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Meusburger Cavity pressure sensors: single wire vs. coaxial

| Editor: Steffen Donath

The cavity pressure is an important parameter in process monitoring during plastic injection moulding.

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Mini coaxial and single wire cable with multi-channel connector
Mini coaxial and single wire cable with multi-channel connector
(Source: Meusburger)

Pressure sensors are therefore indispensable for comprehensive mould monitoring. The use of high-quality piezoelectric sensors leads to optimal process quality and increases part quality sustainably. Two different technologies are available on the market for charge transfer: single wire and coaxial cables.

Single wire

The single wire cable has a very small diameter. This means it can be routed flexibly with minimal bending radii in cable slots and holes and shortened as required. These cables are therefore ideally suited for moulds with limited space. In single wire technology, the mould provides shielding from the surrounding environment such as other voltage sources.

Coaxial

The coaxial cable is characterised by optimal shielding against external signals thanks to its steel sheath. The use of cavity pressure sensors with a coaxial cable is therefore ideally suited for moulds with a high number of electrical components, such as hot runner components or monitoring equipment. This variant is also used if the cable is routed outside of the mould. With the mini coaxial version, several sensor signals can be combined on one multi-channel connector.

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Multi-channel connector

With the E 6763 multi-channel connector, the signals from 4 to 8 cavity pressure sensors can be combined with minimum cabling effort. Depending on the version, the multi-channel connectors have insulation displacement contacts for the single wire cable (version S) and mini coax female connectors for the mini coaxial cable (version C). The mould recognition is done by a chip integrated on the circuit board and enables high process reliability during mould changes. In addition, the sensor data can be easily identified with the supplied labelling plate.

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