Fir 1, 2, 3 & 5000
Ion Science Lt d
Ion Science L td
Page 10 of 53
Instrument Functions
_____
Keypad function descriptions
ON/OFF
To switch the Fir instrument 'ON' - Press the 'ON/OFF' key.
To switch the Fir instrument 'OFF' – Firstly, ensure you are on the
DISPLAY/FUNCTION Selection screen, or a DISPLAY screen. Press and hold the 'ON/OFF'
key until the line reaches the left side of the screen, at this point the instrument will
switch off. This procedure has been designed to avoid accidental switch OFF.
ENTER
This key selects options and confirms settings.
ESCAPE
This key is used to return the display to the previous screen and to abort an adjustment.
Repeated pressing of this key will return the display to the 'DISPLAY/FUNCTION selection
screen'.
UP
Use to scroll up, or change selection
DOWN
Use to scroll down or changes selection
ZERO
Zero's the detector when on 'Display Screen' (Only applicable in survey mode, see page
15 for more information).
CAUTION!: Should the Fir instrument be taken from a cold to warm
environment, condensation may form on internal parts of the detector cell. Under these
conditions, prolonged measurement errors may appear as unusually high background
levels, even in a clean air environment. To compensate for this error, press and hold the
ZERO key for at least two seconds.
