TVOC Online Monitoring System

1.Introduction to TVOC Online Monitoring System Products

TVOC Online Monitoring System can monitor PM10, PM2.5, and continuously track air quality, and is an important means of managing air pollution sources.TVOC Online Monitoring System uses a light scattering fast dust measuring instrument with laser as the light source.The measurement principle is: when light irradiates on particles suspended in the air, scattered light is generated.Under the certain properties of the particles, the scattered light intensity of the particles is proportional to its mass concentration.By measuring the scattered light intensity and applying the mass concentration K value to obtain the mass concentration of the particles.

The instrument can be monitored simultaneously (PM10, PM2.5).A new dust measuring instrument with temperature and humidity compensation, automatic instrument calibration and other functions can effectively reduce the impact of temperature and humidity on the measured value, improve the measurement accuracy in high-humidity climate environments, and continuously monitor particulate matter in the air online.

It has dust sampling, air intake and outlet functions, has filter barrel device, can protect the service life of the air pump, and improve the overall service life of the instrument.It can be continuously monitored in high temperature environments, can work stably and reliably in high temperature environments on the installation site, and can work continuously for 7x24 hours.

2.TVOC Online Monitoring System Sensor Technical Parameters

1.Air temperature, humidity, and air pressure sensors:

1.1 Basic Principles

This series of products adopts a highly integrated temperature and humidity sensor chip, which is calibrated with a digital output with a full measurement range.It adopts 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, both of which are designed on the same chip as a 14-bit A/D converter and a serial interface circuit.

1.2 Basic parameters

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

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

Atmospheric pressure: Measuring range: 300~1100hpa Resolution: 0.1hpa Measuring 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.The traditional three-wind cup wind speed sensor structure is adopted.The wind cup is made of ABS material, which has high strength and is also well started with a smooth internal bearing system, ensuring the accuracy of information collection.The built-in signal processing unit of the cup body can output corresponding wind speed signals according to user needs, and can be widely used in meteorological, marine, environment, airports, ports, laboratories, industry, agriculture and transportation fields.

2.2 Technical parameters

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

Supply voltage: 7-24v DC

Output signal: 4-20mA

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

2.3 Appearance dimensions and installation instructions

2.4 Fixed method

Using the flange installation method, the threaded flange connection makes the lower pipe fitting of the wind speed sensor firmly fixed to the flange.The chassis Φ70mm, four Φ5mm installation holes are opened on the circumference of Φ61mm, and bolts are used to fix it tightly on the bracket to keep the entire set of instruments at the optimal level, ensuring the accuracy of wind speed data, and the flange connection is easy to use and can withstand greater pressure.

3.Wind direction sensor

3.1 Functional Features

Wind direction sensors are professional meteorological instruments used to measure the horizontal wind direction of wind.It uses a Hall angle sensor inside, and a low-inertia light metal wind vane is used to respond to the wind direction.When the wind direction changes, the tail wing rotates through the shaft to drive the shaft core magnet to rotate, thereby outputting a changing voltage signal.It can measure the natural wind direction of 0-360 degrees starting from the north of the label, and has a high cost-effectiveness.It can be widely used in meteorology, oceans, environment, airports, ports, laboratories, industry, agriculture and transportation fields.

3.2 Technical parameters

Measurement 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 structure

3.4 Fixed method

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

Note: During installation and commissioning, please point the arrow on the column to the actual north (with the help of the compass), and a white label with a black arrow printed on the black wind sensor;

4.Pump-suction PM2.5, PM10 sensor:

Supply voltage: DC12V

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

Output method: RS485 (Modbus)

Monitoring principle: laser scattering

Dehumidification principle: Heating and dehumidification

Air pump flow: 2L/min

Size: 230x175x90 (length, width and height)

Weight: Approximately 1.85kg (without 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 measurement range: 0-4999ug/m³ Resolution: 1ug/m³ Measurement error: ±10%.

Noise Measuring range: 40db~130db Resolution: 0.5db Measuring error: ±5% Frequency range: 10-20KHz;

5.TVOC sensor

5.1 Technical parameters

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

6.LED:

General configuration, outdoor P8 monochrome LED single line display

7.Collector parameters:

This data collector adopts contemporary microelectronics technology to record, store and display the operating sensor data, which has the characteristics of reliable work, simple operation, easy data collection and computer analysis.The collector can directly store the collected data on a normal USB drive.After the data collection is completed, the user can directly insert the USB flash drive into the collector to extract data.

Power supply: DC12V/DC

Sensor communication: RS485 Modbus protocol

Network data: GPRS transmission

Internal clock: manual calibration

Data storage: automatic, maximum 160,000 pieces

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

RS485 interface: DB9 pin

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