China Education Equipment Procurement Network News: At present, with the development of manufacturing technology, portable multi-gas (composite) detector is also a new option for us. Since this detector can be equipped with multiple gas (inorganic / organic) detection sensors required on a host, it has the characteristics of small volume, light weight, corresponding fast, and simultaneous multi-gas concentration display. More importantly, the price of the pumped composite gas detector is cheaper than that of multiple single diffusion gas detectors, and it is also more convenient to use. It should be noted that when selecting this type of detector, it is best to choose an instrument that has the function of individually switching each sensor to prevent the use of other sensors due to damage to one sensor. At the same time, in order to avoid the blockage of the suction pump due to water intake, it is also safer to choose an instrument with a smart pump design that has a pump stop alarm.
Points to note when using a gas detector:
1) Pay attention to regular calibration and testing
The toxic and harmful gas detectors are also measured by a relatively comparative method like other analytical detection instruments: first calibrate the instrument with a zero gas and a standard concentration of gas, and obtain the standard curve and store it in the instrument. During the measurement, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration to calculate an accurate gas concentration value. Therefore, zeroing the instrument at any time and regular calibration of the instrument are essential tasks to ensure accurate measurement of the instrument. It should be noted that at present, many gas detectors can be replaced with detection sensors, but this does not mean that one detector can be equipped with different detector probes at any time. At any time, in addition to a certain sensor activation time when replacing the probe, the instrument must be recalibrated. In addition, it is recommended that all kinds of instruments be tested for response to the instrument's calibration gas before use to ensure that the instruments really play a protective role.
2) Pay attention to the detection interference between different sensors
Generally speaking, each sensor corresponds to a specific detection gas, but it is impossible for any gas detector to be absolutely special. Therefore, when choosing a gas sensor, you should try to understand the detection interference of other gases on the sensor to ensure its accurate detection of a specific gas.
3) Pay attention to the life of various sensors
All kinds of gas sensors have a certain service life, that is, life. Generally speaking, in portable instruments, the life of the LEL sensor is longer, and can generally be used for about three years; the life of the photoionization detector is four years or longer; the life of the electrochemical specific gas sensor is relatively short, generally In one year to two years; the life of the oxygen sensor is the shortest, about one year. The life of the electrochemical sensor depends on the dryness of the electrolyte, so if it is not used for a long time, it can be extended to a certain life by sealing it in a lower temperature environment. Due to the relatively large size of the fixed instrument, the life of the sensor is also longer. Therefore, it is necessary to detect the sensor at any time, use it as long as possible within the validity period of the sensor, and replace it in time if it fails.
4) Pay attention to the concentration measurement range of the detection instrument
Various types of toxic and harmful gas detectors have their fixed detection range. Only when the measurement is completed within its measurement range can the instrument be accurately measured. If the measurement is exceeded for a long time, it may cause permanent damage to the sensor.
For example, if the LEL detector is accidentally used in an environment with more than 100% LEL, it may burn the sensor completely. Toxic gas detectors, working at higher concentrations for long periods of time can also cause damage. Therefore, if a fixed instrument sends out an overrun signal during use, the measuring circuit should be immediately turned off to ensure the safety of the sensor.
In short, the toxic and harmful gas detector is a powerful tool to ensure industrial safety and the health of workers. We need to select the appropriate gas detector according to the specific use environment and required functions. At present, the detectors available for our selection include fixed / portable, diffusion / pumped, single gas / multiple gas, inorganic gas / organic gas, and many other combinations. Only by choosing the right gas detection equipment can we really achieve more with less effort and prevent future problems. (Xie Yinan / Editor)
product description:
Product Picture Product Name / Model Product Introduction
BW CLIP waterproof four-in-one gas detector measuring range: flammable gas (0-100% LEL or 0-5% methane); hydrogen sulfide (0-200 ppm); carbon monoxide (0-1000 ppm); oxygen (0 -30% vol) Power supply voltage: 3VDC (built-in rechargeable lithium battery) Operating temperature: -20 to 50 ° C Relative humidity: 5% to 95% RH (non-condensing) Service life: more than 3 years
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