German BENEDETTI PRESSE sensors, BENEDETTI PRESSE models, BENEDETTI PRESSE prices

BENEDETTI PRESSE sensors are sensors that can sense temperature and convert it into usable output signals. Temperature sensors are the core component of temperature measuring instruments and come in a wide variety. According to the measurement method, they can be divided into two major categories: contact and non-contact. According to sensor materials and electronic component characteristics, they are divided into two types: thermal resistors and thermocouples. Valve BENEDETTI PRESSE sensor structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the linear encoder. The key component of the grating detection device is the grating readhead, which comprises a light source, a condenser lens, an index grating, photoelectric elements, and an adjustment mechanism. There are many structural forms of grating readheads. Based on the structural characteristics of the readhead and the application scenarios, they are classified into direct-receiving readheads (also known as silicon photovoltaic cell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads).

BENEDETTI PRESSE sensor principle

The essence of a grating displacement sensor is to use the grating pitch as a standard ruler for measurement. High-resolution linear encoder scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly adopt electronic subdivision methods. When two gratings overlap with a slight inclination angle, Moiré fringes are generated in the direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes also move up and down. This converts the measurement of the grating pitch into the measurement of the number of Moiré fringes. Within one Moiré fringe width, placing 4 photoelectric devices at certain intervals can achieve electronic subdivision and direction judgment functions. For example, for a linear encoder scale with 50 line pairs/mm, its grating pitch is 0.02mm. If four-fold subdivision is adopted, counting pulses with a resolution of 5μm can be obtained, which has reached a very high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected, so at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are usually used. The 4 photoelectric signal paths obtained from 4 photosensitive devices are respectively sent to the input terminals of 2 differential amplifiers. The two signal paths output from the differential amplifier have a phase difference of π/2. To obtain direction judgment and counting pulses, these two signal paths need to be shaped, first shaping them into square waves with a duty cycle of 1:1. Then, by discriminating and comparing the phase of the square waves, the movement direction of the linear encoder scale can be obtained. By counting the square wave pulses, the displacement and speed of the linear encoder scale can be obtained.

BENEDETTI PRESSE sensor usage precautions

When plugging or unplugging the connector between the linear encoder sensor and the digital display unit, ensure the power is turned off. Install an external protective cover whenever possible, and promptly remove chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the housing of the linear encoder sensor. Regularly check whether the mounting and connection screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, even layer of silicone oil to the strip, taking care not to splash it onto the engraved surface of the glass grating. To ensure the reliability of the linear encoder sensor, clean and wipe the scale surface and the index grating surface at regular intervals with an ethanol mixture (50%) to keep the glass grating scale surface clean. The linear encoder sensor must not be subjected to severe vibration or impact, as this may damage the scale; if the scale breaks, the sensor will fail. Do not disassemble the linear encoder sensor yourself, and never arbitrarily change the relative gap between the main scale and the secondary scale. Otherwise, this may compromise the accuracy of the sensor and cause relative friction between the main and secondary scales, damaging the chrome layer and thus the grating lines, rendering the scale unusable. Take care to prevent oil stains and water from contaminating the scale surface, as this can disrupt the distribution of the grating lines and cause measurement errors. Avoid operating the linear encoder sensor in environments with severe corrosive effects to prevent corrosion of the chrome layer and the scale surface, which would degrade the quality of the scale.

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