In order to conveniently and accurately detect horizontal bar level state of large type sprayer

liquid pendulum differential resistive tilt angle sensor is designed and fabricated. The sensor uses liquid self-leveling principle and the difference changing of resistance in liquid pendulum and the bridge circuit is used to convert tilt angle changing to voltage changing. The mercury tank is designed and constructed

the angle sensor device is fabricated with constantan for conductive wire. At room temperature 20 ℃

the calibration test and contrast test are conducted for obtaining the tilt experience formula. The test results show that the measurement precision is less than ± 1. 0 % in the range of tilt angle-20° ～ 20°

when the angle is at the range of-6° ～ 6°

the error is less than 0. 02°.