In daily life, in fact, we often come into contact with some areas where there are toxic and harmful gases, such as flammable and toxic gas industries, or septic tank sewage pipeline operations. In these areas, there is no doubt that the body of the practitioners is a great harm, therefore, the gas detector has become our indispensable 1 detection tool. However, many friends are not clear about the detection standards of the gas detector, which leads to the purchase of gas detectors that do not meet the requirements of on-site use. So what is the gas detector test standard? The following is a brief introduction by yi yun Tian:

gas detector test standards, as follows:

1. appearance and functional inspection

1. Inspection appearance and other items

Check the appearance of the gas detector, this is to avoid the gas detector in the transportation or in the production and assembly process of small problems, we need to check the appearance of the gas detector for defects, cracks or damage, check the entire gas detector component structure is complete.At the same time, check the machine model, label, manufacturer's name and factory time on the body of the gas detector and check them one by one with the instructions or the information given by the manufacturer to ensure accuracy. At the same time, check the explosion-proof mark, measurement license mark and number of the gas detector, which must be complete and clear. Some certificates can be provided by the manufacturer.

2, power-on check

The gas detector needs a power supply to work, which is usually powered by a built-in battery, we need to turn on the switch to check whether the gas detector is powered on normally. Some gas detectors continue to work by replacing the battery. Some gas detectors are equipped with chargers. For gas detectors equipped with chargers, we need to test whether the charger is charged normally. In the case of normal power on, we need to check whether the display screen of the gas detector is normal.

3. check whether the sound and light alarm of the instrument is normal

for the gas detector with sound and light alarm signal, because the battery is used for power supply, when the undervoltage display, it should be able to send out a sound or light indication signal that is clearly different from the alarm signal.

2. indication error

The gas detector we purchased is used to detect gas concentration, the gas detector cannot display the gas concentration very well. It has errors, but there is a range of errors. If it exceeds this range, it means that the gas detector does not meet the standard. For different gases, the indication error specified by it is different. For example, it is normal that the indication error of oxygen is within ± 0 and 5% VOL.

3. alarm error

In addition to the error of the displayed value, the alarm value also has certain allowable error in the gas detector, because the instrument will be affected by various factors, it is impossible to alarm at an accurate concentration every time, so the concentration of the alarm is allowed to have errors, as long as the error is within the standard range. For different gases, its alarm error is also different, for example, the alarm error of oxygen is within ± 0 and 1% VOL.

4. response time

The response time refers to the 90% of the stable value that the gas detector should reach from zero to the instrument. the time needed, this time is also required by the standard, which is different for different gas response times as well as indication error and alarm error.

5. insulation withstand voltage

there are some insulation withstand voltage standards for gas detectors that must be met. the standard requires: at normal temperature: ≥ 100MΩ; after damp heat: ≥ 1MΩ. Insulation strength should be able to withstand 500V AC voltage lmin, discharge and breakdown should not occur, these are in line with the gas detector to show that the standard.

In summary, it is the gas detector test standard. As long as the gas detector meets the testing standards, the accuracy of the testing data can be better ensured, so as to better protect our personal safety.