Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa Specification

Sensor Type
Photohelic Differential Pressure Sensor

Outer Size
Enclosure Size Approx. 4-1/2 Diameter

Display
Analog (with Setpoint Switches)

Seal Material
Silicone

Thread
1/8 NPT Female

Grade
Industrial

Material
Polycarbonate Housing with Aluminum Internals

Dial Material
Aluminum with Printed Scale

Pointer Material
Anodized Aluminum

Processing Type
Electromechanical Integration

Diameter
114 mm (4.5 inches)

Glass Size
Standard Clear (Dome Lens)

Mount Type
Surface and Flush Mount

Scale Range
0 to 1 kPa

Accuracy
±2% of Full Scale

Accessories
Instruction manual, mounting hardware

Repeatability
1% of full scale

Operating Temperature
20 to 140F (-6 to 60C)

Zero Adjustment
External

Electrical Connections
Screw terminals

Switch Type
Two SPDT relays (dual set-point)

Power Requirement
24 VAC or 120/240 VAC, depending on model

Enclosure Rating
IP54 (front only)

Switch Rating
5A @ 120/240 VAC

Application
Filter monitoring, clean room pressure, fan control, process control

Pressure Connections
High and Low ports, 1/8\\

Weight
0.7 kg (approximate)

Response Time
Instantaneous mechanical response

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa Trade Information

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

Main Export Market(s)
Asia

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa

Series 3000MR/3000MRS Photohelic Switch/Gage

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

Model	Description
3000MRS-1 kPa	Pressure Switch/Gage,Range 0-1 kPa, .02 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

Precise Differential Pressure Monitoring

The Dwyer 3000MRS delivers accurate differential pressure readings with a 2% full-scale accuracy and 1% repeatability. Its analog display provides clear visibility, while instant mechanical response ensures that pressure changes are detected and processed immediately, helping maintain optimal environmental conditions in your facility.

Rugged, Versatile Design for Industrial Use

Created for demanding industrial settings, this photohelic switch/gauge features a tough polycarbonate body with aluminum internals. The IP54 front enclosure safeguards against dust and water splashes, and flexible mounting optionssurface or flushaccommodate a variety of installation preferences, making it suitable for diverse pressure monitoring applications.

Reliable Electromechanical Integration

Combining analog indication with dual SPDT relay setpoints, the 3000MRS makes process control straightforward. Its electromechanical integration streamlines setup and usage, while external zero adjustment enhances on-site calibration. The gauge measures pressures in air and compatible gases, supporting critical control applications such as filter monitoring, fan control, and clean room management.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 1 kPa:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge operate?

A: The Dwyer 3000MRS operates by sensing differential pressure between its high and low 1/8" NPT ports, displaying the value on an analog gauge, and activating two independently adjustable SPDT relay switches if setpoints are exceeded. This dual functionality enables both visual monitoring and automatic process control.

Q: What applications are suitable for the 3000MRS model?

A: This gauge is ideally suited for filter monitoring, clean room pressure management, fan control, and general process control in industrial environments, where quick response and reliable switching are essential for maintaining system performance and safety.

Q: Where should the Photohelic 3000MRS be installed for accurate readings?

A: Install the gauge at a location representative of the true differential pressure you wish to monitor, connecting the high and low ports to the appropriate areas. It can be surface-mounted or flush-mounted in a panel, and is designed to be used in environments within its specified operating temperature (20 to 140F / -6 to 60C).

Q: What is the process for making electrical connections to this gauge?

A: Electrical connections are made to screw terminals on the unit. Power can be supplied at either 24 VAC or 120/240 VAC (depending on the model), and the SPDT relay outputs can be wired to external control devices or alarms. Ensure power is disconnected during installation for safety.

Q: How is zero adjustment handled on this device?

A: External zero adjustment allows you to calibrate the gauge while it remains installed, ensuring accurate and reliable readings in your specific application. Simply follow the procedure in the instruction manual using the adjustment control provided.

Q: What are the benefits of using the Dwyer 3000MRS over other pressure gauges?

A: The 3000MRS combines precise analog measurement, instantaneous response, and dual set-point control, all in a robust industrial housing. Its versatility, reliable performance, and easy integration into control systems make it an excellent choice for critical air and gas pressure monitoring tasks.

Q: When should you consider maintenance or recalibration of the 3000MRS?

A: Regular maintenance and periodic recalibration should be considered according to your facilitys requirements or whenever readings appear inconsistent. Cleaning the external lens, checking for leaks at the ports, and confirming zero adjustment help maintain optimal performance over time.

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