1. What kind of pressure should be measured by the pressure transmitter? Firstly, determine the maximum value of the measured pressure in the system. Generally, it is necessary to select a transmitter with a pressure range that is about 1.5 times larger than the maximum value. This is mainly due to the fact that in many systems, especially water pressure measurement and processing, there are peaks and constant irregular up and down fluctuations, which can damage the pressure sensor. A sustained high pressure value or slightly exceeding the transmitter's calibrated maximum will shorten the life of the sensor, which will also reduce accuracy. A buffer can then be used to reduce the pressure glitch, but this will reduce the sensor's response speed. Therefore, the pressure range, accuracy and stability should be fully considered when selecting the transmitter. Professional Plastic Screw Cover manufacturer is located in China, including Plastic Bottle Cover,Round Plastic Caps,Black Plastic End Caps, etc.SAFE and HEALTHY: These lids are made high quality Plastic and BPA free. Completely safe and healthy. Plastic Screw Cover,Plastic Bottle Cover,Round Plastic Caps,Black Plastic End Caps NINGBO SUNWINJER DAILY PRODUCTS CO.,LTD , https://www.nblux-pack.com
2. What kind of pressure medium viscous liquid, mud will block the pressure interface, solvent or corrosive substances will not damage the material in the transmitter that is in direct contact with these media. These factors will determine whether to choose a direct barrier and a material that is in direct contact with the media.
3. How much accuracy does the pressure transmitter need to determine the accuracy, nonlinearity, hysteresis, non-repetition, temperature, zero offset scale, and temperature effects. But mainly by nonlinearity, hysteresis, non-repetition, the higher the accuracy, the higher the price.
4, the temperature range of the transmitter usually a transmitter will calibrate two temperature segments, one of which is the normal operating temperature, the other is the temperature compensation range, the normal operating temperature range refers to the transmitter under working conditions The temperature range at the time of non-destruction may not reach the performance specifications of the application when the temperature compensation range is exceeded.
The temperature compensation range is a typical range that is smaller than the operating temperature range. In this range, the working transmitter will definitely meet its performance specifications. Temperature changes affect its output in two ways, one is zero drift, and the other is the full-scale output. For example: /X%/°C of full scale, /X%/°C of reading, /X% of full scale over temperature range, /X% of reading within temperature compensation range, if not The parameters will lead to uncertainty in use. The change in the output of the transmitter is caused by a change in pressure or by a change in temperature. Temperature effects are the most complex part of understanding how to use the transmitter.
5. What kind of output signal is needed?
mV, V, mA and frequency output digital output, the choice of output depends on a variety of factors, including the distance between the transmitter and the system controller or display, whether there is "noise" or other electronic interference signals, whether an amplifier is needed, The position of the amplifier, etc. The most economical and effective solution for transmitters with mA output for many OEM devices with short distances between transmitter and controller.
If you need to amplify the output signal, use a transmitter with built-in amplification. For long-distance transmission or strong electronic interference signals, mA-level output or frequency output is used.
In the environment with high RFI or EMI specifications, besides the need to note the choice of mA or frequency output, special protection or filters should be considered.
6. Select the type of excitation voltage output signal to determine what excitation voltage to select. Many transmitters have built-in voltage regulation, so their supply voltage range is large. Some transmitters are quantitatively configured and require a stable operating voltage. Therefore, the operating voltage determines whether or not to use a sensor with a regulator. When selecting a transmitter, consider the operating voltage and system cost.
7. Whether an interchangeable transmitter is required to determine if the required transmitter can accommodate multiple operating systems. This is generally important, especially for OEM products. Once the product is delivered to the customer, the cost of the customer's calibration is considerable. If the product is interchangeable, even changing the transmitter used will not affect the overall system.
8. The transmitter needs to maintain stability after working overtime. Most of the transmitters will “drift†after over-work, so it is necessary to understand the stability of the transmitter before purchasing. This kind of pre-work can be reduced. There will be troubles in the future.
9. The package of the transmitter package of the transmitter is often easy to ignore is its frame, however this will gradually expose its shortcomings in the future. When purchasing the transmitter, you must consider the working environment of the transmitter in the future, how to humidity, how to install the transmitter, whether there will be strong impact or vibration.
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