23
Operation at Low Temperatures
At temperatures below –22
°
F (–30
°
C), it
takes somewhat longer for characters to form
on the display. The UltraRadiac automatically
corrects for this by sensing the ambient tem-
perature and increasing the display refresh
time from two to five seconds. Operation of
the UltraRadiac is otherwise unchanged.
Error Displays
Above 500 R/hr (5.0 Sv/h), the upper three-
segment bar (
– – –
) on the display will begin
flashing to indicate that:
•
The dose rate exceeds the range of the
UltraRadiac.
•
The error might be greater than 20%.
•
The value of the displayed dose rate
(and consequently of the calculated
dose) is not accurate.
•
The “true rate” might be significantly
higher than the displayed value.
