TEC 3000 Cryogenic Freezer Controller

Liquid Nitrogen Level Measurement

• The TEC 3000 uses a differential pressure system to determine
  the LN2 level to an accuracy of± 0.5 in. (15 mm) and a resolution
  ofO.l in. (5.0 mm). Unlike alternative level sensing systems,
  differential pressure allows the exact level to be measured and
  displayed. Using the simple single point calibration in a range
  of 3.0 in. to 48.0 in. (75 mm to 1220 mm), the patented, selfmaintaining,
  closed-loop system displays in inches, millimeters,
  or a percentage full.

Automatic Liquid Nitrogen Level Control

• The fully automated LN2 level control system is based on userdefined
  parameters that can be electronically adjusted over the
  entire level range. The parameters include Low Level Alarm, Low
  Level Fill Point, High Level Fill Point and High Level Alarm. The
  redundant Dual Solenoid Valves for overfill protection run on 24
  VDC, 1.0 amp (max).

Liquid Usage

• This exclusive feature provides an estimation of liquid usage to
  track LN2 consumption and can provide an early failure warning
  to allow sufficient time to implement corrective action and save
  irreplaceable samples.

User-Defined Alarms

• A total of 17 audio/visual alarms are used to alert the user to any
  potential or developing problems. The alarms include: High
  Temperatures, Low Temperatures, High Level, Low Level, Liquid
  Usage, Maximum Fill Time, Gas Bypass, Temperature Calibrations,
  Low Battery, Power Failure, Lid Open and Communication
  Loss.

Remote Alarm Monitoring

• The TEC 3000 Alarm monitoring includes a Global Remote
  Alarm Relay, as well as four discrete contacts for High Level,
  Low Level, Temp A High and Low Battery.

Temperature Measurement

• Two independent temperature measurement channels are employed
  to accurately measure the temperature across the entire
  storage space. The two platinum RTD sensors have an accuracy
  of± l .0°C and a resolution of 0.1 °C. The temperature can be displayed
  in °C, °F or K. The single or two point calibration also has
  altitude compensation for the highest accuracy.

Hot Gas Bypass

• This unique feature is able to vent warm nitrogen gas from the
  supply line before initiating a fill. This prevents warm gas from
  entering the freezer space, which helps maintain a stable temperature
  gradient and increases the efficiency by reducing excess
  LN2 evaporation.

Event Log / Data Storage

• The TEC 3000 is able to store vital, unalterable, time-stamped
  data in nonvolatile memory. This is a great tool for assessing
  freezer performance and troubleshooting any problems. The
  memory can store 30,000 events, an estimated 10 years of storage
  capacity. The data includes time-stamped temperatures, LN2
  level, liquid usage, and any alarms or events.

Password Security

• The multilevel security system comprised of up to ten userspecific
  programmable passwords and four security levels can
  be customized to grant or restrict personnel access to certain
  menus and settings.

Communication Capabilities

• Two independent ports can be used to communicate with other
  TEC 3000 controllers, a remote PC, serial printer, or other RS-
  485 networks and devices. Options include ASCII, MOD BUS,
  Printer and One Fill All Fill (OFAF).