Precautions for using two-wire sensor

1. Power supply protection Reverse connection of power supply, overvoltage and surge are common power supply problems in the industry. Reverse power connection is the most likely error when installing and wiring the equipment. A diode in series at the input port can prevent damage to the circuit when the power supply is reversed. If a full-bridge rectifier is added to the input, it can work normally even if the power supply is reversed. In order to prevent the transmitter from being damaged by energy such as lightning strike, electrostatic discharge, and surge, a TVS tube can be installed at the entrance of the transmitter to absorb the energy of instantaneous overvoltage. Generally, the TVS voltage value is slightly lower than the limit voltage of the op amp to play a protective role. If it may be struck by lightning, the TVS may not absorb enough capacity, and the varistor is also necessary, but the leakage of the varistor itself will bring certain errors. 2. Errors such as sensor disconnection and short circuit may occur during the operation of the overcurrent protection device. Or the input quantity itself is likely to exceed the range, and the transmitter must ensure that the output will not rise unlimitedly under any circumstances, otherwise it may damage the transmitter itself, the power supply, or the remote display instrument. Wide voltage adaptability. Generally, two-wire transmitters can adapt to a wide range of voltage changes without affecting accuracy. In this way, it can be applied to various types of power supplies, and at the same time, it can adapt to large load resistances. The most sensitive part to the power supply is the reference source, and the reference source is also the main component that determines the accuracy. 3. Decoupling capacitors In general circuit design, there will be decoupling capacitors at the power supply end of each integrated circuit. When the two-wire transmitter is powered on, the charging of these capacitors will instantly lead to a large current, which may damage the remote instrument. Therefore, each decoupling capacitor generally does not exceed 10nF, and the total decoupling capacitor should not exceed 50nF. A 10nF capacitor at the entrance is necessary to ensure that the circuit does not oscillate under long-line inductive loads.

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