The difference between dual thermocouple and multi-point thermocouple
The difference between dual thermocouple and multi-point thermocouple? Is dual thermocouple with two pairs of wires in one protection tube? It is still like multiple thermocouples with multiple protection tubes. Do multiple thermocouples have multiple signal outputs? 1. The dual-branch thermocouple is to install two pairs of electrodes in a protective tube, measure the temperature of the same measuring point, and then transmit the measured data to the temperature control system and display and recording equipment. When the computer was not developed before, Meet the requirements of multiple devices to enjoy the same data. At the same time, the general key temperature measurement points, the easily damaged temperature measurement points, and the temperature measurement points for interlocking control use double armored thermocouples. To ensure the accuracy of temperature measurement, it can also prevent the trouble of re-disassembly after a damaged one. 2. Multiple thermocouples are generally used in chemical synthesis towers or oil refining equipment to measure the temperature of each area between a measuring point that extends longitudinally over a span of tens of meters. A shared negative electrode is used, and there can be a maximum of 6 positive electrodes. Weld a positive electrode at every interval on the negative electrode. In some high-pressure pipelines, the process requires as few openings as possible. We use a double-branch thermocouple. There are two measuring elements in a casing, and then two independent signals are sent to the DCS and ESD systems. However, this situation is quite special. Under normal circumstances, we will still use two single-brackets to send the signal to the two systems respectively. The multi-branch type also has some contact, such as the detection of the temperature of the catalyst layer in the synthesis tower. The synthesis tower supplier will provide two cylindrical thermocouple bundles with the tower. Each bundle has multiple detection elements. The transmitter sends the temperature signal of each point to the DCS.
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