FTS LYOSTAR 3, Operator'S Manual

Page: 31 / 82

Rev 006, 01/14 21
© SP Scientific 2014
Chapter
5
Liquid Nitrogen Trap
The optional auto-fill Liquid Nitrogen (N
2(liq)
) Trap is designed to protect the vacuum
pump from the corrosive properties of acid and alkaline vapors, as well as the low
temperatures and organic solvents associated with the freeze-drying process.
A liquid level controller with a thermistor-type level sensor is provided with the Liquid
Nitrogen Trap. The controller helps to maintain between 1 and 4 inches (2.54 and
10.16 cm) of liquid nitrogen in the reservoir. Low- and high-level alarms are preset at
0 and 6 inches (0 to 15.24 cm).
Note: Refer to the liquid level controller operator’s manual for further information.
The following drawing illustrates the components of the liquid nitrogen trap.
WARNING! LIQUID NITROGEN, DUE TO ITS EXTREMELY LOW TEMPERATURES CAN CAUSE
SEVERE CRYOGENIC BURNS. EXERCISE CAUTION WHEN HANDLING. WEAR PROTECTIVE
GLOVES AND AVOID SKIN CONTACT. BEFORE OPERATING THE SYSTEM, READ THE
LIQUID LEVEL CONTROLLER MANUAL AND COMPLETELY FAMILIARIZE ALL PERSONNEL
WITH THE SAFE HANDLING AND STORAGE OF LIQUEFIED GASES.
WARNING! INERT GASES RELEASED IN A CONFINED SPACE CAN DISPLACE SUFFICIENT
AIR AND MAKE THE ATMOSPHERE INCAPABLE OF SUSTAINING LIFE. ENTERING AN
OXYGEN DEFICIENT ATMOSPHERE MAY CAUSE UNCONSCIOUSNESS WITHOUT WARNING.
Drain line
To Vacuum Pump
From Condenser
Relief Valve
Bypass Valve
Outlet Valve
Inlet Valve
Cryogenic
Solenoid
Valve
Liquid Level
Controller
N2(liq) Inlet
Level Sensor
Vent
Reservoir Cover Latch
(three latches total)
Cover Safety
(proximity switch
)