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

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

Seal Material
Neoprene

Outer Size
114 mm diameter (4-1/2)

Thread
Standard panel mount

Sensor Type
Photohelic Switch/Gauge

Display
Analog

Grade
Industrial

Material
Die cast aluminum housing

Dial Material
Acrylic

Pointer Material
Metal

Processing Type
Electrical switching with analog indication

Diameter
114 mm (4-1/2)

Glass Size
Full front dial

Mount Type
Panel Mount

Scale Range
0 to 20 in W.C. (inches Water Column)

Accuracy
2% of full scale

Finishing
Black epoxy-coated housing

Measure Pressure Of
Air and compatible gases

Accessories
Mounting bracket, installation hardware, manual

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

Payment Terms
Cash on Delivery (COD), Cash Advance (CA), Cash Against Delivery (CAD), Cash in Advance (CID), Cheque

Main Export Market(s)
Australia, North America, South America, Eastern Europe, Middle East, Western Europe, Asia, Central America, Africa

Main Domestic Market
All India

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.

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

Q: How is the Dwyer 3020MRS Photohelic Switch/Gauge typically used in air handling systems?

A: This device monitors and controls air pressure across filters, blowers, and ducts. By sensing differential pressure, it triggers SPDT snap switches to activate alarms, controls, or safety shutoffs, ensuring optimal system performance and maintenance scheduling.

Q: What installation requirements should I consider for the 3020MRS Photohelic Switch/Gauge?

A: The Photohelic is designed for panel mounting with a standard 114 mm diameter cutout. It includes necessary mounting hardware, connects via screw terminals for electrical input (120 VAC), and uses 1/8" NPT female ports for pressure connections. Ensure installation within its operating temperature range (-18 to 60C).

Q: When should I use this gauge instead of a standard pressure gauge or switch?

A: Choose the 3020MRS Photohelic when your application demands both an analog pressure display and electrical switching. This integration supports real-time monitoring and automated control, reducing the need for separate instruments and simplifying system design.

Q: Where can the Dwyer 3020MRS Photohelic be implemented effectively?

A: It is suited for industrial settings such as HVAC systems, filter monitoring, blower controls, and any application measuring air or compatible gases. Its NEMA 2 rating provides protection for indoor applications subject to dust and moderate moisture.

Q: What are the benefits of the Photohelics instantaneous mechanical response?

A: The instantaneous response ensures immediate switching and pressure display with minimal lag, which is crucial for safety interlocks and real-time system adjustments, enhancing operational safety and efficiency.

Q: How accurate and repeatable are the pressure measurements with this device?

A: The 3020MRS offers an accuracy of 2% of full scale and repeatability of 1%. This high level of precision makes it reliable for sensitive air system monitoring and control tasks.

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