Magnetostrictive Level Transmitter MLT

MLT magnetostrictive level transmitters is designed according to the magnetostrictive principle, which is a highly accurate, respond fast, good reliability, long life, smart structure level measuring instrument.

Magnetostrictive level transmitter adopts two-wire system 4-20mA with HART for level measuring, which is widely used in the applications of petroleum, chemical, food , metallurgy and so on.

Operation principle

Magnetostrictive sensor is the heart of magnetostrictive level transmitter, while the core component of the sensor ( magnetostrictive line) is rare earth giant magnetostrictive material which enjoys the reputation of " black gold" in the modern industrial world. It has a high strain, electric (magnetic) mechanical wave conversion ability, etc., and can convert the small change of magnetic vector into a mechanical wave. The operating principle is as follows: Within the sensing tube there is a taut magnetostrictive line (1), along which the sensor circuit emits current pulse (2), resulting in a ring of magnetic field around the magnetostrictive line (3). There is a couple of permanent magnet steel in the level float (4), which magnetizes the magnetostrictive line in axial. The superposition of two magnetic fields produces a torsion pulse in the position of the float (5), which reaches both ends along the magnetostrictive line, one end to the sensing tube top accepted by the sensor and the other end to the bottom of the sensing tube. The time difference between emitting and receiving can be calculated to determine the position of the float.

Main technical parameters

Power supply: 9 ~ 28V DC

Output signal: 4 to 20mA+HART

Range: 40mm ~4000mm

Probe diameter: Φ12mm

Operating pressure: ≤5.0MPa

Medium temperature: -40 ℃~ +160 ℃

Ambient temperature: -40 ℃~ +80 ℃

Accuracy: ±1mm

Resolution: ≤0.1mm

Temperature influence: ≤±0.01%/ ℃

Min. density difference: 0.5g/cm³

Wetted material: 316L, Hastelloy C-276 (or on request)

Process connection: G1/2″, standard flange (or on request) or others

Power supply inlet: M20×1.5 (female thread)

Explosion-proof: Intrinsically safe Ex ia IIBT5/T6 Ga;

Explosion isolation Ex d IICT3/T6 Gb

Protection class: IP67