Germany PHARMEC COMPANY sensor PHARMEC COMPANY model PHARMEC COMPANY price

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

PHARMEC COMPANY sensor structure

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

PHARMEC COMPANY sensor principle

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

PHARMEC COMPANY sensor usage precautions

When plugging or unplugging the connector between the grating ruler sensor and the digital display unit, ensure the power is turned off. Add protective covers whenever possible, and promptly clean chips and oil splashed onto the ruler to strictly prevent any foreign matter from entering the grating ruler sensor housing. Regularly check whether installation connection screws are loose. To extend the life of the dust-proof sealing strip, apply a thin layer of silicone oil evenly on the sealing strip, taking care not to splash it onto the glass grating engraved surface. To ensure the reliability of the grating ruler sensor, clean and wipe the grating ruler surface and index grating surface with an ethanol mixture (50% each) at regular intervals to keep the glass grating ruler surface clean. Grating ruler sensors are strictly prohibited from severe vibration or impact to avoid damaging the grating ruler; if the grating ruler breaks, the sensor will fail. Do not disassemble the grating ruler sensor yourself, and do not arbitrarily change the relative spacing between the main grating and the secondary grating, as this may damage the sensor's precision and cause relative friction between the main and secondary gratings, damaging the chrome layer and thus the grating lines, rendering the grating ruler scrap. Prevent oil and water contamination of the grating ruler surface to avoid disrupting the grating line distribution and causing measurement errors. Avoid operating grating ruler sensors in environments with severe corrosion to prevent corrosion of the grating chrome layer and grating ruler surface, which would degrade quality.

Weidou Intelligent Technology professionally sells German PHARMEC COMPANY sensors, PHARMEC COMPANY proximity sensors, PHARMEC COMPANY distance sensors, PHARMEC COMPANY vision sensors, PHARMEC COMPANY displacement sensors, PHARMEC COMPANY load cells, PHARMEC COMPANY speed sensors, PHARMEC COMPANY photoelectric sensors, PHARMEC COMPANY position sensors, PHARMEC COMPANY angle sensors, PHARMEC COMPANY tactile sensors, PHARMEC COMPANY temperature sensors, PHARMEC COMPANY pressure sensors, PHARMEC COMPANY flow sensors, PHARMEC COMPANY level sensors, PHARMEC COMPANY motion sensors, PHARMEC COMPANY process sensors. Original German imports. Welcome inquiries and orders from users.