Applied To Negative Pressure Transmitters In Medical And Industrial Vacuum Systems

A negative pressure transmitter is essentially a pressure transmitter that measures pressure lower than the local atmospheric pressure (i.e., vacuum or negative pressure).

1. Single-port measurement: Usually, there is only one process connection port, with its internal sealed vacuum chamber serving as the reference. This is different from the dual-port differential pressure transmitter.
2. Negative range: Its measurement range extends from 0 (atmospheric pressure reference point) to a negative pressure value, such as 0 to -100 kPa, or -0.1 to 0 MPa.G.
3. High accuracy: Particularly in vacuum proximity measurements, high sensitivity and stability are required.
4. Pollution prevention: When measuring gases, especially those that may contain steam or particles, it is necessary to prevent sensor contamination, otherwise performance will decline.

• Industrial vacuum systems:
  • Vacuum pump/vacuum furnace monitoring: Monitor the suction pressure of vacuum pumps and control the process vacuum degree (such as sintering, coating, heat treatment).
  • Vacuum drying: In food, and chemical industries, monitor the vacuum degree inside the drying box to ensure product quality and process efficiency.
• Medical and laboratory equipment:
  • Central negative pressure suction system: In hospital wards and operating rooms, monitor the pressure of the negative pressure pipeline to ensure the stability and safety of operations such as suctioning and drainage.
  • Vacuum blood collection tube manufacturing/usage environment: Monitor the preset vacuum degree of blood collection tubes.
  • Freeze dryer (freeze drying): Monitor the vacuum degree inside the drying chamber, which is a core parameter of the freeze-drying process.
• HVAC and building automation:
  • Building negative pressure control: In biological laboratories, hospital isolation wards, clean rooms, etc., maintain a negative pressure in the room relative to the corridor or outside to prevent the leakage of contaminants.
  • Boiler furnace negative pressure control: This is a key safety parameter, maintaining an appropriate negative pressure to ensure the smooth extraction of combustion exhaust gases and prevent flame blowout.
• Packaging industry:
  • Vacuum packaging machine: Monitor the vacuum degree during the packaging process to ensure food preservation and packaging quality.
• Process industry:
  • Towers and containers: Some distillation towers or reaction vessels need to operate under negative pressure to lower the boiling point, requiring precise negative pressure control.

In short, a negative pressure transmitter is a one-sided instrument that focuses on measuring the "degree of vacuum", while a micro differential pressure transmitter is a two-sided instrument that focuses on measuring the "small pressure difference between two points". Both are precise tools in the field of pressure measurement, but they address process issues with different emphases.