First, Tiankang pressure transmitter selection:
1, the transmitter needs to measure what kind of pressure: first determine the need to confirm the maximum value of the measurement pressure in the system, in general, you need to select a transmitter with a pressure range greater than the maximum value of about 1.5 times. . When choosing a transmitter, consider the pressure range, accuracy, and stability.
2, what is the specific pressure medium: we have to consider is the pressure transmitter to measure the medium, adhesive liquid, mud will plug the pressure interface, solvent or corrosive material will not damage the transmitter .
3. How much precision the transmitter needs: The accuracy is generally 0.5%.
4, the transmitter temperature range is usually: a transmitter will be calibrated with two temperature ranges, the normal operating temperature range and temperature compensation range. The normal operation temperature range refers to the temperature range when the transmitter is not destroyed in the working state. When the temperature compensation range is exceeded, the application performance index may not be reached.
5. What kind of output signal needs to be obtained: mV, V, mA and frequency output digital output.
6. Is it necessary to have interchangeable transmitters: Determine if the required transmitter is capable of accommodating multiple use systems.
7, the transmitter needs to maintain stability after overtime work.
8, the transmitter's packaging: The transmitter's package, especially often overlooked is its rack, but this will gradually expose its shortcomings in the future use. The transmission of the optional transmitter must take into consideration the working environment of the transmitter, the humidity, and how to install the transmitter. Will there be strong impact or vibration.
9. Others, after confirming some of the above parameters, we must also confirm the process connection interface of your pressure transmitter and the supply voltage of the pressure transmitter; if you use it under special circumstances, you must also consider the explosion protection and protection class.
Second, installation precautions:
Before installing and using the pressure transmitter, you should read the product catalog and the operating instructions carefully. The pressure interface must not be leaked during the installation to ensure that the range and wiring are correct. The pressure sensor and the shell of the transmitter are generally required to be grounded. The signal cable must not be mixed with the power cable. Strong electromagnetic interference should be avoided around the sensor and the transmitter.
1. Before the installation, it is necessary to carefully read the product copy sheet, accurately connect the wiring, and pay attention to the fact that the product cannot be wired incorrectly.
2, the transmitter should be installed in the ventilation, dry, no corrosion, cool and less temperature changes. If it is installed in the open air, a protective cover should be added to avoid direct sunshine and rain, so as to prevent the product function from being lowered or malfunctioning.
3. It is forbidden to beat, impact, disassemble, forcefully clamp or press the hole or metal diaphragm with sharp tools.
4, pay attention to protect the product to lead the cable, cable connector must be sealed at the junction to avoid water or moisture affect the machine function and life, post-transmission terminal leads need to ensure good conduction and atmospheric conduction.
5. When installing, a pressure cut-off valve should be installed between the transmitter and the medium in order to check and prevent the clogging of the pressure-reducing port and affect the measurement accuracy. Pressure-buffering devices should also be installed in places where the pressure fluctuation range is large.
6. When measuring steam or other high-temperature medium, pay attention not to exceed the working temperature of the transmitter. If necessary, connect the pressure piping or other cooling device.
7. When measuring the liquid medium, be sure to use the stop valve to drain the air in the pipeline before pressurizing to prevent the overload of the high pressure conductivity sensor due to compressed air.
8. Super-indicated overload is forbidden. Sensitive membrane damage caused by over-index overload is not within the scope of the Three Guarantees.
9. When the explosion-proof transmitter is used in a dangerous place, the cover of the transmitter must be tightened. To ensure the safety of use, we should strictly observe the safety regulations and absolutely not allow the transmitter cover to open when the power is turned on.
10. Intrinsically safe transmitters must be equipped with safety barriers for use in hazardous locations with explosive mixtures. The safety barrier shall be in accordance with GB3836.4-2000 “Intrinsic safety type of electrical installations for explosive gas atmospheresâ€. The explosion-proof test shall be carried out on the relevant explosion-proof parts and an explosion-proof certificate shall be obtained.
Third, the wiring: generally 2-wire instrument, 4 ~ 20mA signal, if you do not need to connect remotely 24V voltage +, -, if you need to pass remotely, then you need to form a loop, such as 24V + pressure gauge +, pressure gauge - 4 ~ 20mA+, 4~20mA - connect 24V - it's OK.
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