Bus system usually consists of two to four wire circuits, a bus all detector and on the back, has its own independent address code, each detector controller according to the different address signal access each detector.....
Line between each detector system and controller have independent signal circuit, all is parallel to the input signal to the controller, this method is also called the point-to-point connections. Wire systems and the signal transmission reliable, relatively independent between detector, any run a loop is not affected by other circuit fault, and the power configuration is simple, there is no strict limit, the single wire systems and wiring is relatively complex, especially in the detector or spacing between the det.......
Gas detector calibration is to use a known concentration of the standard gas of zero and range of the detector for approval process. The zero calibration gases are generally use pure nitrogen or clean air. Calibration range depending on the gas under test, choose a known standard gas composition and concentration.....
Zero drift is a detector use after a period of time, due to the influence of environment temperature and humidity, zero drift, appear clean air readings is greater than or less than zero phenomenon.
FS is full range (full scale) acronym, it said the size of the measurement range. For example, combustible detector (range of 0-100% LEL) the precision of the < < plus or minus 3% FS, equivalent to the precision of + / - 3% LEL.
The response time of the gas detector (t90) usually refers to the response value to gas concentration detector when 90% of the time it takes for the real values.
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