Version No. 1.0
Page 19 of 51 User Manual STS Safe Series all Equipment 2023 V1.1
The top of the screen now displays the new value set , in this case =50nSv/hr, to exit back
to the menu scroll down to BACK and press Select, this returns you to the main menu. To
start taking readings exit the main menu in the same way to return to the home screen.
Here is a breakdown on each of the menu options:
• Background – This determines the dose rate level when there is no source
present. This is used to create an environment with a constant dose rate
level.
• Alarm – This Alarm determines the dose rate level to which any great
increase in dose rate will trigger an audio alarm. This alarm will have a
frequency of 1 tone every second.
• Sound – This determines the initial audio state of the device upon turning
on.
• BCKL – This determines the initial LCD backlight state of the device upon
turning on.
• Network – This determines the network type of this instrument. There are
two states: Master and Slave. The Master instrument will control the addition of any
new instruments into the Radiation simulation network. There must always be one
Master instrument switched on to control this network. The Slave units do
not have this controlling function, but will join any radiation simulation
networks upon turning on.
(This radiation network technology is common to all SAFE-Series
instruments.)
The Network Status of the instrument is shown upon boot up as shown:
7.3 Maintenance
The Safe-FH40 does not contain any user serviceable parts and as such no repair or
adjustment should be attempted as this will both invalidate the warranty and lead to
potential damage of the circuit.
The batteries are accessed through the cap on the base of the instrument. The Safe-FH40
uses 2 alkaline AA cells, professional or long life cells are recommended for best
performance. Batteries should be removed when not in use for prolonged periods and
partially discharged cells should never be mixed with new cells.
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