Adaptability of Tuning Fork Liquid Level Switch to Specific Level Measurement

The piezoelectric devices of Jiwei Tuning Fork Liquid Level Switches are utilized to achieve vibration drive and detection. Once resonant vibrating fork comes in contact with measured medium, vibration frequency of forks substantially decreases, and the output signal from piezoelectric detection device decreases accordingly. Then an integrated circuit is designed to analyze the signal from piezoelectric device and output a switch signal as a result.

However, for different media, tuning fork liquid level switch has different adaptability. To debug the level switch is a crucial step to achieve accurate measurement.

For most peers, tuning fork liquid level switches are generally debugged with water. That is, after powered on, the tines are slowly and vertically immersed into the water about13 of the tines’ length, and then set the alarm signal, as known as switching point.

Jiwei Ring-11 Liquid Level Switch is with only 40mm fork length, the lowest measurable medium density can be as low as 0.5g/cm³. Depend on specific medium and the density, measurement accuracy and reliability will inevitably be greatly reduced if only debug with water. Therefore, Jiwei engineers always set the switching point according to specific medium. For example, for foam or viscous liquid, it is necessary to debug and set the immersed depth of the tines correspondingly.

In paper industry, paper pulp is viscous and full of foam. If the switching point does not set accurately, the tines will switch while touching the medium. Jiwei engineer has been moderately adjusted the switching point, that is, inserted the tines into the paper pulp deeper (more than 5mm), which was also called switching after blunting 5mm. Thus, the switching signal output with appropriate delay (1 ~ 2 seconds). After re-setting, all Ring-11s can accurately and reliably run the in the operation.

This practice has proved that the adaptability of tuning fork liquid level switch is different for various working conditions. For complex working conditions such as waves, foam or bubbles, the instrument needs to debug its switching point and delay the signal output according to specific conditions and media, and should install the instrument away from the tank inlet.