Differential pressure transmitter six Steps
Differential Pressure Transmitters are transmitters that measure the difference in pressure across the transmitter and output standard signals (such as 4 to 20 mA, 0 to 5 V) to measure the level, density, and pressure of liquids, gases, and vapors. Wait. Today we mainly introduce the six operating steps of the differential pressure transmitter, hoping to help users better use the product.
1. Choose the right location: When the differential pressure transmitter is installed too close to the production line, the unmelted material will wear to the top of the sensor. If the sensor is installed too far behind, there will be a stagnant zone of molten material between the sensor and the screw stroke, where the molten material is likely to degrade, and the pressure signal may also be distorted. In general, the sensor can be located on the barrel in front of the screen, in front of the melt pump, or in the mold.
2, check the size of the mounting hole: If the size of the mounting hole is not suitable, the differential pressure transmitter during the installation process, the threaded part is more susceptible to a certain degree of wear. This will not only directly affect the sealing of the device, but also make the pressure sensor can not fully play its role, and may even have security risks. Only the appropriate mounting holes can avoid thread wear. Usually, we can use the mounting hole measuring instrument to perform detailed inspection on the mounting holes to make appropriate adjustments.
3, to avoid low-temperature interference: In the extrusion process, if the extruder has not reached the operating temperature before starting production, then the sensor and the extruder will be damaged to a certain extent. In addition, if the sensor is removed from the cold extruder, the material may adhere to the top of the sensor causing damage to the diaphragm. Therefore, before the differential pressure transmitter is removed, it should be confirmed that the temperature of the barrel is sufficiently high and the material inside the barrel is in a softened state.
Keep dry: Although the differential pressure transmitter circuit design can withstand harsh extrusion processing environment, but most of the sensors can not be absolutely waterproof, in a humid environment is not conducive to normal operation. Therefore, it is necessary to ensure that the water in the water cooling device of the barrel of the extruder does not leak, otherwise the sensor will be adversely affected. If the sensor has to be exposed to water or a humid environment, special sensors with extremely high water resistance must be selected.
5, to maintain the cleaning of the mounting hole: To maintain the cleaning of the mounting hole is mainly to prevent the clogging of the melt, for the normal operation of the equipment is extremely important. Before the extruder is cleaned, all pressure sensors should be removed from the barrel to avoid damage. When the sensor is removed, the molten material may flow into the mounting hole and harden. If these residual melts are not removed, the top of the sensor may be damaged when the sensor is installed again. The cleaning kit can remove these frit residues. However, the repeated cleaning process may deepen the damage caused by the mounting hole to the sensor. If this happens, steps should be taken to increase the position of the sensor in the mounting hole.
6. Careful and thorough cleaning: Before using a wire brush or special compound to clean the barrel of the extruder, all differential pressure transmitters should be removed. Because both of these cleaning methods may cause damage to the sensor's diaphragm. When the barrel is heated, the sensor should also be disassembled and wiped on top using a soft cloth that will not wear, and the holes in the sensor also need to be cleaned with a clean drill and guide bush.
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