Varian UNITY INOVA NMR, Hardware Installation, Page: 9 / 65

SAFETY PRECAUTIONS
8
UNITY
INOVA Solids Hardware Installation 01-999044-00 C0501
Warning Notices ( continued )
Refer to the manuals supplied with the magnet for the size of a typical 10-gauss
stray field. This gauss level should be checked after the magnet is installed.
WARNING:
Only qualified maintenance personnel shall remove equipment covers
or make internal adjustments.
Dangerous high voltages that can kill or injure exist inside the instrument.
Before working inside a cabinet, turn off the main system power switch located
on the back of the console, then disconnect the ac power cord.
WARNING:
Do not substitute parts or modify the instrument.
Any unauthorized modification could injure personnel or damage equipment
and potentially terminate the warranty agreements and/or service contract.
Written authorization approved by a Varian, Inc. product manager is required to
implement any changes to the hardware of a Varian NMR spectrometer.
Maintain safety features by referring system service to a Varian service office.
WARNING:
Do not operate in the presence of flammable gases or fumes.
Operation with flammable gases or fumes present creates the risk of injury or
death from toxic fumes, explosion, or fire.
WARNING:
Leave area immediately in the event of a magnet quench.
If the magnet dewar should quench (sudden appearance of gasses from the top
of the dewar), leave the area immediately. Sudden release of helium or nitrogen
gases can rapidly displace oxygen in an enclosed space creating a possibility of
asphyxiation. Do not return until the oxygen level returns to normal.
WARNING:
Avoid liquid helium or nitrogen contact with any part of the body.
In contact with the body, liquid helium and nitrogen can cause an injury similar
to a burn. Never place your head over the helium and nitrogen exit tubes on top
of the magnet. If liquid helium or nitrogen contacts the body, seek immediate
medical attention, especially if the skin is blistered or the eyes are affected.
WARNING:
Do not look down the upper barrel.
Unless the probe is removed from the magnet, never look down the upper
barrel. You could be injured by the sample tube as it ejects pneumatically from
the probe.
WARNING:
Do not exceed the boiling or freezing point of a sample during variable
temperature experiments.
A sample tube subjected to a change in temperature can build up excessive
pressure, which can break the sample tube glass and cause injury by flying glass
and toxic materials. To avoid this hazard, establish the freezing and boiling
point of a sample before doing a variable temperature experiment.