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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa Specification

Thread
1/8 NPT Female

Outer Size
Approximately 4.75 in (121 mm) diameter

Seal Material
Buna-N

Sensor Type
Differential Pressure Switch/Gauge

Display
Analog

Grade
Industrial

Material
Die-cast aluminum housing, Acrylic cover

Dial Material
Acrylic

Pointer Material
Aluminum

Processing Type
Photohelic (Photoelectric switching)

Diameter
4.75 in (121 mm)

Glass Size
4 in (101 mm) viewing area

Mount Type
Surface or flush panel mount

Scale Range
0 to 250 Pa

Accuracy
2% of full scale

Finishing
Powder coated housing

Measure Pressure Of
Air and compatible gases

Accessories
Mounting hardware, Instruction manual, Electrical connectors

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

Series 3000MR/3000MRS Photohelic Switch/Gage

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

Model	Description
3000MRS-250 Pa	Pressure Switch/Gage,Range 0-250 Pa, 5.0 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 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

Overview and Advanced Design

The Dwyer 3000MRS combines the benefits of a differential pressure gauge with the capabilities of a relay switch. With an easy-to-read analog display and precise 2% full-scale accuracy, this device is perfect for real-time monitoring and automated control tasks. Its durable die-cast aluminum housing with powder-coated finish and an IP54 rating provide resilience in harsh industrial settings.

Versatile Mounting and Compatibility

This Photohelic switch/gauge supports both surface and flush panel mounting, making it adaptable to a range of installation requirements. Designed for air and compatible gases, it features a 1/8 NPT female thread for secure connections, and is supplied with all necessary hardware for straightforward setup.

Electrical and Safety Compliance

Ready for demanding electrical environments, the 3000MRS uses SPDT switching with a 10A contact rating, supporting 120/240 VAC operations. It meets RoHS compliance standards, ensuring it is free from hazardous substances, and its operating temperature range of -18 to 60C allows reliable performance across various climates.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa:

Q: How do I install the Dwyer 3000MRS Photohelic Switch/Gauge?

A: The 3000MRS can be installed using either a surface or flush panel mount. All necessary mounting hardware and instructions are provided. Ensure proper electrical connections using the screw terminal block and secure the device with the included accessories. Follow the instruction manual for step-by-step guidance.

Q: What environments and applications are suitable for this gauge?

A: This model is designed primarily for industrial settings, monitoring differential air pressure or compatible gases in processes like HVAC systems, clean rooms, or filtration equipment. Its IP54 enclosure and robust aluminum housing make it suitable for harsh indoor environments.

Q: When should the device be used for switching versus monitoring only?

A: Use the device for switching when you require automated control, such as activating alarms or ventilation based on pressure changes. For monitoring, utilize its analog display to read current differential pressure without engaging the relay switch; both functions can operate simultaneously.

Q: Where can I connect the electrical supply and output signals?

A: Connect the electrical supply (120/240 VAC, 50/60 Hz) and output signals to the screw terminal block, as indicated in the included wiring diagram. The SPDT relay outputs allow integration with control panels or other equipment.

Q: What is the measurement process and accuracy for this instrument?

A: The 3000MRS uses a differential pressure sensor with a Photohelic (photoelectric switching) mechanism for instantaneous relay response. The analog gauge displays pressure up to 250 Pa with an accuracy of 2% full scale.

Q: How does using this device benefit industrial operations?

A: Integrating this device enhances safety and efficiency by providing both real-time visual pressure monitoring and automatic control responses. Its durable construction, reliable switching, and ease of installation minimize downtime and maintenance needs.

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