Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM Specification

Sensor Type
Diaphragm Sensor

Thread
1/8 NPT Female

Outer Size
115 mm dia (approx)

Seal Material
Silicone Rubber

Display
Analog

Grade
Industrial Grade

Material
Die-cast Aluminum Housing

Dial Material
Aluminum with baked white finish

Pointer Material
Black Finished Aluminum

Processing Type
Injection Molded Casing

Diameter
115 mm

Glass Size
Full view

Mount Type
Surface / Panel Mount

Scale Range
0 to 6 mm WC

Accuracy
2% of full scale

Accessories
Mounting hardware, operating manual

Weight
Approx 750 grams

Ambient Temperature Range
-6.7 to 60C

Number of Relays
2 SPDT Snap Acting Relays

Switch Type
Photohelic (relay output)

Operating Voltage
120/240 VAC, 50/60 Hz

Model
Dwyer 3000MRS

Enclosure Rating
IP54 / NEMA 3

Compliance/Certifications
CE Marked

Contact Rating
5A @ 120/240 VAC

Pressure Connections
High and Low, 1/8" NPT

Application
Monitoring and control of air differential pressure in HVAC, clean rooms, filter banks, etc.

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM Trade Information

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

Main Export Market(s)
Asia

Main Domestic Market
All India

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM About

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

Series 3000MR/3000MRS Photohelic Switch/Gage

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

Model	Description
3000MRS-6 MM	Pressure Switch/Gage,Range 0 - 6 MM, .20 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 70F
Pressure Limits	-20" Hg to 25 psig
Temperature Limits	20 to 120F
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 Monitoring and Control

Designed for critical environments, the Dwyer 3000MRS Photohelic Switch/Gauge integrates precise differential pressure measurement with relay switching in a single compact device. Its dual relays and visual analog display streamline automatic pressure control and monitoring, making it ideal for applications like HVAC, clean rooms, and filter banks.

Rugged Construction for Industrial Demands

Encased in powder-coated, die-cast aluminum with an IP54/NEMA 3 rating, this Photohelic switch/gauge withstands harsh industrial environments and resist dust, oil, and splashes. Its durable design ensures reliable performance and longevity, supported by high-quality materials such as silicone rubber seals and injection-molded casing.

Easy Installation and Operation

The Dwyer 3000MRS features simple surface and panel mounting, making setup straightforward. It is equipped with high and low 1/8" NPT pressure connections, a clear full-view dial, and inclusive mounting hardware. The analog display allows quick, precise readings and the relay outputs support seamless integration with other control systems.

FAQ's of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge measure differential pressure?

A: The Dwyer 3000MRS utilizes a diaphragm sensor to detect the difference between high and low-pressure inputs (via 1/8" NPT connections), displaying the result on a full-view analog dial in the range of 0 to 6 mm WC with 2% full-scale accuracy.

Q: What types of applications is this device best suited for?

A: This Photohelic switch/gauge is ideal for monitoring and controlling air differential pressure in HVAC systems, clean rooms, filter banks, and similar industrial environments. It is also suitable for measuring low pressures of steam, gas, and oil.

Q: When should the relays be used, and what are their benefits?

A: The two SPDT snap acting relays can be used to automate control based on pressure thresholds, enabling alarms or system responses (like fan activation) when set limits are reached, thus enhancing safety and operation efficiency.

Q: What is the installation process for the 3000MRS Photohelic Switch/Gauge?

A: Installation involves mounting the unit on a surface or panel, connecting the high and low-pressure lines to the 1/8" NPT ports, and wiring to the 120/240 VAC supply and relay outputs. The device comes with all necessary mounting hardware and a comprehensive manual.

Q: Where is the Dwyer 3000MRS commonly installed?

A: The device is typically deployed in HVAC ductwork, control panels for clean rooms, or monitoring stations within filter banks, wherever continuous differential pressure measurement and switch control are required.

Q: What certifications and compliance does this gauge have?

A: The Dwyer 3000MRS is CE Marked, indicating compliance with European safety, health, and environmental protection standards, making it suitable for a wide range of industrial applications.

Q: How does the robust construction benefit users in industrial settings?

A: Its die-cast aluminum housing, silicone rubber seals, and powder-coated finish provide excellent durability and protection against mechanical stress and environmental contaminants, ensuring reliable performance over time.

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