Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa Specification

Outer Size
110 mm (approximate front flange diameter)

Seal Material
Integral Buna-N diaphragm

Display
Analog

Sensor Type
Photohelic Differential Pressure Switch/Gauge

Thread
1/8 female NPT high and low pressure connections

Grade
Industrial

Material
Die Cast Aluminum Case, Acrylic Lens

Dial Material
Acrylic

Pointer Material
Aluminum

Processing Type
Injection Molded Case and Dial

Diameter
101 mm (4 inch dial size)

Glass Size
101 mm (Acrylic Window)

Mount Type
Surface or Panel Mount

Scale Range
0 to 3 kPa

Accuracy
2% of full scale

Accessories
Mounting Hardware, Installation Manual

Power Supply
Not Required for Gauge; Switch 120/240V AC

Pressure Limits
-20 to 100 kPa

Temperature Range
-6.67 to 60C (20 to 140F)

Switch Type
SPDT Snap Switch (2 relays)

Enclosure Protection
IP54 (front only)

Electrical Connection
Screw Terminals

Response Time
Instantaneous (mechanical reading)

Contact Rating
10A @ 120/240 VAC

Number of Switches
Two

Repeatability
1% of full scale

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa Trade Information

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

Main Export Market(s)
Asia

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-3 kPa	Pressure Switch/Gage,Range 0-3 kPa, .10 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

Reliable Analog Display for Precise Monitoring

The Dwyer 3000MRS features a 4-inch analog dial with an acrylic window, providing accurate, instantaneous mechanical readings at a glance. Its scale range of 0 to 3 kPa delivers clear measurement in low-pressure applications, with repeatability of 1% and accuracy within 2% of full scale-perfect for sensitive monitoring needs in industrial environments.

Dual Control and Monitoring Functions

Equipped with two SPDT snap switches (rated 10A @ 120/240 VAC), the 3000MRS operates as both a differential pressure indicator and a control switch. This dual-functionality enables automated system responses based on pressure thresholds, offering users seamless integration for process safety and efficiency improvements.

Durable Industrial Design

Engineered for tough industrial applications, the device incorporates a die cast aluminum case, powder coating, integral Buna-N diaphragm, and acrylic lens. Its IP54-protected front and operating temperature range from -6.67 to 60C ensure resilience under harsh field conditions. Surface or panel mounting options and included hardware make for hassle-free installation.

FAQ's of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 3 kPa:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge operate without a separate power supply for the gauge?

A: The gauge component of the Dwyer 3000MRS utilizes mechanical movement for pressure indication, meaning it requires no external power for operation. Power is only needed for the switch function to operate the SPDT relays (120/240V AC).

Q: What types of media can the 3000MRS measure pressure for?

A: This device is suitable for monitoring the differential pressure of steam, oil, and gas, making it ideal for various industrial fluid process applications.

Q: When should the switch feature be used, and what safety advantages does it provide?

A: The switch feature is valuable when you need to trigger alarms or control equipment once preset pressure thresholds are reached. This helps improve operational safety by ensuring timely responses to abnormal pressure conditions.

Q: Where can the Dwyer 3000MRS be installed, and what mounting options are available?

A: It is designed for both panel and surface mounting. The included mounting hardware and installation manual facilitate quick and secure setup in control panels, machinery, or process areas.

Q: What is the process for connecting the pressure lines and electrical wiring to the device?

A: The 3000MRS features 1/8" female NPT ports for high and low pressure connections and screw terminals for electrical linkage. Follow the supplied installation manual for step-by-step guidance on safe and proper connections.

Q: How does the device benefit industrial applications in terms of reliability and maintenance?

A: With its robust construction, excellent repeatability, absence of sensor drift, and lack of external gauge power requirements, downtime is minimized and reliability is maximized, making it suitable for continuous, maintenance-light operation.

Q: What accessories are included with the product and how do they assist in setup?

A: The unit comes with a full set of mounting hardware and an installation manual, ensuring users have the necessary tools and instructions for correct and efficient setup.

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