Nitrogen Level Sensor
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17 Nitrogen Level Sensor
17.1 Introduction
For the ASCEND family of NMR magnet systems a new digital liquid nitrogen sensor has
been developed and introduced in 2010.
The new sensor is compatible with all AVANCE spectrometers with BSMS BSVT electronics
(VPSB(-DC), SPB-E). For former BSMS/2 systems without BSVT, a Z108145 SLCB/3 board
is necessary.
Due to its digital concept this sensor avoids effects of analogue technology and provides a
user friendly plug and play operation as well as a direct on-board LED N2 level indication. It
allows measuring the level of the liquid nitrogen within the corresponding cryostat of the
magnet system at any time and as many times as wanted. Together with MICS software the
Nitrogen level measurement allows monitoring the Nitrogen level over longer time periods
and gives an estimate for the next refill date.
For easy use the sensor electronics has a built-in connector detection and automatically
provides
• A digital reading of the absolute fill level in percent, or
• an analog voltage between 0 and -5V (100% to 0% fill level)
on the same connector and is therefore fully compatible with all Bruker fill level measurement
units.
17.2 Configuration
For every size of cryostat an individual nitrogen level sensor length is necessary. The
electronics itself does not change.
On system level there are two configurations depending on the AVANCE NEO spectrometer
generation (digital or analog mode).
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