Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM Specification

Seal Material
Buna-N

Grade
Industrial

Outer Size
Approx. 109 mm Diameter x 104 mm Depth

Thread
1/8 Female NPT

Sensor Type
Photohelic (Electromechanical) Differential Pressure Switch/Gauge

Bourdon Tube
Not Applicable (Diaphragm Based)

Display
Analog with Dual Set Point Dials

Material
Case: Polycarbonate, Diaphragm: Buna-N ; Internal Parts: Aluminum, Brass

Dial Material
White Aluminum with Black Markings

Pointer Material
Black Anodized Aluminum

Processing Type
Injection Molded Case

Diameter
109 mm (Front Flange OD)

Glass Size
Clear Polycarbonate Front Window

Mount Type
Surface/Panel Mount

Scale Range
0 to 20 cm (0 to 200 mm) of Water Column

Accuracy
2% Full Scale

Accessories
Panel Mounting Kit, Instruction Manual, Set Screws

Switch Type
Mechanical Microswitch

Model
3000MRS-20CM

Power Supply
No external power required for gauge, switching is passive

Ingress Protection
IP52 (Front Debris Protection)

Min. Differential Pressure
0.05 cm H2O

Number of SPDT Switches
2

Electrical Rating
5A @ 120/240 VAC

Weight
Approximately 420 g

Maximum Pressure
25 psi (1.7 bar)

Application
Filter Monitoring, Fan Control, Duct Static Pressure, Clean Room Pressure Monitoring

Operating Temperature Range
-6.7 to 60C (20 to 140F)

Repeatability
1% of Full Scale

Response Time
Instantaneous Mechanical Response

Process Connection
Two 1/8" Female NPT High & Low Ports

Mounting Orientation
Vertical Preferred

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM Trade Information

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

Main Export Market(s)
Asia

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-20 CM	Pressure Switch/Gage,Range 0 - 20 CM, .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 Functionality for Enhanced Control

The Dwyer 3000MRS-20CM Photohelic Switch/Gauge combines pressure measurement and switching in one device. This allows users to monitor pressure via the analog dial and automate process control simultaneously using the dual SPDT microswitches. Its versatility supports applications from HVAC to cleanroom management, ensuring both safety and efficiency.

Simple Installation and Operation

With its vertical preferred mounting orientation and included panel mounting kit, setting up the Dwyer 3000MRS takes minimal effort. The device features dual set-point dials, allowing straightforward adjustment of switching thresholds. Its robust, injection molded polycarbonate housing provides durability, while the analog display ensures clear, immediate pressure readings.

FAQ's of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge operate without external power?

A: The gauge function operates mechanically through pressure changes, requiring no external power. The switching mechanism uses passive mechanical microswitches, which are actuated by the diaphragm movement inside the device.

Q: What types of media can the 3000MRS measure and control?

A: The 3000MRS Photohelic Switch/Gauge is suitable for monitoring and controlling the pressure of steam, oil, and gas in various industrial systems.

Q: When should I use both SPDT switches in an application?

A: Dual SPDT switches provide two control points; use both when you need separate on/off actions at different pressures, such as actuating a fan at one level and triggering an alarm at another.

Q: Where should the 3000MRS-20CM be installed for optimal performance?

A: Optimal operation is achieved with a vertical mounting orientation. It can be surface or panel mounted, making it versatile for installations in industrial panels, clean rooms, or ducts.

Q: What is the process for setting pressure set points on this gauge?

A: Adjust the dual set-point dials on the analog display to your desired pressure thresholds. These dials allow precise calibration for switching at specific pressure levels, making setup intuitive and quick.

Q: How does the device benefit filter and fan control applications?

A: By providing accurate real-time pressure monitoring and instantaneous switching, the 3000MRS helps maintain system efficiency, prevents filter clogging, and automates fan operation-all contributing to energy savings and reduced maintenance.

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