How to choose accurate testing points when using a formaldehyde detector for mobile testing?
1, Prioritize coverage near the source of formaldehyde emissions
Formaldehyde mostly comes from decoration materials and various types of furniture, such as newly painted walls, newly laid composite flooring, customized cabinets, newly installed display cabinets, etc., all of which need to be carefully tested.
When using a formaldehyde detector to detect walls, points can be placed at a distance of 30 to 50 centimeters and a height of 1.2 to 1.5 meters from the wall. This height is close to the range of human daily breathing and can better capture formaldehyde released from the wall. When inspecting cabinets or display cases, it is necessary to measure them once inside and at a distance of 20 to 30 centimeters from the surface after opening the door or drawer. This is because the concentration of formaldehyde inside these types of furniture is usually higher and can spread to the surrounding areas after release.
2, Combining spatial layout and air circulation conditions
In large spaces such as living rooms, office halls, and shops, it is not advisable to measure only one point. It is recommended to distribute 2 to 3 points every 50 square meters, evenly distributed in different areas of the space, such as near workstations in the office area, display areas in shops, and the middle and corners of the hall, to avoid data bias caused by different local air circulation.
If there are ventilation openings and air conditioning vents in the space, it is necessary to avoid these locations when selecting points, because the air flow at the vents is fast, which will dilute the formaldehyde concentration, and the value measured by the formaldehyde detector may be low. In places with poor air circulation such as corners and behind furniture, formaldehyde is prone to accumulate and requires targeted testing.
3, Pay attention to high-frequency areas of human activity
The locations where people often stay in their daily lives, such as workstations in office spaces, near cash registers in shops, and rest areas to be used after decoration, have a closer relationship between formaldehyde concentration and human health and must be included in the testing scope. When selecting points, it is necessary to maintain a height consistent with human respiration, generally between 1.2 and 1.8 meters, so that the measured data can better reflect the actual formaldehyde situation inhaled by humans.
4, Avoid possible interfering factors
Do not place the formaldehyde detector near heat sources during testing, such as radiators or air conditioning units. High temperatures can accelerate formaldehyde release, leading to abnormal local concentration increases, which cannot represent the overall environmental situation; Do not test immediately after spraying cleaning agents or air fresheners, as these products may contain volatile components that can interfere with the readings of the detector.
In addition, during mobile detection, the formaldehyde detector should be allowed to stay stable for 5 to 10 minutes at each point, and the results should be recorded after the data no longer fluctuates. This is to avoid reading immediately after placing the instrument at the point, as the instrument has not yet adapted to the environment, which can easily lead to inaccurate data.
