The temperature transmitter consists of a measuring unit and an amplifying unit. The range step element is composed of a circuit board composed of an input circuit and a feedback circuit. The range unit is different depending on the input signal. There are three range units that match the three input modes of DC millivolt, thermocouple and RTD, and the amplification unit is common to the three inputs.
The DC millivolt signal can be provided by any sensor or sensitive component. The DC millivolt range unit is relatively simple. Before the DC millivolt signal is amplified 5 times, there is a tuning circuit so that when the input signal Ui=0, the output signal Uo=1v ( In order to meet this requirement, a feedback circuit is also designed to satisfy the requirement that the output voltage Uo has a certain relationship with the feedback voltage Uf: Uo=5Uf. It is necessary to repeatedly adjust the zeroing potentiometer W1 and the feedback potentiometer Wf to achieve the accuracy requirement.
The thermoelectric range unit must have cold junction compensation and linearization. The bridge method for cold junction compensation is basically the same as the foregoing. The linearization function is because the relationship between thermoelectric potential and temperature is nonlinear. A negative feedback circuit is designed to have a polygonal line characteristic. The slope of each segment is different, but it can be approximated as a curve, so that the closed-loop amplification factor is related to the input thermoelectric potential. The size of the curve changes, which essentially offsets the nonlinearity of the thermocouple, and the output voltage is substantially proportional to temperature.
The thermal resistance range unit introduces a thermal resistor in a two-wire system. For the platinum resistance, the resistance-temperature curve is a monotone convex curve, and the resistance increment increases with the increase of the temperature. A positive feedback circuit is designed, so that the output signal grows with the increase of the input resistance value. Significantly, the output electrical specific resistance curve is a concave curve, thereby achieving a linearization function. The copper resistor itself has good linearity and does not require a linear ratio.
The amplifying unit uses the basic circuit of an integrated operational amplifier plus a power amplifier.
When the above temperature transmitter measures DC millivolts, the range is 3-100mv, the zero migration is -50-50mv; the range matched with the thermocouple is 3-60mV; and the range with the platinum thermal resistance is -100-500°C. The accuracy levels are all 0.5.
Industrial Cable Assembly mainly includes some electronic wires, multi-core wires, flat wires, etc. with components in the cabinet, and are mostly used in industrial UPS, PLC, CP, inverter, monitoring, air conditioning, wind energy and other cabinets. The demand for industrial cable assembly in the industrial field is increasing, and the requirements for quality are becoming more and more stringent.
Industrial cable assembly is currently the most diverse category of wiring harnesses, with many subdivided products (sensor & industrial control system; network communication, temperature control and air conditioning, air conditioning system, LED and lighting, rail transit, ship and marine engineering, renewable new energy , measuring and testing equipment, packaging and logistics transmission), covering the most types, there are not too many requirements for certification and scale, but entrepreneurs need to understand the attributes of this industry, mostly small and diverse, and there are There are many demand for brand materials, and there are many choices for the supply chain, especially the selection part of the Connector , which requires a lot of brands and types.
The main test of industrial cable assembly is that there are a lot of components and their origins are all over the world. It is necessary to coordinate the delivery of various materials to meet the delivery time of wiring harness products. The factory's supply chain management capabilities are very strict, especially now due to the epidemic, The global supply chain is fluctuating, chip shortages, and raw material prices have risen again and again (when will the price of molex, JST, TE brand connectors stop! The localization of connectors will be accelerated!), and then domestic power cuts, and the epidemic has repeated. The postgraduate entrance examination for industrial product wiring harness companies is very large, and industrial cable assembly companies currently have a large number of companies in mainland China. Kable-x has been established for more than 10 years. We have been committed to customizing high-quality high-end wiring harnesses for our customers for many years. Our industrial wiring harness has always been one of our key development areas, such as Laser Welding Equipment Wiring Harness and BMS Acquisition Wire Harness . In addition to the industrial field, we also provide Medical Cable Assembly and Vehicle Cable Assembly for many well-known medical equipment companies.
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