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Bypass mass flow meter

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article image Type 8701 and Type 8711 Mass Flow devices from Burkert Fluid Control Systems.

BURKERT Fluid Control Systems has launched the new Type 8701 Mass Flow Meter (MFM) and Type 8711 Mass Flow Controller (MFC) in Australasia, giving process operators faster, more accurate and more flexible system control.

The modular 8701 and 8711 devices, which are available in a variety of materials for different gas characteristics, take gas flow measurement and control to a new level of accuracy with semiconductor sensor arrays built directly into device bypass ventricles. The units are capable of dual calibration for multiprocess operation.

These capabilities are particularly relevant to food and beverage, environmental and water, waste stream, packaging, laboratory, medical, thin film tech, analyser, heat treatment, industrial laser industries, as well as related industries in which gas flow must be measured and controlled.

Burkert uses a new mass flow sensor technology that, in addition to the actual sensor, integrates analogue electronics, linearisation, temperature compensation and analogue to digital conversion on one single chip.

To achieve this level of functionality, the Burkert mass flow sensor is operated via a powerful microprocessor that is integrated into the fundamental controls of the devices to directly generate a digital output signal.

Burkert's Type 8701 measures gas mass flow by diverting a miniscule volume of flowing gas into a bypass channel in which the sensor is located.

Passing over the sensor, gas mass flow is measured according to the thermal principle, which has the advantage of delivering direct mass flow without correction for pressure and temperature. Flow is read as an analogue output, or digitally over RS232- or RS485-communication.

The semiconductor sensor element is a (semiconductor) chip located in the bypass channel. The sensor part of the chip, produced with CMOS technology, contains a heating resistor and two temperature sensors (thermopiles) that are arranged symmetrically upstream and downstream of the heater.

The differential temperature measured by thermopiles is a measure of the mass flow rate passing this bypass channel. The highly accurate 32 point calibration stimulates an unique assignment of the sensor signal to the total flow rate passing the device.

Burkert's new mass flow devices are suited to use in a stand-alone capacity, a modular system component or as a building-block in a comprehensive automation system solution.

Complementary Burkert technology products add easily to the 8701 and 8711 for complete fluid control solutions.

Recommended modular additions include the Type 1150 Multi-channel programme controller, Type 0330 3/2 or 2/2 way valves, Type 6013 2/2 way valve and MFC mass flow control configuration software (comes free of charge with each device).

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