About Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

 

Series 3000MR/3000MRS Photohelic Switch/Gage

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

 

Model	Description
3030MRS-30 inch	Pressure Switch/Gage,Range 0-30 inch, 1.0 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 70F
Pressure Limits	-20" Hg to 25 psig
Temperature Limits	20 to 120F
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

Versatile Pressure Monitoring and Control

The Dwyer 3030MRS Photohelic Switch/Gauge delivers reliable differential pressure monitoring and electronic switching in one instrument. Its adjustable front controls enable users to set switching points with ease, facilitating instant response in HVAC, cleanroom, and filtration scenarios. The analog dial, clear full-front view, and high-accuracy readings ensure precise monitoring, while panel or surface mounting options offer installation flexibility.


Durable Construction for Tough Conditions

Engineered from die-cast aluminum and protected under an IP54-rated enclosure, the 3030MRS stands up to challenging industrial environments. Its powder-coated finish, neoprene seals, and high-impact acrylic dial enhance longevity, ensuring extended operation in demanding settings. The gauge is supplied with all necessary mounting hardware and an instruction manual for seamless setup.


Advanced Features for Industrial Needs

This model features instant electronic switching, a 2% full scale accuracy, and compatibility with air and many gases. It operates within a wide temperature range (-6C to 49C), is powered externally, and includes CE marking and RoHS compliance for safety and environmental assurance. With 1/8 NPT female thread connections and a 4-1/2 inch diameter, it integrates painlessly into various process lines.