EPD/HB/40521/
000
ELECTRONIC PERSONAL DOSEMETER HANDBOOK
TECHNICAL DESCRIPTION
ISSUE 5
Page 50
Thermo
2) PTB APPROVED EPD
The Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin,
is the national institute of natural and engineering sciences and the highest
technical authority for metrology and physical safety engineering of the Federal
Republic of Germany.
EPDs supplied to Germany and elsewhere under PTB approval are specially
configured by the manufacturer to ensure certain functions cannot be enabled,
as follows:
Alarm Configuration
Alarms cannot be configured Off, be disabled, set to quiet or low frequency.
This ensures that Alarm sound level is >85dB(A) at 30cm from the EPD. The
alarm times cannot be set to less than 10 minutes.
The following Alarm Control settings may also not be changed from the factory
configuration: Battery alarm level 1, Battery Alarm Level 2, Battery Type
Discriminator, Regulated voltage alarm level.
LCD, Decimal Point position and display units.
PTB EPDs are configured such that the settings for decimal places, dose units,
off display, wearer display, overrange flashing, and 1 minute logging, cannot be
changed.
EPDs are factory configured to the required Display Settings and then 'locked'
in that condition. This configuration is required for PTB approved EPDs.
Calibration Factors
Beta/Gamma EPDs are supplied with calibration factors locked.
Any attempt to configure PTB Approved EPDs contrary to this specification will
fail. If the configuration is attempted using EasyEPD2 then EasyEPD2 will
display gives the error message 2 28.
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