calibration cycle

　　Explosion proof zirconia oxygen analyzerThe calibration cycle is usually 1 to 3 months, depending on the usage environment and conditions of the instrument. In harsh environments such as high temperatures, high humidity, or locations with corrosive gases, the calibration cycle may need to be shortened to ensure the accuracy of measurement results. In addition, if the instrument is frequently used or there are abnormal fluctuations in the measured values, calibration should also be carried out in advance.

calibration method

preparation

Check the status of the instrument: Ensure that the instrument is in normal working condition, without errors or warning alarm messages.

Prepare standard gas: Select a suitable concentration of standard gas, usually the zero point gas should be 10% of the full range, and the range gas should be 90% of the full range. For example, a 5% nitrogen oxygen standard gas can be used for calibration.

Prepare calibration tools such as gas generators, pressure regulators, calibration oxygen analyzers, etc.

Calibration steps

Clean the sensor: Use lint free paper or a specialized cleaning cloth to gently wipe the sensor to ensure that its surface is clean and free of dirt.

Check sensor status: Check the appearance of the sensor for signs of damage or corrosion, and replace the sensor immediately if necessary.

Set standard gas: Send the standard gas into the analyzer through a pressure regulator to ensure stable pressure and controlled flow rate within an appropriate range (such as 100-500ml/min).

Perform calibration procedure:

Background automatic calibration: Introduce air and wait for the data to stabilize before entering the background automatic calibration program according to the instrument operation manual. After completion, the oxygen content display should be close to 20.6%.

Automatic calibration of standard gas: Introduce standard gas and wait for the data to stabilize before entering the standard gas automatic calibration program to correct the data to be consistent with the standard gas value.

Data recording and analysis: Record each calibration reading and corresponding standard gas concentration, analyze the data to ensure that the instrument reading is within an acceptable error range.

Adjustment and Calibration: If the instrument reading exceeds the acceptable range, adjust the internal sensor offset or gain, and repeat the calibration procedure until the reading meets the specified error range.

Calibration verification: Use another standard gas or actual gas for verification to ensure the accuracy of the calibrated instrument in practical applications.

Precautions

Standard gas quality: The use of standardized and reliable standard gases is key to ensuring calibration accuracy.

Environmental conditions: During the calibration process, stable environmental conditions such as temperature, humidity, and pressure should be maintained. If there are significant changes in environmental conditions, they should be recorded and corrected.

Gas path inspection: All gas path pipelines entering the instrument must undergo strict leak checks, and a system leak check must be conducted every six months.

Sample gas control pressure: The pressure of the sample gas entering the instrument shall not exceed 0.05MPa, and the output pressure of the secondary gauge of the standard gas shall not exceed 0.30MPa.

Probe protection: Before entering the instrument, the gas path needs to pass through a physical filter (10 μ m). If air resistance is found, the filter screen should be checked.