38 MN1007-C
2. Select units.
Using the Mode
key, cycle through the various options associated with each probe type. For the SA-50
scintillation probe the options are:
Cps
Cps with background subtracted
µSv/h
µSv/h with background subtracted
3. Press Rate/Int./Stop
key.
This will start the measurement as indicated by the flashing amber LED.
The instrument will complete the measurement once the pre-set integration period has elapsed [See Section 5
Setting Integration Period.]
The user may also interrupt this measurement by pressing the Rate/Int/Stop
key.
4. Red LED flashes. The measurement is complete.
The measurement will continue to be displayed until the user presses the Rate/Int/Stop
key.
The instrument will now return to a live real-time display as indicated by the flashing green LED.
5. If at the end of the integration period the alarm level is exceeded, then all three indicator LEDs will flash in
unison and the sounder will be activated.
Removing the source of radiation will clear the sounder but the LEDs will continue to flash until the user
presses the Rate/Int./Stop
key to return to rate mode.
[This operation is summarised in Section 4.6 Alarm activation in Integration Mode]
Note that the alarm operation in Integration mode is different from that in rate mode in which case the
alarm is activated immediately after levels are exceeded.
Note: the background count is stored in non-volatile memory so that the reading is retained even if the
instrument is switched off.
The operator is responsible for ensuring the background measurement is kept current and therefore applicable
to the measurement in hand. The site RPA (or deputy) will advise on frequency and location of background
radiation measurements
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General