DUT type intelligent displacer liquid level meter is a modern scientific and technological instrument used for the measurement and control of the liquid level, boundary level and density of various liquids in the production process of various industries. It has the characteristics of high measurement accuracy, stable performance and strong anti-interference ability. And it can be networked with fieldbus devices that conform to HART protocol to realize digital two-way communication and automation of process detection and control. Widely used in petroleum, chemical, metallurgy, electric power, and light industry and other industries.

Working principle and composition
DUT type intelligent displacer level gauge is composed of displacer measuring chamber, measuring mechanism, displacer and so on. According to the different measuring mechanisms, it can be divided into two types: torque tube type intelligent displacer level gauge and lever type intelligent displacer level gauge.

Working principle
Torsion tube type intelligent float level gauge: The float immersed in the liquid is affected by the downward gravity, the upward buoyancy and the upward torsion tube elastic force. When these three forces are balanced, the buoy is at rest in a certain position. When the liquid level changes, the buoyancy of the buoy also changes, and the balance of the force is broken, causing the elastic force of the torsion tube to change, so that the torsion tube twists and achieves a new force balance. The torque tube drives the sensor to generate angular displacement, and through the signal processing circuit, an electrical signal output that changes with the liquid level is generated.
Lever-type intelligent float level gauge: Through the lever principle and the method of measuring stress, the buoyancy change of the inner cylinder is measured, and the measurement signal consistent with the level change is obtained by the high-precision sensor, and then processed by the microprocessor After that, the specific reading is directly displayed on the liquid crystal display or converted into a standard signal output of 4-20mA by a special circuit.

Technical advantages
The DUT type intelligent displacer level gauge has the advantages of high linear signal processing accuracy, strong anti-interference ability and stable operation. The operator can remotely operate it in the centralized control room, such as configuration, monitoring, maintenance and calibration. This type of instrument head has a unique design, and each working chamber is isolated, which is safe and reliable, and greatly improves the accuracy and stability of the instrument. The device has a variety of installation methods, which can meet the installation requirements of different working conditions, and can be equipped with explosion-proof and heat tracing functions according to the needs of on-site working conditions.

Selection example:
DUT-NL6.4 I-T500/Jd
DUT type intelligent displacer level gauge Measuring structure: torque tube type; measuring type: measuring liquid level; design pressure: 6.4Mpa; material: carbon steel; temperature: -40℃≤T≤120℃; center distance: 500mm; Thermal, isolated explosion-proof

The main technical parameters
Measurement accuracy: ±0.5%
Sensitivity: 0.05%
Power supply: 24V DC;
Output signal: 4～20mA superimposed digital signal conforming to HART protocol;
Outlet: 1/2" NPT(F)
Load resistance: 230～1100Ω;
Damping time selection: 0 to 32 seconds;
Measuring range: 300mm~2000mm (can be produced beyond the range);
Design pressure: 0～6.4MPa (lever type intelligent float level gauge); 0～42MPa (torsion tube type intelligent float level gauge)
Nominal diameter: DN40 or according to user requirements;
Medium density: 0.4～2.0g/cm3
Minimum density difference of measurement boundary: ≥0.2g/cm3;
Explosion proof mark: Ex d II C T5 Gb Ex tD A21 IP66 T83℃
Ex ia II C T5 Ga Ex iaD 20 T83℃
Shell protection grade: IP66

Product selection table