What to do if the magnet system does not reach specification on Bruker 700'54 Ascend?
If the magnet system does not reach specification in your Bruker Laboratory Equipment, it could be due to magnetic material inside the RT bore tube; carefully clean the RT bore tube. Large ferromagnetic parts near the magnet system can also cause this; keep all ferromagnetic parts away from the magnet system as much as possible and repeat shimming.
What to do if the helium flow system becomes very cold and icy during flushing with helium gas on Bruker 700'54 Ascend?
If the helium flow system of your Bruker Laboratory Equipment becomes very cold and icy during flushing with helium gas, it is likely that liquid nitrogen remains in the helium vessel, boiling off strongly during flushing. Stop flushing, carefully remove all liquid nitrogen using the precooling tube, and use the dipstick to check that the helium vessel is empty (no liquid nitrogen or frozen nitrogen).
What to do if the zero reading of the Helium Level Sensor cannot be adjusted at the beginning of cooling with liquid helium on Bruker 700'54 Ascend Laboratory Equipment?
If the zero reading of the Helium Level Sensor cannot be adjusted at the beginning of cooling with liquid helium in your Bruker Laboratory Equipment, check the connection in the helium fill-in turret between the Helium Level Sensor and the connector. If the connection is correct, the Helium Level Sensor may be defective; check it using the 0 % calibration plug.
What to do if the pneumatic isolator of the magnet stand does not reach the operating position on Bruker 700'54 Ascend?
If the pneumatic isolator of the magnet stand for your Bruker Laboratory Equipment does not reach the operating position, ensure the pneumatic controller is in the UP position. Check the pressure of the gas supply, which must be in the range of 5 to 8 bar (70 to 112 psi). Stop the pneumatic isolators and check the level of the cryostat if the magnet system is not level. Finally, the leveling valve or membrane of an isolator may be defective, requiring replacement of the leveling valve or isolator.
What to do if the vacuum in RT vessel of Bruker 700'54 Ascend Laboratory Equipment does not reach 5 x 10-5 mbar within 48 hours?
If the vacuum in the RT vessel of your Bruker Laboratory Equipment does not reach 5 x 10-5 mbar within 48 hours, it could be due to several reasons. The O-rings might be damaged, so check and clean them, replacing if necessary those for the vacuum valve, drop-off plate, reduction and sealing flanges, and the bottom plate. Also, the pumping unit or pumping line could be defective; verify they can reach at least 10-6 mbar with the sealing plug closed, and replace if needed. Scratches or dust on the RT bore sealing surfaces can also cause this, so inspect and clean them. Finally, moisture in the RT vessel can be a culprit; use dry N2 gas to pump and flush the vessel.
What to do if there is nitrogen ice in the helium vessel of Bruker Laboratory Equipment?
If nitrogen ice is present in the helium vessel of your Bruker Laboratory Equipment, it is likely due to the times between pumping and flushing being too long, where nitrogen boiled off during pumping and remaining nitrogen got frozen during flushing. Warm the magnet coil with warm helium gas using the precooling tube until the whole coil is at 90 K or above, repeat pumping and flushing, and use the dipstick to check that the helium vessel is empty (no liquid nitrogen or frozen nitrogen).
What to do if the current lead cannot be removed from Bruker Laboratory Equipment?
If you cannot remove the current lead from your Bruker Laboratory Equipment, it is likely that the connector is covered with ice (frozen moisture or nitrogen ice). Carefully remove the ice with warm helium gas over the helium flow system, using the dipstick or the precooling tube as tubing to remove small ice spots from the connector.
What to do if RT vessel of Bruker 700'54 Ascend Laboratory Equipment becomes cold and wet?
If the RT vessel of your Bruker Laboratory Equipment becomes cold and wet, it could be due to a broken vacuum or a vacuum less than 10-3 mbar. Keep the pumping unit connected until filling with liquid helium is finished and continue as in problem Vacuum in RT vessel does not reach 10-6 mbar. Another cause could be a cold leak after transportation. In this case, stop cooling and warm the cryostat.
What to do if the helium boil off is too high in Bruker Laboratory Equipment?
If the helium boil off is too high in your Bruker Laboratory Equipment, it could be because the Helium Level Sensor is in service mode or has been used too often; switch off the Helium Level Sensor and reduce the frequency of helium level measurement. The atmospheric pressure might be decreasing, which is usual behavior, so check the helium boil off daily. Reduced vacuum can also cause this; rebuild the vacuum. Additionally, the radiation baffles might not be inserted in the current lead turret; insert the radiation baffles into the current lead turret.
What to do if the helium boil off decreases to zero in Bruker 700'54 Ascend?
If the helium boil off decreases to zero in your Bruker Laboratory Equipment, it could be due to increasing atmospheric pressure, which is usual behavior, so check the helium boil off daily. If the helium flow system is covered with ice, contact Bruker Service immediately and do not try to remove the ice yourself. If the helium flow system or suspension tubes are blocked with ice, flush warm helium gas through an applicable tube, but do not insert the tube more than 600 mm from the top of the helium turrets.
General| Brand | Bruker |
|---|---|
| Model | 700'54 Ascend |
| Category | Laboratory Equipment |
| Language | English |
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