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The configuration of zirconia oxygen analyzers is carried out based on the specific conditions at the point of use; Changhui Instruments shares its experience in configuring such analyzers for three different scenarios: oxygen concentration measurement in the combustion exhaust gases of small portable fuel boilers, large boilers, and very large thermal furnaces. Before selecting a zirconia oxygen analyzer, it is necessary to understand the on-site process conditions and control requirements, such as whether automatic calibration is required If combustible gases are present, whether a zirconia oxygen analyzer requires safety protections or not – the following introduces the three most basic system configuration types. Example 1 of zirconia oxygen analyzer system configuration: This is the simplest system, consisting solely of a zirconia detector and a converter. It includes a separate zirconia oxygen analyzer, a zirconia detector, a standard gas supply unit, and stop valves for the calibration gas pipelines. This configuration is most suitable for monitoring the oxygen concentration in the combustion exhaust of small, mobile fuel boilers. When installing a zirconia detector, no reference gas pipeline is required; the reference gas (air) can be the air present at the installation site. Example 1 can be calibrated using a portable standard gas apparatus; the zero gas and span gas (air) released from the standard gas apparatus are delivered to the zirconia detector through pipes, and it is only necessary to connect the pipes during calibration. http://yunrun.com.cn/upload/201902/20/201902201704013806.png Note: ◆ A stop valve is connected to the calibration gas inlet of the zirconia detector; this stop valve must be in the closed position at all times other than during calibration. ◆Since this system uses ambient gas as the reference gas, the accuracy of the zirconia oxygen analyzer is affected by the installation location. Example 2 of the zirconia oxygen analyzer system configuration: Example 2 is used to monitor and control the oxygen concentration in the combustion exhaust gases of large boilers and heating furnaces. It consists of a separate zirconia oxygen analyzer, a zirconia detector, a flow rate setting device for manual calibration, gas control valves, a zero-point gas cylinder, a pressure regulator for the gas cylinder, and a calibration gas unit box. Example 2 uses instrument air (clean, dry air containing 21% O2) as the reference gas and the span gas for calibration. The zero gas for calibration is provided by a gas cylinder. Adjust the gas flow rate using a flow control device (manual valve operation). http://yunrun.com.cn/upload/201902/20/201902201718254894.png Example 3 of the system configuration for zirconia oxygen analyzers. Example 3 is used to monitor and control the oxygen concentration in the combustion exhaust gases of large boilers and heating furnaces; it consists of a separate zirconia oxygen analyzer, a zirconia detector, an automatic calibration unit for the separate oxygen analyzer, check valves for the calibration gas pipelines, gas control valves, a zero-point gas cylinder, a pressure regulator for the cylinder, and a calibration gas unit box. Example 3 uses instrument air (clean, dry air containing 21% O2) as the reference gas and the span gas for calibration. The zero gas for calibration is provided by a gas cylinder (an automatic calibration unit is used to allow the calibration gas to flow automatically). By feeding the combustible gas signal into the contact, the power supply to the heater can be stopped. Serves as a purge gas valve switch for the sensor part of the zirconia detector, capable of outputting a linked contact signal). http://yunrun.com.cn/upload/201902/20/201902201726179871.png Note: “*1” indicates a shielded cable (a shielded cable should be used for the signal cable, and this shielded cable should be connected to the FG terminal of the converter) ； “*\"2\" indicates selecting the desired probe from the probe configuration table ； “*3” indicates that when using a zirconia oxygen analyzer, 100% N2 cannot be used as the zero gas; instead, N2 containing about 1% O2 should be used. Source: http://yunrun.com.cn/tech/2378.html