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Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge

Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge

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 3000MR-00 Photohelic Differential Pressure Switch/Gauge

Pressure Switch/Gage, Range 0-0.25" w.c..005 minor divisions. 


Series 3000MR Photohelic® Switch/Gage, Additional Range 0-0.25" w.c., Relay Type - Electromechanical Relays


  • 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)

The 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. For applications requiring high cycle rates, choose 3000MRS models with SPST (N.O.) solid state relays. Model provide both low and high limit control and include 18-inch 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.


  • Fan Control
  • Damper Control
  • Environmental Pollution Control


Gage Specifications
ServiceAir and non-combustible, compatible gases
Accuracy±4% of FS at 70°F
Pressure Limits-20" Hg to 25 psig
Temperature Limits20 to 120°F
Process Connections1/8 female NPT (duplicated side and back)
Size4" 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 AdjustmentAdjustable knobs on face
Agency ApprovalsCE


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