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What are the common oil smoke monitors?

by:Rika Sensors     2021-12-08
What are the common oil smoke monitors?
Oil fume monitoring can be said to be part of air quality monitoring. Because of its particularity, it is often overlooked by people.

At present, catering companies are increasingly polluting the atmosphere. Although most companies have certain pollution prevention measures for oil fume, some companies, especially small catering companies, do not discharge emissions in accordance with the requirements in order to control costs. Due to the large number and dispersion of enterprises, it is difficult to achieve the monitoring effect by manpower alone. Scientific and technological means must be used to achieve the purpose of comprehensive coverage of pollution source monitoring.

The most commonly used in the field of oil fume monitoring is the oil fume monitor. So which oil fume monitors are on the market?

1. Principle of electrochemical monitoring

A sieve sensor with porous positions. When oil fume particles enter the sensor, the pores of the sensor will receive oil fume particles, which will increase the resistance of the sieve, which will affect the current The intensity changes, because there is a linear relationship (proportional relationship) between the current intensity and the oil smoke concentration, so the oil smoke concentration can be calculated according to the electric field (current) intensity.

Features: low accuracy, maintenance is required once every 1 to 2 weeks on average, unilateral installation is adopted, but the probe needs to be replaced every year.

Second, the principle of optical monitoring

Adopt bilateral fixed installation, one end is the transmitting end, and the other is the receiving end. The transmitting end will continuously send out an infrared light wave to the receiving end. When the oil fume particles enter the sensor, astigmatism will be generated when the oil fume particles meet the laser beam, and the receiving end will receive such optical changes, so that the concentration of oil fume can be obtained. .

Compared with the electrochemical monitoring principle, its monitoring accuracy is high, the anti-vibration ability of bilateral installation is poor, the value is prone to be inaccurate after deviation, and the outlet of the purifier vibrates greatly.

Disadvantages: Since there is no back-flushing system, the probe needs to be cleaned regularly when it is used for about 1 to 2 months.

3. Principle of light scattering monitoring

According to the measurement principle, the particle concentration measurement technology of light scattering method is divided into two types: static light scattering method and scattering focusing method.

According to the size of the scattering angle, the static light scattering method can be divided into forward light scattering method and back light scattering method.

Forward light scattering: The optical lampblack monitor is based on the principle of forward light scattering. A laser beam with a wavelength of 635nm is irradiated into the flue to be measured. The oil smoke particles in the flue cause the laser beam to scatter, and the intensity of the scattered light is proportional to the amount of oil smoke particles. Therefore, the corresponding relationship between the concentration of oil fume and the intensity of the scattered light of the laser can be established. After the factory standard concentration is calibrated, the accurate oil fume concentration can be obtained by measuring the intensity of scattered light. Single-sided installation, good anti-vibration ability; installed with a blowback system, maintenance-free, high precision.

Backscattering: The backscattering method uses the radiation conduction equation of the medium to describe the multi-scattering process, and then selects appropriate boundary conditions to solve the equation. The measurement device of the back light scattering method is also relatively simple, the laser and the light detector are on the same side, and no angle calibration is required.

Concentrated light scattering method: In this method, the monochromatic light source (infrared) of the monitoring channel is in a straight line with the receiving end. When the sample enters the monitoring channel and converges with the red light to generate scattered light, the receiving end receives this optical The changes are converted into digital signals (electrical signals), which are amplified and transmitted to the detector for display. The accuracy is about 10 times higher than that of the forward light dispersion.

The diffusion type oil fume monitor is an online oil fume monitoring host designed by our company in response to the country's supervision of cooking fume in the catering industry. The host can measure the oil fume concentration, particulate matter concentration, and non-methane total hydrocarbon (NMHC) concentration of the kitchen exhaust pipe for 24 hours, and upload it to our free monitoring platform or government monitoring platform.

In order to prevent the business's purifier or fan from not starting, the host can also collect two current signals through a current transformer to monitor whether the purifier or fan is actually started. In order to facilitate the operation of the installer, the whole machine adopts a 7-inch capacitive touch screen, and the all-Chinese interface is easy to understand. The host has a GPRS (optional 4G) communication interface, which can be inserted into an ordinary mobile phone card or an IoT card for data upload, and the data can be uploaded where there is a mobile phone signal.

In response to the complex problem of oil fume composition at the oil fume monitoring site, our company has designed a special sensor that can accurately analyze the concentration of oil fume and particulate matter, and the monitoring is more accurate. With reasonable design, it can achieve long-term operation and maintenance-free, and can be maintained once every six months at the longest.

Functional characteristics of the oil smoke monitor:

1. The 7-inch capacitive touch screen is easy to operate, and the full Chinese operation interface is beautiful and generous;

2. It adopts an open-type current transformer, no need to cut off the fan or purifier The cable can be measured;

3, AC 220V power supply, IP65 protection level, can work outdoors all year round, not afraid of rain and sun;

4, can set three independent working time periods, time Only when the limit exceeds the limit within the segment, the alarm will not be alarmed when the limit is exceeded outside the time period;

5. Real-time monitoring of the oil smoke concentration, particulate matter concentration, and non-methane total hydrocarbon concentration, and the upper limit can be set, and the limit will be automatically alarmed;

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

7, 1 GPRS (optional 4G) communication interface, data can be directly uploaded to the free cloud platform provided by our company, government oil fume monitoring platform or customer platform.

Whether it's automation or artificial intelligence, the rapid convergence of technology and business often determines sensor solution’s competitiveness.
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