Application of New Oxygen Sensor in Energy Conservation and Emission Reduction
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Conventional lead-containing oxygen sensors The oxygen sensor traditionally used for exhaust gas detection can be considered as a two-electrode metal-air battery consisting of an air cathode, a lead anode, and an alkaline electrolyte. The cathode is a piece of polytetrafluoroethylene (PTFE) film coated with an active catalyst. The anode is a lead block that is wrapped in a sealed metal or plastic container. Air enters the sensor through the top capillary and the cathode connects to the sensor's two pins through the current-collecting wire, as shown in Figure 1: 
Although the leaded oxygen sensor has a history of more than 30 years, it also has its limitations:
(1) Combustion products affect the service life. Combustion products generally contain acidic gases such as carbon dioxide (CO2), nitrogen oxides (NOX), and sulfur dioxide (SO2). The inside of the sensor is alkali solution. After a long time of use, the PH value of the alkali solution will decrease, and the lead consumption of fuel will also be accelerated, thereby shortening the life of the sensor.
(2) Does not meet lead-free requirements. Although lead-containing sensors are now immune from RoHS and WEEE, lead-free sensors will gradually replace lead-containing sensors and have become an irreversible environmental trend.
(3) Large weight and large volume. To increase the life of the sensor, it is necessary to increase the weight of lead.
Long-acting lead-free oxygen sensor technology features For the shortcomings of lead-containing oxygen sensors, the second generation of three-electrode long-life lead-free oxygen sensor 4OXecoLP came into being. "eco" means "economy," and "LP" means "low power."
First, from the working principle, oxygen is reduced at the working electrode of 4OXecoLP: 
(1) Long life. During the entire reaction, the highly active electrode only acts as a catalytic oxidation or reduction without any consumption, thus avoiding the problem of depletion of the anode electrode fuel of the conventional lead oxygen sensor. 4 OXecoLP's unique structural design provides excellent control of the volatilization of the electrolyte inside the sensor, so its service life also greatly exceeds that of conventional oxygen sensors. With a temperature range of 0°C to 60°C and a relative humidity range of 40% to 75%, the life of this sensor can exceed 5 years.
(2) Acid-resistant gas. 4OXecoLP uses an acidic electrolyte, which can effectively avoid the interference of acid gases generated by the combustion of many types of fuels such as natural gas, petroleum, wood, and biomass, and ensure the applicability of the sensor in various fuel use environments.
(3) Light weight. Lead-based oxygen sensors used in the emission field, such as 5FO, weigh 44g; while 4OXecoLP only has 5g, which has a significant weight advantage. It provides the necessary conditions for the development of a small, lightweight combustion efficiency table.
(4) There is certification. 4OXecoLP has been used in handheld instruments of a well-known German brand and has obtained TÃœV certification. The implementation standard is EN50379-2 and the failure rate is less than 1% during the warranty period.
(5) RoHS and WEEE compliance. 4OXecoLP is lead-free, which makes it possible for the instrument to pass RoHS and WEEE certification.
(6) Complete technical documentation. We can provide users with sensor characteristic documents, operating principles and reference circuits to protect our customers' applications.
Long-term lead-free oxygen sensor 
(1) The SEN voltage is 600mV lower than REF and the accuracy requirement is ±10mV.
(2) The bias voltage needs to be divided by the reference voltage chip and matched with a suitable filter capacitor.
(3) Op amps use precision rail-to-rail input and output op amps as much as possible. The quiescent current is preferably less than 10uA, mainly to extend battery operating time.
(4) The sensor current flows outward from SEN and Vout decreases with increasing oxygen concentration.
(5) When the meter is not in use, D1, IC1, and IC2 should not be powered down as much as possible, because it takes more than 45 minutes for the 4OXecoLP signal to fully balance.
(6) If users think that the positive and negative power supply is troublesome, you can contact our representative office. We can provide you with a single power supply circuit.
(7) The preamplifier circuit should be as close to the sensor as possible, which can minimize electromagnetic interference and improve the signal-to-noise ratio.
(8) If you want to design an intrinsically safe circuit, the surface area and thermal resistance of each electronic component need to be calculated in detail.
The application history of 4OXecoLP in the market can be traced back to 2010. Citytech customized this product for a well-known German company, successfully applied it to the flue gas analyzer, and obtained the TüV certification. The sensor has been praised by end-users for its characteristics of miniaturization, resistance to acid gas interference, and long life. At present, domestic and foreign manufacturers of major flue gas analyzers have tried 4OXecoLP successively. The test data is very satisfactory and is expected to be put into use in large quantities in the second half of this year.
According to the characteristics of 4OXecoLP, the specific application is as follows:
(1) On-line smoke analysis table. At present, domestic use of zirconia or partial pressure type lead oxygen sensor on-line monitoring of oxygen, the latter's theoretical life of nearly 5 years, but by the inlet temperature and humidity changes, life can often only reach a year or so, and its resistance to high concentrations Acid gas interference is weak and limits the user's application range. 4OXecoLP is not affected by the temperature and humidity of the intake air, it can work stably for 5 years under the condition of high concentration acid gas interference, and at the same time, it can save users a lot of maintenance costs due to sensor failure during the warranty period (product replacement and poor trip). We expect the annual capacity of this product in the Chinese market to be 4-5 thousand, and maintain an annual growth rate of 15%-20%.
(2) combustion efficiency analysis table. Currently, the combustion efficiency analysis table is mostly used for the analysis of the combustion efficiency of industrial boilers, but with the gradual adoption of domestic boilers, especially the successful application of condensing boilers, the household heating market will have an explosive growth, and the combustion efficiency analysis table will gradually With the expansion, the monitoring mechanism is more complete, and the boiler production plants and maintenance organizations need to be equipped with analysis tables. We expect that the annual capacity of this product in the Chinese market will be 4-5 thousand, and maintain an annual growth rate of 20%-25%.
(3) Flue gas analyzer. Domestic smoke analyzers are mostly box-type, with internal lead-oxygen sensors and large-size 3 series gas sensors. We can provide 4OXecoLP and 5 series gas sensors to replace them, making it easier for instrument manufacturers to make products lighter and thinner. Short and small development.
Concluding remarks During the "12th Five-Year Plan" period, China's energy-saving emission reduction situation is grim, but at the same time it also provides a huge business opportunity for related instruments. British City Technology Corporation will unswervingly promote technological innovation and abide by the Six Sigma manufacturing concept. The launch of 4OXecoLP is a perfect interpretation of our technological innovation and manufacturing concept. We will continue to provide our customers with products that meet stringent quality standards and the most accurate and reliable gas detection solutions in order to perfectly meet the specific needs of various customers under the major goal of energy saving and emission reduction.
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