Dwyer 3020MRS Photohelic,Switch/Gauge 0 to 20 in W.C

About Dwyer 3020MRS Photohelic,Switch/Gauge 0 to 20 in W.C

Dwyer 3020MRS Photohelic,Switch/Gauge 0 to 20 in W.C

Pressure switch/gage, range 0-20" w.c., .50 minor divisions.

Model: 3020MRS

Combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gauge employing the durable, time-proven Magnehelic gauge design. Versatile electromechanical relays with gold over silver contacts - ideal for dry circuits. 

Dwyer 3020MRS Photohelic, Switch/Gauge 0 to 20 in W.C.

Using solid state technology, there Series 3000MR and 3000MRS Photohelic switch/gauges combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage employing the durable, time-proven Magnehelic gage design. Switch setting is easy to adjust with large external knobs on the gage face. Gage reading is unaffected by switch operation - will indicate accurately even if power is interrupted. Solid state design now results in greatly reduced size and weight. Units can be flush mounted in 4-13/16" (122 mm) hole or surface mounted with hardware supplied. 3000MR models employ versatile electromechanical relays with gold over silver contacts - ideal for dry circuits. For applications requiring high cycle rates, choose 3000MRS models with SPST (N.O.) solid state relays. All models provide both low and high limit control and include 18-inch (45 cm) cable assemblies for electrical connections.

Gage accuracy is ±2% of full scale and switch repeatability is ±1%. Switch deadband is one pointer width - less than 1% of full scale. Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig (1.725 bar). 

Versatile Monitoring and Control

The 3020MRS Photohelic Switch/Gauge integrates precision pressure monitoring with reliable switching, making it an ideal solution for managing airflow, filter status, and blower operation in HVAC and industrial air systems. Its robust, die-cast aluminum NEMA 2-rated enclosure protects the device even in challenging environments.


User-Friendly Installation and Operation

Thanks to its standard panel mount design, full front analog dial, and included mounting bracket, the Photohelic is easy to install and operate. Equipped with screw terminal electrical connections and 1/8" NPT female ports, it supports straightforward wiring and tubing. The dials clear acrylic window provides instant, accurate readings.


Industrial-Grade Reliability and Compliance

The Dwyer 3020MRS meets rigorous industry standardsUL and CSA recognized, RoHS compliantand delivers instantaneous response and precise repeatability. Its epoxy-coated black housing ensures durability, while the devices high switch rating supports up to 10A at 120/240 VAC.