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FirstCheck+ 1000, 2000, 3000 & 5000
Instrument Functions
Keypad function descriptions
ON/OFF
To switch the FirstCheck+ instrument ON - Press the ON/OFF key.
To switch the FirstCheck+ 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 change selection
ZERO
Zeros the detector when on Display Screen (Only applicable in survey mode, see
„Instrument Menu‟ for more information).
CAUTION!: Should the FirstCheck+ 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.
Ion Science Ltd
Page 10 of 45
Ion Science Ltd
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