Taylor-Wharton CS Series User Manual
CS SERIES
Control System
CS200 OPERATION & MAINTENANCE INSTRUCTIONS
CAUTION - SAFETY FIRST!
• REVIEW AND UNDERSTAND ALL SAFETY PROCEDURES IN THE “HANDLE WITH CARE”
BOOKLET FORM # TW-10 P/N 7950-8052 BEFORE ATTEMPTING TO INSTALL, OPERATE
OR PERFORM MAINTENANCE ON THIS LN
• DO NOT ATTEMPT TO USE OR MAINTAIN ANY LIQUID NITROGEN FREEZER UNTIL YOU
READ AND UNDERSTAND THESE INSTRUCTIONS.
• DO NOT PERMIT UNTRAINED PERSONS TO USE OR MAINTAIN THIS UNIT.
• IF YOU DO NOT FULLY UNDERSTAND THESE INSTRUCTIONS, CONTACT YOUR SUPPLIER
FOR FURTHER INFORMATION.
• BEFORE ATTEMPTING TO OPERATE THIS CONTROLLER WITH ANY CRYOSCIENCE BY
TAYLOR-WHARTON™ LABS & K SERIES UNITS, YOU MUST READ THE SEPARATE
OPERATING AND SAFETY MANUAL PROVIDED WITH THAT TAYLOR-WHARTON UNIT.
*CS SERIES Control Systems are used on all Taylor-Wharton LABS units.
The unit featured is only one of the cryostorage systems available in the CryoScience by Taylor-Wharton™ lines.
CONTROLLER.
2
TABLE OF CONTENTS
SAFETY PRECAUTIONS ................................................................................. 3
Liquid Nitrogen ...................................................................................................... 3
Extreme Cold - Cautionary Statement ...................................................................3
Keep Equipment Area Well Ventilated ...................................................................3
Liquid Nitrogen System .......................................................................................... 3
Electrical .................................................................................................................3
GENERAL INFORMATION ............................................................................ 4
CS SERIES Control System Specifications ................................................................. 5
DELIVERY AND RETURNS.............................................................................. 7
Unpacking and Inspection ......................................................................................7
Freight Damage Procedures ..................................................................................7
Repackaging for Shipment ..................................................................................... 7
INSTALLATION ............................................................................................. 8
Getting Unit into Service ........................................................................................8
Electrical ................................................................................................................8
Electromagnetic Compatibility (EMC) ....................................................................8
Power Supply Connection .....................................................................................9
Validation ..............................................................................................................9
CS SERIES
OPERATION ................................................................................................. 9
Initial Fill ................................................................................................................ 9
Control Components ............................................................................................ 10
CS200 Controller Display Guide ........................................................................... 10
Operational Theory ..............................................................................................11
Operating Parameters .........................................................................................14
Temperature Monitoring .......................................................................................15
Liquid Phase Storage ............................................................................................15
Maintenance ......................................................................................................... 15
CONTROLLER OPERATION ......................................................................... 16
Introduction .........................................................................................................16
Operation Data .....................................................................................................16
Communications ................................................................................................... 16
Normal Fill Cycle .................................................................................................16
Control Setting Adjustments .................................................................................17
Temperature .........................................................................................................20
Battery Operation ................................................................................................ 21
Lid Switch ..............................................................................................................21
Interconnection Block Diagram .............................................................................25
Wiring Diagram ....................................................................................................26
Installation & Setup...............................................................................................27
Diagnostic Menu .................................................................................................. 29
External Connector Ratings ..................................................................................29
LED Status Wheel Flash Patterns ........................................................................... 29
Temperature Thermocouple Select ....................................................................... 30
Temperature Calibration ..................................................................................... 30
Test Temperature System .......................................................................................31
Test Level Sensors .................................................................................................31
Alarms and Error Conditions ...............................................................................32
System Alarms ......................................................................................................32
Test Alarms ..........................................................................................................32
Logging ................................................................................................................. 33
Dump Logs ............................................................................................................ 33
CS SERIES
TABLE OF CONTENTS (continued...)
