Kistler Measuring Chain Records Melt Pressure

The melt-pressure measuring chain from Kistler enables the precise measurement and recording of melt pressure when moulding components to tight dimensional tolerances. The chain is made up of a factory-calibrated sensor, matched amplifier and cable designed to measure and record the melt pressure in injection-moulding machines and hot-runner systems, and is also suitable for measuring static pressure in polymer pumps.

The sensor allows the melt pressure and temperature signals to be integrated into the moulding machine's control system. The very stable, high-temperature-resistant, piezoresistive measuring element is protected by a robust diaphragm, allowing the sensor to be mounted directly in the flow of the material to eliminate the time lag inherent in indirect measuring systems.

A temperature signal derived from the piezorestive element is used by the amplifier to compensate for temperature variations. The sensor displays high precision with repeatability errors of less than 0.1 per cent, linearity errors of less than 0.5 per cent and zero point change of less than 0.5 per cent.

Supplied as a complete measuring chain with a new digital amplifier that also has a melt-temperature output, the Type 4021A is available for pressures ranges up to 3,000 bar at a maximum operating temperature of 350C.

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Low-Pressure Gradient Professional IC Option

Metrohm's 850 Professional Anion MCS Low Pressure (LP) Gradient (2.850.2210) is suitable for new method development. The use of gradient chemistry (whereby the eluent strength is increased during the run) facilitates shorter retention times for late eluting peaks.

Metrohm believes that correct selection of the column and optimum mobile phase allows most separations in a routine environment to be solved isocratically. Any gradient separation also requires an additional equilibration step at the end of the separation, where the mobile phase is returned to its original (weaker) state. The 850 Professional IC Anion MCS LP Gradient can be operated with sequential, chemical or without suppression for complete flexibility.

The low-pressure gradient unit is suitable for method development as it can be used as an eluent selector for automatic switching between three different eluents so method development can be automatically performed overnight. The 850 Professional IC instruments feature Magic Net software for automatic recognition. It also provides complete system monitoring and ensures the control cards for calibration and samples are adhered to and documented in an FDA- and GLP-compliant form.

The software can easily produce reports. One-button IC allows novice operation. The 850 Professional IC?s Icolumns provide automatic recognition of the column. They will indicate optimal eluent, flow rate and the maximum pressure to safeguard the column. The Idetector provides digital signal processing with a 0 - 15000uS/cm single range. Metrohm claims the 850 Professional IC?s suppressor provides the lowest noise of any anion suppressor on the market, with full solvent compatibility and resistance to transition metals.

There is a ten year warranty on the suppressor and three years on the instrument hardware. Typical consumable costs for an automated instrument are GBP1000 a year.

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Kavlico Releases LPG And CNG Pressure Sensors

Kavlico has released a line of liquefied petroleum gas (LPG) and compressed natural gas (CNG) pressure sensors to support vehicles and industrial equipment using alternative fuels. These fuel options are being adopted by municipalities and other governmental agencies as an option for fleet vehicles such as cars, buses, trucks and fork lifts. Typical applications include monitoring and measuring low pressure for fuel rail, high pressure for tank pressure or combined pressure and temperature.

The sensors are utilised to optimise fuel metering and control combustion, improving emissions and engine performance. The original equipment manufacturer (OEM) will design in a Kavlico fuel rail sensor to measure the absolute pressure of the fuel at the inlet of the injectors. Kavlico's stainless-steel LNG and CNG sensors utilise a thin-film (TiON) sense element and are available in pressure ranges up to 250barG.

Operating on 5VDC, the sensors provide a linear amplified analogue output of 0.5-4.5VDC proportional to pressure. The operating temperature range is -40C to +140C across the full operating range. The lightweight sensor can be configured with a variety of electrical and process connections to meet each OEM's application-specific requirement.

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