Fir 1, 2, 3 & 5000
Ion Science Lt d
Ion Science L td
Page 22 of 53
Instrument Menu
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Back-light (1, 2, 3 & 5) Note: only adjustable via the Fir PC Software
The instrument display can be illuminated when in low light
conditions. When ON is selected the back-light will remain on
while the instrument is switched on. When OFF is selected
the back-light will remain permanently off. When TIMED is selected the back-light
illuminates for a pre-set time after every key press. When TIMED is selected,
pressing ENTER allows the user to adjust the on time from 1 to 60 seconds.
VOC Gas Selection (1, 2, 3 & 5)
The Fir photo-ionisation detector (PID) is non-selective. Although
many VOC gases are detectable, the Fir PID cannot differentiate
between the gases. When you select the VOC gas you wish to measure from
the Fir internal gas list, the instrument will calculate the equivalent
level for that selected gas against an isobutylene calibration. Please note that there may be other
detectable gases present that may effect the measurement.
WARNING!: Ion Science makes every effort to ensure the gas tables held within the Fir memory
and supplied on CD are accurate at the time of manufacture. In critical applications alarm levels must be
checked, compared and adjusted to local legislation before use.
CUSTOM offers a quick route to the last 5 selected gases. When selected, use the UP
and DOWN keys to change the gas then press ENTER to select.
LIST allows selection of any gas from within the gas table held in the
Fir memory.
After selecting the LIST symbol, select the first letter of the gas you wish to select and
press ENTER. The Fir will then list all gases starting with that letter. WMD
gases are prefixed with the letters WMD.
Alarm levels that are set in the Gas table will be automatically selected. Should a gas be
selected that is not compatible with the selected lamp, the following symbol will appear
to highlight the incompatibility.
Custom List
On Off Timed
Custom List
