Circuit of electrochemical sensor, and method and device

Abstract

The invention relates to a circuit for an electrochemical sensor and a usage method for the circuit. The circuit includes an electrochemical sensor, a control circuit and a measurement circuit, and a changeover switch is arranged between the control circuit and the measurement circuit. The control circuit provides a bias voltage for electrodes of the electrochemical sensor, is a low-power-consumption circuit, and includes a low-power-consumption operational amplifier. The measurement circuit includes a low-noise and high-precision operational amplifier, and is used to detect signals when the electrochemical sensor is in operation. When the electrochemical sensor is not in operation, the stability of the sensor can be maintained, and the problems that batteries are replaced frequently due to excessively fast power consumption and a long stabilization time is required by the sensor after the batteries are replaced can also be avoided; and when the electrochemical sensor is in operation, low noise and high precision of a measurement result are guaranteed. The circuit has low power consumption and high detection precision, and can be applied to detection, performed by means of the electrochemical sensor, of a gas concentration such as a nitric oxide concentration in expiratory gas.

CPC Classifications