Technical indicators
1. Measurement range: 0-10 PPM
2. Latest reading: 0.01PPM
3. Accuracy: Reading 2%+0.01
4. Volume: 150 (L) X 80 (W) X 34 (H) MM Box: 226 X 230 X 50
5. Weight: 750g
6. Power supply: 9V power supply
7. Serial interface: Through this interface, the 400 analyzer can be combined with a personal computer for data acquisition and analysis.

3、 Usage method
1. Sampling
Power on: Press the switch (ON-OFF), display..., flash for three seconds to check the sensor. When the display shows 0.00, it indicates that the instrument is ready for sampling.
Sampling: Hold the analyzer in the atmosphere to be sampled, press the sample button, display (run), and hear the internal sampling pump sound for about 2 seconds.
Reading: During the analysis of the sample by the instrument, you will see a reading within 0.00, which is the concentration of formaldehyde in ppm, visible after about 10 seconds.
Shutdown: Press the ON/OFF button to turn off the device. If you forget to turn it off, it will automatically shut down after 5 minutes.
2. Reset phase of sensors
Sensor reset: After a test, the sensor should be turned off for a few minutes to reset. Generally speaking, the higher the concentration of formaldehyde, the longer the time required for resetting. If the sensor is turned on for measurement before resetting, it will flash and the sampling pump will not work. When you see a flash of 0.003 seconds after turning on the sensor, and it has already been reset, the next measurement can be carried out.