Liquid Helium Level Sensors
Cryomagnetics’ Line of Superconducting Liquid Helium Level Sensors offer low liquid helium consumption and proper venting in any mounting orientation. Cryomagnetics’ level sensors are compatible for use with all Cryomagnetics’ liquid helium level instruments including the Model LM-510 Liquid Cryogen Monitor. Standard sensors are available in three different outside diameter sizes and in active sensing lengths from 1cm to 200cm, in integral multiples of 1cm. Each sensor has an overall length 2cm greater than the active sensing length. All standard sensors are provided with four 30cm long #30 AWG teflon insulated leads for internal cryostat connections (color-coded, twisted phosphor-bronze leads are available). Custom sensors with longer inactive sections are quoted per your specifications.
Available Models
| Model | Outside Diameter | Active Sensing Lengths | Overall Lengths |
|---|---|---|---|
| 2D | 4.76 mm O.D. (3/16″) | 1 to 43 cm active sensing length | Up to 45 cm overall length |
| 3D | 6.35 mm O.D. (1/4″) | 1 to 109 cm active sensing length | Up to 111 cm overall length |
| 3DA* | 6.35 mm O.D. (1/4″) | 1 to 109 cm active sensing length | Up to 111 cm overall length |
| 4D | 9.52 mm O.D. (3/8″) | 110 to 200 cm active sensing length | Up to 202 cm overall length |
| FLEX | 9.52mm O.D. (3/8″) Flexible | Up to 200 cm active sensing length | Up to 202 cm overall length |
* Features a hermetically-sealed electrical connector on top of the sensor. Top 152mm (6″) of the sensor is 6.35mm (1/4″) O.D. stainless steel tubing. This allows the sensor to be easily removed when used with a compression fitting installed on the dewar (not included).