Frequently asked questions when using formaldehyde analyzer Because the 4160 formaldehyde analyzer has very high sensitivity and resolution (it can detect and distinguish the formaldehyde content of one hundred millionth), like all precision instruments, it is required to exclude the environmental impact when using it to ensure the test results of the instrument accuracy. 1. The instrument displays negative values ​​or value fluctuations The instrument shows that the negative value is usually the effect of human exhaled gas.During the detection, the inlet of the sampling tube should be more than 1 meter away from the detector, or the inlet of the sampling tube should be pointed behind the detector. In addition, the sampling tube or the air inlet connection tube inside the instrument is not firmly connected and leaks, which will also cause the instrument to display negative values ​​or value fluctuations. The wind speed of the detection environment should be as small as possible. According to Article 4 of A.0.3 in GB50324-2001, the air flow rate is 0.1 ~ 0.3m / s. If the wind speed of the detection environment is too large, the concentration of formaldehyde gas in the environment will fluctuate, so The test results of the instrument will also fluctuate. 2. The detection value is obviously too small If the person has felt the stimulation of formaldehyde during the detection, but the displayed value of the instrument is very small, this phenomenon is usually caused by the connection tube when the instrument is zeroed, and the zero tube is not inserted tightly between the instrument and the instrument. If the connection is not tight, During zero adjustment, the gas does not actually pass (or partially pass) the zero adjustment tube and enters the instrument directly. At this time, the zero point of the instrument is not the real zero point, but the concentration value of formaldehyde gas in the environment. After removing the zero adjustment tube, The detected value changes little. The method of checking whether the connection is tight is very simple. When zeroing, the air inlet of the zeroing tube is blocked by hand.If the instrument pump is held almost unchanged, it indicates that the connection is tight; if the frequency of the instrument pump is unchanged or does not change much, It means there is a problem with the connection. 3. The instrument response time becomes longer The formaldehyde sensor should be maintained regularly, and deionized water needs to be injected every two to three months of use. If the sensor is not filled for a long time, the response time of the sensor will become longer and the sensitivity will decrease. If the water loss exceeds 25g, the sensor will be scrapped. Turn off the power of the instrument during water injection, open the right panel of the instrument, and the cylindrical sensor can be seen at the upper back of the instrument. Unplug the sensor signal wire and the air inlet and outlet tubes, and then use a cross screwdriver to remove the two screws on the upper back of the instrument and take out the sensor Weighing; the weight of the sensor (about 240g) is marked on the side label of the sensor, and the weight of the deionized water injected should be equal to the weight of the sensor. Inhale the deionized water with a syringe (1mL is about 1g) and spray the water into the water injection hole (do not (Pin the needle in). Excessive water injection can damage the sensor. After being filled with water, the instrument needs to be placed for more than 12 hours to be stable
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