Accuracy Adjustment of Magnetic Level Indicator and Remote Transmitter

Magnetic Level Indicator is based on the law of magnetic coupling effect to achieve real-time level measurements and display. Within the chamber is a magnetic float assembly inside, which floats on the fluid’s surface. As the fluid level rises or falls, so does the magnetic float. As the float moves up or down, the magnet assembly rotates a series of bi-color magnetic flags or flaps, changing the visual indicators mounted just outside the chamber from one color to the other.

Magnetic Level Indicator can be used for level detection of hazardous / flammable liquids at various towers, containers, tanks, spherical vessels, boilers in Chemical, Fertilizer, Petrochemical, Pharma, Pesticide and other industries. The ultimate safety and simple structure prevent glass breakage and gland leakage. The excellent visibility advances the clear on-site indication.

Remote Transmitter may be considered for giving the capability to transmit a level measurement signal remotely, which is fixed on the side of the chamber of Magnetic Level Indicator with clamps binding, and within a 12mm installed distance to the chamber through the same coupling magnetic field.

To ensure the consistency and accuracy of the measurement results, there is a key link in the production process on the calibration and accuracy adjustment between the indication and the remote transmission output to ensure they are synchronized.

First, need to determine the zero position of the float. Place the magnetic float parallel to the bottom of the visual indicator, and then move it slowly upward until the first bi-color flap changes from white to red. At this moment, the position corresponding to the 0 scale level on the indicator is the float zero position with the ± 5mm measurement accuracy of the remote transmitter. Stop moving the float when the bottom of the indicator turns white to red from the second flap, the position corresponding to the 0 scale level on the indicator is the float zero position with the ± 10mm measurement accuracy of the remote transmitter.

Next, the current of remote transmitter should be corrected. Align the zero point of the float with the marked zero position to the lowest end of the transmitter tube, adjust the 4mA potentiometer to 4mA current value, then remove the float and adjust the 20mA potentiometer to 20mA current value. Replace the float aligns at the bottom of the transmitter again and move it up slowly. Observe the current value, stop moving the float when the current value changes for the first time from 4mA, the marked float zero position of the transmitter measurement accuracy is the starting 4mA position of the transmitter, as well as the zero position of the Magnetic Level Indicator.

Lastly, align the marked 4mA position point of the remote transmitter with the zero scale of the visual indicator and fix it on the chamber.