Problems to be aware of when using gas detectors
) Pay attention to regular calibration and testing.
Toxic and hazardous gas detection instrument is also the same as other analytical instruments, are measured by the method of relative comparison: first of all, a zero gas and a standard concentration of gas to calibrate the instrument to get the standard curve stored in the instrument, measurement, the instrument will be measured gas concentration generated by the electrical signal with the standard concentration of the electrical signal for comparison, 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 instrument 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 be tested for response with a standard gas before use to ensure that the instrument is truly protected. Humidity sensor probe , , stainless steel heater PT100 sensor , , cast aluminium heater , heating circle fluid solenoid valve
2) Pay attention to the detection of interference between a variety of different sensors.
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.
3) Pay attention to the life of various types of sensors:
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 * short, about one 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. Stationary instruments, due to their relatively large size, have a longer sensor life. Therefore, it is necessary to test the sensor at any time, as far as possible in the sensor's validity period, once the failure, timely replacement.
4) Pay attention to the concentration measurement range of the detection instrument.
All 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 security 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, fixed instruments in use if the over-limit signal, to immediately close the measurement circuit to ensure the safety of the sensor.
In short, the toxic and hazardous gas detector is a powerful tool to ensure industrial ** and staff health. We have to choose the right gas detector according to the specific use of environmental occasions and the functions needed.
