Dwyer 3000MR/3000MRS Photohelic Switch / Gage

Dwyer 3000MR/3000MRS Photohelic Switch/Gages 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 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. All models provide both low and high limit control and include 18-inch (45 cm) cable assemblies for electrical connections.

Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig (1.725 bar). Optional construction is available for use to either 35 psig (2.42 bar) or 80 psig (5.51 bar). Included Accessories: mounting ring, snap ring; 18″ (45 cm) 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); and (3) 6-32 x 5/16″ RH machine screws (surface mounting).

Dwyer 3000MR/3000MRS Photohelic Features

  • Gage reading unaffected by switch operation and will continue to read pressure even during power loss
  • Zero and range adjustments outside of gage means no disassembly in normal service
  • Solid-state design allows for switching in high cycle rate applications without degradation

Application

  • Pneumatic Conveying
  • Air Conditioning Systems
  • Clean Rooms

Dwyer 3000MR/3000MRS Photohelic Specification

Service Air and non-combustible, compatible gases.
Wetted Materials Consult factory.
Accuracy ±2% of FS (3000-0 ±3% of FS). (3000-00 ±4% of FS).
Pressure Limit -20″ Hg. to 25 psig (-0.677 bar to 1.72 bar). MP option: 35 psig (2.41 bar), HP option: 80 psig (5.52 bar).
Temperature Limits 20 to 120°F (-6.67 to 48.9°C).
Process Connections 1/8″ female NPT (duplicated side and back).
Size 4″ (101.6 mm) dial face, 5″ (127 mm) OD x 3-1/8″ (79.38 mm).
Weight 1.8 Ib (816 g).
Switch Specifications 3000MR
Switch Type Each setpoint has 1 form C relays (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″ (46 cm) cable assembly with 8 conductors. Optional lengths to 100′ (30.5 m).
Power Requirements 24 VDC, regulated ±10%.
Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations.
Set Point Adjustment Adjustable knobs on face.
Agency Approvals CE.
Switch Specifications 3000MRS
Switch Type Each setpoint has a solid state relay.
Switching Voltage 20-280 VAC (47-63 Hz).
Switching Current 1.0 amp (AC) max., 0.01 mA (AC) min., (2) SPST NO.
Electrical Connections 18″ (46 cm) cable assembly with 6 conductors, optional lengths to 100′ (30.5 m).
Power Requirements 24 VDC, regulated ±10%. 24VAC optional.
Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations.
Set Point Adjustment Adjustable knobs on face.
Agency Approvals CE.

Download Data Sheet: Series 3000MR/3000MRS Photohelic® Switch/Gage

Ref: dwyer-inst.com

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