Difference between revisions of "Cryogen Liquid Level Monitors"

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The liquid nitrogen level meter probe is a  Magnex Scientific E5031. The probe is a continuous analog readout of the liquid nitrogen level. The active sensor area of the probe is approximately 1 meter. Read-out of the probe is done via a "hockey-puck" like attachment that screws into the top of the ~1m long probe rod. The probe is calibrated using a combination of a Zero offset adjustment on the hockey-puck and Gain adjustment on the back of the analog read-out. Typically the meter is calibrated using a known liquid level. The ammonia sample dewar is a good place to calibrate the liquid level if you think it is off. We usually only use the meter as a rough estimate of the liquid level so the calibration doesn't have to be super precise.
 
The liquid nitrogen level meter probe is a  Magnex Scientific E5031. The probe is a continuous analog readout of the liquid nitrogen level. The active sensor area of the probe is approximately 1 meter. Read-out of the probe is done via a "hockey-puck" like attachment that screws into the top of the ~1m long probe rod. The probe is calibrated using a combination of a Zero offset adjustment on the hockey-puck and Gain adjustment on the back of the analog read-out. Typically the meter is calibrated using a known liquid level. The ammonia sample dewar is a good place to calibrate the liquid level if you think it is off. We usually only use the meter as a rough estimate of the liquid level so the calibration doesn't have to be super precise.
  
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Description of images (starting top left and working clockwise):
  
[[Image:FrontofLevelMeters.jpg]]
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*1. Front of the Magnex Scientific LN2 Liquid Level and AMI Model 135 Liquid Helium Level Monitor. We currently do not use the Magnex E5011 Monitor.
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*2. Back of the Magnex Scientific LN2 Liquid Level and AMI Model 135 Liquid Helium Level Monitor. The gain for the LN2 monitor is adjusted using a small screw driver. The cable labeled LHe J1 for the AMI sensor originates in the 35 pin connector on top of the blue AMI magnet dewar.
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*3. The hockey puck attachment for the E5031 LN2 probe. The puck is attached to the probe rod in this picture.
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*4. The LN2 probe cable that attaches to the base of the hockey puck.
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*5. The LN2 probe cable that attaches to the back of the read-out electronics.
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*6. The zero offset adjustment on the hockey puck. This is changed with a small screw driver.
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[[Image:FrontofLevelMeters.jpg|400px]] [[Image:BackofLevelMeters.jpg|400px]] [[Image:HockeyPuck.jpg|400px]]
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[[Image:LN2Cable_2.jpg|400px]] [[Image:LN2Cable.jpg|400px]] [[Image:ZeroAdjust.jpg|400px]]
  
 
== LHe Level Meter: ==
 
== LHe Level Meter: ==

Latest revision as of 15:45, 27 January 2017

LN2 Level Meter:

The liquid nitrogen level meter probe is a Magnex Scientific E5031. The probe is a continuous analog readout of the liquid nitrogen level. The active sensor area of the probe is approximately 1 meter. Read-out of the probe is done via a "hockey-puck" like attachment that screws into the top of the ~1m long probe rod. The probe is calibrated using a combination of a Zero offset adjustment on the hockey-puck and Gain adjustment on the back of the analog read-out. Typically the meter is calibrated using a known liquid level. The ammonia sample dewar is a good place to calibrate the liquid level if you think it is off. We usually only use the meter as a rough estimate of the liquid level so the calibration doesn't have to be super precise.

Description of images (starting top left and working clockwise):

  • 1. Front of the Magnex Scientific LN2 Liquid Level and AMI Model 135 Liquid Helium Level Monitor. We currently do not use the Magnex E5011 Monitor.
  • 2. Back of the Magnex Scientific LN2 Liquid Level and AMI Model 135 Liquid Helium Level Monitor. The gain for the LN2 monitor is adjusted using a small screw driver. The cable labeled LHe J1 for the AMI sensor originates in the 35 pin connector on top of the blue AMI magnet dewar.
  • 3. The hockey puck attachment for the E5031 LN2 probe. The puck is attached to the probe rod in this picture.
  • 4. The LN2 probe cable that attaches to the base of the hockey puck.
  • 5. The LN2 probe cable that attaches to the back of the read-out electronics.
  • 6. The zero offset adjustment on the hockey puck. This is changed with a small screw driver.

FrontofLevelMeters.jpg BackofLevelMeters.jpg HockeyPuck.jpg LN2Cable 2.jpg LN2Cable.jpg ZeroAdjust.jpg

LHe Level Meter: