Taylor TW-357 Defog Feature Will Not Operate, Push Buttons Will Not Respond, Power Failure Alarm

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TW-357 REV E

Defog Feature Will Not Operate

See LID OPEN ALARM.

To activate or adjust times: Select MENU, USER OPTIONS, CONTROL OPTIONS, LID/DEFOG SETTINGS, AUTO DE-FOG.

Push Buttons Will Not Respond

1.Check all ribbon cable connectors on back of display panel.

2.Moisture may have migrated into the sealed faceplate. Call Taylor-Wharton for a Return Authorization.

Liquid Level Readout is Incorrect

Liquid level is determined by a seven-thermistor assembly inside a protective sensor tube. The user may adjust the desired START FILL elevations and STOP FILL elevations for the pool of nitrogen with the confines of the four inches. The EX-LOW LEVEL ALARM is automatically assigned to the thermistor below the START FILL assignment, and the EX-HIGH LEVEL ALARM automatically reserves the thermistor above the STOP FILL thermistor assignment. For this reason START FILL cannot be assigned to thermistor number

1.Similarly, STOP FILL cannot be assigned to thermistor number 7. The factory installs this seven thermistor assembly all the way to the floor of the sensor tube, which positions thermistor number 1 one inch above the floor (i.e.; the first thermistor is offset from the floor zero inches).

If you would like to stop the fill at a depth greater than seven inches from the floor, the sensor assembly must physically be raised inside the sensor tube. The distance that it has been raised becomes the new OFFSET and the controller must be notified of this offset from the floor. The factory settings are START FILL at 3 inches and STOP FILL at 5 inches, with an OFFSET of zero. If you want to establish a START at 15 and STOP at 17, raise the sensor assembly 12 inches

(17 minus 5) and set the controller OFFSET to 12 by: Selecting MENU, LEVEL SENSING, SET SENSOR OFFSET. The unit should begin filling. The EX-LOW LEVEL sensor has been subjected to the gaseous condition and should sound an alarm (O.K. to MUTE). Note that in this scenario, you have directed your LN2 supply to accomplish a 15 inch fill level. It may be necessary to stop the fill manually and allow the supply vessel time to regain enough pressure to complete

this exceptionally long initial fill.

Power Failure Alarm

If power is interrupted, a note of the time and duration will be recorded in the log. No local alarm will be sounded unless a high temperature is detected after power resumes. The Remote Alarm will be triggered anytime the power is interrupted.

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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 VentilatedDispose of Waste Liquid Nitrogen Safely Freight Damage PrecautionsElectrical 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 OperationControl Components Sensor AssemblyInterface Panel 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 ConditionsTest Alarms System AlarmsLogging Dump Logs Error LogsSecurity Temperature LogsSystem Logs Erase LogsControl Temperature Lid Switch SetupControl By Temperature Temperature Control SettingsUser Access Logs Serial Communications and RS-232 SettingsTime and Date Set Valve Open Duration Control RangeFreeze-Guard Options Valve MonitoringAbout this Control Control On Battery Backup VersionSolenoid Valve Display BrightnessInterface Software Battery LifeStrainer Cleaning Instructions MaintenanceDefrosting Your LAB-Series CryoStorage System 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 Low LN2 Supply Temperature reading 10 to 20 degrees warmIndicates Open Sensor 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