The current level measurement technology uses new technology to measure. In these devices, the distance between the liquid level and a reference point at the sensor or transmitter located near the top of the container is measured. The system generates a pulse wave at the reference point, which is transmitted through the conductor or vapor space. The wave is then reflected from the liquid surface and retransmitted to the pickup at the reference point.
By improving the accuracy of liquid level measurement, the variability of the chemical process can be reduced, thereby helping to improve product quality and reduce costs and waste. Electronic records, the accuracy and reliability of electronic records are more stringent. The use of new level measurement technology can meet these requirements.
The benefits of using a magnet to limit the float to determine the liquid level have been proven. In addition, magnetostriction is an established technology that can accurately record the position of the float. Magnetostrictive transmitters can be used instead of mechanical linkages to use wires to determine the speed of torsional waves to locate the float and report its position.
At the transmitter, the sensor wire is connected to the piezoelectric ceramic sensor, and at the opposite end of the sensor tube, a tension clamp is attached. There are two ways to place the sensor tube: one is through a hole in the center of the float, and the other is to place it next to the float outside the non-magnetic float.
The transmitter sends a short current pulse through the sensor wire to position the float, which sets a magnetic field over its length. The timing circuit is turned on at the same time.
This magnetic field immediately interacts with the magnetic field generated by the float magnet, causing a torsional force in the wire when current flows through the wire. This twist is transmitted to the piezoelectric ceramic sensor at a certain speed. When the sensor detects the tension wave, it generates an electrical signal. This signal implies the timing circuit where the wave arrived, so the timer circuit stops. The time interval (TOF) between the start of the current pulse and the arrival of the wave is measured by a timing circuit.
The floating position can be accurately determined based on this information, and the transmitter presents this information as a level signal. The main advantage of this measurement method is that the signal speed is known and consistent with process variables such as pressure and temperature. In addition, the signal is not affected by beam divergence or false echoes and bubbles. Another advantage is that there are not many moving parts, and the float is the only moving part.
Post time: 04-11-21