MOBILETT Plus/ Plus E Register 6 SPR8-215.850.02 Page 2 of 2 Siemens-Elema AB
Rev. 01 01.02 SPS-UD Solna, Sweden
17 - 2 Tube-loading calculation
The actual cooling curve is somewhat steeper than the calculated one.
If, following the last exposure, the calculated anode-plate heat energy is larger than 67 %
of the permissible thermal loading in HU, a new exposure is not allowed. Then the green
”ready” LED on the Control and display panel is turned on again, allowing a new expo-
sure, only after the calculated anode-plate heat energy is again below the limiting value of
67%.
This ensures that the thermal loading will never exceed 80%.
A special algorithm in the microprocessor software ensures that:
1. the maximum anode-plate heat energy can never become larger than 67 % of the
permissible thermal loading in HU + the maximum increase in thermal loading
from an exposure and
2. the mean X-ray tube power can not exceed 73 W during one hour.
To be able to calculate the cooling curve, the
MOBILETT must be switched on.
This means that if the MOBILETT, during the day has
been used for a large numbers of exposures, the oper-
ator must leave the device turned on for 10 to 20 min-
utes so that the HU-memory can be emptied.
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