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How to detect the quality and stability of the thermocouple
2013-12-12 Reads : 41
First thermocouple burnout detection methods, how to detect a thermocouple is good or bad? How can I quickly determined? There are several ways? Thermocouple measured with a multimeter when specific practices can be said clearly? For example: What is the general good thermocouple Europe? If it is bad, it would be what? First determine the appearance of the thermocouple is no problem, good or bad, was determined by detecting ability. If the microcontroller that supports input impedance), then a pull-up resistor can be used to control the IO. Detect when to pull the IO does not detect when, IO significantly high impedance to detect temperature value overrange warned might happen burnout , that if the room temperature it? Disconnect the return value of AD + AD when the difference should be 0, before being broken only mV level signals (can be approximated as a short circuit), burnout, then there is a pull-up or a constant current source, is a large signal. Of course we can pull together to solve the problem, do not pull on it, detected temperature value will be measured over a range impractical to wear special ceramic casing, and put together a standard platinum and rhodium tube furnace, the hot end into soaking cylinder with a nickel-metal tube furnace in a porous made of. The cold end of the wire into the respective compensation ice-water mixture held by the container zero degrees Celsius. Thermocouple thermoelectric effect is the application of the principle of common tools to detect temperature. In conventional instruments, in order to solve the problem of cold junction compensation and linearity issues thermocouple must take some measures, the creation of some additional equipment in order to get more accurate detection value would tube furnace maintained at the maximum allowable temperature, and stably maintain this range. After this time tested and benefits with Bosideng potential difference, measured and tested standard thermoelectric potential difference generated and recorded. According to records of the thermoelectric potential difference, look-up table to detect their corresponding temperature, if measured tolerance can be determined to be ineligible. This tube furnace, not the analysis of silicon carbide tube furnace chemical use. For unqualified, can be cut off from the hot end of a short, re-welded. Welding method is very simple, ordinary nickel-chromium, can be adjusted to a lower voltage autotransformer with a two wire and into a pole, the other pole with a carbon rod, direct ignition of the arc, two wires in the head the melt into a small ball. This operation is not difficult, you can adjust the voltage, will soon grasp. This welding using autotransformer, careful insulation to ensure safety. On the precious platinum and rhodium welding, is another method. After a power surge pole insertion aqueous sodium chloride solution, the other pole is screwed together, living with insulating clamp, tap the surface of the solution, the ends can fuse. Both welding, pay attention to safety and training, easy to grasp. Re-welding, you can then test to determine whether or not qualified. For instance, VCC-resistance thermocouple connected to this is certainly not a normal intermediate voltage VCC when the middle after burnout becomes a VCC. Method will affect the thermocouple voltage performance, right? Burnout detection? Refers to the thermocouple disconnected it? Thermocouple burnout detection is the disconnected state, we are using a B-type platinum and rhodium wire, with voltage detection method, then, fear an impact on the performance of platinum and rhodium wire, platinum and rhodium wire to get into too many processes can be used for precise measurements temperature. I do not know how you are connected to the thermocouple circuit, we buy thermocouple acquisition module, rhodium, platinum wire is directly connected to the two ends of the module + signal input, that is not clear is how this acquisition module carried burnout detection. General AD has an ultra-low current internal current source can be burnout detection without affecting the performance of small constant current sources say several hundred nA of thermocouples.
keywords: Thermocouple,
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You are the 10689 visitor
Copyright © GuangDong ICP No. 10089450, The Huai'an Dwyer Instrument Co., Ltd. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility