Problems with the installation of negative pressure transmitters

It makes it easy to clear the pipes when they get blocked.

I’m confused. In the picture, which one is the \"negative pressure transmitter\" you’re talking about – the red arrow or the green arrow?

I think what the green arrow is pointing to is a damping cylinder, whose function is to smooth out pressure fluctuations and shocks. By doing this, the pressure delivered to the diaphragm of the pressure gauge experiences less fluctuation, resulting in more stable changes.

If the temperature is not high, a single-flange gauge pressure transmitter will also work.

Negative pressure is measured with the ambient atmospheric pressure as the zero point. . . As for the ambient atmospheric pressure, it changes gradually throughout the time, fluctuating by 200 Pa per day, with a difference of 3000 Pa between winter and summer. Gauge pressure is measured with theoretical zero pressure, using absolute vacuum as the reference point. . . To convert the absolute pressure value into a negative pressure value, it is first necessary to know the real-time value of the atmospheric pressure at the location where the gauge is installed; secondly, a real-time subtractor with signal reading and acquisition capabilities is required. :Lol, all roads lead to Beijing; taking a detour isn’t a mistake. . . You can also attach a big slingshot and aim precisely to shoot you into the sky; then you’ll fall back down. In front of Tiananmen Square there’s a small bridge with white railings – I think it’s called Jinshui Bridge? Are there any canals? Well, if not, just dig a hole – you drop in, and you fall freely towards Beijing City; the water supports you, the hole holds you, and physics takes care of everything – absolute pressure = atmospheric pressure + gauge pressure; all errors are the result of metrological considerations. . . . . . However, eternal correctness is a bit far away. As ordinary people, when we learn skills and knowledge, we are looking for shortcuts.