A few factors affecting the use of gas detectors
First, pay attention to a variety of different sensors between the detection of interference
Generally speaking, each sensor corresponds to a specific detection gas, but any kind of gas detector can not be special effects. Therefore, in the selection of a gas sensor, should be as much as possible to understand the other gases on the detection of the sensor interference, in order to ensure that it for the accurate detection of specific gases.
Two
Toxic and hazardous gas detector is also the same as other analytical instruments, are relatively comparative method for determination: first of all, a zero gas and a standard concentration of gas calibration of the instrument to get the standard curve is stored in the instrument, measurement, the instrument will be measured gas concentration generated by the electrical signal with the standard concentration of electrical signals to compare, calculated to get the accurate value of the gas concentration. Therefore, zeroing the instrument at any time and calibrating the instrument regularly are indispensable to ensure the accuracy of the measurement. It is important to note that many gas detectors are now available with interchangeable sensors, but this does not mean that a detector can be fitted with a different detector probe at any time. Whenever a probe is changed, the instrument must be recalibrated in addition to the sensor activation time. In addition, it is recommended that all types of instruments in use before the instrument with the standard gas response test to ensure that the instrument really play a protective role!
Third, pay attention to all kinds of sensor life
Various types of gas sensors have a certain period of use, that is, life. Generally speaking, in the portable instrument, LEL sensor life is longer, generally can be used for about three years; photoionisation detector life for four years or longer; electrochemical specific gas sensor life is relatively short, generally in one year to two years; oxygen sensor life is the shortest, probably in a year or so. The life of electrochemical sensors depends on the drying out of the electrolyte in them, so if they are not used for a long period of time, sealing them and placing them in a lower temperature environment can extend their life by a certain amount. Therefore, the sensor should be tested at any time, as far as possible in the sensor's validity period, once the failure, timely replacement.
Fourth, pay attention to the concentration measurement range of the detection instrument.
Various types of toxic and hazardous gas detectors have their fixed detection range. Only in its measurement range to complete the measurement, in order to ensure that the instrument accurately measured. And a long time beyond the measurement range for measurement, it may cause sexual damage to the sensor. For example, LEL detectors, if inadvertently used in an environment exceeding 100% LEL, may completely burn out the sensor. And toxic gas detectors, working for a long time in higher concentrations to use will also cause damage. Therefore, if a fixed instrument sends out an over-limit signal when in use, it is important to shut down the measurement circuit immediately to ensure the safety of the sensor.
At present, the detectors available to us include fixed/portable, diffusion/pump suction, single gas/multi-gas, inorganic gas/organic gas, and many other combinations. Only by choosing the right gas detection instrument can we really do more with less and prevent problems before they occur.
