EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 22
3.2.5 Alarm Muting
Alarm conditions cause the sounder to be activated and the alarm LED to illuminate,
subject to these facilities being enabled for the alarm. The appropriate LCD alarm
flag is always activated. The user can silence ( mute ) the alarm by pressing and
holding the button, provided mute is enabled on the alarm. This will also extinguish
the Alarm LED. However the LCD alarm flag remains set until such time as the
alarm condition is cleared.
Dose rate alarms are self muting when the dose rate falls below the alarm ‘off’
threshold level. Similarly dose alarms are self muting if the dose is cleared or the
thresholds suitably increased over the IR communications link.
Note that if the display backlight is enabled a short press of the button turns the back-
light on and temporarily silences any active alarm. This is because the EPD unit
battery cannot supply sufficient current for both backlight and sounder together. After
the display timeout period the backlight is automatically turned off and the sounder
re-enabled. Thus a short press may appear to mute the alarm and confuse the user
under such conditions. It is necessary therefore for the user to remember that a long
press is required to mute the alarm.
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