User`s guide

17
Method of Judgment
Judgment process of the measurement value is described as follows:
① Measurement values of the three gases are compared with 'Cognitive thresholds'. If the value is
above the threshold, ‘+’ is given. If it is below the threshold, ‘-' is given. 'Cognitive threshold' is the
lowest level of concentration where people can identify what kind of smell it is. As there are
differences between individuals in the level of the olfactory sense, it should be regarded as a
“guideline.”
② The combination of ‘+’ and ‘-' is compared with the judgment patterns and the one with the same
combination is the judgment given.
There are seven judgment patterns as follows:
Judgment sentence H2S CH3SH (CH3)2S
Sulphur compounds are not present in this sample.
Breath odours may be present from products other
than sulphur compounds – e.g., lactic or acetic acid.
- - -
Hydrogen sulphide will contribute to breath odour in
amounts close to or over base line.
+ - -
All three sulphur compounds are present.These
compounds, if present in sufficient amounts, will
combine and contribute to breath odour.
+ + + or -
Hydrogen sulphide and dimethyl sulphide, if present in
sufficient amounts, will combine and contribute to
breath odour. r if present in amounts close to or over
baseline.
- + -
Methyl mercaptan can contribute to breath odour if
present in amounts close to or over baseline.
+ - +
Methyl mercaptan and dimethyl sulphide, if present in
sufficient amounts, will combine and contribute to
breath odour.
- + +
Dimethyl sulphide is a cabbage-like odour that bacteria
commonly produce. It can sometimes be digestive in
origin.
- - +
The default 'Cognitive thresholds' and ‘Judgment sentences’ have been specified. The values and contents,
however, can be altered at your discretion.
For the procedures, refer to the ”[Judgment] tab” section in ”System Setting” on page 25.
Printing
Clicking Print button prints the [Judgment] window.
The size and direction of the paper can be set by pressing ‘Page Setup’ button. Please note that the printer
settings specified here are applied to the printing of the [Measure] window and the [Records] window.
Clicking Print button while pressing Shift key on the keyboard saves the [Judgment] window in the form of
a bitmap file.