SENSORS FOR GAS FLOW

• FS - FLOW SENSORS

  Our FS7 is a standard solution optimal for various gas flow applications. The FS7.4W is specially designed for applications with temperatures up to 400 °C. Both of the thermal gas flow series works on the anemometric principle and consists of two platinum resistors on one chip which is immersed in a flow channel- a small resistance which is used as heater and a high resistance which is used for the measuring of the gas temperature. The anemometric principle is based on a function of the flow speed and utilizes heat transfer principles to determine the flow velocity. The heater is set to a constant temperature difference above the ambient temperature detected by the temperature sensor. The FS2 works on the calorimetric principle and offers the possibility to detect flow speed and direction. 

   As flow passes across the heater, heat is carried from the heater to the medium, and energy is transferred into the fluid and the temperature difference decreases. Consequently the power on the heater has to be increased to reset the “original” temperature difference. As flow increases, so does the amount of heat that is transferred. The power needed to adjust the temperature difference is therefore a measure of the flow passing the sensor. By knowing the heat transfer, the flow rate can be determined from the amount of voltage compensation needed to maintain a constant temperature differential.

  The heater and the temperature sensor are made of platinum and feature excellent long term stability. 

  The FS2 thermal gas flow sensor works on the calorimetric principle and consists of four platinum thin film resistors - one platinum thin film resistor used as heater, two platinum thin film resistors used to detect the flow speed and flow direction and a temperature sensor for ambient temperature measurement. The heater is surrounded by two temperature sensors. As flow passes across the sensor, heat is carried from the sensor to the medium. As flow increases, so does the amount of heat that is transferred. This leads in an output signal which is a function of flow speed and direction. By knowing the heat transfer, the flow rate can be determined from the amount of voltage compensation needed to maintain a constant temperature differential. In no flow condition, these two resistors are heated up equally. If flow appears, one of them is cooled more than the other, depending on flow direction.

• FS7 - Optimal for applications requiring a high sensitivity up to +150 °C

   

  
• FS7.4W - Optimal for applications requiring a high sensitivity up to +400 °C

   

  
• FS2 - Optimal for measuring gas flow and direction

   

  
• MFS - MICROFLOW SENSORS

  The MFS thermal gas flow sensor consists of four platinum thin film resistors. The sensor can work on both the anemometric and the calorimetric principle, due to the special design and the choice of platinum as resistor material.  

  The sensor features a heater, designed as double element. The heater is surrounded from two high ohmic resistors on the left and right hand side of the heater. These resistors are placed on a membrane layer to reduce the thermal mass of the system. A further resistance allows the measurement of the gas temperature.

  The resistors on the membrane can be connected in a bridge circuit. Therefore flow speed and flow direction can be detected. Due to the membrane system, the thermal mass is reduced to the minimum; resulting in a very fast response time (<10 ms) and low power consumption.

  Different sensor designs allow the best performance in terms of sensitivity for the flow range of the application in addition with a wide possibility of excitation modes.

• MicroFlow - Optimal for very high and low flow rates, ultra-fast measuring and detection of flow direction

   

   

  SENSORS FOR GAS FLOW

  The IST AG thermal mass flow sensor combines the benefits of small dimensions with a robust design and easy adaptation in various applications and housings. IST AG offer considerable solutions for various flow applications and the option to customize parameters to meet application specific requirements at a beneficial pricing. The IST AG gas flow portfolio consists of sensors based on both anemometric and calorimetric principles.

  Development channels guarantee the best possible adaptation of the sensors, whether in terms of dynamic range, response time, directional detection or ambient conditions.

  • FS - FLOW SENSORS

    Our FS7 is a standard solution optimal for various gas flow applications. The FS7.4W is specially designed for applications with temperatures up to 400 °C. Both of the thermal gas flow series works on the anemometric principle and consists of two platinum resistors on one chip which is immersed in a flow channel- a small resistance which is used as heater and a high resistance which is used for the measuring of the gas temperature. The anemometric principle is based on a function of the flow speed and utilizes heat transfer principles to determine the flow velocity. The heater is set to a constant temperature difference above the ambient temperature detected by the temperature sensor. The FS2 works on the calorimetric principle and offers the possibility to detect flow speed and direction. 

     As flow passes across the heater, heat is carried from the heater to the medium, and energy is transferred into the fluid and the temperature difference decreases. Consequently the power on the heater has to be increased to reset the “original” temperature difference. As flow increases, so does the amount of heat that is transferred. The power needed to adjust the temperature difference is therefore a measure of the flow passing the sensor. By knowing the heat transfer, the flow rate can be determined from the amount of voltage compensation needed to maintain a constant temperature differential.

    The heater and the temperature sensor are made of platinum and feature excellent long term stability. 

    The FS2 thermal gas flow sensor works on the calorimetric principle and consists of four platinum thin film resistors - one platinum thin film resistor used as heater, two platinum thin film resistors used to detect the flow speed and flow direction and a temperature sensor for ambient temperature measurement. The heater is surrounded by two temperature sensors. As flow passes across the sensor, heat is carried from the sensor to the medium. As flow increases, so does the amount of heat that is transferred. This leads in an output signal which is a function of flow speed and direction. By knowing the heat transfer, the flow rate can be determined from the amount of voltage compensation needed to maintain a constant temperature differential. In no flow condition, these two resistors are heated up equally. If flow appears, one of them is cooled more than the other, depending on flow direction.

  • FS7 - Optimal for applications requiring a high sensitivity up to +150 °C

     

    
  • FS7.4W - Optimal for applications requiring a high sensitivity up to +400 °C

     

    
  • FS2 - Optimal for measuring gas flow and direction

     

    
  • MFS - MICROFLOW SENSORS

    The MFS thermal gas flow sensor consists of four platinum thin film resistors. The sensor can work on both the anemometric and the calorimetric principle, due to the special design and the choice of platinum as resistor material.  

    The sensor features a heater, designed as double element. The heater is surrounded from two high ohmic resistors on the left and right hand side of the heater. These resistors are placed on a membrane layer to reduce the thermal mass of the system. A further resistance allows the measurement of the gas temperature.

    The resistors on the membrane can be connected in a bridge circuit. Therefore flow speed and flow direction can be detected. Due to the membrane system, the thermal mass is reduced to the minimum; resulting in a very fast response time (<10 ms) and low power consumption.

    Different sensor designs allow the best performance in terms of sensitivity for the flow range of the application in addition with a wide possibility of excitation modes.

  • MicroFlow - Optimal for very high and low flow rates, ultra-fast measuring and detection of flow direction

     

    
  • MIDAS M1.x - Optimal for easy integration and ultra-fast measuring of gas flow and direction