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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 500 Pa

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 500 Pa

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Product Description

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 500 Pa

Series 3000MR/3000MRS Photohelic® Switch/Gage

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


 3000MRS-500 PaPressure Switch/Gage,Range 0-500 Pa, 10.0 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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