Mobile TVOC monitoring system

1.Product introduction of mobile TVOC monitoring system

The airborne TVOC monitoring system uses a light scattering fast dust detector with laser as the light source. The measurement principle is: when light shines on particles suspended in the air, scattered light is generated. When the properties of the particles are certain, the scattering of the particles The light intensity is proportional to its mass concentration. By measuring the scattered light intensity and applying the mass concentration K value, the particle mass concentration is obtained.

The instrument can simultaneously monitor (PM10, PM2.5). The new dust measuring instrument has functions such as temperature and humidity compensation and automatic instrument calibration, which can effectively reduce the impact of temperature and humidity on measured values, improve measurement accuracy in high-humidity climate environments, and can Online continuous monitoring of airborne particles.

It has air inlet and outlet functions for dust sampling, and has a filter barrel device to protect the service life of the air pump and improve the overall service life of the instrument. It can continuously monitor in high-temperature environments, work stably and reliably in high-temperature environments at the installation site, and can work 24/7.

2. Sensor technical parameters of the mobile TVOC monitoring system

1. Air temperature, humidity and air pressure sensors:

1.1 Basic principles

This series of products uses a highly integrated temperature and humidity sensor chip with digital output calibrated across the entire measurement range. It uses patented CMOSens technology to ensure that the product has extremely high reliability and excellent long-term stability. The sensor includes a capacitive polymer humidity sensitive element and a temperature sensitive element made of energy gap material. These two sensitive elements are designed on the same chip with a 14-bit A/D converter and a serial interface circuit. .

1.2 Basic parameters

Air temperature: Measuring range: -40℃-60℃ Resolution: 0.1℃ Measurement accuracy: ±3%

Air humidity: Measuring range: 0-100% Resolution: 0.1% Measuring accuracy: ±3%

Atmospheric pressure: Measuring range: 300~1100hpa Resolution: 0.1hpa Measurement accuracy: ±1hpa

2. Wind speed sensor

2.1 Functional features

Wind speed sensors are professional meteorological instruments used to measure the horizontal speed of wind. It adopts the traditional three-wind cup wind speed sensor structure. The wind cup is made of ABS material, which has high strength. At the same time, it cooperates with the internal smooth bearing system to start well and ensure the accuracy of information collection. The built-in signal processing unit in the cup can output corresponding wind speed signals according to user needs, and can be widely used in meteorology, oceans, environment, airports, ports, laboratories, industry, agriculture, transportation and other fields.

2.2 Technical parameters

Measuring range: 0-32.4m/s Accuracy: ±0.3m/s Starting wind speed: 0.2-0.4 m/s

Supply voltage: 7-24v DC

Output signal: 4-20mA

Wind speed value=(output voltage-0.4)/1.6*32.4

2.3 Dimensions and installation instructions

2.4 Fixing method

Using the flange installation method, the threaded flange connection firmly fixes the lower pipe fittings of the wind speed sensor on the flange. The chassis is Φ70mm. Four mounting holes of Φ5mm are opened on the circumference of Φ61mm. Bolts are used to secure it tightly to the bracket. to keep the entire set of instruments at optimal level to ensure the accuracy of wind speed data. The flange connection is easy to use and can withstand greater pressure.

3. Wind direction sensor

3.1 Functional features

A wind direction sensor is a professional meteorological instrument used to measure the horizontal direction of the wind. It uses a Hall angle sensor internally and uses a low-inertia light metal windvane to respond to the wind direction. When the wind direction changes, the tail rotation drives the shaft core magnet to rotate through the shaft, thereby outputting a changing voltage signal. It can measure the natural wind direction from 0 to 360 degrees starting from the label north. It is very cost-effective and can be widely used in meteorology, ocean, environment, airports, ports, laboratories, industry, agriculture, transportation and other fields.

3.2 Technical parameters

Measuring range: 0-360 degrees: (0.4V, or 4MA corresponds to 0 degrees, north direction)

Accuracy: ±1°

Starting wind speed: 0.3m/s

Supply voltage: 7-24v DC

Output signal: 4-20mA

Wind direction value=(output voltage-0.4)/1.6*360

3.3 Appearance and structure

3.4 Fixing method

Using the flange installation method, the threaded flange connection firmly fixes the lower pipe of the wind direction sensor on the flange. The chassis is Φ70mm. Four mounting holes of Φ5mm are opened on the circumference of Φ61mm, and bolts are used to secure it tightly to the bracket. to keep the entire set of instruments at optimal level to ensure the accuracy of wind direction data. The flange connection is easy to use and can withstand greater pressure.

Note: During installation and debugging, please align the arrow on the column with the actual north (a compass can be used to assist). A white label with a black arrow is attached to the black wind direction sensor;

4. Pump suction PM2.5, PM10 sensor:

Power supply voltage: DC12V

Maximum power consumption: (current 2.5A) about 30W

Output mode: RS485 (Modbus)

Monitoring principle: laser scattering

Dehumidification principle: heating dehumidification

Air pump flow: 2L/min

Dimensions: 230x175x90 (length, width and height)

Weight: about 1.85kg (excluding filter element)

Monitoring indicators:

PM2.5 measurement range: 0-999ug/m³ Resolution: 1ug/m³ Measurement error: ±10%

PM10 measurement range: 0-1999ug/m³ Resolution: 1ug/m³ Measurement error: ±10%

TSP measuring range: 0-4999ug/m³ Resolution: 1ug/m³ Measurement error: ±10%.

Noise measurement range: 40db~130db resolution: 0.5db measurement error: ±5% frequency range: 10-20KHz;

5. TVOC sensor

5.1Technical parameters

Detection range: 0-5PPM, resolution 0.01PPM, accuracy <±2%

6. LED:

Conventional configuration, outdoor P8 monochrome LED single line display

7. Collector parameters:

This data collector uses contemporary microelectronics technology to record, store and display running sensor data. It has the characteristics of reliable operation, simple operation, easy data collection and computer analysis. The collector can store the collected data directly into an ordinary USB flash drive. After the data collection is completed, the user can directly insert the USB flash drive into the collector to extract the data.

Power supply: DC12V/DC

Sensor communication: RS485 Modbus protocol

Network data: GPRS transmission

Internal clock: manual time adjustment

Data storage: automatic, maximum 160,000 records

Storage interval: 60-65535 can be set. Unit: seconds

RS485 interface: DB9 pin

Data export: USB port, 485 port to connect to computer, website download