How to measure a vacuum of 200 Pascals? Is there such a gauge?

Just buy a vacuum pressure gauge

This post was last edited by liu530014416 on 2023-12-8 at 11:38. The vacuum level of 200 Pa you mentioned – I’m not sure whether that refers to -99.8 KPa or -0.2 KPa. For -99.8 KPa, a pressure transmitter or gauge will suffice; just keep using the vacuum pump to draw air out. At such a pressure level, it’s already a complete vacuum, so there’s no need for any further control regarding pressure – keep pumping away. -0.2kpa~~~ You can handle it by yourself

Measuring relatively low vacuum levels (such as 200 pascals) can usually be done using common vacuum measurement instruments, such as pressure sensors, differential manometers, and vacuum gauges. In vacuum technology, pressure ranges are divided into several distinct categories: atmospheric pressure (approximately 101325 Pascals), low vacuum (from atmospheric pressure to 1 Pascal), medium vacuum (from 1 Pascal to 10^-3 Pascals), high vacuum (from 10^-3 Pascals to 10^-7 Pascals), and ultra-high vacuum (below 10^-7 Pascals). 200 pascals falls within the range of low vacuum, so measurement devices suitable for low vacuum can be used for measurements. Here are some types of devices used to measure low vacuum pressures: 1. Manometer: It measures vacuum by utilizing the difference between the known atmospheric pressure and the pressure in the area being measured. 2. Mechanical vacuum gauges: Such as Bourdon tube vacuum gauges, which measure pressure by detecting the deformation of elastic elements inside the container. 3. Electronic pressure sensors: They utilize changes in resistance, capacitance, or piezoelectric effects to detect pressure changes and convert them into electrical signals. 4. Thermal conductivity vacuum gauges: Such as thermocouple vacuum gauges or thermal resistance vacuum gauges, which measure the heat transfer between gas molecules and a heating element to determine the gas density and pressure. When selecting a vacuum gauge, ensure that its measurement range is suitable for the pressure range you need to measure (covering 200 pascals), and that it has sufficient resolution and accuracy. To obtain accurate measurement results, it may also be necessary to calibrate the vacuum gauge to ensure that it provides precise readings at the corresponding pressures. In addition, the temperature, type of gas, and other environmental factors during measurement can also affect the accuracy of the measurements; these factors must all be taken into account when performing vacuum measurements. .

The poster mentioned measuring vacuum; it should refer to an absolute pressure of 200 Pa, not a gauge pressure of -200 Pa. With an absolute pressure range of 200 Pa, the level of vacuum is already quite high, and a specialized vacuum pressure gauge is required

Hello, thank you for getting it fixed. Where can I find such a pressure gauge?

For installing pressure gauges at the site, a range of -100 to 100 is suitable; accuracy isn’t critical there, and -100 represents no special operating conditions. Models from Yokogawa, Honeywell, Rosemount, as well as domestic brands, can all be used

-99.8Kpa？ A regular transmitter will do, right?

Isn’t that just a gauge pressure transmitter? Is 200 Pa the range? It’s quite difficult to create gauge pressure transmitters with such a small range