Ultralow flow gas monitor

Sunday, 13 October, 2002 | Supplied by: Ross Brown Sales Pty Limited


The MilliGascounter is designed for the measurement of small amounts of gas with ultra low flow rates. It is suitable for measuring all inert and slightly aggressive gases, in particular those encountered in biogas technology or in leak rate detection.

The gas to be measured flows through the gas inlet nozzle and up into the MilliGascounter (MGC) casing through a micro capillary tube. The MGC casing is filled with a packing liquid. The gas rises as small bubbles through the packing liquid and collects in the measurement cell. The measurement cell lies fully within the packing liquid and tilts over an axle. The measurement cell consists of two measuring chambers, which are filled alternatively by the rising gas bubbles. When a measuring chamber is full, the buoyancy of the filled chamber causes the measurement cell to tip over abruptly into such a position that the second measuring chamber begins to fill and the first empties.

Through the combination of a permanent magnet and magnetic sensor (reed contact), this tilting procedure creates a pulse which is registered by a counter mechanism. The measured gas escapes through the gas output nozzle.

The minimum flow rate is theoretically 0 L/h, as there are no mechanical limitations on the MGC which would restrict the minimum flow.

However, at such micro flow rates, there are influences external to the MGC which become evident (tightness of the tube connection, permeability of the gas tubing). The minimum flow rate has therefore been defined as 1 mL/day. The maximum flow rate is 1.2 L/h. Through a special manufacturing technique and high precision calibration, a measurement accuracy of ±3% has been achieved.

The volume is measured with a Resolution of 1 mL. The volume of the measured gas is displayed on an electronic counter/display located on the top of the MGC casing.

Online: www.rossbrownsales.com.au
Phone: 02 9899 2744
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