Taylor-Wharton CS Series - Manual (Page 5)

3
CS SERIES
SAFETY PRECAUTIONS
Liquid Nitrogen
Nitrogen is an inert, colorless, odorless, and tasteless gas making up four-fifths of
the air you breathe – and can be
very dangerous. Air is roughly one-fifth oxygen.
Liquid nitrogen is at a temperature of -196°C (-320°F) under normal atmospheric
pressure. Cryogenic freezers are used in LN
2
service only.
Extreme Cold - Cautionary Statement
Accidental contact of liquid nitrogen or cold issuing gas with the skin or eyes may
cause a freezing injury similar to frostbite. Handle the liquid so it won’t splash or
spill. Protect your eyes and cover the skin where the possibility of contact with the
liquid, cold pipes and equipment, or cold gas exists. Safety goggles or a face shield
should be worn when operating this equipment. Insulated gloves that can be easily
removed and long sleeves are recommended for arm protection. Trousers without
cuffs should be worn outside boots or over the shoes to shed spilled liquid.
Keep Equipment Area Well Ventilated
Although nitrogen is non-toxic and non-flammable, it can cause asphyxiation in
a confined area without adequate ventilation. Any atmosphere not containing
enough oxygen for breathing can cause dizziness, unconsciousness, or even death.
Nitrogen, a colorless, odorless, and tasteless gas that cannot be detected by the
human senses, will be inhaled normally as if it were air. One (1) liter of liquid
nitrogen is equivalent to 696 liters of nitrogen gas. Without adequate ventilation, the
expanding nitrogen will displace the normal air resulting in death.
Liquid Nitrogen System
The liquid nitrogen supply pressure at the inlet to the refrigerator should be in
the range of 10 psig (0.7 bar/69 kPa) to 20 psig (1.4 bar/138 kPa) for optimum
performance. Higher operating pressures will increase transfer losses and create
excessive turbulence of the liquid in the refrigerator, which can generate false signals
to the liquid level controller causing the refrigerator to under-fill. In “liquid phase”
storage applications, excessive turbulence can cause splashing which could result in
personal injury and/or damage to the refrigerator. When installing piping or fill hose
assemblies, make certain a suitable safety relief valve is installed in each section
of plumbing between any two isolation points. Trapped liquefied gas will expand
greatly as it warms and may burst hoses or piping causing damage or personal
injury. A relief valve is installed in the refrigerator plumbing to protect the line
between the customer supplied shut-off valve and the refrigerator solenoid valve.
Relief valves can be piped to the outside of the building.
Electrical
• This product is not intended for a life support function.
• This product is intended to be used in hospitals and clinics.
• This product has no Radio Transmitter (Intentional Radiator) functions.
• This product is not intended for electromagnetic shielded rooms only.
• This product does not intentionally apply RF energy for its function.
• This product does not intentionally receive RF energy for its function.
The liquid level controllers used with these refrigerators operate from 12 VDC.
Disconnect the electrical power cord from the outlet before attempting any service.
WARNING:
The following safety
precautions are for
your protection.
Before installing,
operating, or
maintaining this unit
read and follow all
safety precautions
in this section
and in reference
publications. Failure
to observe all safety
precautions can
result in property
damage, personal
injury, or possibly
death.
Caution:
When installing field
fabricated piping,
make certain a
suitable safety relief
valve is installed
in each section of
piping between any
two isolation points.
WARNING:
Inlet pressure should
not exceed 22 psig
(1.5 bar/152 kPa).
Higher pressures
could result
in damage to
equipment.
WARNING:
Electrical shock can
kill. Do not attempt
any service on these
units without first
disconnecting the
electrical power cord.
WARNING:
Maintain adequate
ventilation to
prevent asphyxiation
hazard (see Safety
Precautions).