Dwyer Instruments 1900-5MR Pressure Switch
The Dwyer Instruments 1900-5MR Pressure Switch is a trade-reliable solution for technicians requiring precise monitoring in HVAC, refrigeration, and air handling systems. This compact low differential pressure switch is specifically engineered to handle air and non-combustible gases with a setpoint range of 1.4" w.c. to 5.5" w.c.. The "MR" designation signifies a manual reset pressure switch, an essential safety feature for critical alarm circuits and blower shutdown applications where automatic cycling must be prevented.
This unit features a single-pole double-throw (SPDT) contact rated at 15A, providing the flexibility needed for both power and signal-level switching. Built with a silicone diaphragm and a zinc-plated steel housing, it maintains ±3% repeatability even in demanding boiler or oven environments. The internal setpoint adjustment screw is located within the conduit enclosure to deter unauthorized tampering while allowing for easy calibration in the field. For standard installs, it utilizes 1/8" NPT female pressure ports and is intended for vertical diaphragm mounting to ensure maximum accuracy.
Key Benefits for the Contractor- Manual Reset Safety: Integrated latched snap switch requires physical intervention after a pressure trip, ensuring technicians can diagnose faults before system restart.
- High Current Capacity: The 15A electrical rating at 120-480 VAC allows for direct control of small motors or heavy-duty alarm circuits without additional relays.
- Broad Environmental Tolerance: Designed to operate in temperatures ranging from -30 to 180°F, making it suitable for unconditioned mechanical rooms and industrial dryer applications.
- Compact Footprint: Fits into tight corners and small enclosures where larger, more expensive differential pressure controllers cannot be mounted.
Is the Dwyer 1900-5MR suitable for sensing liquid pressure?
No, this series is strictly for air and non-combustible gases. Using this switch with liquids will damage the internal silicone diaphragm.
Can I adjust the setpoint without removing the cover?
The adjustment screw is located inside the conduit enclosure. This design is intentional to prevent field tampering and ensure that only qualified contractors make setpoint modifications.
Does this switch require a specific mounting position?
Yes, for the ±3% repeatability and published setpoint range to be valid, the switch must be mounted with the diaphragm in a vertical position.
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: $137.62
-65%$137.62
$48.17Dwyer Instruments 1900-5MR Pressure Switch
The Dwyer Instruments 1900-5MR Pressure Switch is a trade-reliable solution for technicians requiring precise monitoring in HVAC, refrigeration, and air handling systems. This compact low differential pressure switch is specifically engineered to handle air and non-combustible gases with a setpoint range of 1.4" w.c. to 5.5" w.c.. The "MR" designation signifies a manual reset pressure switch, an essential safety feature for critical alarm circuits and blower shutdown applications where automatic cycling must be prevented.
This unit features a single-pole double-throw (SPDT) contact rated at 15A, providing the flexibility needed for both power and signal-level switching. Built with a silicone diaphragm and a zinc-plated steel housing, it maintains ±3% repeatability even in demanding boiler or oven environments. The internal setpoint adjustment screw is located within the conduit enclosure to deter unauthorized tampering while allowing for easy calibration in the field. For standard installs, it utilizes 1/8" NPT female pressure ports and is intended for vertical diaphragm mounting to ensure maximum accuracy.
Key Benefits for the Contractor- Manual Reset Safety: Integrated latched snap switch requires physical intervention after a pressure trip, ensuring technicians can diagnose faults before system restart.
- High Current Capacity: The 15A electrical rating at 120-480 VAC allows for direct control of small motors or heavy-duty alarm circuits without additional relays.
- Broad Environmental Tolerance: Designed to operate in temperatures ranging from -30 to 180°F, making it suitable for unconditioned mechanical rooms and industrial dryer applications.
- Compact Footprint: Fits into tight corners and small enclosures where larger, more expensive differential pressure controllers cannot be mounted.
Is the Dwyer 1900-5MR suitable for sensing liquid pressure?
No, this series is strictly for air and non-combustible gases. Using this switch with liquids will damage the internal silicone diaphragm.
Can I adjust the setpoint without removing the cover?
The adjustment screw is located inside the conduit enclosure. This design is intentional to prevent field tampering and ensure that only qualified contractors make setpoint modifications.
Does this switch require a specific mounting position?
Yes, for the ±3% repeatability and published setpoint range to be valid, the switch must be mounted with the diaphragm in a vertical position.
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 1900-5MR Pressure Switch is a trade-reliable solution for technicians requiring precise monitoring in HVAC, refrigeration, and air handling systems. This compact low differential pressure switch is specifically engineered to handle air and non-combustible gases with a setpoint range of 1.4" w.c. to 5.5" w.c.. The "MR" designation signifies a manual reset pressure switch, an essential safety feature for critical alarm circuits and blower shutdown applications where automatic cycling must be prevented.
This unit features a single-pole double-throw (SPDT) contact rated at 15A, providing the flexibility needed for both power and signal-level switching. Built with a silicone diaphragm and a zinc-plated steel housing, it maintains ±3% repeatability even in demanding boiler or oven environments. The internal setpoint adjustment screw is located within the conduit enclosure to deter unauthorized tampering while allowing for easy calibration in the field. For standard installs, it utilizes 1/8" NPT female pressure ports and is intended for vertical diaphragm mounting to ensure maximum accuracy.
Key Benefits for the Contractor- Manual Reset Safety: Integrated latched snap switch requires physical intervention after a pressure trip, ensuring technicians can diagnose faults before system restart.
- High Current Capacity: The 15A electrical rating at 120-480 VAC allows for direct control of small motors or heavy-duty alarm circuits without additional relays.
- Broad Environmental Tolerance: Designed to operate in temperatures ranging from -30 to 180°F, making it suitable for unconditioned mechanical rooms and industrial dryer applications.
- Compact Footprint: Fits into tight corners and small enclosures where larger, more expensive differential pressure controllers cannot be mounted.
Is the Dwyer 1900-5MR suitable for sensing liquid pressure?
No, this series is strictly for air and non-combustible gases. Using this switch with liquids will damage the internal silicone diaphragm.
Can I adjust the setpoint without removing the cover?
The adjustment screw is located inside the conduit enclosure. This design is intentional to prevent field tampering and ensure that only qualified contractors make setpoint modifications.
Does this switch require a specific mounting position?
Yes, for the ±3% repeatability and published setpoint range to be valid, the switch must be mounted with the diaphragm in a vertical position.
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.
