S.E. International Radiation alert Monitor 1000 EC Operation Manual - page 8
8
Autoranging
When radiation levels increase in some modes over certain preset levels, the Monitor 1000
EC
uses autoranging,
automatically changing from CPM to KCPM or from µR/hr to mR/hr.
Operating in Dose/Rate Modes
Caution: Be sure there is no obstruction between the detector window and the source being monitored/
surveyed. Avoid making measurements with the GM window facing the sun, as it could affect your readings.
At low count rates, significant changes in the radiation level displayed can take up to 30 seconds to stabilize
when set to auto-ranging. See Autoaveraging.
CPM, CPS, and Total counts are the most direct methods of measurement.
µR/hr, mR/hr and µSv/hr are calculated using a conversion factor optimized for Cesium-137. This mode is
less accurate for radionuclides other than Cs-137, unless you have calibrated the instrument for the specific
radionuclide you are surveying.
The most immediate indicators of the radiation level are the audio indicator and count light.
Using The Alarm
The Alarm can be set in dose or rate modes using the currently selected unit of measurement. Once the alarm
threshold is reached, the beeper will sound and the alert icon (radiation symbol) will flash until the alarm is
deactivated, or the radiation level drops below the set alarm threshold.
1. To set the alarm, press the alarm button. The SET ALARM screen will be displayed.
2. Use the + or - buttons to increase or decrease the desired alarm level.
3. Once you have set the alarm to the desired level, press the enter button to retain the setting into
memory and activate the alarm. The alarm icon (bell icon) is now displayed to indicate the alarm is active.
4. Once the alarm is triggered, press the alarm button to mute the alarm. The alert icon (radiation
symbol) will remain flashing until the radiation level falls below the set alarm level.
5. To deactivate the alarm mode, press the alarm button, then the enter button.
The alarm icon is no longer shown at the top of the display.
Using the Data Logging Feature
It is not necessary to set the internal clock to start collecting data to memory, but it is recommended to
properly time stamp the data collection on your device to ensure the correct time and date in your collected
readings. You will need a copy of the Observer USB Software to set the internal clock. The latest version is
available at seintl.com/software. See Chapter 6: Observer USB Software. The internal clock of the Monitor
1000
EC
can be set to the date and time on a PC running the Observer USB Software by clicking Functions
> Synchronize Monitor 1000
EC
to PC Clock. The Monitor 1000
EC
will beep twice once synchronization has
completed.
Once the time has been set, you can activate the data logging via the Observer USB Software or via the menu
button on the Monitor 1000
EC
. To activate it on the instrument, press Menu > Data Logging, then enter and
follow the on screen prompts. The default data logging frequency is 1 minute. You can change the frequency
in the Cal Panel window of the Observer USB Software. There is enough on-board memory for a data logging
frequency of 1 minute to record for 90 hours. A data logging frequency of 10 minutes can record for 888 hours.
See Chapter 6: Observer USB Software.