1. It is necessary for the sensor to be properly installed
Damage to high-temperature pressure sensors is usually caused by their installation in improperly machined holes. When a sensor is loaded into a hole that is too small or has a migraine, it may damage the sensor diaphragm and cause the instrument to not function properly.
The package of things that can be used to machine the holes of the device will help to ensure that the holes are properly scaled. Unit torque of 100 to 200 inch-pounds is critical to creating a satisfactory seal. However, excessive torque can cause seizure. To prevent seizure, a high-temperature anti-seizure compound should be applied to the sensor threads prior to installation. Even with anti-sticking agents, sensors with device torques of more than 500 in-lbs will be difficult to disassemble.
2. Ensure that the thread scale is correct
Screwing a high-temperature pressure sensor into an incorrectly sized device hole can cause wear and tear and then damage to the instrument's threads. This damage may result in poor seals and data leakage, and the instrument will not function properly or safely. It is necessary to use a suitable size of the device hole to avoid thread wear. Please ensure that the device holes are machined and cleaned correctly.
3. It is necessary to clean the device hole
It is important to keep the device holes of the sensor clean and free of any plastic build-up. Before cleaning the extruder, all sensors should be removed from the barrel to avoid damaging them. When they are removed, the plastic is likely to flow into the device hole and harden. If this hard plastic residue is not removed, it can lead to top-level damage when the sensor is inserted from the beginning. Contaminated plastic can be removed with a clean-up kit.
4. Choose a good orientation
High-temperature pressure sensors can be located in the barrel, before the screen changer, before and after the melt pump, or in the mold. When the sensor is placed too far upstream of the barrel, the unmelted plastic particles can wear down to the top of the sensor and cause damage. If the sensor is positioned too far back in the device hole, plugged molten plastic can accumulate between the top of the sensor and the screw threads. As the clock passes, this plastic will degrade into carbon, which will thwart the transmission of a precise pressure signal. On the other hand, if the sensor goes too far into the barrel, the screw thread will cut the top of the sensor.
5. Be careful to clean the sensor
All sensors should be removed before cleaning the extruder barrel with a wire brush or a special detergent. Any of these can damage the sensor diaphragm. When the barrel becomes hot, remove the sensor and scrub the tip clean with a non-abrasive cloth. At this point, the sensor hole should be cleaned with a clean drill/guide sleeve.
6. Prevent cold starts
If the extruder is not raised to operating temperature before the machine starts, both the sensor and the extruder may be damaged. It is necessary to provide a satisfying "warm-up moment" to change the plastic from a solid state to a molten state. It should also be noted that if the sensor is removed from the cold extruder, the data may adhere to the tip of the sensor, causing the sensor barrier to be torn off. Before removing the sensor, make sure that the barrel has a sufficient temperature to soften any plastic present.
7. Do not over-pressurize the sensor
Even if the high-temperature pressure sensor is designed to accept 1.5 times the overpressure, the risk of applying too much pressure should be prevented by ensuring that the extruder pressure scale used is correct.
A good rule of thumb is that the sensor used should be able to withstand twice the pressure required for the environment in which it will be used. This means that the extruder has to operate at extremely high (and unsafe) pressures before the sensor can be damaged.
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