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MEASUREMENT/CALIBRATION/SWITCHING (SHUT) OFF
90002929(6) NGA-MLT e 30.10.99
Rosemount Analytical
7. Measurement / Calibration / Switching (Shut) Off
7.1 Measurement
The primary step in the measurement of the concentration of a gas component is the admission
of sample gas to the analyzer.
Analyzer needs 15 to 50 minutes to warm-up after switch on,
depending on the installed detectors (thermostat controlled temperature) !
❍ Admit sample gas at the respective gas inlet fitting (see Item 5.).
❍ Set the gas flow rate to allowable rate.
Before starting an analysis, however, the following should be performed:
❏ BINOS E front panel program should be installed and BINOS E should be connected to
the designated COM port. Initialization from connected analyzer or from configuration file
should have been carried out.
❏ Zero and span gas calibration of the BINOS E (see chapter 8).
Note for analyzers with electrochemical O
2
cell!
Depending on measuring principle the electrochemical O
2
cell needs a minimum internal consumption
of oxygen (residual humidity avoids drying of the cell). Supply cells continuously with dry sample gas
of low grade oxygen concentration or with oxygenfree sample gas could result a reversible detuning
of O
2
sensitivity. The output signal will become unstable.
For correct measurement the cells have to be supplied with O
2
concentrations of at least 0.1 Vol.-%.
We recommend to use the cells in intervall measurement (purge cells with conditioned (dust removal
but no drying) ambient air during measurement breaks).
If it is necessary to interrupt oxygen supply for several hours or days, the cell has to regenerate (supply
cell for about one day with ambient air). Temporary flushing with nitrogen (N
2
) for less than 1 h (e.g.
analyzer zeroing) will have no influence to measuring value.
MEASUREMENT