Our partner AMI

Level Instrumentation

Sensors and controllers from American Magnetics
The sensors and controllers from American Magnetics (AMI) allows to monitor and control the level of liquids and interfaces liquid/liquid in a dewar. Unattended autofill systems for both laboratory and heavier-duty industrial applications are configurable. Features
  • Sensors for: conductive and non-conductive liquids, cryogens, viscous media, liquid/liquid interfaces, bulk solids, powders: He, N, Ne, Xe, O2, H, CO2, natural gas, Ar, GPL, butane, JP4, ethylene glycol, etc.
  • Safety and reliability: FM XP, I.S. & N.I. (C2x) certification
  • Linear, curved, flexible sensors
  • Various output options: Analog 0-10V Recorder output, Analog 4-20mA output, Digital RS-232, RS-422, or IEEE-488 (GPIB) output, LabView drivers are supplied with all digital output options
  • Full automation

Further information

Autofill systems
American Magnetic's extensive experience encompasses the unique requirements for accurately measuring and efficiently controlling cryogenic liquid levels, primarily (but not limited to) nitrogen in unattended auto-fill systems for both laboratory and heavier-duty industrial applications. Depending on the complexity, these systems incorporate either AMI’s Model 186 or Model 286 Liquid Level Controller and associated Liquid Level Sensors into a safe and reliable level control system. Dewar sizes range from "standard" 5 to 50 liters, to the less than 0.25 liter dewars used in IR/CCD detector systems. These are just a few of the many unattended auto-fill applications for systems that need uninterrupted LN2 temperature environments: Crystallography, CCD and HgCdTe Detectors X-ray and Gamma-ray spectroscopy systems, biological sample or single-crystal storage astronomy, fluorescence and chemiluminescence spectroscopy. Gravity-Feed
Gravity-feed systems are an AMI innovation applied in situations where the target dewar must be kept continuously full. In these applications, the source dewar is mounted above the target dewar and is the object of the autofill function.


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Model 188 Liquid-solid level specifications
3.03 MB
Model 175 RF capitance level transmitter specifications
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Cryogenic liquid auto-fill systems specifications


CCD and HgCdTe detectors
X-ray and Gamma-ray spectro-scopy systems
Biological sample or single-crystal storage
Fluorescence and chemiluminescence spectroscopy


Model 188 Liquid-solid level specifications
Model 175 RF capitance level transmitter specifications
Cryogenic liquid auto-fill systems specifications


Dr. Simone Paziani
Dr. Simone Paziani

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Quantum Design s.r.l.

Via Francesco Sapori, 27
00143 Roma

Phone:+39 06 5004204
Fax:+39 06 5010389
Simone PazianiProduct Manager
+39 06 5004204