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Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch

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Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch

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Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch Specification

Thread
1/8 NPT female connections

Display
Analog with dual setpoint indicators

Bourdon Tube
Not Applicable (Diaphragm Sensing Element)

Sensor Type
Photoelectric Differential Pressure Sensor

Grade
Industrial

Seal Material
Silicone rubber

Material
Die-cast aluminum case, Polycarbonate front cover

Dial Material
White anodized aluminum

Pointer Material
Black aluminum

Processing Type
Photohelic (Photoelectric + Helical pointer mechanism)

Diameter
4 inches (101.6 mm)

Glass Size
4 inches

Mount Type
Panel Mount

Scale Range
0 to 1 inch w.c. (Water Column)

Accuracy
2% of full scale

Finishing
Textured Gray Finish

Measure Pressure Of
Air and non-combustible, compatible gases

Accessories
Mounting bracket, Instruction manual

Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch Trade Information

Payment Terms
Cash on Delivery (COD), Cash Against Delivery (CAD), Cash in Advance (CID), Cheque, Cash Advance (CA)

Main Export Market(s)
Eastern Europe, Middle East, Western Europe, Africa, Central America, Australia, South America, Asia, North America

Main Domestic Market
All India

About Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch

Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3001MRS-1 inch	Pressure Switch/Gage,Range 0-1 inch, .02 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 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"
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

High-Precision Differential Pressure Monitoring

The Dwyer 3001MRS Photohelic Switch/Gauge is engineered for rigorous industrial applications, offering accurate pressure measurement from 0 to 1 inch w.c. Its advanced photoelectric sensor and helical pointer mechanism ensure clear, analog readings, while the fast response time makes it ideal for processes requiring timely control and feedback.

Robust Construction for Demanding Environments

Built from die-cast aluminum with a polycarbonate cover and finished in textured gray, the 3001MRS promises durability and resilience in harsh settings. The IP54-rated front face guards against dust and moisture, while its silicone rubber seals maintain integrity even under frequent use.

Flexible Switching and Installation Convenience

Equipped with two adjustable SPDT relay outputs, this gauge accommodates a broad range of control scenarios. The 4-inch panel mount design and included accessoriesmounting bracket and manualstreamline setup, making it versatile for manufacturers, traders, and suppliers alike.

FAQs of Dwyer 3001MRS Photohelic Switch/Gauge 0 to 1 inch:

Q: How does the Dwyer 3001MRS Photohelic Switch/Gauge operate without external power?

A: The 3001MRS gauge portion is purely mechanical and photoelectric, requiring no outside power source to function. The integrated SPDT relay contacts are rated to handle supplied circuit voltages, allowing switch operation without additional power for the gauge itself.

Q: What gases can this Photohelic switch/gauge safely measure?

A: This device is designed to measure air and other non-combustible, compatible gases. It is not suitable for flammable or aggressive chemical gases, as the sensor and materials are engineered for typical industrial ventilation or process air streams.

Q: When is it beneficial to use the dual adjustable SPDT switches?

A: The dual SPDT switches are valuable when controlling up to two independent setpoints, such as activating alarms, controlling fans, or initiating process responses at different pressure levels. This enhances process safety, automation, and system efficiency.

Q: Where is the Dwyer 3001MRS typically installed?

A: It is panel-mounted using a 4-13/16" (122 mm) circular cutout, making it suitable for control cabinets, industrial machinery panels, HVAC air handling systems, and process equipment in manufacturing or laboratory environments.

Q: What is the process for setting the switch points on this gauge?

A: Setpoints are adjusted manually via the front panel using external controls to move the indicator markers on the display, enabling precise tuning of activation thresholds for both relay outputs.

Q: How fast does the Dwyer 3001MRS respond to changing pressure conditions?

A: With a response time of less than one second, the gauge provides swift switching action, ensuring timely system responses and helping maintain stable and efficient control in rapid-changing environments.

Q: What are the primary benefits of using this Photohelic differential pressure gauge?

A: Users gain accurate analog pressure indication, immediate relay-based switching, robust industrial construction, and a maintenance-free, power-independent gauge. This makes it a reliable and versatile monitoring and control solution for air and compatible gas pressure applications.

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