EPD/HB/40521/
000
ELECTRONIC PERSONAL DOSEMETER HANDBOOK
TECHNICAL DESCRIPTION
ISSUE 5
Page 52
Thermo
4.6.2 Alarm Characteristics:
Alarms: 2 each Hp(10) dose and dose rate alarms
1 each Hp(0.07) dose and dose rate alarms
Dose and Dose Rate Alarms: 0µSv to 16Sv and 0µSv/h to 16µSv/h
resolution V 1/64µSv and 1µSv/h
Recommended minimum settings to avoid
false alarm 7µSv/h Hp(10)/h and 100µSv/h
Hp(0.07)/h
Alarm Types: Audible and visual alarms for dose, dose
rate, count-down timer, read time and failure
mode. Alarms are configurable via the IR
communications link.
Tones: High/low tones, loud/quiet volume in seven
combinations of continuous or fast/slow
intermittent.
Hp(10) Dose Chirp: Settable from 0.01
µSv/chirp to 100
µ
Sv/chirp.
4.6.3 Default Display
The default display is initially factory preset to read Hp (10) (the penetrating or
deep dose), or to an alternative default display as specified by the customer.
User-selected displays have a time-out period, which can be set between 10 to 99
seconds. This time-out is the period of time that any display selected by the user
will stay active before reverting to the default display. The time-out period may be
adjusted via the IR communications link. The default display can be changed to
any of the displays shown in Figure 3.4, again, via the IR communications link.
4.6.4 User Identification
The EPD retains details relating to the current user and the number of times that
the EPD has been issued. Wearer details comprise the user’s identification
number (i.e. the User ID) and the User Name The User Name can be a string of
up to 22 characters. By convention, an un-issued EPD User ID is set to all ‘F’s
(FFFFFFFFFFFF). Typically, a User ID will have fewer than 12 digits, but it must
be an integer between 1 and 999999999999. A full description of User IDs is
given in Sections 3.5.1 and 3.5.2.
User identification can only be set via the IR communications link.
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