Dwyer Instruments DA-31-2-1 Pressure Switch
The Dwyer Instruments DA-31-2-1 Pressure Switch is a high-sensitivity control solution designed for demanding mechanical HVAC and process equipment applications. Featuring a durable brass bourdon tube, this DA series pressure switch provides exceptional repeatability of ±1% across its full range. This specific model is a mercury switch configuration, offering a single-pole single-throw (SPST) contact that is open on increase (open on rise). With an adjustable operating range of 1/8 to 15 psig, it allows technicians to fine-tune high and low setpoints using external thumbscrews and a visible calibrated dial, reducing setup time and eliminating the need to open the general purpose enclosure.
Built for reliability in pump control and compressor systems, the DA-31-2-1 maintains a 1 psig minimum deadband. The 1/4 inch male NPT process connection and 1/2 inch conduit hub ensure streamlined installation into standard piping systems. Designed for vertical mounting, this low pressure control handles media temperatures up to 180°F (82°C). Its rugged construction and external status indicator provide clear on/off feedback, ensuring your equipment operates within precise pressure parameters without unnecessary recycling.
Key Benefits- External Dual Adjustments: Independent set and reset point pointers allow for precise calibration of the operating differential across the full scale.
- High Repeatability: The bourdon tube sensing element ensures consistent performance within ±1% of the 15 psig range.
- Visible Calibrated Dial: Transparent cover enables quick inspection of setpoints and switch status without exposing internal components.
- Rugged Brass Sensing Element: Compatible with a wide variety of non-corrosive gases and liquids in HVACR and industrial environments.
Is the deadband on the DA-31-2-1 adjustable?
Yes, as a DA series model, this switch features two external adjustments that allow you to set both the high pressure operating point and the reset point, effectively making the deadband adjustable over the full 15 psig scale.
What is the difference between "Open on Increase" and "Close on Increase"?
An "Open on Increase" switch like the DA-31-2-1 will break the electrical circuit (turn off a load) when the pressure rises to your high setpoint. "Close on Increase" switches complete the circuit when pressure rises, typically used to trigger an alarm or start a secondary process.
Can I use this switch for steam applications?
While the brass bourdon tube is durable, always use a pigtail siphon for steam service to protect the internal element from high temperatures that exceed the 180°F maximum limit.
This item is not eligible for free shipping.
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: $1,505.47
-65%$1,505.47
$526.91Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Dwyer Instruments DA-31-2-1 Pressure Switch is a high-sensitivity control solution designed for demanding mechanical HVAC and process equipment applications. Featuring a durable brass bourdon tube, this DA series pressure switch provides exceptional repeatability of ±1% across its full range. This specific model is a mercury switch configuration, offering a single-pole single-throw (SPST) contact that is open on increase (open on rise). With an adjustable operating range of 1/8 to 15 psig, it allows technicians to fine-tune high and low setpoints using external thumbscrews and a visible calibrated dial, reducing setup time and eliminating the need to open the general purpose enclosure.
Built for reliability in pump control and compressor systems, the DA-31-2-1 maintains a 1 psig minimum deadband. The 1/4 inch male NPT process connection and 1/2 inch conduit hub ensure streamlined installation into standard piping systems. Designed for vertical mounting, this low pressure control handles media temperatures up to 180°F (82°C). Its rugged construction and external status indicator provide clear on/off feedback, ensuring your equipment operates within precise pressure parameters without unnecessary recycling.
Key Benefits- External Dual Adjustments: Independent set and reset point pointers allow for precise calibration of the operating differential across the full scale.
- High Repeatability: The bourdon tube sensing element ensures consistent performance within ±1% of the 15 psig range.
- Visible Calibrated Dial: Transparent cover enables quick inspection of setpoints and switch status without exposing internal components.
- Rugged Brass Sensing Element: Compatible with a wide variety of non-corrosive gases and liquids in HVACR and industrial environments.
Is the deadband on the DA-31-2-1 adjustable?
Yes, as a DA series model, this switch features two external adjustments that allow you to set both the high pressure operating point and the reset point, effectively making the deadband adjustable over the full 15 psig scale.
What is the difference between "Open on Increase" and "Close on Increase"?
An "Open on Increase" switch like the DA-31-2-1 will break the electrical circuit (turn off a load) when the pressure rises to your high setpoint. "Close on Increase" switches complete the circuit when pressure rises, typically used to trigger an alarm or start a secondary process.
Can I use this switch for steam applications?
While the brass bourdon tube is durable, always use a pigtail siphon for steam service to protect the internal element from high temperatures that exceed the 180°F maximum limit.
This item is not eligible for free shipping.
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.
