Usage and maintenance of SMC pressure transmitter

Correct use

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

2. Prevent dregs from depositing in the conduit;

[14] When measuring liquid pressure, the pressure tap should be opened on the side of the process pipeline to avoid slag deposition;

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

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

[6] When measuring steam or other high-temperature media, it is necessary to connect a condenser such as a buffer tube (coil) to prevent the working temperature of the transmitter from exceeding the limit;

Once, when freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures to avoid the loss of sensors caused by the expansion of the liquid in the pressure tap due to freezing;

⒏ When measuring liquid pressure, the installation position of pressure transmitter should avoid the impact of liquid (water hammer phenomenon), so as to avoid overpressure damage of pressure transmitter;

Pet-name ruby wiring, the cable through the waterproof joint or winding tube and tighten the sealing nut, in case of rain water leakage into the transmitter shell through the cable.

Fold and edit daily maintenance of this section

1. Check the size of the mounting hole: If the size of the mounting hole is not appropriate, the threaded part of the sensor will be easily worn during installation. This will not only affect the sealing performance of the equipment, but also make the pressure sensor not fully play its role, and may even cause security risks. Only suitable mounting holes can avoid thread wear (thread industry standard 1/2-20 UNF 2B), and mounting holes can usually be detected by mounting hole measuring instrument to make appropriate adjustments. [1]

2. Keep the installation hole clean: It is very important to keep the installation hole clean and prevent the molten material from blocking to ensure the normal operation of the equipment. Before the extruder is cleaned, all pressure sensors should be removed from the barrel to avoid damage. When removing the sensor, the molten material may flow into the installation hole and harden. If these residual molten materials are not removed, the top of the sensor may be damaged when installing it again. The cleaning kit can remove these melt residues. However, the repeated cleaning process may deepen the damage to the sensor caused by the mounting hole. If this happens, measures should be taken to raise the position of the sensor in the mounting hole.

3. Choose the right position: When the installation position of the pressure sensor is too close to the upstream of the production line, the unmelted material may wear the top of the sensor; If the sensor is installed too far back, there may be a stagnant area of molten material between the sensor and the screw stroke, where the molten material may be degraded and the pressure signal may be distorted; If the sensor goes too deep into the barrel, the screw may touch the top of the sensor during rotation and cause its damage. Generally speaking, the sensor can be located on the barrel in front of the screen, before and after the melt pump or in the mold.

4. Clean carefully; Before cleaning the extruder barrel with wire brush or special compound, all sensors should be removed. Because these two cleaning methods may damage the diaphragm of the sensor. When the barrel is heated, the sensor should also be removed and the top of it should be wiped with a soft cloth that will not cause wear, and the hole of the sensor should also be cleaned with a clean drill and guide sleeve.

5. Keep it dry: Although the circuit design of the sensor can withstand the harsh extrusion processing environment, most sensors are not absolutely waterproof, which is not conducive to normal operation in a humid environment. Therefore, it is necessary to ensure that the water in the water cooling device of the extruder barrel will not leak, otherwise it will adversely affect the sensor. If the sensor has to be exposed to water or wet environment, it is necessary to choose a special sensor with strong water resistance.

6. Avoid low temperature interference: In the extrusion production process, there should be sufficient "soaking time" for plastic raw materials from solid to molten state. If the extruder has not reached the operating temperature before starting production, both the sensor and the extruder will be damaged to some extent. In addition, if the sensor is removed from the cold extruder, the material may adhere to the top of the sensor and cause damage to the vibrating membrane. Therefore, before removing the sensor, it should be confirmed that the temperature of the barrel is high enough and the materials inside the barrel are in a softened state.

7. Prevent pressure overload: Even if the overload design of the pressure sensor's pressure measuring range can reach 50% (beyond the ratio of the large range of zui), from the perspective of the safety of equipment operation, we should try our best to avoid taking risks. zui is good at choosing the sensor whose measured pressure is within the range. 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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