German HITTECH GIETERIJ sensor HITTECH GIETERIJ model HITTECH GIETERIJ price

HITTECH GIETERIJ 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 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.

HITTECH GIETERIJ 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, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. 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).

HITTECH GIETERIJ sensor principle

The essence of a grating displacement sensor is to perform measurement by using the grating pitch as a standard ruler. High-resolution grating scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly use 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 move up and down accordingly. This converts the measurement of the grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at certain intervals enables electronic subdivision and direction determination functions. For example, for a grating scale with 50 line pairs/mm, the 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; therefore, 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 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 phases of the square waves, the movement direction of the grating scale can be determined. By counting the square wave pulses, the displacement and speed of the grating scale can be obtained.

HITTECH GIETERIJ sensor usage precautions

When plugging or unplugging the connector of the linear encoder sensor and the digital display unit, ensure the power is turned off. Install an external protective cover whenever possible, and promptly clean 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 screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, uniform layer of silicone oil to the strip, taking care not to splash it onto the glass grating ruling surface. To ensure the reliability of the linear encoder sensor, clean and wipe the linear encoder 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 linear encoder; if the linear encoder breaks, the sensor will fail. Do not disassemble the linear encoder sensor yourself, and never arbitrarily change the relative gap between the main grating scale and the secondary grating scale. Otherwise, this may compromise the accuracy of the linear encoder sensor and cause relative friction between the main and secondary grating scales, damaging the chrome layer and thus the grating lines, resulting in scrapping of the linear encoder. Take care to prevent oil stains and water from contaminating the linear encoder scale surface, as this may 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 grating chrome layer and the linear encoder scale surface, which would degrade the quality of the linear encoder.

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