In this article, we detail how to check MRI liquid helium levels. The procedures below apply to the legacy liquid helium level meter and newer magnet monitor units.
Important note: Regularly monitoring helium levels is crucial to prevent accidental quench. Maintain levels above 60%. If helium level falls below threshold, contact a service engineer promptly. Follow these steps for helium level check:
How To Check MRI Liquid Helium Levels
Method 1: Systems with Magnet Monitor
This procedure describes how to sample MRI liquid helium levels for systems with magnet monitors.
Step 1: Locate magnet monitor in the MRI equipment room.
The magnet monitor is a gray unit (with multiple cables) mounted on the wall of the MRI equipment room.
Step 2: Sample MRI liquid helium reading.
Push the update (sample) button on the magnet monitor unit and keep it pressed for 10 seconds. An updated helium reading will be displayed on the LED display.
Step 3: Record values in daily logbook.
Record MRI liquid helium level, magnet pressure and essential cryostat readings. It is essential to keep reliable records to help isolate and troubleshoot cryogenic system issues.
Method 2: Systems with MRI liquid helium level meter
Time needed: 1 minute
This procedure describes how to sample MRI liquid helium readings on legacy helium level meters.
- Turn on the MRI liquid helium meter.
Locate the helium meter at the front of systems cabinet. Flip the power switch up to the on position.
- Press Update for new reading.
Liquid helium meter updates with new reading after 10 seconds.
- Log readings.
Keep a daily log of liquid helium, magnet pressure, and all essential cryostat readings.
- Power off helium meter when done.
Deactivate unit after logging readings to avoid signal interference.
Conclusion
Vigilance in monitoring and maintaining proper helium levels is paramount for the safe and efficient operation of cryogenic systems. By following these streamlined procedures, you can ensure that helium levels are consistently within the acceptable range, reducing the risk of unforeseen quenches and ensuring the longevity of your equipment. We hope this article was helpful. You can find related resources below. Also, consider subscribing to our newsletter if you are interested in similar content. Thank you for your support!
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