LHe level measuring instrument

With this device liquid helium levels in cryogenic containers up to 1,370 mm are displayed linearly. Several probes with different measuring lengths are available. The measuring device is adjusted to the desired measuring range at the factory.

Substance
Temperature
Scope of application

Precise level measurement for liquid helium

With this device liquid helium levels in cryo containers up to 1.370 mm are displayed linearly. Several probes with different measuring lengths are available. The measuring instrument is adjusted to the requested measuring range in the factory.
Due to a built-in rechargeable battery, the levels can be measured at any time, even in mobile applications. A charger, which can also be used as a power supply unit, is included. Connection options for a remote display and a recorder complete the package.
The device switches off automatically after max. 60 sec.

The measuring principle
The superconductor of the probe has a so-called transition temperature in the boiling range of helium, at which its electrical resistance becomes infinitely small. A constant current creates a voltage drop across the residual resistance, corresponding to the probe section not immersed in the cryo liquid. This voltage is displayed via a measuring bridge, which thus becomes a measure for the filling level.

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Convincing advantages:

  • Modular structure
  • fast assembly
  • Easy operation
  • Arrangement at any point in the pipe system
  • Life expectancy: 30 years
  • level measurement self-monitoring, as the sensors are monitored for wire breakage

Technical data of
the LHe level meter:

display unitprobe
Digital displayrod probes with connection Ø12 mm for installation . via compression fitting
1 Measuring range calibrated with associated probeKF 32 or KF 50 intermediate piece for installation between tank and safety attachment
function selection via 2 keys (On, Heating)Probe current 80 mA / 100 mA
function displays for "probe not closed" 
and "Low Battery"
Probe length from 500 to 2000 mm
Connection books for power supply unit, probe, etc. Recorder output voltage (0-1 V),
Recorder output Current (0-10 mA)
Active measuring length from 450 to 1370 mm
Power supply via built-in accumulator 
12 V / 1.1 AH or external power supply unit 12 V / 400 mA
 
Power consumption approx. 4 W 
Plastic housing (H x W x D): 67 x 148 x 190 mm 

*For stationary containers also available as 19" version. Special designs on request.

Certificates

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LHe level measuring instrument

With this device liquid helium levels in cryogenic containers up to 1,370 mm are displayed linearly. Several probes with different measuring lengths are available. The measuring device is adjusted to the desired measuring range at the factory.