German EMEC sensors, EMEC models, EMEC prices

EMEC sensors are devices that convert magnetic signals into electrical signals. By utilizing the transformation relationship between magnetic quantities and other physical quantities, with the magnetic field as a medium, they can also convert signals of other non-electrical physical quantities into electrical signals. There are two driving methods: one is driven by a permanent magnet, and the other is driven by an electromagnetic coil. The former is mostly used for detection; for example, if a moving part is made of a magnet, it will attract and emit a signal once it approaches the magnetic induction sensor. The latter is mostly used for control; if the electromagnetic coil is energized, the contacts will attract. Using magnetic induction sensors to replace limit switches that rely on collision contact can improve system reliability and service life; therefore, they are often used in programmable logic controllers (PLCs) as signaling devices for position arrival.

EMEC sensor classification

Load cells are classified into 8 types based on conversion methods, including photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscope, and resistance strain gauge types, with resistance 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 measured object placed on the weighing platform rotates the dial shaft through the force transmission lever system, driving the moving grating to rotate and causing the Moiré fringes to move accordingly. Using phototubes, conversion circuits, and display instruments, the number of moved Moiré fringes can be calculated to measure the angle of grating rotation, thereby determining and reading the mass of the measured object. Code disk sensors: A 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 measured object on the weighing platform rotates the dial shaft via the force transmission lever, the code disk also rotates by a certain angle. Photocells receive light signals passing through the code disk and convert them into electrical signals, which are 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 measured object, 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 measured 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 measured object is loaded onto the weighing platform, the leaf spring deflects, changing the distance between the two plates, and the oscillation frequency of the circuit changes accordingly. By measuring the change in frequency, the mass of the measured object on the weighing platform can be calculated. Capacitive sensors consume little power, have low cost, and have an accuracy of 1/200 to 1/500.

EMEC sensor features

Resistors, inductors, and capacitors are the three major categories of passive components in electronic technology. A capacitive sensor is a sensor that converts changes in the measured quantity into changes in capacitance; it is essentially a capacitor with variable parameters. Capacitive sensors have the following advantages: high impedance, low power consumption, and very low input energy requirement. They can achieve large signal changes, resulting in a high signal-to-noise ratio and system stability. They feature fast dynamic response, with operating frequencies reaching several megahertz. They support non-b contact measurement, and the measured object can be either a conductor or a semiconductor. Their structure is simple and highly adaptable, allowing operation in harsh environments such as extreme temperatures and strong radiation, leading to wide application. With the development of electronic and computer technologies, disadvantages of capacitive sensors, such as susceptibility to interference and the influence of stray capacitance, have been continuously overcome. Furthermore, capacitive grating displacement sensors and integrated capacitive sensors have been developed. Therefore, they are widely used in non-electrical quantity measurement and automatic detection, capable of measuring parameters such as pressure, displacement, rotational speed, acceleration, A degree, thickness, liquid level, humidity, vibration, and component content. Capacitive sensors have promising development prospects.

EMEC sensor installation precautions

1) Handle load cells with care, especially small-capacity sensors using aluminum alloy as the elastic body. 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 axis of the loading force coincides with the force-bearing axis of the load cell to minimize the effects of inclined and eccentric loads. 3) Regarding level adjustment. If using load cells, the installation plane of their bases must be adjusted with a spirit level until horizontal. If multiple sensors are used for simultaneous measurement, their base installation surfaces should be kept on the same horizontal plane as much 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 specified in its instructions. 5) To prevent chemical corrosion, apply Vaseline to the outer surface of the load cell during installation. Avoid use in locations with direct sunlight exposure and drastic environmental temperature changes. 6) Add bypasses made of copper braided wire to both ends of the load cell loading device. 7) Do not extend the cable yourself. If extension is absolutely necessary, solder at the joint and add 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's 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 specified in its instructions. Although load cells have a certain overload capacity, such situations should be avoided during installation and use. Sometimes, short-term overload may cause permanent damage to the sensor. 11) For high-precision applications, the load cell and instrument should be used after preheating for 30 minutes.

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