Choose a good location for Melt Pressure Sensor

Transducers can be placed inside the barrel, before a sieve changer, before and after a melt pressure sensor pump, or inside the mold. When a transducer is positioned upstreamly above the barrel, undissolved pellets can erode the transducer tip, causing damage. If a transducer is placed too far from the mounting hole, a stagnant molten plastic pool is formed between the transducer tip and screw flights. Over time, this plastic will deteriorate into carbon, which will prevent the transmission of a correct pressure signal. On the other hand, if the transducer gets too long on the barrel, screw flights can cut off the sensor tip.

 

Check hole thread size

 

Screwing the transducer into a mounting hole with the wrong thread size will damage the threads of the device. This can prevent a tight seal causing the melt pressure sensor leak and the device will not work properly or safely. The correct dimensions must be used for the mounting hole to prevent threading. (Teeth are usually 1 / 2-20 UNF 2B industry standard.) A mounting well indicator plug should be used to verify that the mounting hole has been handled and cleaned properly.