AUTOMATICALLY CALIBRATING INDUCTION TYPE SODIUM LEVEL METER

摘要

PURPOSE:To perform a calibration without the operation of a worker by providing arithmetic means for calibrating input signals from an A/D converter to prescribed level signals corresponding to a zero point and a span point by an manual input or a level switch detection output. CONSTITUTION:Electric signals corresponding to a sodium level 21 are continuously applied to a signal converter 23 from a level detecting coil unit 20 via a transmission line 22. The electric signals are converted to current level signals by the signal converter 23 and inputted to an A/D converter 24 and converted to digital signals thereby to be inputted to an automatic calibrator 25. The calibrator 25 calibrates sodium level signals from the converter 24 by conducting a prescribed arithmetic operation and a calibrated output is D/A-converted (26) to be level-displayed on a display 27. Thus, by preparing a program so as to determine a zero point and a span point, only raising a liquid level from a lower limit enables a calibration to be performed without the operation of a worker.