68 (93) BRUKER CryoProbe Installation
Troubleshooting
NOTE: Do not try to fill the He Compressor directly from the He steel-cylinder (i.e.
at its backside H
ELIUM GAS CHARGE port), it should be charged via the CryoCool-
ing Unit.
Table 5.2. Refill He
step action
f.1 To prevent errors due to other causes, the CryoProbe System should be
ready for a cool-down in all other respects.
Check if the
1) cooling water supply is active (if applicable);
2) He steel-cylinder is connected and open. Its primary pressure
must be larger than 40 bar and its secondary pressure stable at
22-25 bar;
3) CryoProbe is properly installed and connected;
4) CryoCooling Unit is O
N while WARM and unplug indicate that the
unit is ready;
5) He Compressor M
AIN POWER SW at its backside and DRIVE at its
front are O
N.
f.2 Start C
OOL DOWN and wait until it stops with an ERROR.
f.3 Enter the password-protected Service mode of the CryoTool and click
debug HALT - Yes.
f.4 Close the He Regulator.
f.5 In the CryoTool, close V1, V2, V3, V4 and V8.
f.6 Open V6 and V7.
f.7 Open V5.
f.8 Now the timing is important:
Open the He Regulator slowly in small increments such that the HE-
Supp. and the HE-Ret. readings in the CryoTool approach 17.5 ± 0.3 bar
slowly. As soon as one of them shows 17.5 bar, close V5 immediately.
NOTE: The gauge on the He Regulator is of less concern but it must not
exceed 25 bar at any time.
f.9 Exit the Service mode.
f.10 Switch the CryoCooling Unit at its front O
FF, then ON.
The system now ready for a normal C
OOL DOWN.
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