Thermo Miran Sapphire XL Manual 2005 - IE Monitoring Instruments
Thermo Miran Sapphire XL Manual 2005 - IE Monitoring Instruments
Thermo Miran Sapphire XL Manual 2005 - IE Monitoring Instruments
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Chapter 5<br />
ANALYZE/START<br />
To start the analysis, press 1 (Analyze/Start) from the Main Menu. The display presents<br />
the Zero Menu if a zero has been taken for all of the current application wavelengths.<br />
The date and time of the last zero and analyzer status are shown. To re-zero the analyzer,<br />
press 1. To continue with an analysis without taking a new zero value, press ENTER.<br />
Note: If the analyzer has not been recently zeroed, the analyzer skips the Zero Menu<br />
and displays the Analysis menu. See “To Begin Analysis” later in this chapter.<br />
TO ZERO THE ANALYZER<br />
┌────────────────────────────────────────┐<br />
│╒══CURRENT APPLICATION══╕ ZERO MENU │<br />
││ │Last zero: │<br />
││ │ 04Jan01 13:30 │<br />
││ │ │<br />
││ METHANE: ---- ppm │Status: Valid │<br />
││ │ │<br />
││ │ 1=New zero │<br />
│└───────────────────────┘Enter=Continue │<br />
└────────────────────────────────────────┘<br />
Zero Menu<br />
Caution:<br />
1. When zeroing the analyzer, it is important to zero the unit in the area where the<br />
analysis is to take place. This assures that the analyzer is zeroed with air (scrubbed by<br />
the zero gas filter) at the same temperature and humidity as the sample to be analyzed.<br />
2. However, for chemicals such as Butane, Carbon Dioxide, Carbon Monoxide, Ethane,<br />
Methane, Nitrous Oxide, Propane, and Water Vapor, that can not be scrubbed by the zero<br />
gas filter, it is important zero the unit in an area free of the chemical. For example, if<br />
methane is being measured, zero the analyzer in a Methane free area. (Note: typical<br />
atmospheric conditions are 2-3 ppm.) If the analyzer is zeroed in an area containing 7<br />
ppm of Methane, the zero value is set at 7 ppm. All subsequent readings are then<br />
referenced to the 7 ppm baseline value. Thus, if Methane rises to 15 ppm, the analyzer<br />
displays a reading of 8 ppm; if it drops to 3 ppm, the display reads -4 ppm.<br />
3. TEI recommends that the zero gas filter be replaced after 30 zero cycles.<br />
4. The purging of the gas cell during the zero process requires five volumes of air (about<br />
11 liters). The timing supplied in the analyzer's zero routine is ample to allow for this to<br />
happen. However, if there is a restriction in flow that reduces the sample flow rate below<br />
approximately 11 liters/minute or if the sample hose is lengthened, it is possible that the<br />
cell may not be satisfactorily purged under these conditions. If so, repeat the zero<br />
process until sufficient sample has been drawn through the zero filter.<br />
5-1