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Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch

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Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch

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Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch Specification

Thread
1/8 NPT (Female)

Display
Analog with Setpoint Indicators

Sensor Type
Differential Pressure

Grade
Industrial

Bourdon Tube
Not Applicable (Diaphragm based)

Outer Size
Approximately 4-1/2 (114 mm) OD

Seal Material
Neoprene

Material
Die-cast Aluminum Case

Dial Material
Aluminum, white background

Pointer Material
Black Anodized Aluminum

Processing Type
Precision Molded Case

Diameter
4-1/2 inches (114 mm)

Glass Size
4 inches

Mount Type
Surface or Panel Mount

Scale Range
0 to 2 inch w.c.

Accuracy
2% of Full Scale

Finishing
Matte Black Enclosure

Measure Pressure Of
Air and Compatible Gases

Accessories
Panel Mounting Hardware, Mounting Bracket, Terminal Screws

Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch

Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch

Series 3000MR/3000MRS Photohelic® Switch/Gage

Combines Differential Pressure Gage with Low/High Set-Points,Compact Size

Model	Description
3002MRS-2 inch	Pressure Switch/Gage,Range 0-2 inch, .05 minor divisions.

Includes

mounting ring, snap ring
18" cable assembly
(2) 3/16" tubing to 1/8" NPT adapters
(2) 1/8" NPT pipe plugs
(4) 6-32 x 1-1/4" RH machine screws (panel mounting)
(3) 6-32 x 5/16" RH machine screws (surface mounting)

he Series 3000MR Photohelic® Switch/Gage 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" hole or surface mounted with hardware supplied. 3000MR models employ versatile electromechanical relays with gold over silver contacts - ideal for dry circuits.

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.

Applications

Fan Control
Damper Control
Environmental Pollution Control

Approvals

CE Approval
GOST-R Certificate

Specification

Service	Air and non-combustible, compatible gases
Accuracy	±2% of FS at 70°F
Pressure Limits	-20" Hg to 25 psig
Temperature Limits	20 to 120°F
Process Connections	1/8 female NPT (duplicated side and back)
Size	4" dial face, 5" O.D. x 3-1/8"
Weight	1.8 lb
Switch Specifications
Switch Type	Each setpoint has 1 Form C relay (SPDT)
Relay Contacts	(resistive load) 1 Form C rated 1.0A @ 30 VDC, 0.3A @ 110 VDC or 0.5A @ 125 VAC. Gold over clad silver - suitable for dry circuits
Electrical Connections	18" cable assembly with 8 conductors
Power Requirements	24 VDC, regulated ±10%
Mounting Orientation	Diaphragm in vertical position
Set Point Adjustment	Adjustable knobs on face
Agency Approvals	CE

Precise Differential Pressure Monitoring

Engineered for accuracy, the Dwyer 3002MRS Photohelic Switch/Gauge provides reliable monitoring and control of air and compatible gas pressures. The analog display, paired with clear setpoint indicators and external knob-adjustment, allows for real-time calibration and ease of operation.

Robust Design for Industrial Applications

Constructed with a die-cast aluminum case and IP54/NEMA 3 rated enclosure, this gauge is built for durability in challenging conditions. Its surface or panel mounting options and included accessories make installation straightforward, supporting a variety of industrial and process environments.

Versatile Control with Dual SPDT Relays

Equipped with dual SPDT electro-mechanical relays, the device supports on/off control for automated processes, enhancing operational safety and energy efficiency. This flexibility makes it suitable for integration into HVAC, filtration, and pressure control systems.

FAQs of Dwyer 3002MRS Photohelic Switch/Gauge 0 to 2 inch:

Q: How do I set or adjust the pressure setpoints on the Dwyer 3002MRS Photohelic Switch/Gauge?

A: The pressure setpoints can be easily adjusted from the outside of the device using the external, knob-adjustable controls. This allows you to fine-tune the switch points for both high and low pressure settings without opening the enclosure.

Q: What types of media can I measure with this gauge?

A: This gauge is designed for measuring differential pressure of air and compatible gases only. It should not be used for liquids or corrosive gases.

Q: Where should I mount the Dwyer 3002MRS for optimal performance?

A: The gauge is suitable for both surface and panel mounting. For best results, install it in an area within the specified temperature range (20 to 120F / -6 to 49C) and protect it from direct exposure to extreme weather or corrosive environments.

Q: What are the main benefits of using the dual SPDT relays in this device?

A: The dual SPDT relays offer flexible on/off control for automated processes, which is ideal for safety shutdowns, equipment start/stop, and alarm triggers in HVAC and industrial systems.

Q: When should the connections be made to the high and low pressure ports?

A: Connect the high-pressure and low-pressure ports (1/8" NPT female) to the appropriate points in your system during installation, ensuring the system is powered off to prevent accidental electrical contact or system errors.

Q: What is the process for installing the Dwyer 3002MRS gauge?

A: Installation involves attaching the provided mounting bracket or panel hardware, connecting wiring to the terminal screws, and then linking the pressure ports to your process system. Detailed installation guidance is provided in the supplied manual.

Q: Is the Dwyer 3002MRS compliant with industrial safety standards?

A: Yes, it is CE marked and meets IP54/NEMA 3 enclosure protection standards, ensuring it meets industry requirements for electrical safety and dust/water ingress resistance.

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