Dwyer Instruments 1900-5MR Differential Pressure Switch WC - 1.4-5.5

The Dwyer Instruments 1900-5MR is a differential pressure switch designed for reliable monitoring and control of HVAC systems, cleanrooms, and filtration applications. This switch activates when differential pressure reaches the setpoint range of 1.4 to 5.5 inches water column, making it ideal for filter monitoring and air flow control applications.

Key Features:

• Adjustable setpoint range: 1.4 to 5.5 inches water column
• Manual reset (M/R) operation ensures positive acknowledgment of alarm conditions
• Single-pole, double-throw (SPDT) switch output for versatile control options
• Durable construction suitable for industrial and commercial HVAC applications
• Simple installation with dual pressure port connections
• Reliable switching mechanism for long service life

The manual reset feature requires user intervention to reset the switch after an alarm condition, preventing automatic reset that could mask ongoing problems. This makes the 1900-5MR particularly valuable for critical applications where filter changes or system maintenance must be acknowledged before resuming normal operation.