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Straight answers to the questions people ask most about flowmeters, cylinder connectors, adaptors and other regulator accessories.
A flowmeter has a small ball or float inside a tapered tube, and the ball rises as the gas flow increases. Mount the flowmeter upright, because it will not read correctly if it is tilted, and set the flow with the torch trigger pressed so that gas is actually moving.The maker's instructions show which part of the ball to read against the scale, often the top of it. Look at the scale straight on, not from above or below, to avoid reading it wrongly. Readings are usually in litres per minute.
The flowmeter only tells you what is leaving the regulator, not what arrives at the nozzle. Leaks in the hose or fittings, a blocked or partly blocked nozzle, a long or kinked hose, and a damaged gas diffuser can all make the real flow at the torch different from the setting.A draught can also blow the gas away from the weld even when the flow is right. If welds show porosity despite a sensible setting, measure the flow at the nozzle and check the whole gas line for leaks.
When carbon dioxide leaves a cylinder and expands, it gets very cold. At higher flows this can freeze the regulator, and the flow then becomes unsteady or stops altogether, which spoils the weld.A regulator heater warms the regulator body to prevent this. It is an electrical device, so check that its voltage matches your supply, keep the cable and plug in good condition and away from sharp edges, and follow the maker's instructions. For light or short jobs it is not always needed, but it is worth having for long welds or high flows.
A quick connector fits between the cylinder and the hose or flowmeter and lets you connect and disconnect the gas without a spanner. They are common with small and portable cylinders, where cylinders are changed often and speed is useful.Some are fixed-flow types set to a particular flow rate, and others are variable. Check the marking and the instructions for the gas, the flow range and the cylinder type. As with any gas fitting, check the connection for leaks after you make it, and keep it clean and free of oil.
