Spectrostat®NMR liquid helium continuous flow cryostat for NMR magnets

The SpectrostatNMR offers a cryogenic system constructed of non-magnetic materials to provide a variable temperature sample environment from 2.7 to 500 K for nuclear magnetic resonance (NMR) experiments.

Compatibility with industry standard NMR spectrometers
Available with tail outer diameters of 51, 70 and 86 mm
Sample in exchange gas allowing fast change times for high sample throughput
Optimised thermal design providing excellent control and stability of the sample temperature

Specifications
System components/options
Operation
Applications
Images

	SpectrostatNMR standard	SpectrostatNMR HT
Temperature range	2.7-400 K (with EPS40 pump) 3.3-400 K (with GF4 pump) 80-400 K (with liquid nitrogen)	2.7-500 K (with EPS40 pump) 3.3-500 K (with GF4 pump) 80-500 K (with liquid nitrogen)
Single shot base temperature with EPS40 pump	1.6 K
Typical cooldown time	45 minutes
Approximate sample change time	1 minute
Tail outer diameter	See options

Dimensions
The SpectrostatNMR is available with a choice of three tail diameters to fit standard NMR magnet room temperature bores:

51 mm
70 mm
86 mm

Please specify the required cryostat length at time of order.

Temperature control and options

Flexible single- or 3-channel ITC503 temperature controller
The high temperature limit may be extended to 500 K with the High Temperature (HT) option

Pump options

A simple oil-free vane pump GF4 is supplied for operation to ~3 K
Lower temperatures require an EPS40 single stage rotary pump

LHe transfer

An automated needle valve can be fitted to the LLT transfer tube to allow automation of the helium flow regulation and optimisation of the liquid helium consumption

The SpectrostatNMR works on a continuous flow principle using an oil-free pump to draw liquid helium from a storage dewar, along a transfer tube, to a heat exchanger. Temperature control is achieved by balancing manual control of helium flow and power dissipated in an electrical heater, regulated using a temperature controller.

The SpectrostatNMR will also operate with liquid nitrogen (LN2) as coolant for measurements to 80 K.

Designed for nuclear magnetic resonance experiments, when used inside an NMR magnet

In solid state NMR, variable temperatures may be used to study intramolecular rearrangements or to slow down chemical processes to study reactive intermediates

The SpectrostatNMR can also be fitted in an electromagnet for magneto-transport or Kerr effect measurements