Thermo Scientific 7451 Operating And Maintenance Manual page 52

Section 6
Specifications
LN Injection
2
Patented liquid refrigerant injection ring optimizes uniformity and air flow.
Patent # 6,044,648
Operating Environment
Ambient Temperature: 15°C to 35°C
Relative Humidity: 20% to 85% non-condensing
Insulation
Foamed-in-place polyurethane
Air Flow
Horizontal from right to left, as viewed from the front
Sound Level
Unit in operation does not exceed 65 dBA.
Operational Features
Door interlock switch turns off LN , heater and fan motor, except during
2
the warm-up cycle.
During the warm-up cycle, the door can be opened with heater and fan
running (up to 0°C) to accelerate warming.
LN pressure relief valve located adjacent to LN connection.
2 2
Chamber pressure vent port located on left side-wall.
Heater overtemperature protection: At a temperature level of 93°C, a
manual reset device interrupts power to the heating element.
External Connections
Power entry
Strip chart temperature recorder
PC interface port
LN2 connection 1/2" flare
External thermocouple jack (IVF models only)
Sample access (IVF models only)
Thermo Scientific Controlled Rate Freezer 6-3