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EPD/HB/40521/000

ISSUE 5

EPD TECHNICAL HANDBOOK Page 37

Other values for the dose rate alarm thresholds may be set via the IR

communications link.

Note: To avoid false alarms due to counting statistics it is recommended that the

Hp(0.07)/h dose rate alarm is not set to less than 100µSv/h

Example 1

(10)/h dose rate on

alarm threshold display set at a default

value of 500µSv/h:

'On' and 'Off' alarm thresholds allow hysteresis for dose rate alarms, see section

3.5.1. If hysteresis is not to be used the ‘On’ and ‘Off’ thresholds should be set to the

same value.

Changing the Dose Rate Alarm Thresholds (ON and OFF):

To change the 1

(10)/h dose rate

on alarm threshold, for example,

select the above display and double-

press the button. The display will

change to the following and the digits

will flash:

Alarm Set Limits: 10µSv/h to 1Sv/h

Pressing the button will increase the alarm threshold in the following steps: 10µSv/h,

50µSv/h, 100µSv/h, 500µSv/h, 1mSv/h, 5mSv/h, 10mSv/h, 50mSv/h, 100mSv/h,

500mSv/h, 1.0Sv/h. When the required threshold is reached double-pressing the

button to confirm the value and the flashing display will stop.

If you start to change the threshold and change your mind this option can be aborted,

as follows:

Short-press the button until the

following is displayed (letters

flashing). Double-press the button to

confirm that you wish to escape and

return to the previous alarm threshold.

If the ‘ESC’ screen is displayed and the button is not pressed, after default time-out

the display will return to dose alarm threshold that was being set-up. Again, if the

button is not pressed, the display will return to the top level default screen after a

further time out period.

Thermo EPD Mk2 User Manual

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