Talking about the precautions for the use of pressure sensors

The main points during the use of the pressure sensor and the correct installation position of the transmitter on the process pipeline are related to the measured medium. For the best measurement results, the following conditions should be considered:

1. Prevent the transmitter from contacting with corrosive or overheated media;

2. Prevent dross from depositing in the conduit;

3. When measuring the liquid pressure, the pressure port should be opened on the side of the process pipe to avoid precipitation and slag.

4. When measuring gas pressure, the pressure port should be opened at the top of the process pipeline, and the transmitter should also be installed at the top of the process pipeline so that the accumulated liquid can be easily injected into the process pipeline.

5. The pressure guiding pipe should be installed in a place with small temperature fluctuation;

6. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected, and the operating temperature of the transmitter should not exceed the limit.

7. When freezing occurs in winter, anti-freezing measures must be taken according to the transmitter installed outdoors to avoid the expansion of the liquid in the pressure port due to the frozen volume and lead to damage to the sensor.

8. When measuring the liquid pressure, the installation position of the transmitter should avoid the impact of the liquid (water hammer phenomenon) to avoid the sensor from being damaged by overpressure.

9. When wiring, pass the cable through the waterproof connector (accessory) or the flexible tube and tighten the sealing nut to prevent rain and other leakage through the cable into the transmitter housing.

The function of the pressure transmitter is to transform the controlled quantity measured by the measuring element into the signal type required by the controller.

The difference between a pressure transmitter and a differential pressure transmitter: the pressure differential transmitter is for gas or liquid. The pressure unit is Pascal; the pressure transmitter generally refers to the pressure of the gas liquid, but there is also a pressure sensor for pressure. The unit is Newton or kilogram (force) or ton. The differential pressure transmitter measures the pressure difference between two (inside the container) gas or liquid is a relative quantity; the pressure transmitter measures the pressure of a single (inside the container) gas or liquid, which is an absolute quantity. From the point of view of the use, the pressure difference has two input nozzles for introducing two samples to be measured to obtain their pressure difference; the pressure is only one nozzle.

Maintenance of pressure transmitter: The pressure transmitter is required to be inspected once a month and once a week, mainly to remove the dust in the instrument, to check the electrical components carefully, to check the output current value frequently, the pressure changes The inside of the transmitter is weak, and it must be separated from the strong outside.

Regarding the service life of pressure transmitters, suppliers now provide life guarantees for high-end, high-performance transmitters, but in fact it is only a matter of time before these guarantees are extended to low-end products. In the not-too-distant future, the advanced technology that only high-performance transmitters have today will be widely used in low-end transmitters, and then a clear life guarantee will be common.

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