Detecting quench in a magnetic resonance examination system

A method of operating a magnetic resonance examination system, said system comprising a superconducting main magnet surrounding an examination region and generating a main magnetic field in the examination region, and further comprising a magnetic field gradient system selectively causing alternating gradient magnetic fields in the examination region, said magnetic field gradient system being coupled to the main magnet, wherein the method comprises the step of detecting an emerging quench of the main magnet, said detecting being carried out in different modes depending on the mode of operation of the magnetic resonance examination system,

• wherein
• in a first operating mode during ramp-up and ramp-down of the main magnet, the detection is performed by comparing a first measurement signal with a first threshold, and
• in a second operating mode during continuous operation of the main magnet, the detection is performed by comparing a second measurement signal with a second threshold.

A non-transitory computer-readable medium carrying software for controlling to detect an emerging quench of the main magnet of a magnetic resonance examination system by performing the steps of:

• in a first operating mode during ramp-up and ramp-down of the main magnet, receiving a first measurement signal and comparing the first measurement signal with a first threshold, and
• in a second operating mode during continuous operation of the main magnet, receiving a second measurement signal and comparing the second measurement signal with a second threshold.