Dwyer Instruments 1950-20-2F Pressure Switch
The Dwyer Instruments 1950-20-2F Pressure Switch is a trade-standard solution for monitoring differential pressure in hazardous locations. Engineered as an explosion-proof alternative to the Series 1900, this unit integrates a weatherproof housing that meets NEMA 3, 7, and 9 ratings. With an adjustable range of 4 to 20" w.c. and a tight deadband of 0.40 to 0.60, it provides precise control for HVAC systems, fan proof-of-flow, and filter monitoring. The SPDT switch is rated for 15A at up to 480VAC, making it compatible with high-voltage industrial interlocks. Designed for air and non-combustible gases, the 1950-20-2F features a 1/8" female NPT process connection and an external set point screw for streamlined field calibration. Its compact, lightweight aluminum construction simplifies installation in tight mechanical spaces while maintaining UL, CSA, and FM approvals for Class I, II, and III environments.
Key Benefits for Technicians- Hazardous Location Protection: Certified for Class I, Div 1 (Groups C & D) and Class II (Groups E, F, G) environments, ensuring explosion-proof safety in industrial settings.
- Simplified Field Calibration: Features an external set point screw, allowing for precise adjustments without the need to disassemble the weatherproof housing.
- High Electrical Capacity: The heavy-duty SPDT snap switch handles up to 15A, providing reliable switching for motors, alarms, and low pressure control circuits.
- Compact Footprint: Approximately half the weight and bulk of conventional hazardous location pressure switches, ideal for crowded ductwork and panels.
- All-Weather Reliability: Dual-rated weatherproof and explosion-proof enclosure with an O-ring seal and drain plug for outdoor or wash-down applications.
What is the proper mounting orientation for the 1950-20-2F?
Standard calibration is performed with the diaphragm in a vertical position. For the best accuracy and to ensure the differential pressure switch maintains its specified set point, always mount the unit vertically unless specifically calibrated otherwise by the factory.
Is this switch compatible with natural gas or combustible media?
This specific model is designed for air and non-combustible, compatible gases. For applications involving natural gas or other combustible media, the 1950G series is generally the required alternative to ensure safe venting and material compatibility.
How do I wire the SPDT switch for fan status monitoring?
The internal SPDT switch includes three screw terminals: Common (COM), Normally Open (NO), and Normally Closed (NC). For a typical "proof-of-flow" interlock, wire to the NO terminal; the circuit will close once the static pressure rises above your set point.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $376.62
-65%$376.62
$131.82Dwyer Instruments 1950-20-2F Pressure Switch
The Dwyer Instruments 1950-20-2F Pressure Switch is a trade-standard solution for monitoring differential pressure in hazardous locations. Engineered as an explosion-proof alternative to the Series 1900, this unit integrates a weatherproof housing that meets NEMA 3, 7, and 9 ratings. With an adjustable range of 4 to 20" w.c. and a tight deadband of 0.40 to 0.60, it provides precise control for HVAC systems, fan proof-of-flow, and filter monitoring. The SPDT switch is rated for 15A at up to 480VAC, making it compatible with high-voltage industrial interlocks. Designed for air and non-combustible gases, the 1950-20-2F features a 1/8" female NPT process connection and an external set point screw for streamlined field calibration. Its compact, lightweight aluminum construction simplifies installation in tight mechanical spaces while maintaining UL, CSA, and FM approvals for Class I, II, and III environments.
Key Benefits for Technicians- Hazardous Location Protection: Certified for Class I, Div 1 (Groups C & D) and Class II (Groups E, F, G) environments, ensuring explosion-proof safety in industrial settings.
- Simplified Field Calibration: Features an external set point screw, allowing for precise adjustments without the need to disassemble the weatherproof housing.
- High Electrical Capacity: The heavy-duty SPDT snap switch handles up to 15A, providing reliable switching for motors, alarms, and low pressure control circuits.
- Compact Footprint: Approximately half the weight and bulk of conventional hazardous location pressure switches, ideal for crowded ductwork and panels.
- All-Weather Reliability: Dual-rated weatherproof and explosion-proof enclosure with an O-ring seal and drain plug for outdoor or wash-down applications.
What is the proper mounting orientation for the 1950-20-2F?
Standard calibration is performed with the diaphragm in a vertical position. For the best accuracy and to ensure the differential pressure switch maintains its specified set point, always mount the unit vertically unless specifically calibrated otherwise by the factory.
Is this switch compatible with natural gas or combustible media?
This specific model is designed for air and non-combustible, compatible gases. For applications involving natural gas or other combustible media, the 1950G series is generally the required alternative to ensure safe venting and material compatibility.
How do I wire the SPDT switch for fan status monitoring?
The internal SPDT switch includes three screw terminals: Common (COM), Normally Open (NO), and Normally Closed (NC). For a typical "proof-of-flow" interlock, wire to the NO terminal; the circuit will close once the static pressure rises above your set point.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Dwyer Instruments 1950-20-2F Pressure Switch is a trade-standard solution for monitoring differential pressure in hazardous locations. Engineered as an explosion-proof alternative to the Series 1900, this unit integrates a weatherproof housing that meets NEMA 3, 7, and 9 ratings. With an adjustable range of 4 to 20" w.c. and a tight deadband of 0.40 to 0.60, it provides precise control for HVAC systems, fan proof-of-flow, and filter monitoring. The SPDT switch is rated for 15A at up to 480VAC, making it compatible with high-voltage industrial interlocks. Designed for air and non-combustible gases, the 1950-20-2F features a 1/8" female NPT process connection and an external set point screw for streamlined field calibration. Its compact, lightweight aluminum construction simplifies installation in tight mechanical spaces while maintaining UL, CSA, and FM approvals for Class I, II, and III environments.
Key Benefits for Technicians- Hazardous Location Protection: Certified for Class I, Div 1 (Groups C & D) and Class II (Groups E, F, G) environments, ensuring explosion-proof safety in industrial settings.
- Simplified Field Calibration: Features an external set point screw, allowing for precise adjustments without the need to disassemble the weatherproof housing.
- High Electrical Capacity: The heavy-duty SPDT snap switch handles up to 15A, providing reliable switching for motors, alarms, and low pressure control circuits.
- Compact Footprint: Approximately half the weight and bulk of conventional hazardous location pressure switches, ideal for crowded ductwork and panels.
- All-Weather Reliability: Dual-rated weatherproof and explosion-proof enclosure with an O-ring seal and drain plug for outdoor or wash-down applications.
What is the proper mounting orientation for the 1950-20-2F?
Standard calibration is performed with the diaphragm in a vertical position. For the best accuracy and to ensure the differential pressure switch maintains its specified set point, always mount the unit vertically unless specifically calibrated otherwise by the factory.
Is this switch compatible with natural gas or combustible media?
This specific model is designed for air and non-combustible, compatible gases. For applications involving natural gas or other combustible media, the 1950G series is generally the required alternative to ensure safe venting and material compatibility.
How do I wire the SPDT switch for fan status monitoring?
The internal SPDT switch includes three screw terminals: Common (COM), Normally Open (NO), and Normally Closed (NC). For a typical "proof-of-flow" interlock, wire to the NO terminal; the circuit will close once the static pressure rises above your set point.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