Error Logs .............................................................................................................34
System Logs ..........................................................................................................34
Temperature Logs ................................................................................................34
Erase Logs ............................................................................................................. 35
Display Brightness ................................................................................................35
Making Adjustments to the CS SERIES Control System Sensor Assembly .............35
Removing/Installing the Solenoid Valve ...............................................................36
Controller Electrical Tests ...................................................................................... 36
Plumbing Assembly ............................................................................................... 37
TROUBLESHOOTING .................................................................................. 37
Symptoms .............................................................................................................37
Controller Will Not Turn ON ................................................................................37
Indicates High Liquid Level .................................................................................. 38
Indicates Low LN2 Supply ...................................................................................... 39
Indicates Open Sensor .......................................................................................... 39
Temperature Reading 10 to 20 Degrees Warm .....................................................39
Fill Solenoid Cycles On and Off ............................................................................ 40
Fill Solenoid Makes Excessive Humming Noise ..................................................... 40
Display = “Check” ............................................................................................... 40
Lid Open Alarm ....................................................................................................40
QCF (Quick Chill Feature) Will Not Operate .......................................................41
Defog Feature Will Not Operate .......................................................................... 41
Push Buttons Will Not Respond ............................................................................ 41
Liquid Level Readout is Incorrect .........................................................................41
Power Failure Alarm ............................................................................................41
REPLACEMENT PARTS ................................................................................ 41
SERVICE AND MAINTENANCE HISTORY LOG ............................................. 42
Appedix ...................................................................................................... 43
EN Compliance Tables ..........................................................................................43
Declaration of Conformity ....................................................................................47
Warranty ............................................................................................................... 47
Labels ...................................................................................................................48
CS SERIES
SAFETY PRECAUTIONS
Liquid Nitrogen
Nitrogen is an inert, colorless, odorless, and tasteless gas making up four-fifths of
the air you breathe – and can be very dangerous. Air is roughly one-fifth oxygen.
Liquid nitrogen is at a temperature of -196°C (-320°F) under normal atmospheric
pressure. Cryogenic freezers are used in LN2 service only.
Extreme Cold - Cautionary Statement
Accidental contact of liquid nitrogen or cold issuing gas with the skin or eyes may
cause a freezing injury similar to frostbite. Handle the liquid so it won’t splash or
spill. Protect your eyes and cover the skin where the possibility of contact with the
liquid, cold pipes and equipment, or cold gas exists. Safety goggles or a face shield
should be worn when operating this equipment. Insulated gloves that can be easily
removed and long sleeves are recommended for arm protection. Trousers without
cuffs should be worn outside boots or over the shoes to shed spilled liquid.
Keep Equipment Area Well Ventilated
Although nitrogen is non-toxic and non-flammable, it can cause asphyxiation in
a confined area without adequate ventilation. Any atmosphere not containing
enough oxygen for breathing can cause dizziness, unconsciousness, or even death.
Nitrogen, a colorless, odorless, and tasteless gas that cannot be detected by the
human senses, will be inhaled normally as if it were air. One (1) liter of liquid
nitrogen is equivalent to 696 liters of nitrogen gas. Without adequate ventilation, the
expanding nitrogen will displace the normal air resulting in death.
WARNING:
The following safety
precautions are for
your protection.
Before installing,
operating, or
maintaining this unit
read and follow all
safety precautions
in this section
and in reference
publications. Failure
to observe all safety
precautions can
result in property
damage, personal
injury, or possibly
death.
WARNING:
Maintain adequate
ventilation to
prevent asphyxiation
hazard (see Safety
Precautions).
Liquid Nitrogen System
The liquid nitrogen supply pressure at the inlet to the refrigerator should be in
the range of 10 psig (0.7 bar/69 kPa) to 20 psig (1.4 bar/138 kPa) for optimum
performance. Higher operating pressures will increase transfer losses and create
excessive turbulence of the liquid in the refrigerator, which can generate false signals
to the liquid level controller causing the refrigerator to under-fill. In “liquid phase”
storage applications, excessive turbulence can cause splashing which could result in
personal injury and/or damage to the refrigerator. When installing piping or fill hose
assemblies, make certain a suitable safety relief valve is installed in each section
of plumbing between any two isolation points. Trapped liquefied gas will expand
greatly as it warms and may burst hoses or piping causing damage or personal
injury. A relief valve is installed in the refrigerator plumbing to protect the line
between the customer supplied shut-off valve and the refrigerator solenoid valve.
Relief valves can be piped to the outside of the building.
Electrical
• This product is not intended for a life support function.
• This product is intended to be used in hospitals and clinics.
• This product has no Radio Transmitter (Intentional Radiator) functions.
• This product is not intended for electromagnetic shielded rooms only.
• This product does not intentionally apply RF energy for its function.
• This product does not intentionally receive RF energy for its function.
