Four-in-one gas detector fault detection
The 4-in-1 gas detector is a single gas or multi-gas detector that can be flexibly configured with an oxygen sensor, a combustible gas sensor, a toxic gas sensor or a choice of four gas sensors or a choice of single gas sensors. The 4-in-1 gas detector has a very clear large LCD display, backlight illumination, sound and light vibration alarms to ensure that in a very unfavourable working environment can also detect dangerous gases and prompt the operator to prevent.
Four-in-one gas detector detection part of the principle is that when the measured flammable gas concentration exceeds the limit value, after amplification of the bridge output voltage and circuit detection of the set voltage, through the voltage comparator, square wave generator outputs a set of square wave signals to control the sound, light detection circuit, the buzzer occurs continuously sound, light-emitting diode flashes to send out a detection signal. From the four-in-one gas detector principle can be seen if there is electromagnetic interference will affect the detection of the signal, data bias; if there is a collision, vibration and thus cause the equipment circuit breakage will now detect failure; if the environment is too humid or equipment into the water, it may also cause the four-in-one gas detector short-circuit, or the line resistance value changes, detection failure.
Formaldehyde is a colourless and soluble irritant gas. Particleboard, density board, plywood and other man-made panels, adhesives and wallpaper is the main source of formaldehyde in the air, the release period of up to 3 to 15 years. Can be absorbed by the respiratory tract, formaldehyde harm to the human body with long-term, latent, hidden characteristics. Long-term inhalation of formaldehyde can cause nasopharyngeal cancer, throat cancer and other serious.
For example: formaldehyde and paper with the test drug contained in the paper will react with formaldehyde to generate compounds, the colour will change from white to yellow. The degree of colour change reflects the amount of reflected light. The rate of change in the intensity of the reflected light can be used as a response to the gas concentration. The gas concentration can be determined by the response value of the gas to be detected by setting the detection line in advance.
The 4-in-1 gas detector consists of two parts, detection and detection, and has both detection and detection functions. Four-in-one gas detector detection part of the principle is the instrument's sensor using the detection element and fixed resistance and zero potentiometer constitutes the detection of the bridge. Bridge to the platinum wire as a carrier catalytic element, the platinum wire temperature rises to the working temperature after the power supply, the air to natural diffusion or other ways to reach the surface of the element. When there is no combustible gas in the air, the output of the bridge is zero, when the air contains combustible gases and diffuse to the detection element, due to the catalytic effect of flameless combustion, so that the temperature of the detection element rises, the platinum wire resistance increases, so that the bridge is out of balance, so that there is a voltage signal output, the size of this voltage and the concentration of combustible gases is directly proportional to the signal amplified, the analogue-to-digital converter, through the liquid display to show the The signal is amplified and converted to analogue-digital, and the concentration of combustible gas is displayed through the liquid display.
