自动焊锡机的应用非常广泛，不仅仅是小作坊的自动焊锡机应用，也应用到工厂的生产线上。生产线在大量制造时，焊锡机中的助焊剂测量比重及稀释剂添加非常重要。最简单的方法，就时定时使用比重计测定，但如何添加正确数量的助焊剂或稀释剂，使比重维持在原来的值，则不容易。
When the production line is manufactured in large quantities, it is very important that the flux in the soldering machine measures the specific gravity and the addition of the diluent. The easiest way to do this is to use a hydrometer at regular intervals, but it is not easy to add the correct amount of flux or thinner to maintain the specific gravity.
比重控制器是利用置于机器上方的助焊剂及稀释剂容器接至助焊剂槽的管路上，装有电磁阀，电磁阀的开放及关闭受比重及液面感应器控制，助焊剂及稀释剂藉重力流入助焊剂槽中，而完成比重控制的工作。
The gravity controller is connected to the flux tank by a flux and thinner container placed above the machine. It is equipped with a solenoid valve. The opening and closing of the solenoid valve is controlled by the specific gravity and liquid level sensor. Flux and thinner. Gravity flows into the flux tank to complete the work of gravity control.
目前使用较为普遍的为数字式自动比重控制方式。为了达到焊锡作业的零缺点，助焊剂的比重正确与否很重要的。自动控制比以作业员用传统比重计测定要可靠，其测定误差在0.003到0.005之间，且可以结合传统的标准的比重计及试管互相比较。
At present, the more commonly used digital automatic gravity control method. In order to achieve the zero defect of the soldering operation, it is important that the flux is correct or not. The automatic control is more reliable than the measurement by the operator using a conventional hydrometer, and the measurement error is between 0.003 and 0.005, and can be compared with the conventional standard hydrometer and the test tube.
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