Description
Dwyer 1900-1MR Low Differential Pressure Switch Overview
The Dwyer 1900-1MR is a low differential pressure switch engineered for reliable detection and monitoring of pressure changes in air and non-combustible gas systems. With a setpoint range of 0.4″ w.c. to 1.6″ w.c., this switch is ideally suited for HVAC applications requiring precise, low-range pressure sensing — including filter status monitoring, fan and blower proving, and duct pressure control. The manual reset feature ensures that once a fault condition is detected, the system requires deliberate operator intervention before resuming operation, adding an important layer of safety and accountability to critical HVAC and building automation installations.
Key Features
- Setpoint range: 0.4″ w.c. to 1.6″ w.c.
- Manual reset operation — requires deliberate reset after trip event
- Compatible with air and non-combustible gases
- Compact, field-adjustable design for flexible installation
- Suitable for HVAC, building automation, and light commercial applications
- Dwyer 1900 Series proven reliability in differential pressure switching
Typical Applications
- Air filter clog and dirty filter detection
- Fan and blower airflow proving
- Duct static pressure monitoring
- Non-combustible gas pressure verification
- Building automation and HVAC control systems
Why Choose the Dwyer 1900-1MR
Dwyer Instruments has a long-standing reputation for precision instrumentation in the HVAC and industrial markets. The 1900 Series pressure switches are trusted by contractors and engineers for their accuracy, durability, and ease of installation. The manual reset configuration of the 1900-1MR makes it the preferred choice in applications where automatic restart after a fault is undesirable, helping to protect equipment and ensure system integrity.
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