EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 57
Alarm thresholds are set via the IR communications link, or by the button if the user is
granted authority (see Figure 3.4), to any value in the following ranges:
1
st
& 2
nd
Hp(10)/h
0µSv/h to 16.777215 Sv/h
Hp(0.07)/h 0µSv/h to 16.777215 Sv/h
1
st
& 2
nd
Hp(10) 1µSv to 16.777215 Sv
Hp(0.07) 1µSv to 16.777215 Sv
It is not recommended to set dose rate alarms to less than 7uSv/h (Hp10)/h or
100µSv/h Hp(0.07)/h as the statistical errors on the dose rate reading at these levels
will be greater than ±50%, and false alarms may occur in normal background
radiation conditions.
4.6.9 EPD Operating Status
The EPD retains information regarding its status. EPD status can only be read via
the IR communications link. Status information provided is:
♦ EPD Run Times
♦ EPD State
♦ Alarms
♦ Warnings
♦ Faults
♦ Event history
EPD ‘Run’ and Off times
The EPD contains an accurate clock (±30 ppm) and records the elapsed time, both
for operating (Run Time) and in ‘OFF’ Mode. Times are recorded to a resolution of 1
second. The OFF time is the number of seconds that the detectors have been
switched off (while the power has been present).
Note: When power is removed, or a reset occurs, the EPD clock reverts to a value
of up to 15 minutes prior to its value on power loss or reset.
EPD State
The EPD retains a record of the following information:
1. Issue Count. This is the number of times the EPD has been issued.
2. Issued. This is the present state of the issued flag, either EPD
Issued or EPD Not Issued.
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