EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 20
3.2.2 Dose Alarms
Dose alarms are checked and updated every second, except at low dose rates
where this period increases to a maximum of 14 seconds. Alarms can be adjusted
or inhibited via the IR communications link.
Dose alarms are calculated against a preset alarm threshold set in the EPD. When
the dose equals or exceeds the dose threshold the LED will illuminate, the sounder
will activate and the appropriate alarm flag on the LCD will be displayed. Note that it
is dose and not total dose that is compared with the threshold.
The alarm may be muted by pressing and holding the button, unless alarm mute (user
silence) is inhibited.
The four most significant digits of the alarm thresholds can be viewed on the EPD
LCD and changed using the function button (see Section 3.5.8).
3.2.3 Dose Rate Alarms
Dose rate alarms are checked and updated every second, except at low dose rates
where this period increases to a maximum of 14 seconds. Alarms can be adjusted
or inhibited via the IR communications link.
The dose rate alarms can be made to work with hysteresis, i.e. the alarm 'off'
threshold is lower than the alarm 'on' threshold. The alarm 'off' threshold can be set in
the EPD over the same range as can the alarm 'on' threshold. As the dose rate rises
above the alarm 'on' threshold the LED will flash and the sounder is activated (see
Figure 3.3). The alarm may be muted by pressing and holding the button, unless
alarm mute (user silence) is disabled. The alarm will self-cancel when the dose rate
falls below the alarm 'off' threshold.
To Next Page
Loading...
Need help?
General
