Air Pressure Sensors & Absolute Pressure Gauges

What types of pressure sensors do we have?

• Pressure transducer / pressure sensor for gaseous media: These pressure sensors are used to measure relative, absolute and differential pressures. They are typically used in ventilation or air-conditioning ducts. The values can be read out directly at the sensor or, integrated into the building automation system, passed on to a control system.
• Transducer / pressure sensor for atmospheric air pressure: The measurement of these values is particularly important for weather observation and weather forecasting.
• Pressure regulator / switch for volume flow: These sensors ensure that the desired flow rate is maintained in the duct. If the volume flow exceeds or falls below a defined limit value, the sensor triggers an action. For example, the sensor causes a valve to open or signals a pressure fault.
• Pressure transducer / pressure sensor for liquid media: These sensors are used to measure differential pressures or fill levels in water pipes, storage tanks or heating systems.

 

Where are sensors for measuring air pressure used?

Our pressure sensors are used to measure overpressure, negative pressure or differential pressure as well as the volume flow in clean air or other gaseous, non-flammable media. The pressure sensor is typically used in clean rooms, in medical and filter technology, in ventilation ducts or air conditioning ducts. Our pressure sensors are also used in spray booths and large kitchens, for filter monitoring and level measurement or for controlling frequency converters.

 

How does an air pressure sensor work?

The pressure sensors are equipped with tubes to pick up air for the respective application and are mounted directly on the ventilation duct. With the help of these tubes, the air flow is directed into the sensor.
Here, the current air pressure in the system (overpressure, negative pressure), the intensity or speed of the air flow in the duct (volume flow) or the pressure difference in front of and behind an installed air filter (differential pressure) is measured by using a membrane. Internally, the sensor converts the measured values into Bar (bar), Pascal (Pa) or Hektopascal (hPa).
If the sensor is integrated into the building automation system, the measured values can trigger a corresponding action. The pressure sensor transmits an error or alarm message to the control system, which can then be read out by the operator - or actively triggers the corresponding regulation of the air flow directly, for example.
 

What is the difference between bar, pascal and hectopascal?

Different units are used in pressure measurement.
Pressure sensors for measuring air pressure from S+S mainly output the measured pressures in "pascal", as these are usually low pressure values in closed systems. One pascal (Pa) is the pressure that a force of one newton exerts steadily on an area of one square meter (m²).
The unit "bar" is often used to measure large pressures. For example, atmospheric air pressure at sea level is around 1 bar (= 1,000 hPa). One bar is the pressure that a force of ten newtons exerts steadily on an area of one square centimeter.
This results in the following conversion:
1 bar = 100,000 Pa | 1 bar = 1,000 hPa
1 Pa = 0.000 01 bar | 1 hPa = 0.001 bar