Matters needing attention in the use of pressure sensor and transmitter and

Pressure sensors and transmitters are prone to the following faults:

If the pressure goes up, the transmitter can't get on. In this case, first check whether the pressure interface leaks or is blocked. If it is not, check the wiring mode and the power supply. If the power supply is normal, simply pressurize it to see if the output changes, or check whether the zero position of the sensor has output. If there is no change, the sensor is damaged, which may be a problem of instrument damage or other links of the whole system.

The second is that the output of the pressurization transmitter does not change, and then the output of the pressurization transmitter suddenly changes, so that the zero position of the pressure relief transmitter cannot be returned, which is probably the problem of the pressure sensor sealing ring. It is common that due to the specifications of the sealing ring, after the sensor is tightened, the sealing ring is compressed into the pressure inlet of the sensor to block the sensor, and the pressure medium can't get in when it is pressurized, but when the pressure is high, the sealing ring suddenly bursts open, and the pressure sensor changes under pressure. The best way to eliminate this fault is to remove the sensor and directly check whether the zero position is normal. If the zero position is normal, replace the sealing ring and try again.

The third is that the output signal of the transmitter is unstable. This kind of fault may be the problem of pressure source. The pressure source itself is an unstable pressure, which is probably due to the weak anti-interference ability of the instrument or pressure sensor, the strong vibration of the sensor itself and the sensor failure; The fourth is that the contrast deviation between transmitter and pointer pressure gauge is large. Deviation is normal, just confirm the normal deviation range;

The latter fault of zui is the influence of the installation position of micro differential pressure transmitter on the zero output. Because of its small measuring range, the sensing elements in the micro differential pressure transmitter will affect the output of the micro differential pressure transmitter. During installation, the pressure sensitive part of the transmitter should be axially perpendicular to the direction of gravity, and the zero position of the transmitter should be adjusted to the standard value after installation and fixation.

Matters needing attention and maintenance of pressure sensor and transmitter in use

1. Matters needing attention in use. The correct installation position of the transmitter on the process pipeline is related to the measured medium. In order to obtain a good measurement result of zui, several points should be paid attention to. * Point is to prevent the transmitter from contacting with corrosive or overheated media; The second point is that when measuring liquid pressure, the pressure tap should be opened on the side of the process pipeline to avoid sediment and slag accumulation; The third point is to prevent dregs from depositing in the conduit; The fourth point is that when measuring gas pressure, the pressure tap should be opened at the top of the process pipeline, and the transmitter should also be installed on the upper part of the process pipeline, so that the accumulated liquid can be easily injected into the process pipeline; The fifth point is that when measuring steam or other high-temperature media, it is necessary to connect a condenser such as a buffer tube (coil), so that the working temperature of the transmitter should not exceed the limit; The sixth point is that the pressure guide pipe should be installed in a place with small temperature fluctuation; The seventh point is that when freezing occurs in winter, anti-freezing measures must be taken according to the transmitter installed outdoors to avoid the liquid in the pressure-inducing port from expanding due to the freezing volume, which leads to the damage of the sensor; The eighth point is that when wiring, pass the cable through the waterproof joint or winding pipe and tighten the sealing nut to prevent rainwater from leaking into the transmitter shell through the cable; The ninth point is that when measuring the pressure of liquid, the installation position of the transmitter should avoid the impact of liquid, so as to avoid the sensor from being damaged by overpressure.

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

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