eastern Europe, Western Europe, Middle East, Africa, Central America, South America, Asia, Australia

Main Domestic Market
All India

About Dwyer 1900 Series Compact Low Differential Pressure Switches

Dwyer 1900 Series Compact Low Differential Pressure Switches

For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20" w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure and prevents tampering. UL, CE and CSA listed, and FM approved.

Dwyer 1900 Series Offers

Features

Oversized check valves for smooth controlled operation
Mash proof vent valve (no needle valve)
Patented non-oil based lubricants used on all moving parts
Dual O-rings on all pistons to ensure zero leakage

Applications

Air conditioning refrigeration coil icing detection; defrost cycle initiation
Clogged filter detection
Variable air volume controller

Compact and Robust Design

The Dwyer 1900 Series boasts a compact sizejust 2-1/2 diameter and 2-1/4 deepmaking it ideal for installations with limited space. The die-cast aluminum enclosure enhances durability, while the IP54 protection rating ensures resilience in demanding environments.

Versatile Set Point Adjustment

A screw-accessible calibration mechanism located on the switchs top allows technicians to finely adjust the set point in the field with ease. This supports application flexibility and ensures accurate switching at the desired differential pressure.

Wide Application Scope

Engineered for HVAC, air handlers, filter condition monitoring, duct static pressure measurement, and fan or blower systems, the 1900 Series meets the needs of manufacturers, suppliers, traders, and wholesalers throughout India.

FAQs of Dwyer 1900 Series Compact Low Differential Pressure Switches:

Q: How is the set point adjusted on the Dwyer 1900 Series pressure switch?

A: Set point adjustment is achieved by accessing the calibration screw on the top of the unit. This enables users to calibrate the switch in the field, ensuring precise activation at the desired differential pressure.

Q: What mounting orientation is required for optimal performance?

A: The 1900 Series is designed to be installed vertically, with the pressure ports facing downward. This orientation helps maintain measurement accuracy and consistent performance.

Q: When should I consider using the automatic versus manual reset options?

A: Automatic reset models are ideal for applications requiring unattended operation, where the switch should reset after condition normalization. Manual reset is recommended when a physical intervention is preferred for safety or compliance reasons.

Q: Where can the Dwyer 1900 Series switches be used?

A: These switches are commonly implemented in HVAC systems, air handling units, filter monitoring, duct static pressure control, and fan or blower equipment, making them versatile for various industrial or commercial environments.

Q: What is the benefit of the SPDT snap switch output?

A: An SPDT snap switch provides a quick and clear changeover between contacts, supporting reliable control or signaling in monitoring schemes. This kind of output is particularly beneficial for automatic system responses and alarm integration.

Q: How do the integral 1/8" NPT ports simplify installation?

A: The integral 1/8" NPT female high and low ports provide direct, secure connections to process lines or pressure sources, facilitating straightforward installation and reducing the need for additional fittings.

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