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The detection principle and function of TVOC transmitter

by:Rika Sensors     2021-12-07
The detection principle and function of TVOC transmitter
Introduction: The U.S. Environmental Agency (EPA) defines VOC as: In addition to carbon monoxide, carbon dioxide, carbonic acid, metal carbides, carbonates, and ammonium carbonate, any carbon-containing compound that participates in photochemical reactions in the atmosphere is called VOC. The various measured VOCs are collectively referred to as Total Volatile Organic Compounds (TVOC).

In a blink of an eye, it’s the golden nine silver ten decoration season, and when it comes to decoration, we will inevitably have a headache on decoration pollution caused by furniture, paint, floor, wallpaper, etc. In fact, we have always had a deep misunderstanding about decoration pollution. , That is the strange smell after the new home is decorated. Everyone always thinks it is the smell of formaldehyde; in fact, this is wrong. Formaldehyde is indeed harmful to the human body, but formaldehyde itself is colorless and odorless, which causes a strange smell. 'The culprit' is a type of gas that we don't often hear-TVOC. TVOC is widely present in the atmosphere and is very harmful to the human body, but little is known about its existence. The following editor will take you to talk about this unfamiliar TVOC.

What is TVOC?

TVOC comes from a wide range of sources, which can cause serious indoor air pollution, cause imbalance in the body’s immune level, affect the function of the central nervous system, and show dizziness, headache, drowsiness, weakness, chest tightness and other conscious symptoms; it can also affect digestion System, then problems such as loss of appetite, nausea, etc., and even damage to the liver and hematopoietic system, allergic reactions occur in severe cases.

TVOC is one of the three organic pollutants (polycyclic aromatic hydrocarbons, volatile organic compounds and aldehyde compounds) in the air that has a more serious impact. VOC refers to organic matter whose saturated vapor pressure exceeds 133.32pa at room temperature. Its boiling point is between 50°C and 250°C. It exists in the air in the form of evaporation at room temperature. Its toxicity, irritation, carcinogenicity and special odor , It will affect the skin and mucous membranes and cause great damage to the human body.

The main source of TVOC is outdoors, mainly from fuel combustion and transportation; indoors, it mainly comes from combustion products such as coal and natural gas, smoke, heating and cooking, etc.; in the interior decoration process Among them, TVOC mainly comes from paints, coatings and adhesives; there are nearly a thousand kinds. How should TVOC be monitored? The editor here recommends the TVOC transmitter developed and produced.

How to monitor TVOC?

The RS-TVOC-N01TVOC transmitter introduced can effectively monitor the TVOC content in the environment. When the TVOC is detected, its related information can be converted into electrical signals, and then the gas to be measured can be monitored, analyzed and alarmed . Monitoring principle: When the sensor detects the presence of TVOC gas in the air, its conductivity will change accordingly. The higher the concentration of TVOC gas, the higher the conductivity of the sensor. A simple circuit is used to control this conductivity. The change in is converted into an output signal corresponding to the gas concentration.

The TVOC transmitter can monitor the concentration of indoor TVOC harmful gases in real time. It is equipped with imported high-sensitivity gas detection probes. At the same time, it uses high-performance signal acquisition circuit, which has the characteristics of signal stability and high accuracy; the output adopts RS485 output. And analog output; the outer shell is a king-shaped shell, which is waterproof and dustproof, and has a high degree of protection. The installation method is wall-mounted installation, which is simple and convenient.

Data upload cloud platform

The data collected by the TVOC transmitter can be uploaded to the cloud platform through the concentrator. The cloud platform can use the computer and mobile terminals to log in, and the user can log in through the Cloud platform account password login anytime and anywhere to view real-time data and historical data of indoor TVOC gas concentration.

Through the cloud platform, we can set the upper limit alarm value of the indoor TVOC gas concentration. According to health standards, the indoor TVOC gas concentration that is basically harmless to human health is between 0.16mg/m and 0.3mg/m. We can use this to set the upper limit. When the TVOC gas concentration exceeds the pre-standard upper limit, the cloud platform will notify the responsible person through platform alarms, SMS alarms, email alarms, etc., and take timely measures to reduce the TVOC gas concentration.

In fact, in addition to being used for decoration pollution monitoring, TVOC transmitters are also widely used in oil extraction, smelting, chemical industry, municipal administration, sewage treatment, power gas, mining, tunnel construction, fire storage, papermaking, pharmaceuticals, brewing, etc. It is necessary to detect toxic and harmful gases in an environment where work is carried out.



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