Overview: Handheld dust quick detector is the special detecting instrument used to measure the value of PM2.5 (repairable particles) and PM10 (inhalable particle) in the air. It is a high-tech product developed independently and integrating gas dynamics, digital signal processing and optical-mechanical-electrical integration on the basis of absorbing oversea advanced high sensitivity micro laser sensor technology. The device is characterized by high test precision, stable performance, strong multiple functions and easy and convenient operation and can be used widely for determination of indoor and outdoor public environment and atmospheric environment, PM2.5 air quality detection and PM2.5 dust particle amount. II.Specification: - PM2.5 air quality detection: PM2.5 Pm10 - Range: (0-1000ug/m3 ) - Concentration unit: ug/cubic meter (ug/m3) - Detection sensitivity: 1ug - Measurement error: < 20% - Three-channel dust particle counter: 0.3um 2.5um 10um - Flowrate: 1L/min - Concentration unit: piece/L - Sampling method: pumping - Sampling principle: light scattering - Light source: laser diode - Detection method: manual - Automatic power-off function: it will power off automatically if there is no operation within 2 minutes at power-on state. Environmental condition: - Application environment: temperature scope: 5~45degree C - Humidity range:<90%RH - Storage environment: temperature scope: -20~60degree C - Humidity range:<90%RH - Sampling time: 50s - Resolution ratio of sensor: 1ug/m3 - Storage record: 1000 groups of data - Temperature measurement range: -40~ +125 degree C Precision 0.5degree C - Humidity measurement range: 0-100%RH Precision 2%RH - Screen size: 2.8" - Display screen: 2.8320*240 LCD color back light Power supply: - Adaptor: 100-240VAC 50/60H output; DC9V=500mA (the connection is used for charging and should be used at power-off state). - Connection of USB port line - 7.4V Rechargeable lithium battery/1100mAh (the battery cannot be dismantled at will. Please contact the manufacturer is it needs to dismantle the lithium battery). - Work time of the battery: the time for continuous test is longer than 3 hours. - Display of remaining energy: three-grid battery electricity display (it needs to charge if one grid of electricity is left. The charging should be made before the battery electricity displays red. This will result in reducing service life and capacity of the battery). The electricity is tested once at the time of power on. - External size: 245*40*85mm - Weight: 325g (battery included) III. Use method Power on - Take out the product from the package. After the power key is pressed, product LOGO is displayed and it enters the main page and displays the interface of dust particle number/L or PM2.5 air quality ug/m3 (interface may be changed at functional parameters). - Power off: At power-on state of the instrument, press power key ( )to power off. The instrument will power off automatically if there is no operation within 2 minutes. Note: - When power supply of battery and adapter exists at the same time, the circuit adopts adapter as power supply. 1. When the adapter is disconnected, the circuit adopts battery as power supply. - When power adapter is used to provide supply, it is not necessary to pull off the plug of the power adapter. If there is no operation within two minutes, the instrument will power off undoubtedly and automatically. After automatic power off, the adapter charges the lithium battery. The time of charging is two hours. - The instrument will appear with sleep state if it is not used for a long time and cannot power on. At the moment, adapter may be disconnected to wake up the circuit of power supply. If the electricity display on the top right corner is not three grids of full electricity after powering on, it is necessary to charge the battery of the instrument. Description of key function - RUN key: Press the key once and the instruments screen displays the sampling time and begins countdown of 50s. The collected data is displayed once every 10s. For the collected data, the data of last collected is correct reference data. - When Down key is pressed once, the instrument enters historical record functional parameter setting in proper order. Data may be checked at the bottom of history page. Press ENTER to confirm the state of certain page for specified check of current page in historical record. At the moment, SHIFT key may be used to select hundred place tens place unit place of current page. Press UP (a?2) key or DOWN (a??) key to select 001-999 page of current page. At the page of functional parameters, press ENTER to confirm that funct