Installation | Model 7500ZA | |
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3.4 Sampling
3.4.1Sample Gas Conditioning
1.Dust from the sampling gas should be completely removed using a filter. For the final stage filter, use a filter that removes dust particles down to 0.3µm.
2.Dew point must be lower than the ambient temperature. If vapor is contained in the sample, dew point should be lowered to 2°C using a dehumidifier.
3.If SO3 mist is present in the sample gas, use a mist filter or cooler to remove the SO3 mist. Other mists should be removed using a mist filter or gas dryer.
4.Corrosive gases such as Cl2, F2 and HCl, if present in considerable amounts, will shorten the life of component parts.
5.Sample gas temperature should be within 0 to 50°C. Do not flow hot gas directly into the instrument.
3.4.2Sample Gas Flow
Sample flow should be 0.5L/min ± 0.2L/min. Avoid any flow fluctuation during measurement. Observe the flow reading using the flowmeter provided as shown in the example of the sampling system configuration (Item 3.4.6).
3.4.3 Preparation of Standard Gas
Routine calibration is required once a week using span and zero calibration gases to keep the instrument performing optimally. Prepare a standard gas cylinder for zero calibration and span calibration per the table below.
| Without O2 | External O2 | ||
| Sensor | Sensor | Sensor | |
Zero Gas | N2 | N2 | Dry air | |
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| (O2 of 99.9 to 100 |
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| vol% for reverse |
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| range O2 |
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| measurement.) |
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Span gas other | Gas with | Gas with | Gas with | |
concentration | concentration of | concentration of | ||
than for O2 | ||||
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Teledyne Analytical Instruments | 12 |
