Cryo-free QHR Fridge

Description

The National Physical Laboratory (NPL) requirement is for a refrigerator to house one of our Cryogenic Current Comparators (CCC). Currently the system is mounted in a dewar of helium to provide the necessary temperature, but this requires refilling periodically and we wish to move to a closed setup which does not need additional cryogens for sustained periods of operation.
The asset must therefore:
1) Allow the existing CCC components to be mounting in the cold space of the fridge.
2) Hold a steady temperature of 4 K or less for a sustained period.
3) Not require any additional liquid cryogens for cool-down or whilst running.
Note: Due to the Prior Indicative Notice (PIN) Reference 2024/S 000-019150 Published on 21/06/2024 the Authority is reducing the tendering timescales to 21 days.
NB: To express interest in this tender and to access the tender documents you will first need to be registered on the tendering portal. Please go to the landing page: https://lupc.bravosolution.co.uk/web/login.shtml  from where you will see a button to Register. Once registered you may search for this opportunity and express interest, download documents, etc.