A detector to measure the water content of molding sand with capacitance sensor is introduced.Micro-capacitance measuring technique is applied to detect the signal

then the data is processed and controlled by SCM.A measuring precision is higher than 1 %

and other merits are convenience at use

fast measuring speed

stable performance and easy controlling

the detector can be used as a portable meter

meanwhile it works to realize the automatic control of adding water to the sand at the product line.