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How to choose the oil fume online monitoring system correctly

by:Rika Sensors     2021-10-14
How to choose the oil fume online monitoring system correctly
In recent years, with the strengthening of environmental protection management, the regulatory authorities have continuously strengthened the installation of oil fume purifiers in full coverage of catering operators, and required restaurants to install systems to remotely monitor the oil fume emissions of restaurants in real time. So when choosing a system, what should we choose?

Before understanding the selection method, the editor will take you to understand the elements monitored in the oil fume online monitoring system: oil fume concentration, particulate matter concentration, and non-methane total hydrocarbon concentration.

About oil fume:

The oil fume we usually emit from cooking is a large amount of thermal oxidation decomposition products produced by edible oil and food under high temperature conditions. When cooking, the fat is heated. When the temperature reaches 170°C, the smoking point of edible oil, blue smoke of initial decomposition appears. As the temperature continues to rise, the decomposition speed increases. When the temperature reaches 250°C, a large amount of oily smoke appears with accompanying It has a pungent odor, and the particle size of oil fume is between 0.01 micron and 0.3 micron. Studies have shown that known mutant carcinogens such as volatile nitrosamines are also found in cooking oil fumes. It is an indoor air pollutant.

About particulate matter:

In the food cooking process of the food service unit, the liquid and solid particulate matter and the particulate matter produced by the cooking fuel are formed and discharged by the physical or chemical changes of oil and various organic substances.

Relevant departments analyzed oil fume samples from frequently fried foods collected from households and detected more than 220 chemical substances, including aldehydes, ketones, hydrocarbons, fatty acids, alcohols, aromatic compounds, esters, and internal Excessive inhalation of esters, heterocyclic compounds, etc. will cause harm to the human body and cause environmental pollution.

About non-methane total hydrocarbons:

According to the current national standard (HJ604-2017), non-methane total hydrocarbons (NMHC) is defined as the residual value after subtracting methane from the total hydrocarbon measurement results; and total hydrocarbons refers to the The sum of gaseous organics that respond on the gas chromatograph hydrogen flame ionization detector under the specified conditions. According to common understanding, NMHC refers to all volatile hydrocarbons except methane (mainly C2-C8). However, this understanding is not practical and cannot be used as the definition of NMHC.

Non-methane total hydrocarbons exceeding a certain concentration, in addition to directly harmful to human health, under certain conditions, sunlight exposure can also produce photochemical smog, which is harmful to the environment and humans.

So how should we choose the system correctly? A system that complies with government regulations should have the following features:

1. It can monitor oil fume concentration, particulate matter concentration, and non-methane total hydrocarbon concentration in real time, and can set upper limit values u200bu200band automatically alarm when the limit is exceeded.

2. It can detect whether the fan and the purifier are working at the same time, and the detection current alarm value can be set according to the power of the fan and the purifier, which is suitable for fans and purifiers of all powers.

3. An open-type current transformer is required, and measurement can be done without cutting off the fan or purifier cable.

4. Independent working time period can be set, alarm for over limit within the time period, no alarm for over limit outside the time period.

5. The data can be directly uploaded to the environmental monitoring cloud platform, the government oil fume monitoring platform or the customer's platform.

6, AC 220V power supply, IP65 or above protection level, can work outdoors all year round, not afraid of rain and sun.

In addition to the above functional characteristics, there are two other functions that need special attention:

1. Whether it has a dehumidification function

We know that in the kitchen, in addition to frying, blasting, burning, and frying, there are Steaming, boiling, stewing, braising and other cooking methods will inevitably produce water vapor. If there is no dehumidification function, when the water vapor enters the sampling probe of the oil smoke detector, the sensor will detect the water vapor as particulate matter, causing measurement errors . So when you choose a product, you should pay attention to whether it has a dehumidification function. The oil fume detector has a dehumidification function. In response to this feature, the editor conducted a test. The test showed that the system will not be affected by the large amount of steam generated by the steamer and basket in the kitchen, and can ensure the accuracy of the monitoring data.

(Experimental video)

2. Whether it is equipped with an electrochemical sensor for monitoring non-methane total hydrocarbons

The system needs to monitor oil smoke concentration, particulate matter concentration, and non-methane total hydrocarbon concentration. Parameters, the product should have three built-in sensors to meet government requirements. However, the editor found that in some online instruments on the market, the value of non-methane total hydrocarbons is calculated from the concentration of particulate matter. There is no separate electrochemical sensor for actual measurement. This calculation method is wrong. So how to identify whether there is an electrochemical sensor for monitoring non-methane total hydrocarbons in the product? Xiaobian teaches you a method.

Use lighter gas (the main component is butane) to spray continuously on the sampling probe. If you see the value of non-methane total hydrocarbons continue to increase, (butane is an organic compound, and the composition of organic compounds is similar to grease, so the concentration of oil smoke is also Will increase accordingly) but the particle concentration is basically unchanged, it can prove that the product contains an electrochemical sensor. If the non-methane total hydrocarbon value does not change, it means that the product does not contain an electrochemical sensor.

The editor took the oil smoke detector as an example to do an experiment, and the experiment showed that the product contains an electrochemical sensor, which meets the government's environmental protection requirements.

(Experimental video)

The above is the summary of the editor, everyone must pay attention when purchasing the system~

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