How to Calibrate the GE XMTC6211 Hydrogen Analyzer in Oxygen?
Many customers working in hydrogen plants at power stations have purchased the GE XMTC6211 thermal hydrogen analyzer to measure hydrogen concentration in oxygen. The typical range for this device is 0–5% or 0–2%. However, some users are unsure how to properly calibrate the instrument. One of the main challenges is that it can be difficult to find a gas mixture with exactly 2% or 5% hydrogen in oxygen for calibration. In reality, when the device is calibrated in the factory, it's often done using a standard gas with 3.5% hydrogen in nitrogen. This is because nitrogen is safer and more readily available than oxygen. Below is an example of a factory calibration report. During calibration, a 3.5% hydrogen in nitrogen gas was used, and the thermal bridge output was found to correspond to 1.87% hydrogen in oxygen. Therefore, for future recalibration, you should use the same 3.5% hydrogen in nitrogen as the reference gas. There are two common methods to verify the performance of the XMTC6211 hydrogen analyzer.
Method 1: Use PanaView or IDM software to adjust the full-scale range of the instrument to 1.87% oxygen. Save the settings, then introduce the 3.5% hydrogen in nitrogen gas. Once the instrument stabilizes, switch the S3 dial switch on the device to the "Span" position. Press and hold the S1 button for 20 seconds. After verification, return the range setting back to its original value.
Method 2: Connect the ammeter in series with the 4–20mA output of the analyzer. Observe the current output when the 3.5% hydrogen in nitrogen gas is introduced. If the output isn't 18.95mA (as stated in the calibration report), use PanaView or IDM software to adjust the signal to 18.95mA.
Calibration Steps for the Secondary Meter:
1. Introduce zero gas into the secondary meter calibration menu. Wait until the output current stabilizes, then input the measured current value into the corresponding window for the zero gas.
2. Introduce the span gas into the calibration menu. Once the instrument output stabilizes, enter the measured current value into the window designated for the span gas.
For detailed guidance on calibration and maintenance, please contact Tianjin Xinqi Energy Technology Co., Ltd. – GE Barna Instrument Division. Phone: 022-88322132 | Mobile: 13512483205
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Shenzhen Jiesaiyuan Electricity Co., Ltd. , https://www.gootuenergy.com