Advanced Instruments 4250, User Manual

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Advanced
®
Cryoscope Model 4250 User’s Guide
70
“Head Not Up”
“Insufficient Data”
Low Battery
Low Fluid Level in
Freezing Chamber
“Memory Allocation
Error”
“No Parameters in
RAM”
This error indicates that the sensor at the head
up position was not tripped. Clear any block-
age and try restarting your instrument. If this
does not solve your problem, contact
Advanced Instruments for Hot-Line Service.
This message indicates that not enough valid
test results exist in memory for calculating the
requested statistics.
The lithium battery contained inside the
NVRAM memory is too low to maintain
stored information, calibration, and system
settings. The instrument will function normal-
ly as long as the main power remains on.
Contact Advanced Instruments for Hot-Line
Service.
The heat transfer fluid pump may be malfunc-
tioning, or there may be a leak or obstruction
in the fluid system. Run the Head Up/Down
Test while observing the priming of the heat
transfer fluid pump and the flow of fluid into
and out of the freezing chamber. If leakage or
an obstruction is suspected, contact Advanced
Instruments for Hot-Line Service.
Turn unit off and on. If the error message
does not persist and no other message is dis-
played, ignore this message. If the error per-
sists, contact Advanced Instruments for Hot-
Line Service.
Error is self-correcting. This will restore
default settings. Custom settings and probe
bin numbers will need to be reset. If the error
persists, contact Advanced Instruments for
Hot-Line Service.