Fault Generation of Combustible Gas Detector
The combustible gas detector consists of two parts: detection and detection, and has detection and detection functions. The principle of the detection part of the flammable gas detector is that the sensor of the instrument uses a detection element, a fixed resistor and a zero potentiometer to form a detection bridge. The bridge uses platinum wire as the carrier catalytic element. After electrification, the temperature of the platinum wire rises to the working temperature, and the air reaches the surface of the element by natural diffusion or other methods. When there is no flammable gas in the air, the output of the bridge is zero. When the air contains flammable gas and diffuses to the detection element, flameless combustion occurs due to catalytic action, which makes the temperature of the detection element rise and the resistance of the platinum wire increases. , so that the bridge is out of balance, so that there is a voltage signal output, the magnitude of this voltage is proportional to the concentration of flammable gas, the signal is amplified, converted from analog to digital, and the concentration of flammable gas is displayed through the liquid display.
The principle of the detection part is that when the concentration of the measured flammable gas exceeds the limit value, the amplified bridge output voltage and the circuit detection set voltage, through the voltage comparator, the square wave generator outputs a set of square wave signals, control sound, In the light detection circuit, the buzzer produces continuous sound, and the light-emitting diode flashes to send out a detection signal. From the principle of the flammable gas detector, it can be seen that if there is electromagnetic interference, the detection signal will be affected, and data deviation will occur; if there is a collision or vibration that causes the equipment to break, the detection will fail; if the environment is too humid or the equipment enters water, it may also be damaged. Cause a short circuit in the flammable gas detector, or a change in the line resistance value, resulting in a detection failure.
