I. Product Introduction

The Model LN-2 Liquid Nitrogen Recondensing Cryocooler is developed by SINOSAFE Nuclear Technology, designed for use with vertical cold-finger high-purity germanium detectors. The equipment mainly consists of a Stirling electric cryocooler, liquid level sensor, pressure sensor, dewar flask, status monitoring software, etc. The Stirling cryocooler recondenses gaseous nitrogen in the dewar back into liquid form, allowing the initial charge of liquid nitrogen to be used continuously for more than two years, eliminating the need for frequent liquid nitrogen refilling. Compared with electrically cooled HPGe detectors, this design features no tight coupling between the HPGe detector and the cryocooler during operation, resulting in higher reliability and maintainability of the HPGe detector.

The Model LN-L-2 Liquid Nitrogen Recondensing Cryocooler is an integrated cooling device developed by SINOSAFE Nuclear Technology for L-shaped high-purity germanium detectors, and is also commonly used for the longitudinal measurement of waste drums.

LN-2: Liquid Nitrogen Recondensing Cryocooler for vertical cold-finger high-purity germanium detectors;

LN-L-2: Integrated Liquid Nitrogen Recondensing Cryocooler for L-shaped high-purity germanium detectors.

- Cooling type: Liquid nitrogen recondensing cooling with electric refrigeration unit.
- Equipped with status monitoring software, displaying time-varying curves of pressure, cold head temperature, liquid level, input power, etc.
- Fitted with a safety relief valve to prevent overpressure hazards caused by power failure.
- Capable of indicating liquid nitrogen level and pressure information with alarm function; equipped with RS485 or USB interface.
- With continuous power supply, liquid nitrogen can support continuous operation of the detection system for more than two years.
- Without power supply, liquid nitrogen can support continuous operation of the detection system for more than seven days.
- The energy resolution of the instrument remains stable during the cooling process.
- Adopts Stirling cryocooler.

III. Application Fields

Can be installed in all applications requiring liquid nitrogen cooling.