Caution:
When installing field
fabricated piping,
make certain a
suitable safety relief
valve is installed
in each section of
piping between any
two isolation points.
WARNING:
Inlet pressure should
not exceed 22 psig
(1.5 bar/152 kPa).
Higher pressures
could result
in damage to
equipment.
WARNING:
Electrical shock can
kill. Do not attempt
any service on these
units without first
disconnecting the
electrical power cord.
The liquid level controllers used with these refrigerators operate from 12 VDC.
Disconnect the electrical power cord from the outlet before attempting any service.
3
CS SERIES
For more detailed information concerning safety precautions and safe practices to
be observed when handling cryogenic liquids consult CGA publication P-12 “Safe
Handling of Cryogenic Liquids” available from the Compressed Gas Association:
CGA website: www.cganet.com; CGA customer service +1.703.788.2700; or email
customerservice@cganet.com.
GENERAL INFORMATION
The CS SERIES Control System can monitor and control both the liquid nitrogen
level and the vapor temperature range in the cryostorage unit you have selected. CS
SERIES Control Systems are designed to work with Taylor-Wharton LABS Cryostorage
Systems. The features are designed to provide a safe environment for samples while
at the same time tracking all relevant information associated with the freezer. This
control provides a complete historical record of the environment in your unit and
therefore, the environment in which your samples have been stored in this system.
This controller features a vacuum fluorescent display. The addition of a liquid
nitrogen supply and inventory control racks for systematic retrieval of stored product
completes the total Cryostorage System.
Taylor-Wharton LABS Cryostorage Systems are designed for applications where
extremely low temperature storage of biological products is required. They are also
appropriate for industrial or other applications where liquid nitrogen temperatures
and high capacity are needed.
Before beginning installation or operation of this CS SERIES Control System, make
sure that you read and understand this manual as well as the operating and safety
instructions for the cryostorage unit you will be using with this controller.
4
CS SERIES Control System Specifications
Control Type: LN2 Level Control & Temperature Control
Level Measurement Sensor Type: 8-Thermistor Fixed
4-Thermistor Adjustable
Range: 8 inch range (8-Thermistor)
Low, Normal, High (4-Thermistor)
Redundancy Multiple discrete points
CS SERIES
Temperature Measurement: Sensor Type:
Accuracy of 1.5% with Resolution of 0.1°c
Number of Channels: 2
Temperature Display Units: °C, F, K, R
Electrical: Input Voltage: 100-240 VAC
Input Current (max: 1.75 A
Input Current (continuous): 0.5 A
Power Consumption (max): 21 W
Power Consumption (continuous): 6 W Input
Frequency: 50/60 Hz
Output: 12 VDC
Control Input Voltage: 12 VDC
Power Cord: Available for all countries
Battery: Rating: 12 Volt, 18Ah
Type: Absorbent Glass Mat (AGM) Sealed Non-
Spillable
Short Protection: Installed PCB with thermal fuse
Battery Cover: Vinyl
Solenoid Valve Input Voltage: 12 VDC
Input Current 0.96 amps
Type T Thermocouples
Communications: Protocol: Connectivity Access Network (CAN)
Number of Communication Ports: 3
User Interface: Display Type Vacuum Fluorescent
Display: (VFD)
Buttons:11
Level, Temperature and Alarm
Information
“At a Glance” Status LED status wheel
Filling 1 LED
Menu Access 1 LED
Power LED
Control Tests: Power Up Self Test Control System Check
Thermistor Status
Battery voltage
Control voltages
Temperature Circuit
Alarms: Low Level Alarm: Always enabled
High Level Alarm: Always enabled
Sensor Error Alarm: Always enabled
High Temperature Alarm: (T/C #1, T/C #2)
Programmable
5
CS SERIES
Alarms (continued...): Low Temperature Alarm: (T/C #1, T/C#2)
Programmable
Thermocouple Calibration: Alarm Always enabled
Thermocouple Open Alarm: Always enabled
Power Failure (Remote only): Always enabled
Low LN2 Supply Alarm: Programmable
Battery Mode Warning: Always enabled
Lid Open Too Long Alarm: Programmable
Valve Stuck Open Alarm: Programmable
Unauthorized Access Warning: Programmable
LN2 Usage Warning: Programmable
Low Battery Voltage: Always enabled
Temperature Alarm Delay: Programmable
Audible Alarm: Always enabled
Audible Alarm Re-trigger: Programmable
Visual Alarm Indicator: Always enabled
Remote Alarm Delay: Programmable
Buttons: Power: Turns power on/off
Fill/Defog: Open Solenoid Valve
Stop: Close Solenoid Valve
Menu: Access Menu
Mute: Silence audible
Enter: Save a setting or select a menu choice
Back/Exit: Leave a setting unchanged or back out
of menu
Up Arrow: Scroll the menu system or increase a
value
Down Arrow: Scroll the menu system or decrease
a value
Left Arrow: Scroll horizontal menu
Right Arrow: Scroll horizontal menu
Data Collection: Temperature
Level
Alarms
Memory: 4 Mb
Dimensions: Display Width: 9.5 in. (241 mm)
Display Height: 2.0 in. (50.8 mm)
Display Depth: 1.31 in. (33.3 mm)
Display Weight: 0.625 lbs (.28 kg)
Main Control Width: 8.875 in. (225.4 mm)
Main Control Height: 6.688 in. (169.9 mm)
Main Control Depth: 1 in. (25.4 mm)
Main Control Weight: 1.0 lbs (.45 kg)
Battery Width: 7.25 in. (184.2 mm)
Battery Height: 6.375 in. (161.9 mm)
Battery Depth: 3.25 in. (82.6 mm)
Battery Weight: 12.4 lbs (5.6 kg)
6
DELIVERY AND RETURNS
Unpacking and Inspection
Inspect shipping containers for external damage.
