Device for detecting oxygen concentration

Abstract

The invention discloses a device for detecting an oxygen concentration, and relates to the gas concentration detection technology field. The device comprises a detection circuit board. A detection channel is arranged in the detection circuit board. The detection circuit board is detachably connected with the detection circuit board. Sealing layers are arranged at two ends of the detection channel respectively. Supersonic wave transmit-receive sensors are arranged at two sides of the detection circuit board respectively. The probes of the supersonic wave transmit-receive sensors are sealed by the sealing layers at two ends of the detection channels respectively. A gas sample channel is arranged above the detection channel. The gas sample channel is parallel to the detection circuit board and is arranged crossed with the detection channel. One end of the gas sample channel is equipped with a gas inlet, and the other end of the gas sample channel is equipped with a gas outlet. A diffusion channel is arranged between the gas sample channel and the detection channel. The structure is simple and reasonable, measuring is accurate, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of gas concentration detection, in particular to a device for detecting oxygen concentration. Background technique [0002] The device for detecting oxygen concentration in the prior art uses ultrasonic technology to measure the oxygen ratio in nitrogen-oxygen mixed gas. During the multiple sampling process of the sensor of this device, due to changes in the flowing gas, the sampling data fluctuates greatly and the consistency is poor. In addition, the inlet and outlet ends of the sample gas channel form a certain angle with the detection channel, so that in the entire detection channel, the airflow velocity and flow direction at both ends are inconsistent with the flow velocity and flow direction of the airflow in the entire detection channel, which increases the measurement error. If the influence of airflow fluctuations at the end is affected, a longer detection channel is required to meet the measurement...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a device for detecting oxygen concentration, so as to solve the problem in the prior art that during the sampling process, due to the change of the flowing gas, the sampling data changes greatly and the consistency is poor. The influence brought by it requires a long detection channel to meet the measurement requirements, which leads to the increase of cost and many other defects mentioned above.

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