FT8511 Series Magnetostrictive Liquid Level Gauge

The FT8511 series magnetostrictive level gauge is based on the principle of magnetostriction and is a two-wire intrinsic safety level gauge. It is used for accurate and reliable process level measurement and tank capacity measurement and control in the measurement and control fields of petroleum, petrochemical, chemical, food, and other industries.

》》》》Measurement principle
The magnetostrictive sensor is the core of the magnetostrictive liquid level monitoring system, and the core sensitive element of the sensor (magnetostrictive wire) has the characteristics of high strain value and strong electrical (magnetic) mechanical wave conversion ability, which can convert small magnetic vector changes into mechanical waves. The sensor consists of two parts: a stainless steel rod (with built-in magnetic extension wire) and a floating ball (with built-in rare earth permanent magnet). When the electric pulse generated by the pulse generator in the electronic component is transmitted along the magnetostrictive wire inside the steel pipe, the electric pulse current simultaneously generates a circular magnetic field perpendicular to the magnetostrictive wire and propagates along the magnetostrictive wire at the speed of light.
When the electric pulse ring magnetic field meets the inherent magnetic field of the float, the two magnetic fields interact, generating instantaneous torque and forming a mechanical torque wave pulse on the magnetostrictive line. The mechanical torque wave is transmitted back to the electronic component at a certain speed. Electronic components pick up pulses, and by measuring the time difference between the emitted electrical pulse and the returned torque wave pulse, the height or level of the measured liquid surface can be accurately calculated.

》》》》Characteristics
Modular design: Instrument sensors and electronic units can be interchangeable and universal, facilitating spare parts and maintenance.
Split installation: Suitable for various application scenarios, easy to control and observe.
Can be used in conjunction with external float type float level gauges: more diverse applications.
HART communication: Comes with industrial field two-wire 4-20mA HART communication.
On site button calibration: It can directly calibrate high and low liquid levels through the two buttons at the top of the unit, making it convenient and fast to use.

》》》》Typical applications
Finished oil storage tank
Gas station oil tank
Process tank leakage detection
Various chemical reagents
Water and sewage treatment
Other high-precision liquid level detection

》》》》Performance indicators

Measurement equipment level: CAT I level, transient rated voltage 1500V, cannot be used for levels other than CAT I level
Output: 4-20mA HART protocol, software adjustable current output direction
Measurement method: The software can be set as a level/distance measurement method
Power supply: 12-35VDC; Requirement for intelligent communication: power supply of 15-35VDC
Power: less than 0.5W
Accuracy: ≤ 0.1% FS or 1mm (whichever is greater)
Resolution: ≤ 0.04% FS or 0.4mm (whichever is greater)
Repeatability: ≤ 0.04% FS or 0.4mm (whichever is greater)
Linear correction: 10 point nonlinear correction can be selected by software (if necessary)
Temperature effect: 0.1%/10 ℃ (18 ℉)
Load resistance: Output circuit load resistance capacity of 600 Ω at 24VDC
Environmental temperature: T5: -40 to+70 ℃ (-40 to 158 ℉); T6:-40～+60℃(-40～140℉)
The influence of medium temperature on ambient temperature cannot exceed the requirements of the instrument for ambient temperature
Response time:<2 seconds
Delay: Adjustable from 1 to 90 seconds (software adjustable)
Range: 0~5m (hard pole), 0~20m (soft cable)
Dead zone: The upper dead zone is ≤ 1/2 of the float height,
Dead zone pole type: one floating ball height; Cable type: 250mm~450mm
Maximum process temperature: -40~+400 ℃ (see probe performance indicators for details)
Maximum process pressure: 10MPa (see probe performance indicators for details)
Cable length: The maximum length of a split cable is 3 meters
Electrical interface: M20X1.5 (optional 3/4 "NPT)
Process connection: NPT thread installation (standard, optional BSPT), flange installation (optional)
Explosion proof rating: ExiaIIBT5/T6 Ga and Exd IIBT5/T6 Gb
Protection level: Compliant with IP67 protection standard
Certification: CMC, PCEC/NEPSI. For other certifications, please consult the manufacturer