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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM Specification

Sensor Type
Photohelic Differential Pressure Switch/Gauge

Bourdon Tube
Not Applicable (Utilizes Diaphragm Sensing Element)

Display
Analog with Clear Marked Scale

Seal Material
Silicone/Neoprene Seals

Outer Size
Standard Compact Round Case

Grade
Industrial Grade

Thread
1/8 NPT Female

Material
Die-Cast Aluminium Case, Polycarbonate Window

Dial Material
Aluminium with Marked Scale

Pointer Material
Black Anodized Aluminium

Processing Type
Precision Manufacturing

Diameter
Approx. 100 mm (4 in.) case diameter

Glass Size
Full View Polycarbonate Window

Mount Type
Panel Mount or Surface Mount

Scale Range
0 to 10 MM (Millimeters of Water)

Accuracy
2% Full Scale

Finishing
Matte Black Finished Body with Clear Polycarbonate Front

Measure Pressure Of
Low Air and Non-Corrosive Gas Differential Pressure

Accessories
Mounting hardware, Installation Instructions

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-10 MM	Pressure Switch/Gage,Range 0 - 10 MM, .50 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

Dual SPDT Snap Action Switches

This model features dual SPDT electric switches that offer reliable snap action performance. These switches can be wired for control functions such as alarms or system shutdown, enabling automated response to pressure deviations. They can handle loads up to 15A at 120/240 VAC, supporting most industrial control requirements without additional relays.

Versatile Installation and Easy Adjustment

Designed for straightforward installation, the 3000MRS can be panel or surface mounted, fitting into standard round cutouts (100 mm diameter). Front-accessible zero adjustment and rear screw terminals simplify set-up and maintenance, making it an excellent choice for routine filter and fan system monitoring.

Precise and Clear Analog Monitoring

The analog display offers clear, marked readings from 0 to 10 mm, allowing operators to monitor low air and non-corrosive gas differential pressures with 2% full scale accuracy. The diaphragm sensing element provides repeatable and stable measurements, contributing to overall process reliability.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 10 MM:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge operate in filter monitoring applications?

A: The Dwyer 3000MRS monitors the differential pressure across filters. When the set pressure point is reached, its dual SPDT snap action switches can trigger an alarm or control signal, indicating filter replacement or cleaning is needed, ensuring optimal system performance.

Q: What installation options are available for the 3000MRS Photohelic?

A: This unit supports both panel mount and surface mount installation, fitting standard compact round cutouts. The included mounting hardware and accessible screw terminals at the rear facilitate convenient and secure setup in various industrial environments.

Q: Where can the Dwyer 3000MRS be utilized effectively?

A: It is ideally suited for use in industrial settings such as HVAC systems, clean rooms, and air handling units. Applications include filter monitoring, fan control, duct pressure measurement, and maintaining controlled room conditions for sensitive processes.

Q: What is the process for zero adjustment on this device?

A: Zero adjustment can be accomplished using the front-accessible screw adjustment. This allows users to calibrate the gauge to ensure accurate measurements, compensating for any offsets due to environmental or installation factors.

Q: When should the Dwyer 3000MRS be selected over other pressure gauges?

A: Choose the 3000MRS when precise, repeatable differential pressure measurement and reliable switch control are required, especially in low air or non-corrosive gas applications where integrated monitoring and switching functions offer operational benefits.

Q: What are the main benefits of its dual SPDT electric switches?

A: The dual SPDT switches provide independent control for two separate alarm or process control circuits, allowing for versatile automation and safety measures based on precise pressure thresholds.

Q: How does the enclosure rating and construction enhance the durability of the 3000MRS model?

A: With an IP54 (NEMA Type 3) rating and die-cast aluminium case, the gauge is protected against dust and splashing water, making it suitable for tough industrial environments and extending equipment lifespan.

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