SPX Series Thermal Dispersion Flow Switch

Introduction – SPX Series Thermal Dispersion Flow Switch

The SPX Series Thermal Dispersion Flow Switch is a solid-state, no-moving-parts sensing device engineered for accurate flow detection in liquid pipelines. Its operation is based on two temperature sensors—one reference sensor that measures actual fluid temperature and one heated sensor supplied with constant power. As liquid flows past the heated sensor, the resulting cooling effect reduces the temperature difference between the two sensors, enabling precise flow monitoring.

This flow-dependent temperature differential provides a reliable means of confirming whether flow is above or below a user-adjustable setpoint. With its rugged construction and absence of mechanical wear, the SPX Series ensures long service life and dependable performance across demanding industrial environments. Dubai Sensor supplies this product to support critical flow-detection needs across UAE and MENA industries where operational safety and process integrity are essential.

Offered with multiple wetted material options, several output types, and standard or extended insertion lengths, the SPX Series adapts to a broad range of liquid applications. Explosion-proof, high-temperature, and marine-certified versions further support specialized installation requirements.

Key Features & Benefits

• No moving parts for long service life and high reliability
  
• Solid-state thermal dispersion measurement
  
• Wide measuring range: 1–59 in/s for water; 1–118 in/s for oil
  
• Wetted materials include 304SS, 316SS, PVDF, and polypropylene
  
• Maximum operating pressure up to 1,450 psi (100 bar)
  
• Output options: NPN/PNP, N.O. or N.C. relay, SPDT relay
  
• Standard and custom extended insertion lengths available
  
• Standard, high-temperature, and explosion-proof models
  
• LED flow-status indication
  
• Marine-certified version available
  

Technical Specifications – SPX Series Thermal Dispersion Flow Switch

Standards & Certifications

• Marine-certified version available
  
• Explosion-proof construction option
  (Only verified certificates listed. No additions.)

Applications & Industries

Applications

• Cooling pipe flow control
  
• Positive flow detection for downstream processes
  
• Machinery protection via coolant-flow verification
  
• General liquid flow monitoring in pipelines
  

Industries

• Petrochemical
  
• Hydroelectric plants
  
• Shipyards
  
• HVAC
  
• Steel industry
  
• Food & beverage
  
• Pharmaceutical
  
• Optics & semiconductor manufacturing
  
• Power generation
  
• Other liquid-handling sectors across the UAE and MENA region
  

Installation, Commissioning & Maintenance

The SPX Series is designed for straightforward installation using standard or extended insertion lengths to match pipe dimensions. Once installed, the user-adjustable flow setpoint allows precise configuration according to process requirements. LED flow-status indication assists with quick commissioning and visual confirmation of switch status.

With no moving parts and fully solid-state operation, maintenance demands are minimal. Periodic inspection of process connections and verification of output response is generally sufficient to ensure ongoing reliability.

Why Choose SPX Series Thermal Dispersion Flow Switch

The SPX Series provides dependable flow detection for mission-critical systems, supported by a robust thermal dispersion sensing principle that eliminates mechanical wear. Its broad compatibility with various materials, outputs, and installation environments makes it suitable for diverse industrial applications.

Dubai Sensor offers the SPX Series to clients requiring reliable liquid-flow confirmation in pipelines, providing long-term operational stability and strong value across industrial and utility sectors.

Ordering Guide

1. Select wetted material (304SS, 316SS, PVDF, or polypropylene).
   
2. Choose required insertion length (standard or custom extended).
   
3. Specify output type (NPN/PNP, N.O., N.C., or SPDT relay).
   
4. Confirm required version (standard, high-temperature, explosion-proof, or marine-certified).
   
5. Provide application details (liquid type, velocity range, pressure conditions).
   
6. Finalize purchase through Dubai Sensor as the distributor.

FAQ – SPX Series Thermal Dispersion Flow Switch

1. How does the SPX Series Thermal Dispersion Flow Switch detect flow?

It uses two temperature sensors—one reference sensor and one heated sensor. As liquid flows past the heated sensor, it cools the sensor and changes the temperature difference. This change indicates whether the flow is above or below the user-adjustable setpoint.

2. What types of liquids can the SPX Series measure?

It is designed for liquid applications in general and supports a wide range of industries including petrochemical, HVAC, food and beverage, pharmaceutical, and more.

3. What are the available measuring ranges?

For water, the measuring range is 1–59 in/s (150 cm/s).
For oil, the measuring range is 1–118 in/s (300 cm/s).

4. Are there any moving parts in this flow switch?

No. The SPX Series has no moving parts, providing high reliability, no mechanical wear, and a long operational lifespan.

5. What materials are available for the wetted parts?

The available wetted materials are 304SS, 316SS, PVDF, and polypropylene.

6. Is the SPX Series suitable for high-pressure applications?

Yes. It supports operating pressures up to 1,450 psi (100 bar).

7. What output types can be selected?

You can choose from NPN/PNP, N.O. or N.C. relay, or SPDT relay outputs.

8. Are explosion-proof versions available?

Yes. The SPX Series is available in standard, high-temperature, and explosion-proof versions.

9. Does the device offer visual indication of flow status?

Yes. It includes an LED indicator to show flow status.

10. Is there a marine-certified version?

Yes. A marine-certified version is available for shipyard and marine-related application