Riken Keiki FI-21 Operator's Manual page 6

The Riken Gas Indicator Model FI-21 is a precision gas analyser which is adapted to measure the % volume
concentration of any of the commonly used gas in a mixture of air or oxygen for solvents, fumigation, gas
purity and anaesthetic gas.
The standard instrument is calibrated for eight selectable gas readings on the direct digital display.
The FI-21 operating principle utilises the highly accurate measurement with CCD and Fourier analysis
technology and electronic circuitry to provide direct digital readout.
The FI-21 is equipped with a built-in sample draw pump for ease of use.
This instruction manual is a guidebook how to operate the Model FI-21. Not only beginner users but also
experienced users have to read this manual and start the operation after understanding the contents well.
This instrument is to be used for the purposes listed in this manual and the attached measuring gas
specifications.
For your Safety - the following marks are applied in this manual.
DANGER: It means the matter that causes a serious damage on human beings directly.
WARNING: If the instrument is operated not following by the manual, it causes a serious damage on
human beings or objects.
CAUTION: If the instrument is operated not following by the manual, it causes some damage on human
beings or objects.
NOTE: Manufacturers advisory comment
As the kinds of measurable gas and range are different depending on the type of FI-21, refer to the attached
measuring gas specification. For standard models, refer to the attached "each TYPE measuring gas
specification".