Teledyne API Model T201 NH3 Analyzer Operator Manual | Calibration Procedure |
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| Step No. | Action | Comment |
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| 1. | Press CALZ | The T201 enters the calibrate mode from sample | ||
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| mode. The zero gas is supplied through the ZERO | ||
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| inlet port on the rear panel of the M501 NH3. | ||
| 2 | Table 2.1 | Follow Steps 2 to 8 in Table |
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Notes | Since the zero gas concentration is defined as 0 ppb, it is not necessary | ||||
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| to enter the expected concentration values. |
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Both the TNx and NOx channels must be zeroed individually. When you zero the NOx channel both the offsets for NOx and NO are configured. All readings should display zero following this action.
It is recommended that the calibration of both the TNx and NOx channels be done at one time.
Always confirm that excess zero air is flowing past the sample or zero port, if the Zero/Span option is present, on the rear of the M501 NH3 converter. There should always be some excess flow. If insufficient flow is supplied to the analyzer ambient gas will be entrained and the zero offset values will be incorrect. However, it is important not to over pressurize the analyzer.
It is a good idea to allow the analyzer to sample zero gas for extended periods following zero calibration. Large drifts can signify leaks or indicate an issue with the zero air source.
2.2SPANNING THE ANALYZER WITH NITRIC OXIDE GAS
The analyzer can be spanned by either applying nitric oxide gas straight to the Sample port or through the Zero/Span valve option, if installed. It is important to remember that if the analyzer was previously sampling ammonia gas, prior to conducting a nitric oxide span calibration, it will take some period of time before the TNx channel stabilizes. The process of spanning the analyzer consists of diluting bottled gas, using a calibrator and delivering to the analyzer. The operator then manually spans the TNx and NOx channels individually through the user interface. The following Tables outline the manual steps necessary to span the analyzer.
07271B DCN6646 | 17 |