RSDetection
User’s Manual
March 2016 S131-200-UM Rev A
Page 16
3.4.2 Calibration Check
It is recommended to implement a rapid method of checking the stability of the sensor
calibration. The intent of the checking process is to identify substantial changes in
instrument calibration. The check consists of establishing a reproducible arrangement of a
long half-life isotopic source (e.g. Cs137) and the installed sensor. The increase in the
sensor indication above background due to the check source is proportional to the
sensitivity of the sensor. Any change in this indication is evidence of a change in
calibration. To perform this check an average value for background should first be
computed. This can be done by averaging for about 5 minutes. Note this value and place
the check source in a reproducible location in the center of the chamber. Again average
the readings for about 2 minutes and note this value. By subtracting the background from
the check source value you will obtain the increase due to the source. It is this value that
should be constant if the calibration does not change. If carefully performed this method
should be reproducible to within about 1%.
3.4.3 Optional Battery Replacement
The percent remaining battery capacity may be useful in determining the battery
replacement interval. The Percentage Battery Capacity can be found by referencing the
PercentBatteryCapacity measurement parameter in the Configuration Utility.
A BATTERY WITH A FULL CHARGE CAPACITY OF 11.60AH (NEW) WILL PROVIDE A
NOMINAL 48 HOUR RUN-TIME UNDER NORMAL UNIT OPERATION.
IT IS RECOMMENDED THAT THE BATTERY IS REPLACED WHEN THE REMAINING
BATTERY CAPACITY FALLS BELOW CUSTOMER REQUIREMENTS OR 5 YEARS,
WHICHEVER COMES FIRST.
Follow these steps to remove and replace the battery:
1. Loosen the battery cover screws (Figure 4) using the 9/64” socket or driver. These
are captive and cannot be separated from the cover.
Figure 4 Battery Cover
2. Lift the cover off the case.
3. Remove the battery cover gasket.
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