Wireless flowmeter | Instructions for using wireless remote flowmeter

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1. How to use wireless flow meters and thermocouples in series

In special cases, thermocouples can be connected in series or parallel, but only multiple thermocouples made of the same material are allowed, and their cold ends should be at the same temperature. The main uses are as follows: (1) Series connection with the same polarity, aiming to enhance the signal. For example, in a radiation pyrometer. Multiple thermocouples are connected in series, with the hot end at the same temperature t and the hot and cold ends at t0. The total thermoelectric potential is many times that of a single thermocouple. (2) Same polarity series connection is used to measure the average temperature of multiple measuring points. For example, in the combustion chamber of a jet engine, the signals from multiple measuring points are connected in series to strengthen the signal. However, the electromotive force of each thermocouple may not be equal, and the total thermoelectric potential reflects the average temperature. (3) Reverse polarity series connection is used to measure temperature difference. For example, the air conditioning system uses the temperature of a certain measuring point as the standard, while other measuring points reflect the air conditioning effect based on temperature differences. For example, the heating capacity of hot water is obtained by multiplying the flow rate and temperature difference. (4) Two thermocouples with unequal time constants are connected in series in reverse polarity to measure the rate of temperature change. When the temperature remains constant, the total thermoelectric potential is zero, and the faster the change, the larger the output signal, which is very useful in the heat treatment p

rocess of precision metal parts. (5) Parallel connection with the same polarity is also used to measure the average temperature But it is required that the resistance and time constant of each thermocouple should also be equal. It should be noted that thermocouples with short circuits or open circuits are not allowed in series or parallel Otherwise, it will cause serious errors. In the use of a single thermocouple, short circuits or open circuits can cause the signal to completely disappear, making it relatively easy to detect. In the case of multiple thermocouples connected in series or parallel, local short circuits or open circuits may not necessarily cause the total output potential to disappear, making it difficult to attract attention. 5. Key points for use: (1) Thermocouple conductor tracing and sleeve heat transfer may cause temperature measurement errors. To reduce this impact, attention should be paid to the insertion depth of the thermocouple into the measured medium. (2) The instrument that matches the thermocouple must have high input impedance to ensure that no current is drawn from the thermocouple, otherwise the measured voltage is the terminal voltage rather than the electromotive force. It is best to use a DC potentiometer or a circuit composed of components such as field-effect transistors and operational amplifiers in conjunction with thermocouples. (3) Attention should be paid to errors caused by parasitic electromotive force. Because the thermoelectric potential is very small, if there is a contact electromotive force due to different metal materials in the wires, terminals, switches, etc., or if there is a thermoelectric potential due to uneven temperature distribution, it will affect the measureme

Wireless flowmeter | Instructions for using wireless remote flowmeter

1. How to use wireless flow meters and thermocouples in series

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