Two-wire toxic gas detector with digital display function

Abstract

The invention belongs to the technical field of gas detection and particularly relates to a two-wire toxic gas detector with a digital display function. The two-wire toxic gas detector comprises a toxic gas sensing circuit, an AD acquisition and processing circuit, a main chip control circuit, a display circuit, an infrared button circuit, a 4-20 mA output control circuit and a power circuit, wherein after gas concentration detected by the toxic gas sensing circuit is converted into voltage signals and the voltage signals are sent to the AD acquisition and processing circuit for amplification processing, the main chip control circuit accesses the AD acquisition and processing circuit, controls the display circuit for display, judgment and alarm processing, controls the infrared button circuit to perform zero adjustment calibration and controls accurate output of the 4-20 mA output control circuit through a PWM (pulse width modulation) output. The two-wire toxic gas detector can realize two-wire toxic gas detection, and data uploading is facilitated by the 4-20 mA output control circuit; digital display and infrared remote control are realized, and toxic gas detection is intelligent and modular.

Description

technical field [0001] The invention belongs to the technical field of gas detection, in particular to a two-line toxic gas detector with a digital display function. Background technique [0002] Carbon monoxide, hydrogen sulfide, ammonia, chlorine and other toxic gases are produced in many production and living environments, which seriously threaten human life and property safety. Toxic gas detectors can detect certain toxic gases in the environment in time and display them in real time. Gas concentration can be monitored in time by uploading an alarm to ensure safety. Traditional two-wire toxic gas detectors often cannot achieve low power consumption, real-time display, and inconvenient operation, which is not conducive to production debugging and accurate calibration, and is not conducive to the modularization of toxic gas sensing circuits. The invention adopts low power consumption, current loop, and infrared remote control button to realize a two-wire 4-20mA toxic gas ...

AI Technical Summary

Problems solved by technology

Traditional two-wire toxic gas detectors often cannot achieve low power consumption, real-time display, and inconvenient operation, which is not conducive to production debugging and accurate calibration, and is not conducive to the modularization of toxic gas sensing circuits

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