Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge

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Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge

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Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge Specification

Grade
Industrial

Seal Material
Silicone

Thread
1/8 NPT Female

Sensor Type
Differential Pressure

Display
Analog

Bourdon Tube
No

Outer Size
114 mm (4.5 inch) Dia.

Material
Die cast aluminum case, polycarbonate lens

Dial Material
White with black markings

Pointer Material
Black aluminum

Processing Type
Molded plastic case

Diameter
114 mm (4.5 inch)

Glass Size
113 mm approx.

Mount Type
Surface or flush mounting

Scale Range
0-0.25 w.c. (water column)

Accuracy
2% of full scale

Accessories
Mounting hardware, instruction manual

Maximum Pressure
25 psig (1.7 bar)

Weight
1.5 lbs (0.68 kg)

Switch Setpoint Adjustment
External knobs

Operating Temperature Range
20F to 120F (-6.67C to 48.9C)

Contact Material
Silver alloy

Switch Type
Dual electric switch (Photohelic)

Electrical Rating
SPDT rated 10A @ 120/240VAC

Enclosure Rating
NEMA 2 (IP51)

Power Requirements
None for gauge; Switch 120/240VAC

Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge Trade Information

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

Main Export Market(s)
Asia

Main Domestic Market
All India

About Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge

Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge

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

Description

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

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)

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.

Applications

Fan Control
Damper Control
Environmental Pollution Control

Specification

Gage Specifications
Service	Air and non-combustible, compatible gases
Accuracy	±4% 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

Versatile Dual Functionality for Process Control

The 3000MR-00 Photohelic excels by seamlessly integrating a differential pressure gauge and two independent SPDT electrical switches. This allows real-time monitoring of low-pressure systems while providing automatic control actions-such as activating alarms or shutdown protocols-when specified thresholds are crossed. Its adaptability across steam, oil, or gas systems ensures wide-ranging utility in industrial and HVAC settings.

Robust Design for Demanding Environments

Featuring a die-cast aluminum case and molded plastic construction, the 3000MR-00 is engineered for reliable performance. The enclosure meets NEMA 2 (IP51) criteria, offering resistance to dust and dripping water. The analog display with a polycarbonate lens and white dial ensures visibility and durability in industrial settings, and external adjustment knobs facilitate convenient calibration without disassembly.

Easy Installation and Flexible Mounting

With user-friendly surface or flush mounting options, the 3000MR-00 is supplied with comprehensive mounting hardware and a detailed instruction manual. Its 1/8" NPT female threads enable seamless integration into existing systems. The textured black finish and clear analog display complement its robust engineering, while the 4.5-inch diameter and lightweight design ensure effortless installation and ongoing maintenance.

FAQ's of Dwyer 3000MR-00 Photohelic Differential Pressure Switch/Gauge:

Q: How do I adjust the switch setpoints on the Dwyer 3000MR-00 Photohelic gauge?

A: The switch setpoints are easily adjusted using the external knobs located on the gauge housing. This allows for precise control of actuation points without opening the enclosure or disrupting your installation.

Q: What types of media can the 3000MR-00 measure pressure for?

A: This model is suitable for measuring the differential pressure of steam, oil, and gas, making it ideal for a variety of process control and HVAC applications.

Q: When is it necessary to use a dual switch differential pressure gauge like the 3000MR-00?

A: A dual switch model is beneficial when both pressure monitoring and automatic system responses (such as alarms or equipment shutdowns) are required at preset pressure points, enhancing safety and process automation.

Q: Where can the Photohelic 3000MR-00 be mounted, and what mounting options are available?

A: The 3000MR-00 can be installed either by surface or flush mounting, accommodating diverse panel or wall setups for easy integration into your existing system.

Q: What is the process for installing the Dwyer 3000MR-00, and what accessories are included?

A: Installation is straightforward using the included mounting hardware and instruction manual. The 1/8" NPT female threads ensure compatibility with standard piping, and accessories provided simplify installation and calibration.

Q: How does the built-in analog display benefit users in industrial environments?

A: The analog display provides immediate visual feedback with high accuracy (2% of full scale), enabling quick pressure assessment and enhancing operational safety for steam, gas, or oil systems.

Q: What are the main usage advantages of the 3000MR-00 Photohelic differential pressure gauge?

A: Its combined monitoring and switching capability reduces equipment needs, simplifies control, and supports reliable, energy-efficient system performance in industrial-grade applications.

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