Taylor TW-357 Help Screens, Temperature Thermocouple Select, Calibrate Temperature, Level Sensing

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TW-357 REV E

Help Screens

The Help button provides help to the user at any point in the menu system. The help message is displayed and the user is then prompted to press a button to return to the menu system.

Temperature

Thermocouple Select

The chamber temperature is monitored with 1 or 2 Type T thermocouples. The thermocouple is placed in the chamber to monitor temperature level with the top rack. Factory installation includes one thermocouple inside of the thermocouple tube at an elevation to match the height of standard racks. A second Type T thermocouple may be added to monitor another location inside the chamber. Both thermocouples can be activated/deactivated through the menu system. (MENU, 1, 1)

Calibrate Temperature

KRYOS provides easy calibration of the thermocouples. To calibrate, the user should enter the menu system (MENU, 1,2). Remove the thermocouple from the thermocouple tube and dip thermocouple #1 into an ice water bath. The fourth line of the control display will indicate “Wait” and will give a reading on the proximity of the temperature to 0ºC. When the temperature reaches equilibrium the control will indicate “OK” and the user can press the left soft-key button. Dry the thermocouple thoroughly. Next, the control will prompt you to dip thermocouple #1 into LN2. Wait while the control reaches equilibrium at -196ºC (-320ºF). When it does, the control will again indicate “OK” and the user can again press the left soft-key button. The control is now calibrated. The thermocouple is now ready to be repositioned inside the thermocouple tube. Please note that both thermocouples are calibrated by going through this process with Thermocouple #1.

Test Temperature System

The temperature circuitry can be checked at any time through the menu system (MENU, 1,3). This check will tell if the thermocouples are working or if they are “open” (broken or unplugged). If a thermocouple is not connected to the control it will check as “open.” If a thermocouple is “Disabled” through the menu system, it will not show up on the check.

Level Sensing

The level sensing in the system is determined through the use of thermistor-based sensor assemblies. Thermistors are thermal resistors whose resistances change as temperature changes. Their use in liquid level control is a time-tested method to provide accurate results. The KRYOS uses a 7-, 8- or a 4-thermistor assembly to measure liquid level in the freezer. The 4-sensor assembly provides general information about liquid level (high, normal, and low alarm) while the 7- and 8-thermistor assemblies provide liquid level readings accurate to within one inch. When the LN2 level drops below the START FILL sensor, the control opens the solenoid valve to commence the fill process. This process continues until the LN2 level reaches the STOP FILL sensor. When the control “senses” that the LN2 has reached the upper level, it flashes “Check” on the display while the KRYOS insures that it has not received false signals and then allows the fill to stop. The fill process can be halted at any time before it reaches the STOP FILL sensor by manually pressing the STOP FILLING button.

Test Level Sensors

The sensor assembly can be tested through the menu system as well (MENU, 2, 1). The sensor diagnostics indicates the sensor number and the status (whether in liquid or gas) of that sensor. If the control is set for an eight-thermistor or Freeze-Guard sensor it will indicate 8 sensors in the diagnostics. Likewise, if it is set for a four-sensor assembly, it will indicate 4 sensors. The status is indicated with either an “O” for open, a “G” for gas or an “L” for liquid. This is an easy means to tell if sensors are in or out of liquid or if a new sensor assembly is needed (open sensors).

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Contents Labs TW-357 REV E Table of Contents InstallationLiquid Nitrogen System Safety Precautions for Liquid NitrogenExtreme Cold Cover Eyes and Exposed Skin Keep Equipment Area Well VentilatedElectrical Freight Damage PrecautionsDispose of Waste Liquid Nitrogen Safely Text Format Notation General InformationLabs Cryostorage Specifications Kryos Specifications Repackaging for Shipment InstallationUnpacking and Inspection Liquid Nitrogen Supply ConnectionKryos Control Field Installation Power Supply ConnectionInitial Fill OperationInterface Panel Sensor AssemblyControl Components Solenoid Valve Lid SwitchBattery Backup Remote AlarmOperating Parameters Liquid Phase StorageThermocouple Positioning Adding an Inventory Control SystemInventory Control System Layouts Labs Cryostorage System Racks are not Square Orientation is ImportantLABS-80K LABS-40K Fenwal 4R59953 Blood Bag Rack Arrangements Fenwal 4R5462 9955 Blood Bag Rack Arrangements Normal Fill Cycle PowerControl Operation IntroductionMenu System Main Display ScreenHigh Temperature 4.1 Valve Open Help Screens Temperature Thermocouple SelectCalibrate Temperature Test Temperature SystemSensor Type Alarms and Error ConditionsLogging System AlarmsTest Alarms Dump Logs Error LogsSecurity Temperature LogsSystem Logs Erase LogsControl Temperature Lid Switch SetupControl By Temperature Temperature Control SettingsTime and Date Set Serial Communications and RS-232 SettingsUser Access Logs Valve Open Duration Control RangeFreeze-Guard Options Valve MonitoringAbout this Control Control On Battery Backup VersionSolenoid Valve Display BrightnessInterface Software Battery LifeDefrosting Your LAB-Series CryoStorage System MaintenanceStrainer Cleaning Instructions Cleaning Your Taylor-Wharton CryoStorage System Making Adjustments to the Labs Kryos Sensor Assembly Units of measure Default Start Fill / Stop Fill Default Auto DefogKryos Kryos V9.0 & Kryos V9.0B Level Readings Offset ValueOhms to 18 K ohms Removing/Installing the Solenoid ValvePin View Schematics Sensor Plug SchematicPlumbing Assembly Labs Plumbing AssemblyIndicates High Liquid Level TroubleshootingSymptoms Controller Will Not Turn onIndicates Open Sensor Temperature reading 10 to 20 degrees warmIndicates Low LN2 Supply Fill Solenoid Makes Humming Noise Lid Open AlarmQCF Quick Chill Feature Will Not Operate Fill Solenoid Cycles On and OffLiquid Level Readout is Incorrect Defog Feature Will Not OperatePower Failure Alarm Push Buttons Will Not RespondFactory Settings Level Controller Electrical/Mechanical Parts80K/40K/20K Replacement PartsTaylor-Wharton Technical Services. Phone 800-898-2657 Fax Harsco Corporation