Advanced Instruments 4250, Руководство пользователя

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Advanced
®
Cryoscope Model 4250 User’s Guide
8
6. Press the STOP key a second time to exit from the test menu to
“ Press START to Continue ” .
Step 8 — Run a diagnostic test
With a sample tube containing fluid such as a calibration standard or
deionized water in the freezing chamber, press the START key. The
microprocessor will respond with the display, “ Running Diagnostics ” ,
while it lowers the operating head, cools the freezing chamber and com-
pletes a series of internal diagnostic checks. If the diagnostic checks are
not successfully completed or the freezing chamber does not cool prop-
erly, a diagnostic message will be presented.
NOTE Any error reported prior to or during diagnostics will require
the operator to press STOP before any of the keyboard com-
mands can be used.
Primer Pump
Fluid Return
Tube
Figure 4: Prime the Heat Transfer Fluid Pump