ELECTRONIC PERSONAL DOSEMETER HANDBOOK
EPD/HB/40521/000
OPERATING INSTRUCTIONS
ISSUE 5
Thermo
Page 21
Figure 3.3 - Dose Rate Alarm Example
The four most significant digits of the alarm ‘Off’ and the alarm 'On' thresholds can
be viewed on the EPD LCD and, if user has authority to modify the thresholds,
changed using the function button (see Section 3.5.9).
3.2.4 Over-Range Indication
If a dose rate exceeds 1Sv/h, or if a dose store increments above 1.0Sv, an over-
range alarm will occur. The sounder (if enabled) will sound and the LED will flash
(if enabled). The over-range alarm will also cause the LCD display to flash every
second.
Notes
:
1. The over-range alarm condition is latched and the LCD will continue to
flash even after a temporary dose-rate over-range condition has cleared.
The over-range conditions are recorded in the EPD EEPROM and must be
cleared over the IR communications link before the display will stop
flashing.
2. The over-range alarm can be muted ( if enabled ). The EPD audible and
Led alarm will not recur after muting should over-range conditions re-occur
(e.g. in the case of a second dose-rate over-range alarm ), until the latched
condition has been cleared over the IR communications link. However the
LCD will continue to flash.
3. For software version 11 and later EPDs the over-range indication on the
LCD may be configured to operate in either of two ways. By default the
LCD will alternate between the current display selection and a blank
display. The alternative configuration causes the LCD to alternate between
the current display selection and 9999.
4. The ADS dose over-range alarm only operates if the unit is ADS issued.
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