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Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

Product Details:


Product Specifications

  • Gas, Oil, Steam

Trade Information

  • Cash in Advance (CID), Cash Advance (CA), Cash on Delivery (COD), Cash Against Delivery (CAD)
  • Asia
  • West Bengal, Uttarakhand, Uttar Pradesh, Tripura, Telangana, Tamil Nadu, Sikkim, Rajasthan, Pondicherry, Punjab, Odisha, Nagaland, Manipur, Meghalaya, Mizoram, Maharashtra, Madhya Pradesh, Lakshadweep, Kerala, Karnataka, Jharkhand, Jammu and Kashmir, Himachal Pradesh, Haryana, Goa, Gujarat, Daman and Diu, Dadra and Nagar Haveli, Delhi, Chandigarh, Chhattisgarh, Bihar, Arunachal Pradesh, Assam, Andhra Pradesh, Andaman and Nicobar Islands, West India, East India, North India, Central India, South India, All India

Product Description

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


 3030MRS-30 inchPressure Switch/Gage,Range 0-30 inch, 1.0 minor divisions



  • 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.


  • Fan Control
  • Damper Control
  • Environmental Pollution Control


  • CE Approval
  • GOST-R Certificate


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" 
 Weight1.8 lb 
 Switch Specifications 
 Switch TypeEach 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 Connections18" cable assembly with 8 conductors 
 Power Requirements24 VDC, regulated ±10% 
 Mounting OrientationDiaphragm in vertical position 
Set Point Adjustment Adjustable knobs on face 
 Agency ApprovalsCE 


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