Field Instruments

Product Overview

The Dwyer 1910-20 is a compact low-differential pressure switch from Dwyer’s Series 1900, designed to monitor small pressure differences in air or compatible gases. With an adjustable set point and reliable SPDT switching action, the 1910-20 is well-suited for applications such as HVAC systems, filter monitoring, ventilation control, and industrial air-flow or pressure drop detection. Its compact size and robust construction ensure reliable operation in a variety of environments.

Key Features

• Compact low-differential pressure switch — small size for easy installation in tight spaces

• Differential pressure range: 4.0 to 20.0 in. w.c. (water column) — suitable for air-flow, duct pressure, filter monitoring, and similar low-pressure applications

• Built-in SPDT (single-pole double-throw) switch for control or alarm functions

• Internal set-point adjustment screw (protected inside enclosure) — set point can be finely tuned and protected against tampering

• 1/8″ female NPT process connections for easy integration with standard tubing/piping

• Durable enclosure and components for repeated cycling and long service life

• Simple wiring with screw-type terminals (common, normally open, normally closed) for easy installation and maintenance

Technical Specifications

Brand: Dwyer Instruments
Model / Part Number: 1910-20 (Series 1900)
Type: Compact Low Differential Pressure Switch

Pressure Type: Differential (measures difference between two sides)
Set-point Range: 4.0 – 20.0 in. w.c. (water column)
Switch Type: SPDT (Single-Pole Double-Throw)
Process Connections: 1/8″ female NPT (two ports for differential measurement)
Electrical Rating: 15 A @ 120-480 VAC (resistive load)
Switch Output: Normally Open (NO) / Normally Closed (NC) — selectable via wiring
Repeatability: ± 3% of set point
Construction: Compact, rugged housing; internal set-point adjustment screw for reliable and tamper-resistant setting
Mounting Orientation: Diaphragm ideally vertical (per manufacturer recommendation)
Typical Applications: Air-flow control, HVAC duct monitoring, filter pressure drop detection, ventilation systems, industrial air handling, and any system requiring low-pressure differential monitoring

Applications & Use Cases

• Monitoring differential pressure across air filters / ducts to detect clogging or reduced airflow

• Control or alarm of ventilation, HVAC, or air-handling systems based on pressure differentials

• Detecting pressure loss or flow change in air or inert-gas lines

• Use in buildings, commercial HVAC installations, clean rooms, laboratories, or industrial air-handling systems

• Retrofits or OEM applications where compact and affordable pressure-switch solutions are required

Why Buy from FieldInstruments.lk

• We supply 100% genuine Dwyer Instruments products — ensuring original factory quality and performance standards.

• Fast and reliable delivery across Sri Lanka — directly to your site, plant, or project location.

• Competitive pricing with transparent sourcing — ideal for both small-scale orders and bulk procurement.

• Local technical support and after-sales service — helping with selection, installation guidance, and configuration advice.

• Trusted supplier for industrial instrumentation and HVAC/process control equipment — with experience serving clients in manufacturing, HVAC, water treatment, and facility-management sectors.

Fieldinstruments.lk
50/3, Angampitiya Rd, Ethul Kotte, Sri Lanka. 10100.
Phone: +94718555888 Email: info@fieldinstruments.lk