Magnetostrictive level gauge

Magnetostrictive level gauge is widely used in the measurement and control of liquid level and interface in the fields of process control, petroleum processing, pharmaceutical, food processing, water treatment, tank farm management, underground inventory of gas stations and so on. HJ-Zncy series two-wire high precision intelligent magnetostrictive level gauge is developed based on the principle of magnetostrictive induced torsion wave, which can measure the liquid level and interface simultaneously. Because it is not affected by pressure, temperature, dielectric constant and other factors in the measurement process, it has the advantages of high accuracy, good stability, high reliability, long service life, maintenance-free, safe and reliable.

The magnetostrictive level gauge consists of three parts: the probe rod, the circuit unit and the float. With HART protocol, can adjust the zero and range remotely. Various parameters can also be adjusted by three buttons and LCD in the case. The configurable parameters include unit, display upper and lower limits, damping, translation correction, calibration upper and lower limits, digital and analog fine-tuning correction, and restoration of factory Settings. When the level gauge is measured, the circuit unit generates a current pulse, which travels down the magnetostrictive line and generates a circular magnetic field. A float is provided outside the detecting rod, which moves up and down along the detecting rod as the liquid level changes. The float generates a magnetic field at the same time because it has a set of permanent magnets inside it. When the current's magnetic field meets the float's magnetic field, a "warp" or "return" pulse is generated. The time difference between the "return" pulse and the current pulse is converted into a pulse signal, so as to calculate the actual position of the float and measure the liquid level.

Characteristics of magnetostrictive level gauge:

1. Two-wire system, high precision, with HART protocol;

2. Both remote and local adjustment of zero and range;

3. Self-diagnosis ability and fault output alarm function;

4 with non-volatile memory is not afraid of power loss data;

5. Good long-term stability and easy installation;

6. Can measure liquid level and interface at the same time;

7. Long service life, maintenance-free, low operating cost;

8. Optional integrated lightning protection terminal;

9. Multi-function LCD digital field indicator;

10. Integral explosion-proof design, with table cover locking explosion-proof screws;

11. Internal and external double grounded terminals, easy to ground on site;

12. Design of external listing hole, which can hang station number plate, etc.;

13. Case with terminal prompt.

Technical parameters of magnetostrictive level gauge:

Measuring range: 0.1 ~ 6m

Accuracy: ±1mm or 0.1%, whichever is greater

Separation rate: 0.1mm

Applicable medium: liquid compatible with the probe material

Working pressure: ≤ 4.0MPa

Operating temperature: -40 ~ 85℃ (-20 ~ 70℃ with LCD head)

Medium temperature: -40 ~ 100℃(high temperature type -40 ~ 200℃)

Medium density: 0.5 ~ 2.0g/cm3

Viscosity of medium: ≤0.8Pa•S

Stability: ± 0.1%FS/year

Temperature coefficient: 0.1% /10℃ in the ambient temperature range

Power supply voltage: 24VDC

Output signal: 4 ~ 20mDC two-wire system

Load: 50×(power supply voltage -9)Ω

Zuni: adjustable between 0 ~ 24S

Dead zone: upper dead zone 50mm; The dead zone of 50 mm

Power influence: less than 0.005%/V of the output range

Load influence: when the supply voltage is constant, the load change has no effect

Influence of humidity: 0 ~ 95% relative humidity has no effect

Vibration influence: for L0g peak value, the influence is less than 0.1% FS at 20 ~ 2000Hz

Shell: molded cast aluminum (coated with epoxy resin)

Protection grade: probe IP68, the head IP65

Anti - explosion: flameproof type: D ⅡBT5; Intrinsically safe: IA ⅡCT6

Field indication: multi-function LCD digital display table

Electrical interface: M20×1.5

Process connection: DN50, DN80, DN100 flange or M20×1.5, G3/4" thread or special customization

Probe material: 304, 316L, PP, PVC, PTFE

Float material: 304, 316L, PP, PTFE

Ground connection: the instrument shell should be well connected to the tank wall and the ground

Typical applications of magnetostrictive level gauge:

1. Measurement and control of liquid level in industrial field

2. Tank level measurement;

3. Chemical process liquid level control;

4. Pharmaceutical tank level control;

5. Food and beverage liquid tank control;

6. Dam water level monitoring;

7, drinking water and sewage treatment and so on.