American Magnetics 187 Self-Compensating Liquid Level Controller - Manual (Page 11)

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Foreword
Safety Summary
rupture disks, etc.) included in the cryostat and top plate assembly are
necessary.
Recommended Safety Equipment
W First Aid kit
W Fire extinguisher rated for class C fires
W Leather gloves
W Face shield
W Signs to indicate that there are potentially dangerous cryogens in
use in the area.
Safety Legend
Instruction manual symbol: the product is marked with this
symbol when it is necessary for you to refer to the instruction
manual in order to protect against damage to the product or
personal injury.
Hazardous voltage symbol.
Alternating Current (Refer to IEC 417, No. 5032).
Off (Supply) (Refer to IEC 417, No. 5008).
On (Supply) (Refer to IEC 417, No. 5007).
Warning
The Warning sign denotes a hazard. It calls attention to a procedure or
practice, which if not correctly adhered to, could result in personal injury.
Do not proceed beyond a Warning sign until the indicated conditions are
fully understood and met.
Caution
The Caution sign denotes a hazard. It calls attention to an operating
procedure or practice, which if not adhered to, could cause damage or
destruction of a part or all of the product. Do not proceed beyond a Caution
sign until the indicated conditions are fully understood and met.