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Cavity pressure sensors – for more control and efficiency

According to the motto ‘everything from one source’, Meusburger now also offers sensors for cavity pressure measurement, in addition to standard parts for temperature and end position control. These are compatible with all piezoelectric pressure sensors as well as their components currently available on the market.

Components

The range includes two types each for direct and indirect measurement as well as suitable mounting accessories and connection technology - as usual available from stock with simple CAD data download - including installation spaces - from the Meusburger web shop.

Senzor de presiune al cavității matriței

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

Functional principle and uses of cavity pressure sensors

Cavity pressure sensors make it possible to convert the pressure in the cavity to a measurable charge by means of the piezoelectric effect. The sensors are equipped with high-precision quartz crystals (SiO2 or α-quartz) which release a charge under the influence of pressure or force. This charge, amplified by a charge amplifier, provides precise information about the pressure applied to the sensor and makes it possible to monitor the exact cavity pressure in the injection moulding process. The ideal installation position in the mould depends on the application. For example, for general monitoring and process optimisation, the sensor is placed as close as possible to the sprue or on a thicker section of the moulded part. Other typical applications are strength monitoring and monitoring or controlling viscosity, compression or shrinkage.

Direct and indirect cavity pressure sensors

Depending on the application, there are two types of pressure sensors: direct and indirect sensors, which serve for direct or indirect pressure measurement.

Meusburger E 6740 Cavity pressure sensor for direct measurement

For direct measurement, the pressure sensor is inserted directly into the cavity so the cavity pressure can be measured directly in the respective area. When pressure is applied, the sensor delivers an electrical charge in the pC unit (Picocoulomb), which is then converted into a change of pressure (bar) through the specified sensor sensitivity (pC/bar).

To the product

Meusburger E 6750 Cavity pressure sensor for indirect measurement

The indirect measurement of the cavity pressure is carried out via a force sensor which is located outside the cavity and is indirectly actuated by a force. Unlike direct sensors, the cavity pressure is transmitted to the sensor as a force via an ejector pin. In response to this force, the sensor emits an electrical charge, which is then converted into a change of force (N) through the specified sensor sensitivity (pC/N). This change of force combined with the surface of the ejector is used to calculate the pressure change.

To the product

Single Wire vs. Coaxial

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.

E 6760 Single wire

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.

E 6757 Mini coaxial

Comparison of the two versions available at Meusburger for multi-channel connectors

 Single wire
E 6760
Mini coaxial
E 6757
SignalCan be disturbed by signals from the environment (noise) if the shielding is insufficientNo signal interference thanks to shielding against environmental influences through steel sheath
Cable lengthAvailable in lengths 2,000 and 5,000; cables can easily cut to length as requiredAvailable in consecutive lengths from 200 to 1,000 mm; can only be cut to length with a special tool
Cable diameter1.2 mm1.9 mm
FlexibilityVery flexible due to minimal bending radii but risk of kinkingLess flexible than single wire cable, but resistant to kinking
InstallationEasy to install thanks to the insulation displacement connector on the multi-channel connectorEasy to install thanks to mini coax female connector on the multi-channel connector
PriceLower than for mini coaxialHigher than for single wire

 

 

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.

E 6763 Multi-channel connector

Connection options

The different connection options for direct and indirect cavity pressure sensors are shown in the following figures.

Cavity pressure sensor connection options – direct

Cavity pressure sensor connection options – indirect

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