Dwyer Pressure Switch Explosion Proof | 1950P-2-2F
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Dwyer 1950P-2-2F Differential Pressure Switch
The Dwyer 1950P-2-2F is a reliable differential pressure switch designed for industrial monitoring and control. This explosion-proof switch operates in the 0.5 to 2 psi range, making it ideal for HVAC, filtration, and airflow safety applications. It is part of the durable 1950P Series from Dwyer Instruments.
Core Technical Specifications
- Manufacturer & Model: Dwyer 1950P-2-2F Differential Pressure Switch.
- Measurement Range: 0.5 to 2 psi differential pressure (psid).
- Switch Type: Single-pole, double-throw (SPDT) switch action.
- Connection Ports: 1/8" NPT Female (F) process connections.
- Housing Rating: Explosion-proof enclosure for hazardous environments.
- Deadband: Approximately 0.3 psi across the adjustable range.
Design & Application Features
- Enclosure: Robust, explosion-proof design meeting safety standards for Class I, Division 1 areas.
- Wetted Materials: Diaphragm and internal components suitable for clean, dry air and non-corrosive gases.
- Set Point Adjustment: External, calibrated dial for easy field adjustment of the trip point.
- Electrical Rating: Typically rated for 15A, 125/250V AC loads; verify with datasheet for specific loads.
- Mounting: Designed for panel or surface mounting in industrial settings.
- Application: Used for fan control, filter monitoring, duct pressure, and proving air flow.
Packaging & Shipping Information
- One Dwyer 1950P-2-2F Pressure Switch unit.
- Installation instructions and technical data sheet.
- Basic mounting hardware may be included.
- Fast global shipping via FedEx, UPS, and DHL services.
Professional FAQ
- What is a typical application for this differential pressure switch?
A common use is monitoring the pressure drop across an air filter. When the filter becomes clogged, the differential pressure increases. The 1950P-2-2F can be set to trigger an alarm or control panel at a specific pressure (e.g., 1.5 psid) to indicate the need for filter replacement.
- What does "explosion-proof" mean for installation?
The enclosure is designed to contain any spark or explosion that might occur internally from the switch contacts, preventing it from igniting flammable gases or dust in the surrounding hazardous atmosphere. It must be installed with properly rated conduit seals.
- How do I interpret the "0.3 psi deadband"?
Deadband (or differential) is the difference between the set point where the switch trips and the point where it resets. If set to trip at 1.5 psi, it might reset at 1.2 psi. This prevents rapid cycling (chattering) of the switch if the pressure hovers around the trip point.
- Can this switch be used with liquids?
The standard 1950P series is generally designed for clean, dry air and non-corrosive gases. Using it with liquids requires verification of material compatibility and may risk diaphragm damage. Consult Dwyer for liquid-rated models.
- How is the set point adjusted?
Using a small screwdriver, turn the external adjustment screw. A calibrated scale shows the approximate set point. Always verify the actual trip point under controlled conditions with a pressure calibrator or gauge for critical applications.
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