TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 12
5.5 LN2 Connection (For Optional Equipment)
Your chamber will require a supply of liquid nitrogen for the LN2 Boost Cooling option. The supply may range
up to 40 PSIG maximum. The connection is type 1/8” NPT. Make sure the connection is secure. Reference
the corresponding “Option” section in this manual and your chamber specifications for more details.
Warning! Gaseous nitrogen resulting from
vaporized LN2 displaces oxygen. Make sure the
area surrounding the chamber is well ventilated to
dilute the gas vented from the chamber vent port
checkvalve!
LN2 Flow Adjustment:
LN2 systems are provided with a manually set flow adjusting
valve, which permits the adjustment of nitrogen flow to avoid
incomplete evaporation at varying LN2 supply pressures. As
the chamber cools to the extreme cold temperature limit,
complete evaporation of liquid nitrogen may not occur if the
supply pressure is allowed to drop. Incomplete evaporation
will cause droplets of liquid to fall to the chamber floor and
cause puddling.
Do not allow liquid nitrogen to contact the door
gasket. Exposure to LN2 will damage the gasket
and violate the seal.
A setting of 4 turns open of the valve generally provides good
performance at a supply pressure of 20 to 25 PSIG. This valve may be readjusted as necessary to
accommodate the supply pressure at the end use point.
Note: Your equipment configuration may be slightly different from what is shown.
5.6 CO2 Connection (For Optional Equipment)
Your chamber will require a supply of liquid carbon dioxide for the CO2 Boost Cooling option. The supply
may range up to 1000 PSIG. The connection is type 1/8” NPT. Make sure the connection is secure.
Reference the corresponding “Option” section in this
manual and your chamber specifications for more details.
Warning! Carbon Dioxide gas displaces
oxygen. Make sure the area surrounding the
chamber is well ventilated to dilute the gas
vented from the chamber vent port checkvalve!
Note: There is no flow adjustment for the CO2 supply. A
fixed orifice on the injection port inside the chamber
regulates the supply.
Note: Your equipment configuration may be slightly
different from what is shown.
CO2 Boost Cooling
CO2 Supply
Connection
Vent Port
Checkvalve
Chamber
ccess Port
LN2 Boost Cooling
Chamber
ccess Port
Vent Port
Checkvalve
LN2 Supply Connection &
Flow Adjustment Valve
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