BioSpec User Documentation

Magnet

The magnetic field of the magnet is permanently active. It is only to be de-energized in emergency situations by actively pressing the Magnet Emergency Quench Button (see instructions for use on the User Documentation DVD). The discharging process of the superconducting magnet is called a quench. An emergency applies whenever there is danger for a person to be injured due to the action of the magnetic forces, and there is no other solution than an emergency quench of the magnet. This might for example be the case when a person is squeezed and held against the magnet by a large ferromagnetic object. The force might be so high that it is impossible to remove the object and free the person without first de-energizing the magnet.

All personnel must be clearly instructed how to use the Magnet Emergency Quench Button and to use only in case of emergency (see instructions for use on the User Documentation DVD).

		CAUTION
	Risk of unwanted magnet quench. If the red Magnet Quench button is pressed a magnet quench is triggered immediately without the option to undo. 1. The red Magnet Quench button must be pressed only in case of emergency. • Read the Instructions for Use (System Manual) to understand the quench button function.

The magnet must be attached to a gas-exhaust line, called a quench tube. The quench tube is needed in the case of a quench of the magnet. Under normal operation conditions, the quench valve is blocked off towards the dewar of the magnet by the burst disk. In case of a quench, the burst disk brakes and the quench tube vents the quickly evaporating cryogen gases out of the magnet room. If a quench has occurred, immediately inform Bruker Service & Lifecycle Support to replace the broken burst disk to avoid condensation or re-sublimation inside the magnet dewar.

		WARNING
	Risk of personal injury or death Operating a MR instrument without an intact quench line is prohibited and represents a high potential risk of injury in case of a quench of the magnet.

		WARNING
	Injuries by bursting magnet As a protection of the outer vacuum case against internal overpressure a blind flange is installed as a drop off plate on the side of the outer vacuum case. It is held in position by the atmospheric pressure of the air outside the outer vacuum case and drops automatically in case of overpressure. • The drop off plate needs to drop off freely and automatically in case of overpressure. • Do not fix or clamp the drop off plate.

Severe damage of the magnet after a quench

After a quench, immediately inform Bruker Service & Lifecycle Support to replace the broken burst disk as soon as possible to prevent damage of the magnet.