German EMHART sensor EMHART model EMHART price

EMHART sensors are components that convert changes in non-electrical quantities (such as speed and pressure) into changes in electrical quantities. Depending on the non-electrical quantity being converted, they can be classified into pressure sensors, speed sensors, temperature sensors, etc., and serve as parts and accessories for measurement, control instruments, and equipment.

EMHART sensor classification

Load cells are divided into 8 categories based on the conversion method, including photoelectric, hydraulic, electromagnetic force, capacitive, magnetic pole variation, vibratory, gyroscope, and resistive strain gauge types, with resistive strain gauge being the most widely used. 1) Photoelectric type: Includes grating type and code disk type. Grating sensors use Moiré fringes formed by gratings to convert angular displacement into optoelectronic 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 phototubes, conversion circuits, and display instruments, the number of moved Moiré fringes can be calculated to determine the angle of grating rotation, thereby determining and reading the mass of the object under test. 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 object under test on the load-bearing 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 object under test, the pressure of the hydraulic oil increases, with the degree of increase proportional to P. By measuring the increased pressure value, the mass of the object under test 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 onto the load-bearing platform, the leaf spring deflects, changing the distance between the two plates and consequently changing the oscillation frequency of the circuit. By measuring the change in frequency, the mass of the object under test on the load-bearing platform can be calculated. Capacitive sensors consume little power, have low cost, and offer an accuracy of 1/200 to 1/500.

EMHART sensor features

Resistors, inductors, and capacitors are the three major types of passive components in electronics. Capacitive sensors convert changes in the measured quantity into changes in capacitance; essentially, they are capacitors with variable parameters. Capacitive sensors have the following advantages: high impedance, low power, and requiring only very low input energy. They can achieve large change magnitudes, resulting in high signal-to-noise ratio and system stability. Fast dynamic response, with operating frequencies reaching several megahertz; suitable for non-b contact measurement, applicable to both conductive and semiconductor objects. Simple structure and strong adaptability, capable of operating in harsh environments such as high/low temperatures and strong radiation, with wide application. With the development of electronic technology and computer technology, disadvantages of capacitive sensors, such as susceptibility to interference and distributed capacitance, have been continuously overcome. Additionally, capacitive grid 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, speed, acceleration, A degree, thickness, liquid level, humidity, vibration, and component content. Capacitive sensors have promising development prospects.

EMHART 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 applied load coincides with the force 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 the base must be adjusted to horizontal using a spirit level. 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 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, it is advisable to coat the outer surface of the load cell with Vaseline during installation. Avoid direct sunlight and environments with drastic temperature changes. 6) Install bypassers made of copper braided wire at both ends of the load cell loading device. 7) Do not extend the cable line 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) Sensor cables should be kept away from high-power power lines or places with pulse waves. If avoidance is impossible, run the load cell cables separately through iron pipes 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. Short-term overloading may sometimes cause permanent damage to the sensor. 11) For high-precision applications, the load cell and instrument should be used after preheating for 30 minutes.

Weidou Intelligent Technology specializes in selling German EMHART sensors, EMHART proximity sensors, EMHART distance sensors, EMHART vision sensors, EMHART displacement sensors, EMHART torque sensors, EMHART speed sensors, EMHART photoelectric sensors, EMHART position sensors, EMHART angle sensors, EMHART tactile sensors, EMHART temperature sensors, EMHART pressure sensors, EMHART flow sensors, EMHART level sensors, EMHART motion sensors, EMHART process sensors. Original German imports. Welcome inquiries and orders from users.