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Intelligent differential pressure transmitter anti-interference problem
Nov 01, 2018

1. Intelligent differential pressure transmitter needs to maintain stability after working over time: Most transmitters will “drift” after overtime work, so it is necessary to understand the stability of the transmitter before purchasing. The work can reduce the troubles that will arise in future use.

2. Packaging of constant pressure water supply pressure transmitter The package of the transmitter is especially easy to ignore because it is a rack. However, this will gradually expose its shortcomings in later use. In the purchase of the transmitter must take into account the working environment of the pressure transmitter in the future, how the humidity, how to install the transmitter, there will be strong impact or vibration.

3. What kind of connection is used between the intelligent differential pressure transmitter and other electronic devices. Is it necessary to use a short-distance connection? If a long-distance connection is used, is it necessary to use a connector?

4. Select what output signal. What output signals are required for the pressure transmitter: mV, V, mA, and frequency output digital output, depending on various factors, including the distance between the transmitter and the system controller or display, whether there is “noise” or other electronics Interference signal. Whether the amplifier, the position of the amplifier, etc. are required. For many transmitter OEM devices with short distances between transmitter and controller, the most economical and effective solution for transmitters with mA output. If you need to amplify the output signal, it is best to use a transmitter with built-in amplification. Device. For long-distance transmission or strong electrical interference signals, it is best to use mA output or frequency output. In environments where RFI or EMI specifications are high, in addition to the need to select mA or frequency output, special protection or filters are also considered. (At present, due to the needs of various acquisitions, there are many kinds of output signals of pressure transmitters on the market, mainly 4-20mA, 0-20mA, 0-10V, 0-5V, etc., but the more commonly used is 4- 20mA and 0-10V. Among the output signals I mentioned above, only 2-20mA is two-wire system. The output we say is that the wire system does not contain grounding or shielding wires, and the others are all three-wire system. 

5. Select the excitation voltage. The type of output signal determines how the excitation voltage is selected. Many amplifiers have built-in voltage regulators, so their supply voltage range is large. Some transmitters are quantitatively configured and require a stable operating voltage. Therefore, one operating voltage that can be obtained determines whether or not to use a sensor with a regulator. When selecting a transmitter, consider the operating voltage and system cost.

6. Whether an interchangeable transmitter is required. Determine if the required transmitter can accommodate multiple operating systems. Generally speaking, this is very 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.

7. 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 it is used in special occasions, the explosion protection and protection level should also be considered.