For many OEM devices with a short distance between the transmitter and the controller, the mA output transmitter is the most economical and effective solution. If the output signal needs to be amplified, it is best to use the transmitter with built-in amplification. For long-distance transmission or the presence of strong electronic interference signals, it is best to use mA-level output or frequency output.
1. What pressure should the transmitter measure?
First determine the maximum value of the measured pressure in the system. Generally speaking, you need to select a transmitter with a pressure range that is about 1.5 times greater than the maximum value. This is mainly in many systems, especially in water pressure measurement and processing, there are peaks and continuous irregular up and down fluctuations, this instantaneous peak can destroy the pressure sensor, sustained high pressure value or slightly exceed the transmitter Calibrating the maximum value will shorten the life of the sensor, however, the accuracy will decrease due to this. Therefore, a buffer can be used to reduce the pressure glitch, but this will reduce the response speed of the sensor. Therefore, when selecting the transmitter, the pressure range, accuracy and stability must be fully considered.
2. What kind of pressure medium
Viscous liquids and slurries will plug the pressure interface, and solvents or corrosive substances will not damage the materials that Luzhong sends directly to these media. These factors will determine whether to choose a direct isolation film and materials that are in direct contact with the medium.
3. How much accuracy the transmitter needs
The accuracy is determined by nonlinearity, hysteresis, non-repeatability, temperature, zero offset scale, and the influence of temperature. But mainly by non-linearity, hysteresis, non-repeatability, the higher the accuracy, the higher the price.
4. The temperature range of the transmitter
Usually a transmitter will calibrate two temperature ranges, namely the temperature range for normal operation and the temperature compensation range.
The normal operating temperature range refers to the temperature range when the transmitter is not damaged in the working state. When the temperature compensation range is exceeded, the performance index of its application may not be reached.
The temperature compensation range is a typical range that is smaller than the operating temperature range. Working within this range, the transmitter will surely meet its due performance indicators. The temperature change affects its output from two aspects, one is zero drift; the other is the full-scale output. For example: +/- X% / ℃ of full scale, +/- X% / ℃ of reading, +/- X% of full scale when temperature range is exceeded, +/- X% of reading when temperature compensation range Without these parameters, it will lead to uncertainty in use. Is the change of the transmitter output caused by pressure change or temperature change? The effect of temperature is the most complicated part of understanding how to use the transmitter.
5. What kind of output signal do you need?
mV, V, mA and frequency output digital output, the choice of output depends on many factors, including the distance between the transmitter and the system controller or display, whether there is noise or other electronic interference signals. Do you need an amplifier, the position of the amplifier, etc. For many OEM devices with a short distance between the transmitter and the controller, the mA output transmitter is the most economical and effective solution. If you need to amplify the output signal, it is best to use a transmitter with built-in amplification. For long-distance transmission or the presence of strong electronic interference signals, it is best to use mA-level output or frequency output. If you are in an environment with high RFI or EMI specifications, in addition to paying attention to the choice of mA or frequency output, you must also consider special protection or filters.
6. What excitation voltage to choose
The type of output signal determines what excitation voltage is selected. Many amplifying transmitters have built-in voltage regulators, so their power supply voltage range is large. Some senders are quantitatively configured and require a stable working voltage. Therefore, the available working voltage determines whether or not to use a sensor with a regulator. When selecting a transmitter, the working voltage and system cost should be taken into consideration.
7. Do you need an interchangeable transmitter?
Determine whether the required transmitter can adapt to multiple use systems. In general, this is important. Especially for OEM products. Once the product is delivered to the customer, the cost of calibration used by the customer is considerable. If the product has good interchangeability, even if the transmitter used is changed, no one will affect the effect of the entire system.
8. The transmitter needs to maintain stability after overtime work:
Most transmitters will drift after overtime work, so it is necessary to understand the stability of the transmitter before buying. This kind of advance work can reduce all kinds of troubles that will occur in future use.
9. Packaging of the transmitter
The package of the transmitter is often easily overlooked by its frame, but this will gradually expose its shortcomings in future use. When purchasing a transmitter, you must consider the future working environment of the transmitter, how the humidity is, how to install the transmitter, and whether there will be strong impact or vibration.
10. What kind of connection is used between the transmitter and other electronic equipment:
Do I need to use a short distance connection? If a long-distance connection is used, is a connector required?
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