The pressure transmitter reflects the magnitude of the difference between the high-pressure side pressure and the low-pressure side pressure. In addition to measuring pressure, you can also measure the liquid level in the device, measure the density of the medium, and measure the flow rate. And how is the pressure transmitter installed and repaired during actual application?
The pressure transmitter is a detection device that can convert the pressure variable into a standard output signal according to a certain ratio.
The principle is roughly: the pressure signal of the measured medium is converted into a current (4-20mA) electronic signal to supply DCS system, indication and process adjustment. The pressure and current have a linear relationship, which is generally proportional. It reflects the magnitude of the difference between the high-pressure measured pressure and the low-pressure side pressure.
Whether it is too close to the valve or pump during installation, because the opening and closing of the valve and the start and stop of the pump will impact the pressure transmitter sensing diaphragm, resulting in damage to the pressure transmitter diaphragm;
Whether there are corrosive gases, solid particles (dust), etc. on the site, in corrosive or dusty places, the pressure transmitter should be cleaned regularly, or even a pressure transmitter with good corrosion resistance or dust prevention effect;
High-pressure hydraulic equipment often impacts and damages the transmitter diaphragm. At this time, a special damper (or a small damping original on the pressure transmitter) can be installed to reduce the instantaneous impact force and protect the pressure diaphragm.
Key points for the use of pressure transmitters
When measuring gas pressure, the pressure port should be opened at the top of the process pipeline, and the transmitter should also be installed at the top of the process pipeline, so that the accumulated liquid can be easily injected into the process pipeline;
The pressure guiding pipe should be installed in a place with small temperature fluctuation;
When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected, and the working temperature of the transmitter should not exceed the limit;
When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures to prevent the liquid in the pressure port from expanding due to icing volume and leading to sensor damage;
When measuring the liquid pressure, the installation position of the transmitter should avoid the impact of the liquid (water hammer phenomenon) to prevent the sensor from being damaged by overpressure;
When wiring, pass the cable through the waterproof connector (accessory) or the flexible tube and tighten the sealing nut to prevent rain water and other leakage through the cable into the transmitter housing.