Explosion-proof flow switch
Explosion-proof flow switch
Explosion-proof flow switch
Explosion-proof flow switch
Explosion-proof flow switch
Explosion-proof flow switch

Explosion-Proof Flow Switch-SI 33EX 150 with Display

The Explosion-Proof Flow Switch is a measuring instrument specially used in explosive industries. When the flow rate is higher or lower than the set value, the flow switch will send a signal or alarm. This product comes with a data display. It can visually observe the flow change. It is suitable for flammable and explosive occasions. It can monitor the flow changes of gas, liquid and oil.

  • Support customization
  • OEM
  • Prevent winding of winding objects in the medium
  • Digital display of fluid flow rate percentage
  • Optional switch output and analog 4- 20mA output
  • Fully waterproof housing design: IP67
  • Adjust the set point at will
  • Optional anti-corrosion type
  • Highest pressure resistance: 100Bar
  • Optional relay, analog output or analog switch integrated output.
  • No moving parts
  • Maintenance-free
  • Easy to install

Explosion-Proof Flow Switch Introduction

The Explosion-Proof Flow Switch is a switch device that uses the temperature change difference of the probe to monitor the flow rate of the fluid.

The working principle of the thermal diffusion flow switch: through the temperature difference change between the heating sensor and the heat sensor, the heat change caused by the fluid flow is converted into an electrical signal, thereby triggering the switch action. The probe adopts an anti-scaling coating, which can effectively prevent the adhesion of scale, rust and other dirt in the pipeline. It has more stable work.

Monitoring Functions:

  • Media flow
  • Reduce/increase flow rate
  • Media presence/absence
  • Media flow/stationary
  • Monitor the flow rate of fluid in the pipeline, and flow interruption monitoring
  • Prevent the pump from running dry

Explosion-proof flow switch

Read More about Flow Switch.

Explosion-Proof Flow Switch Parameters

Setting range Water: 1-150cm/s, Oil: 3-300cm/s, Air: 20-2000cm/s
Measurement medium Water, oil, gas and other media compatible with stainless steel
Output type PNP/NPN/Relay, /NO/NC can be set
4-20mA
Power supply 24V±20%DC
Power on Maximum 400mA (PNP or NPN type); Maximum 3A 24VAC/DC (relay type)
No-load current Maximum 80mA
Flow indication LED row (6 pieces), or Digital display
Setting method Button setting
Withstand voltage range 100bar (maximum customizable 40MPa)
Medium temperature change ≤4℃/s
Response time 1~13s, typical value 2s
Initialization time About 8s
Electrical protection Reverse phase, short circuit, overload protection
Explosion-proof grade ExdⅡCT6 Gb
Protection grade IP67
Medium temperature -20-100°C (customizable -60~150)
Ambient temperature -20-80
Storage temperature -20-100°C
Wiring method Terminal connection M20*1.5
Material Probe: stainless steel (customizable 316L/titanium alloy/PTFE material);
Housing: cast aluminum
Repeat accuracy ±2%

Button Setting:

Menu name Function introduction Parameter selection range
SP1 Switch 1 action value 2%~100%FS
hs1 Switch 1 reset value 0%~98%FS
oUt1 Switch 1 output type no/nc
SP2 Switch 2 action value 2%~100%FS
hs2 Switch 2 reset value 0%~98%FS
oUt2 Switch 2 output type no/nc
FAC Display value coefficient 0.1~99.9
CAL Calibration parameter 0~9999
END Exit menu

 

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Sino-Inst’s explosion-proof flow switch can support customization. It can adapt to computing environments. If necessary, please contact us. Sino-Inst will recommend the most suitable measurement solution for you.

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Explosion-Proof Flow Switch Applications

The Explosion-Proof Flow Switch can also be used to control the flow of various fluid media. The stability of the explosion-proof flow switch are essential to ensure production safety and the normal operation of equipment. It plays an indispensable role in many industries with extremely high safety requirements.

Petrochemical industry:

From the extraction and transportation of crude oil to the production of various chemical products, every link is accompanied by the risk of flammability and explosion.

In the process of oil refining, explosion-proof flow switches are installed in the pipeline system to monitor the flow of crude oil, refined oil and various chemical raw materials in real time.

In the petrochemical industry, explosion-proof flow switches have a wide range of applications. It can be used to protect equipment such as pumps and engines from damage caused by low flow or interruption, control the sequential operation of equipment, and automatically start auxiliary pumps and engines.

In chemical production, the production and transportation of important chemical raw materials such as ethylene and propylene. Explosion-proof flow switches ensure safety. It ensures that the flow of materials during the reaction is accurate and stable.

Once the flow is abnormal, such as a sudden drop in flow due to pipeline blockage, or excessive flow due to valve failure. It can immediately sound an alarm. Notify the staff to deal with it in time. Avoid pipeline rupture and leakage caused by flow problems. Prevent serious accidents such as explosions and fires.

thermal dispersion flow switch

 

Power industry:

In thermal power plants, explosion-proof flow switches are used to monitor the flow of fuel and gas. Once the flow is abnormal, it may lead to incomplete combustion, produce a large amount of harmful gases, and even cause an explosion.

In nuclear power plants, it is crucial to monitor the flow of coolants. The stability of coolant flow is the key to ensuring the normal operation and safe cooling of nuclear reactors.

Metallurgical industry:

In the process of steel smelting, a large amount of flammable and explosive gases, such as oxygen and coal gas. They are required to participate in the reaction. The explosion-proof flow

 

 switch is installed on the gas transmission pipeline to provide a stable gas source for the smelting process.

At the same time, it can detect flow abnormalities in time. Prevent explosion accidents caused by gas leakage. Ensure the safety and efficiency of metallurgical production.

Pharmaceutical industry:

In the process of drug production, flammable and explosive organic solvents and chemical raw materials are often involved. Explosion-proof flow switches are used to monitor the flow of these materials to ensure the safety and quality stability of the drug production process.

In some drug synthesis reactions, precise control of the flow of raw materials is the key to ensuring the smooth progress of the reaction and product quality. Explosion-proof flow switches allow pharmaceutical companies to produce high-quality drugs in a safe environment.

The explosion-proof flow switch is key equipment to ensure safe production in dangerous industrial environments. It is the guardian of industrial safety. It is the guarantee of a stable production operation. Every link of it embodies the wisdom of science and technology and safety.

More Detail

What is an Explosion Proof Flow Switch?

An explosion-proof flow switch is a flow switch used in hazardous areas. Hazardous areas refer to places where fire or explosion may occur due to the presence of flammable gases, liquids, steam, dust or fibers. Since these areas are inherently dangerous. Therefore, the equipment used in these places must be explosion-proof certified.

Explosion-proof flow switches can be widely used for flow detection in flammable and explosive places such as petroleum, chemical, electric power, and metallurgy. The explosion-proof flow switch is designed based on the L.V. King heat exchange principle. A flow sensor is installed at the front end, and there are two probes in the part in contact with the medium.

Explosion-proof flow switch

What is a Thermal Dispersion Sensor?

A thermal diffusion sensor is a sensor that measures the time required for heat to diffuse in silicon. It uses the characteristic that the thermal diffusivity of bulk silicon changes with temperature to measure heat by measuring temperature changes.

This sensor provides better temperature sensing performance in modern CMOS processes and is suitable for thermal management of large digital chips.

Explosion-proof flow switch

 

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