Analysis of fault detection of four-in-one gas detector

The 4-in-1 Gas Detector is a single gas or multiple gas detectors that can be equipped with sensitive sensors. It can be equipped with an oxygen sensor, a flammable gas sensor, and a toxic gas sensor or any four gas sensors or an optional single gas. The sensor. The four-in-one gas detector has a very clear large liquid crystal display, backlighting, sound and light oscillation alarm prompts, ensuring that dangerous gases can be detected in a very sturdy working environment and promptly alert the operator.

The principle of the exploration part of the four-in-one gas detector is that when the measured flammable gas concentration exceeds the limit value, the expanded bridge output voltage and the circuit exploration set voltage pass through the voltage comparator, and the square wave episode outputs a set of squares. The wave signal, the control sound, the light exploration circuit, the buzzer sounds successively, the LED flashes, and the exploration signal is emitted. From the principle of the four-in-one gas detector, it can be seen that if the electromagnetic interference will affect the signal of the exploration, the data will be biased; if there is a bump and vibration, then the equipment will be broken and the exploration will fail; if the environment is too humid or the equipment is flooded, it is possible Will cause the four-in-one gas detector to appear short circuit, or the line resistance value changes, showing exploration problems.

Formaldehyde is a colorless, easily soluble, irritating gas. Artificial boards, adhesives and wallpapers such as particleboard, MDF and plywood are the main sources of formaldehyde in the air, with a release period of 3 to 15 years. It can be absorbed through the respiratory tract, and the harm of formaldehyde to the human body is characterized by long-term, latent and concealed characteristics. Long-term inhalation of formaldehyde can cause serious diseases such as nasopharyngeal cancer and throat cancer.

For example, if the formaldehyde is the same as the paper, the reagent contained in the paper will react with formaldehyde to form a compound, and the color will change from white to yellow. The degree of discoloration reflects the amount of reflected light of the received light. The intensity change rate of the amount of reflected light can be handled as a gas concentration. By setting the calibration curve in advance, the concentration of the gas can be determined by detecting the response value of the target gas.

The four-in-one gas detector consists of two parts: detection and exploration, with detection and exploration functions. The principle of the detection part of the four-in-one gas detector is that the sensor of the instrument selects the detecting component and the fixed resistor and the zero-setting potentiometer constitute a detecting bridge. The bridge wire uses platinum wire as the carrier catalytic element. After the power is applied, the platinum wire temperature rises to the working temperature, and the air reaches the component appearance by natural dispersion method or other methods. When there is no flammable gas in the air, the bridge output is zero. When the air contains flammable gas and is dispersed on the detecting element, the flame is incinerated due to the catalysis, the temperature of the detecting element is increased, and the platinum wire resistance is increased. The bridge is out of balance, and then there is a voltage signal output. The magnitude of this voltage is proportional to the concentration of the flammable gas. The signal is amplified, analog-digital converted, and the concentration of the flammable gas is displayed through the liquid display.

Leave a reply:

Your email address will not be published.

Site Footer