Fuji pressure transmitter is a pressure measuring instrument, which is mainly used in working conditions that need to measure pressure, such as pipeline pressure, storage tank pressure, pressure in containers, etc.
Among them, FKP pressure transmitter and FKC differential pressure transmitter It is widely used in industrial process measurement sites.
Compared with FKH absolute pressure transmitters, FKH absolute pressure transmitters are used less. Many customers do not know how to choose a suitable Fuji FKH absolute pressure transmitter.
Today we will tell you how to choose Fuji absolute pressure transmitters. Pressure Transmitters.
Fuji FKH absolute pressure transmitter should be selected according to the measurement medium, use environment, etc.
Generally, the sensor contact medium is made of 316 stainless steel, which is suitable for measuring various non-corrosive gases, sewage, purified water, oil and other media. Anti-corrosion properties are required for sensors used in corrosive environments.
The pressure sensitive element of the sensor is made of anti-corrosion materials such as Hastelloy, Monel, and tantalum, which can be used in strong corrosive environments such as acid and alkali.
The selection of the sensor range is generally selected so that the working pressure value is 60% to 80% of the standard range value.
The overload pressure caused by the abnormal conditions that may occur in the entire measurement system should not exceed the very large overload allowed by the product.
The selection of absolute pressure transmitter should also consider the temperature and ambient temperature of the measuring medium, explosion-proof and protection level, as well as the accuracy requirements of the product, and sometimes whether the measuring medium or the impurities contained in it will cause blockage and other conditions.
Because the Fuji FKH absolute pressure transmitter measures the absolute pressure of the production process, and the general measurement range is very small, the pressure gauge range selected by the Fuji FKH absolute pressure transmitter is higher than that of the Fuji ordinary pressure transmitter.
The requirements are strict, which requires that the accuracy of the process conditions is relatively high, and the instrument with a very suitable range should be selected strictly according to the process conditions.
After the instrument is selected, its installation is also a very important link. Fuji absolute pressure transmitters are mostly used to measure the gas phase pressure of the process medium, so the FKH transmitter should be higher than the pressure guiding pipe, and most of the mounting brackets are used to fix the process pipeline or equipment, and it is easy to operate on the platform.For some reasons, during construction, the installation of absolute pressure transmitters often does not attract attention.
In this case, it is difficult for the pressure guiding pipe to be threadedly connected to the instrument. Even if a high temperature sealant is wrapped around the connection between the pressure guiding pipe and the thread, the leakage cannot be prevented. In order to facilitate the maintenance of the instrument, the instrument cannot be welded.
on the pressure pipe. If there is leakage, it is impossible for the absolute pressure transmitter to truly measure the absolute pressure of the production process, so there will be a result of a large reading error.
This has a particularly pronounced effect on the regulation control loop.
When the transmitter and the pressure guiding pipe are not closely connected and there is leakage, the measurement data is not the absolute pressure of the production process, so when the process pressure changes, the transmitter measurement results have no corresponding changes or inconsistent changes. The PID function block also loses the function of auto-tuning.
Therefore, the installation position of the transmitter must be accurately positioned during the installation of the absolute pressure transmitter.
When welding the pressure guiding tube, pay attention to whether it can be exactly on the same axis as the threaded interface of the transmitter, and according to the sealing requirements, wrap the high temperature sealing tape on the connection between the pressure guiding tube and the transmitter, the mark "1" in Figure 1 is the It is the threaded connection between the pressure guiding tube and the transmitter. Before installing the absolute pressure transmitter, it is also essential to check the range and unit of the instrument.
The following is the selection table of Fuji absolute pressure transmitter for customers to choose according to this information.
