German FAV instrument sensor, FAV instrument model, FAV instrument price

FAV instrument sensor for level measurement is a pressure sensor. The static pressure submersible level transmitter (level gauge) is based on the principle that the static pressure of the measured liquid is proportional to its height. It uses advanced foreign isolated diffused silicon sensitive elements or ceramic capacitive pressure sensitive sensors to convert static pressure into electrical signals, which are then converted into standard electrical signals (typically 4 to 20mA/16VDC) after temperature compensation and linear correction.

FAV instrument sensor classification

Load cells are classified by conversion method into 8 types, including photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscopic, and resistive strain gauge, with resistive strain gauge being the most widely used. 1) Photoelectric type: Includes grating and code disk types. Grating sensors use Moiré fringes formed by gratings to convert angular displacement into photoelectric signals. There are two gratings: one fixed grating and one moving grating mounted on the dial shaft. The object under test on the load-bearing platform rotates the dial shaft through a force transmission lever system, driving the moving grating to rotate and causing the Moiré fringes to move. By using a phototube, conversion circuit, and display instrument, the number of moved Moiré fringes can be calculated to measure the angle of grating rotation, thereby determining and reading the mass of the object. Code disk sensor: The code disk (symbol plate) is a piece of transparent glass mounted on the dial shaft, featuring black and white codes arranged according to a specific encoding method. When the object on the load-bearing platform rotates the dial shaft via the force transmission lever, the code disk also rotates by a certain angle. The photocell receives the light signal passing through the code disk and converts it into an electrical signal, which is then digitally processed by the circuit, finally displaying the digital value representing the measured mass on the display. Photoelectric sensors were mainly used in electromechanical combination scales. 2) Hydraulic type: When subjected to the gravity P of the object under test, the pressure of the hydraulic oil increases, and the degree of increase is proportional to P. By measuring the increased pressure value, the mass of the object can be determined. Hydraulic sensors have a simple and robust structure and a large measurement range, but the accuracy generally does not exceed 1/100. 3) Capacitive type: It operates based on the proportional relationship between the oscillation frequency f of the capacitor oscillator circuit and the distance d between the plates. There are two plates, one fixed and the other movable. When the object under test is loaded on the load-bearing platform, the leaf spring deflects, changing the distance between the two plates, and thus changing the oscillation frequency of the circuit. By measuring the change in frequency, the mass of the object on the load-bearing platform can be calculated. Capacitive sensors consume little power, have low cost, and have an accuracy of 1/200 to 1/501.

FAV instrument sensor structure and composition

1) Sensitive element: An element that directly senses the measured quantity (mass) and outputs another quantity with a definite relationship to the measured quantity. For example, the elastic body of a resistive strain gauge load cell converts the mass of the object into deformation; the elastic body of a capacitive load cell converts the measured mass into displacement. 2) Conversion element: Also known as a sensing element, it converts the output of the sensitive element into a signal that is easy to measure. For example, the resistive strain gauge (or strain foil) of a resistive strain gauge load cell converts the deformation of the elastic body into a change in resistance; the capacitor of a capacitive load cell converts the displacement of the elastic body into a change in capacitance. Sometimes certain elements perform the functions of both sensitive and conversion elements. For example, the piezoelectric material of a voltage-type load cell outputs electrical charge while deforming under external load. 3) Measurement element: Converts the output of the conversion element into an electrical signal, facilitating further transmission, processing, display, recording, or control. For example, the bridge circuit in a resistive strain gauge load cell, and the charge preamplifier in a piezoelectric load cell. 4) Auxiliary power supply: Provides energy for the electrical signal output of the sensor. Generally, load cells require an external power supply to operate. Therefore, as a product, the power supply requirements must be specified, but it is not considered part of the load cell. Some sensors, such as magnetoelectric velocity sensors, do not require an auxiliary power supply to operate normally because they output sufficient energy. Therefore, not all sensors require an auxiliary power supply.

FAV instrument sensor installation precautions

1) Handle load cells with care, especially small-capacity sensors with aluminum alloy elastic bodies. Any impact or drop caused by vibration is likely to cause significant output errors. 2) When designing the loading device and during installation, ensure that the line of action of the loading force coincides with the force axis of the load cell to minimize the effects of inclined and eccentric loads. 3) Regarding level adjustment. If using a load cell, adjust the installation plane of its base with a spirit level until it is horizontal; if multiple sensors are used for simultaneous measurement, their base installation surfaces should be kept as level as possible. The main purpose of this is to ensure that the force borne by each sensor is basically consistent. 4) Determine the rated load of the sensor used based on the load cell capacity selection in its instructions. 5) To prevent chemical corrosion, apply Vaseline to the outer surface of the load cell during installation. Avoid direct sunlight and environments with drastic temperature changes. 6) Install bypasses made of copper braided wire at both ends of the load cell loading device. 7) Do not extend the cable yourself. If extension is absolutely necessary, solder the joints and apply moisture-proof sealant. 8) It is best to use baffles to cover the sensor around the load cell. This prevents debris from falling into the moving parts of the sensor, affecting its measurement accuracy. 9) Keep the sensor cable away from high-power power lines or places with pulse waves. If avoidance is impossible, run the load cell cable separately through an iron pipe and shorten the connection distance as much as possible. 10) Determine the rated load of the sensor used based on the load cell capacity selection in its instructions. Although load cells have a certain overload capacity, avoid such situations during installation and use. Short-term overloading may sometimes cause permanent damage to the sensor. 11) For high-precision applications, allow the load cell and instrument to warm up for 31 minutes before use.

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