German Bijur Delimon sensors, Bijur Delimon models, Bijur Delimon prices

Bijur Delimon sensors are used to detect angles. There is a hole in the body that fits LEGO axles. When connected to RCX, the angle sensor counts once for every 1/16 turn of the axle. When rotating in one direction, the count increases; when the direction changes, the count decreases. The count depends on the initial position of the angle sensor. When initializing the angle sensor, its count value is set to 0. If needed, you can reset it via programming.

Bijur Delimon sensor classification

1) Contact type: The sensing part of contact temperature sensors has good contact with the object being measured, also known as thermometers. Thermometers reach thermal equilibrium through conduction or convection, allowing the reading to directly indicate the temperature of the object. Generally, measurement accuracy is high. Within a certain temperature range, thermometers can also measure internal temperature distribution. However, significant measurement errors occur with moving objects, small targets, or objects with low heat capacity. Common thermometers include bimetallic thermometers, glass liquid thermometers, pressure thermometers, resistance thermometers, thermistors, and thermocouples. They are widely used in industry, agriculture, commerce, and daily life. With the extensive application of cryogenic technology in national defense, aerospace, metallurgy, electronics, food, pharmaceuticals, petrochemicals, and superconductivity research, cryogenic thermometers for measuring temperatures below 120K have been developed, such as low-temperature gas thermometers, vapor pressure thermometers, acoustic thermometers, paramagnetic salt thermometers, quantum thermometers, cryogenic resistance thermometers, and cryogenic thermocouples. Cryogenic thermometers require small sensing elements, high accuracy, good reproducibility, and stability. Carburized glass resistance thermometers, made from porous high-silica glass impregnated with carbon and sintered, are one type of sensing element for cryogenic thermometers, suitable for measuring temperatures in the range of 1.6 to 300K. 2) Non-contact type: The sensing element does not touch the object, also known as non-contact temperature measuring instruments. These instruments measure surface temperatures of moving objects, small targets, objects with low heat capacity, or those with rapid temperature changes (transients), and can also measure temperature field distributions. The most common non-contact instruments are based on blackbody radiation laws, called radiation thermometers. Radiation thermometry includes brightness methods (see optical pyrometers), radiation methods (see radiation pyrometers), and colorimetric methods (see colorimetric thermometers). Various radiation methods only measure corresponding brightness temperature, radiation temperature, or colorimetric temperature. Only measurements on blackbodies (objects that absorb all radiation and reflect no light) yield true temperature. To determine true temperature, material surface emissivity must be corrected. Surface emissivity depends on temperature, wavelength, surface condition, coatings, and microstructure, making precise measurement difficult. In automated production, radiation thermometry is often used to measure or control surface temperatures, such as steel strip rolling temperature, roll temperature, forging temperature, and molten metal temperature in furnaces or crucibles. In these cases, measuring surface emissivity is challenging. For automatic measurement and control of solid surface temperatures, additional mirrors can form a blackbody cavity with the surface. Additional radiation increases effective radiation and effective emissivity. Using effective emissivity, the instrument corrects the measured temperature to obtain the true surface temperature. A typical additional mirror is a hemispherical mirror. Diffuse radiation from the surface near the sphere's center is reflected back by the hemisphere, increasing effective emissivity, where ε is material surface emissivity and ρ is mirror reflectivity. For gases and liquids, inserting a heat-resistant tube to a certain depth forms a blackbody cavity. The effective emissivity of the cylindrical cavity at thermal equilibrium is calculated. This value corrects the cavity bottom temperature (medium temperature) to obtain the true medium temperature.

Bijur Delimon sensor usage precautions

1) Errors introduced by improper installation: For example, thermocouple placement and insertion depth may not reflect the true furnace temperature. Thermocouples should not be installed too close to doors or heating elements; insertion depth should be at least 8 to 10 times the protection tube diameter. Gaps between the thermocouple protection tube and wall must be filled with insulating material (e.g., refractory clay or asbestos rope) to prevent heat loss or cold air ingress, which affects accuracy via convection. The cold junction should not be too close to the furnace body to avoid exceeding 100℃. Install thermocouples away from strong magnetic and electric fields; do not run thermocouples and power cables in the same conduit to avoid interference. Do not install in areas with little media flow. When measuring gas temperature in pipes, install the thermocouple against the flow direction to ensure full contact. 2) Errors due to degraded insulation: Poor insulation between thermocouple poles and the furnace wall, caused by dirt or salt deposits on protection tubes and terminal blocks, worsens at high temperatures. This causes thermoelectric potential loss and interference, leading to errors up to hundreds of degrees. 3) Errors due to thermal inertia: Thermal inertia causes instrument readings to lag behind temperature changes, especially during fast measurements. Use thermocouples with thin electrodes and small-diameter protection tubes. If permitted, remove the protection tube. Due to measurement lag, detected temperature fluctuation amplitude is smaller than actual furnace temperature fluctuations. Larger lag results in smaller amplitude and greater deviation from actual temperature. When using thermocouples with large time constants, displayed temperature fluctuations may be small while actual fluctuations are large. For accurate measurement, choose thermocouples with small time constants. Time constant is inversely proportional to heat transfer coefficient and directly proportional to hot junction diameter, material density, and specific heat. To reduce time constant, minimize hot junction size. Use materials with good thermal conductivity, thin-walled tubes, and small inner diameters. For precise measurements, use bare-wire thermocouples without protection tubes, but replace them promptly if damaged and calibrate regularly. 4) Thermal resistance errors: At high temperatures, ash or dust on protection tubes increases thermal resistance, hindering heat conduction and causing readings to be lower than true temperature. Keep protection tubes clean to minimize errors.

Bijur Delimon sensor industry applications

Temperature sensors were the earliest developed and most widely used sensor type, holding a market share far exceeding other sensors. Temperature measurement began in the early 17 century. Supported by semiconductor technology, semiconductor thermocouple sensors, PN junction temperature sensors, and integrated temperature sensors were subsequently developed. When two different conductors are joined at a point and heated, a potential difference appears at the unheated ends. This potential difference relates to the temperature at the unheated measurement point and the conductor materials. This phenomenon occurs over a wide temperature range. By precisely measuring this potential difference and the ambient temperature at the unheated end, the heated point's temperature can be accurately determined. Because two different conductors are required, it is called a 'thermocouple.' Thermocouples made of different materials suit different temperature ranges and have varying sensitivities. Thermocouple sensors have advantages and disadvantages: low sensitivity, susceptibility to environmental interference and preamplifier temperature drift, making them unsuitable for measuring minute temperature changes. Thermocouple sensitivity is independent of material thickness.

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