The floating ball liquid level transmitter consists of three parts: magnetic levitation ball, sensor, and transmitter. When the magnetic levitation ball floats up and down along the conduit with the change of liquid level, the magnetic steel inside the float attracts the reed switch at the corresponding position in the sensor, causing the total resistance (or voltage) of the sensor to change. Then, the transmitter converts the changed resistance (or voltage) signal into a 4-20mA current signal output. And upper and lower limit alarms can be set on the display instrument to achieve positional control of the liquid level.

Structure principle of floating ball liquid level transmitter:

It consists of two parts: a liquid level sensor and an intelligent HART board (current converter). The float changes synchronously with the liquid level, controlling the suction and disconnection of the reed switch, so that the resistance inside the sensor changes linearly. The converter then converts the resistance change into a 4-20mA standard current signal and superimposes it with the HART digital signal output.

Characteristics of floating ball level transmitter:

1. Intelligent electronic components consist of a motherboard and a LCD screen;

2. The maximum and zero points can be adjusted locally by pressing the button;

3. This intelligent instrument can be used for double-sided communication with a HART communication handheld device or microcomputer without interrupting the output signal. It is suitable for explosion-proof or inconvenient instrument disassembly places to access or modify measurement, process parameters, equipment configuration, calibration, and diagnostic information of the instrument through the HART protocol;

4. Bidirectional communication with the host in a distributed control system using the HART protocol;

5. Equipped with EEPROM, data will not be lost due to power failure.

Parameters of floating ball level transmitter:

Measurement range: 0~3500mm

Supply voltage: 12~36V DC

Output signal: two-wire system 4-20mA DC superimposed digital signal, composed of

Users choose square root or linear output;

Load resistance: 250 Ω

Measurement accuracy: ± 10mm

Environmental temperature:- 40~80℃

Working temperature:- 20~120℃

Nominal pressure: ≤ 1.6MPa

Flange standard: A: JB/T82.1-94 (flat flange)

DN100 PN1.6 ball with a diameter of 90

B: JB/T82.1-94 (Flat Flanges)

DN80 PN0.6 ball with a diameter of 76

Medium density: ≥ 0.65g/cm­3

Medium viscosity: ≤ 0.015PaS

Liquid receiving material: stainless steel

Protection level: IP65