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Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch

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Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch

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Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch Specification

Seal Material
Neoprene

Grade
Industrial Grade

Outer Size
5-1/2 inches (Depth)

Sensor Type
Photohelic Switch/Gauge

Thread
1/8 Female NPT

Display
Analog

Material
Die Cast Aluminum Case

Dial Material
Polycarbonate

Pointer Material
Anodized Aluminum

Processing Type
Electromechanical

Diameter
4 inches (Dial Size)

Glass Size
4 inches

Mount Type
Flush or Surface Mount

Scale Range
0 to 100 inch (inches of water column)

Accuracy
2% of Full Scale

Finishing
Matte Black Case Finish

Measure Pressure Of
Air and Compatible Gases

Accessories
Mounting Bracket, Instruction Manual

Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch

Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3100MRS-100 inch	Pressure Switch/Gage,Range 0-100 inch, 2.0 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

Precision Measurement and Reliable Switching

Designed for critical air and gas pressure applications, the Dwyer 3100MRS Photohelic Switch/Gauge offers both accurate analog indication and dependable dual switching. Its repeatability of 1% of full scale guarantees reliable performance in process control, safety shutoff, and monitoring systems. External zero adjustment and a clear acrylic window make calibration and readings both effortless and visually accessible.

Industrial Durability and User-Friendly Installation

Encased in a die-cast aluminum housing with a matte black finish, this gauge is tailored for industrial use. The NEMA 2 (IP54) rating protects internal components from dust and splashing water. With flexible flush or surface mounting options and included accessories such as a mounting bracket and instruction manual, installation is straightforward for professionals and technicians alike.

FAQs of Dwyer 3100MRS Photohelic Switch/Gauge 0 to 100 inch:

Q: How do I install the Dwyer 3100MRS Photohelic Switch/Gauge?

A: Mount the gauge vertically using either a flush or surface mount as indicated in the included instruction manual and use the provided mounting bracket. Connect process lines to the two 1/8" NPT female ports and ensure the power supply is 120 VAC/60Hz.

Q: What types of media can the Dwyer 3100MRS measure?

A: This device is specifically designed for measuring the pressure of air and compatible non-corrosive gases within process systems.

Q: Where can the Dwyer 3100MRS Photohelic Switch/Gauge be used?

A: It is well-suited for industrial environments such as HVAC systems, clean rooms, filter monitoring setups, and general process control applications, particularly where durable and reliable air pressure measurement is required.

Q: What is the benefit of having dual SPDT switches in this gauge?

A: The dual SPDT switches allow for precise control of multiple processes, enabling automatic start/stop or alarm activation when the pressure reaches preset levels, thereby enhancing safety and system efficiency.

Q: How is zero adjustment performed on the Dwyer 3100MRS?

A: Zero adjustment can be easily done externally using the adjustment knob located on the front panel, ensuring quick calibration without disassembling the unit.

Q: What is the maximum pressure the device can withstand?

A: The maximum pressure capacity for the Dwyer 3100MRS is 25 psi (1.72 bar), making it suitable for typical low-pressure air and gas monitoring tasks.

Q: When should the device be recalibrated or serviced?

A: For optimal accuracy, it is recommended to recalibrate or inspect the device annually, or as required by your applications maintenance standards, especially if used in critical process control environments.

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