TW-357 REV E
35
WARNING: Never use chlorine-based disinfectants to clean a LABS CryoStorage System.
Normal Evaporation Rate (NER) Test
Nitrogen consumption is an accumulation of all system components and user introduced evaporation. The
storage chamber is a double walled, vacuum insulated vessel and contributes to the daily consumption of
liquid nitrogen. The liquid nitrogen supply vessel and transfer hose also contribute greatly to the daily
consumption rate. Choosing to control the vapor temperature, combined with the liquid level and temperature
specified, will affect the overall nitrogen consumption. In addition to these variables, opening the lid to
retrieve product, and adding new product into the storage chamber will pay a role in the accumulative liquid
nitrogen consumption.
If the nitrogen consumption of your CryoStorage system seems excessive, it may be appropriate to perform an
estimated Normal Evaporation Rate (NER) test on the CryoStorage chamber. To perform an NER test:
1. Fill the CryoStorage unit to the “High Level” sensor.
2. Measure the liquid nitrogen level with a plastic or wooden measuring rod.
WARNING: Never use hollow rods or tubes as dipsticks. When a warm tube is inserted into liquid
nitrogen, liquid will spout from the top of the tube and may cause personal injury.
3. Close and lock the lid of the LABS CryoStorage System for forty-eight (48 hours).
4. Open the LABS CryoStorage System and measure the liquid nitrogen level. Typically, liquid nitrogen
levels will drop approximately 3/8 in. (9.53 mm) per day. If your measurement indicates a drop in excess of
3/4 in. (19 mm) per day, please contact your Taylor-Wharton distributor or Taylor-Wharton for further
information. Please have your serial number, this manual and service history available.
WARNING: The source power supply at 110/120VAC can cause a lethal electrical shock. Unplug the
power cord before proceeding with any repairs.
The KRYOS has been designed for easy setup and maintenance. All connectors on the controller are uniquely
identified snap-on plugs. The thermocouple, sensor assembly, solenoid valve, power, remote alarm,
temperature recorder and data lines can be connected or disconnected in seconds.
Making Adjustments to the LABS KRYOS Sensor Assembly
The factory settings for the LABS control system are as follows:
• Low Level Alarm
= 2 (Always 1” below the start fill)
• Start Fill Sensor
= 3 (1 5/8” below the carousel tray)
• Stop Fill Sensor
= 5 (Just below the carousel tray)
• High Level Alarm
= 6 (Always 1” above the stop fill)
The sensor assembly is pushed to the bottom of the refrigerator as delivered from the factory. If adjustments
need to be made, the following procedure will simplify the process.
