Melt pressure in front of the screw of injection molding machines is an important process parameter. Machine control is critically dependent on its precise measurement. This is because injection molding components can only be kept within extremely tight tolerances if this pressure can be accurately and repeatably measured and recorded over an extended period of time.
The new melt pressure sensor Type 4021A… from Kistler is based on the piezoresistive principle of measurement. It measures the important machine parameter directly in the area in front of the screw with reproducibility errors of <0,1 %, a linearity error of <0,5 % and a zero point change of <0,5 %.
The sensor with a flat seal is supplied as a complete measuring chain with a new amplifier that also has an output for the melt temperature. The new melt pressure measuring chain is available for measuring ranges of 0 … 100, 0 … 500, 0 … 1 000,0 … 2 000 and 0 … 3 000 bar, and can be used at temperatures of up to 350 °C. Angled or straight cable exits and a connector version allow it to be used on machines presenting a wide variety of mounting situations.
Filed Under: Sensors (position + other), Sensors (pressure), Test + measurement • test equipment