The correct way of using the combustible gas detector
In accordance with the requirements of verification regulation of combustible gas alarm is strict verification environment, because it is an electronic instrument, mainly from the verification of the error verification environment, not only requires a certain environment temperature and humidity, also require ventilation is good, no interference components to be tested. This is because: first, because the environment closed anoxia, cause gas burning surface cannot complete combustion, heat change with the combustion element resistance;Second, because access to the flammability of high concentrations of toxic or harmful gases and oxygen, combustion can't completely, so can't detect the gas concentration;Third, due to the concentration of harmful gas in the environment, although can complete combustion, but due to their concentration is higher than the instrument measuring range, thus reaction components after high concentration gas shock, after a period of time, the sensitivity was increased, will greatly affect the correctness of the test.
The specific identification of steps:
(1) appearance and electricity check: for use in the combustible gas detection alarm system has the different situation, should be inspected according to the relevant requirements.
(2) the verification of error value: having to stable electricity preheating apparatus to check, because, in some sensors to after a certain time after turning on the power supply of the preheating will stabilize, display pointer during this period may have some swing, this is just a state of transition, not detector failure, thus ensure enough time preheating stability is also important measures to ensure reliable basic error;At the same time should be put the instrument calibration error value for full scale calibration, also can achieve the purpose of the standard gas saving.
Calibration of error of steps as follows:
First, first of all, according to the specification requirements of the gas flow ventilation with zero alignment zero, the zero point, the power supply voltage should be meet the power supplying requirement of instrument rules, so that bring up the electrical zero is stable.
In a second, adjust the calibration value, with a standard gas during verification, for different instruments, through the regulation of the different potentiometer on the instrument to achieve an accurate calibration value, some indicator scale adjustment is likely to be repeated two or three times.
Third, in accordance with the requirements of verification regulation, respectively into the concentration of about 10% LEL, 40% LEL, 60% LEL of standard gases, recording instrument is stable in value, according to the calculation results take absolute value of the largest for error value.
Fourth, when the test to get a stable test data, for the instrument calibration should be low concentration gas is piped in, gradually to the high concentration of gas.
Fifth, to the standards of different concentration of gas in the test of ventilation flow stability, uniform, can achieve accurate and reliable calibration value.
(3) the repeatability of the test: because the repeatability is after the verification of error value to do, so you can't simply bring data of error, but want to do again, it is concluded that value.
Under normal working conditions, ventilation with zero calibration gas zero, then pass into the standard gas concentration is about 40% LEL, recording instrument is stable in value, and according to the rules to do 6 times
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