1. What is Fuji Flange transmitter?
Fuji flange transmitter is based on the ordinary transmitter by adding a remote transmission seal device. So also called remote transmitter or diaphragm transmitter. The remote sealing device is composed of a flange, a membrane box, a capillary and a filling liquid in the capillary. Process medium pressure from the diaphragm, filling liquid finally transferred to the pressure transmitter sensor.
2. What is the filling liquid in the membrane box and capillary of Fuji Flange transmitter? What are the characteristics?
Usually silicone oil and fluorine oil. It is characterized by small thermal temperature coefficient, no freezing at low temperature, no volatilization at high temperature, no vaporization. Viscosity does not vary greatly with temperature. High temperature silicone oil can be up to 315℃, low temperature silicone oil can be up to -40℃, fluorine oil between -40℃ and 315℃.
3. What are the advantages of Fuji flange transmitter compared with Fuji common transmitter?
Medium at higher temperatures can be measured.
It will not clog and should be on a viscous medium.
It can be applied to the medium which is easy to freeze or vaporize.
Slightly higher cost, complex structure, sometimes time delay, slightly less precision.
4. Fuji common pressure transmitter is composed of what parts?
The ordinary pressure transmitter is composed of a sensor, a transmission circuit, a shell, a liquid port, a wiring port and so on. At present, the sensors have diffused silicon, piezoelectric ceramics, capacitance membrane box. Their measurement principle is invariably the current or voltage output when the excited Wheatstone bridge is out of balance. The converter circuit converts the output signal into a linear relationship corresponding to the measured physical quantity.
The liquid connector directly contacts with the process medium and has a variety of connection modes. Such as: 1/2 NPT, G3/4, M20*1.5, etc. A terminal is a wire inlet, such as M20*1.5. It requires a certain level of protection. For example, IP65.
5. When measuring high pressure, the maximum working pressure of the medium should not exceed 3/5 of the instrument range.
6. What are the main technical parameters of Fuji pressure transmitter?
Sensor type: diffused silicon, ceramic capacitor, differential capacitance membrane box power supply: generally 24VDC.
Output signal: Generally 4~20mA. Accuracy class: 0.1, 0.25, 0.5. Repeatability: 0.1, 0.25, 0.5. Time drift: Temperature drift: operating temperature range: maximum voltage: minimum pressure: process Connection mode: cable entry: Installation mode:
7. What is migration?
It is generally believed that the adjustment of zero input which does not take zero pressure or zero differential pressure as transmitter is called transfer.
8. What is two-line system?
The 24VDC power supply and the 4 to 20mA output signal share two wires, which do not affect each other.
9. What are the advantages of current transmission over voltage transmission?
Long transmission distance, constant current characteristic within a certain range, small current loss.
10. What is the outside diameter and length of the pressure guide?
The outer diameter of the pressure guide tube is generally 6~10mm; The length is usually 3~50m.
11. Hydrostatic level gauge is based on the hydrostatic pressure balance principle and work, it can be divided into pressure type and differential pressure type two categories.
12. When measuring the liquid level with the pressure gauge, the height of the instrument installation should be said to be the same as the height of the zero level, otherwise the height difference should be corrected.
13. What are the functions of the manual operator?
Configuration: Set the working parameters of the transmitter. Such as measuring range, linear or square root output, damping, engineering unit, station number, series number, descriptor. Change of measuring range, that is, range migration. Transmitter calibration: current calibration and variable calibration.
Self-diagnosis: The transmitter outputs specific information to the operator to identify the problem so that repairs can be made quickly.
14. There are the following kinds of hand-operated devices in the application site:
Rosemount --475, TREX; Yokogawa --BT200; Fujifilm Corporation --FXW;
15. What should I pay attention to when operating the three-valve group?
Do not allow condensate or isolation fluid to drain from the pressure guide tube. The measuring element (cartridge) shall not be subjected to pressure or heat.
16. What is the sequence of opening and closing three-valve sets?
Opening sequence: open the positive valve first; Close the balance valve; Open the negative pressure valve. Closing sequence: close the negative pressure valve first; Open the balance valve; Close the positive valve.
17. How about the opening position of the suction port of the gas, liquid and steam time difference pressure transmitter?
When measuring the gas, in order to make a small amount of condensate in the gas can smoothly flow back to the process pipe, but not flow
Into the measuring pipe and instrument, the pressure opening should be in the upper part of the pipe.
When measuring the liquid, in order to let the small amount of gas precipitated in the liquid can be smoothly returned to the process pipe, rather than
When entering the measuring pipe and instrument, the pressure opening should be at an Angle of 0-45 degrees below the horizontal center line of the pipe.
When measuring the steam medium, the stable condensate in the measuring line should be maintained, while also preventing the process pipe
The solid medium at the bottom of the channel enters the measuring pipe and instrument, and the pressure opening should be at an Angle of 0-45 degrees above the horizontal center line of the pipe.
18. Fuji double flange differential pressure transmitter measuring differential pressure or liquid level if the diaphragm works under negative pressure state what harm?
If the Fuji transmitter works in a negative pressure state, and exceeds its allowable negative pressure value, the filling liquid in the membrane box will vaporize, the isolation diaphragm will be outside the drum, resulting in inaccurate measurement, and even damage to the instrument.
19. Why is the accuracy of Fuji flange transmitter lower than that of ordinary transmitters?
Elastic Force and nonlinearity of flanged diaphragm. Thermal expansion of the filling solution. Damping of capillaries. Filling quality of filling solution.
20. When was the smart transmitter introduced? What are its characteristics?
In the early 1980s, the United States Honeywell first launched ST3000 series intelligent pressure transmitter. The features of the intelligent transmitter are
In addition to the pressure (differential pressure) sensing element, there are generally temperature sensing elements in the detection components.
The products adopt microelectronic mechanical electronic processing technology, super large scale integrated circuit, surface mounting technology, all the instruments compact structure, high reliability, small size.
High accuracy, generally in 0.1%, 0.2%0 and some also reach 0.75%. The range ratio is wide, and some reach 30, 40, 50, 100, or even 400.
Static pressure performance and unidirectional overload performance are greatly improved compared with analog products. The intelligent transmitter can be used for remote communication with a manual operator. Set zero and full degree for it. That means you can do passive migration. Field application is very convenient.
Intelligent transmitter and distributed control system DCS can be digital communication.