All claims for damage (apparent or concealed)
or partial loss of shipment must be made in
writing within five (5) days from receipt of goods.
If damage or loss is apparent, please notify the
appropriate parties as indicated below:
Domestic LTL Shipments – The customer
should notify and file the appropriate damage
claims with the carrier. All products are shipped
FOB Origin.
CS SERIES
Figure 1.0 Crated LABS 38K
delivery, and Taylor-Wharton must also be notified. Confirm with Taylor-Wharton
Customer Service the filing procedures for any UPS damage claims.
International Shipments – Any damage and/or claims are to be filed with the
carrier. Insurance agent(s) and customs’ brokers should also be notified.
In all cases, Taylor-Wharton should be notified so we can assist if needed
in filing damage claims.
Open the shipping containers; a packing list is included with the system to simplify
checking that all components, cables, accessories, and manuals were received.
Please use the packing list to check off each item as the system is unpacked. Inspect
for damage. Be sure to inventory all components supplied before discarding any
shipping materials. If there is damage to the system during transit, be sure to file
proper claims promptly. Please advise Taylor-Wharton of such filings. In case of parts
or accessory shortages, advise Taylor-Wharton immediately. Taylor-Wharton cannot
be responsible for any missing parts unless notified within 10 days of shipment.
Domestic UPS Shipments – Any damage
should be noted and reported to shipper upon
Freight Damage Procedures
Any freight damage claims are your responsibility. Cryostorage Systems
are delivered to your carrier from Taylor-Wharton’s dock in new
condition; when you receive our product you may expect it to be in that
same condition. For your own protection, take time to visually inspect each
shipment in the presence of the carrier’s agent before you accept delivery. If any
damage is observed, make an appropriate notation on the freight bill. Then, ask the
driver to sign the notation before you receive the equipment. You should decline to
accept containers that show damage which might affect serviceability.
Repackaging for Shipment
If it is necessary to return any part of the system for repair or replacement, a
Material Return Authorization (MRA) number must be obtained from an authorized
factory representative before returning the equipment to our service department.
Contact your distributor for return authorization. When returning equipment for
service, the following information must be provided before obtaining an MRA:
A. System model and serial number, and controller model and unit, if available.
B. User’s name, company, address, and phone number
C. Malfunction symptoms
7
CS SERIES
CAUTION:
If using a power
source other than
North American
110/220 VAC,
contact TaylorWharton Customer
Service to make
sure you are using
the appropriate
converter. Use of an
unapproved power
source converter may
cause permanent
damage to the unit.
If possible, the original packing material should be retained for reshipment. If not
available, consult Taylor-Wharton for shipping and packing instructions. It is the
responsibility of the customer to assure that the goods are adequately packaged for
return to the factory. All refrigerators returned to Taylor-Wharton must be clean and
sterile before return. Refer to the operating manual of the freezer you are using for
cleaning instructions.
INSTALLATION
Getting Unit into Service
Your Cryostorage System comes with complete instructions for how you should
remove the unit from the crate and put it into service. Read both this manual and
your Cryostorage System’s manual before beginning any installation. Make sure to
follow any required procedures and safety guidelines when you are connecting your
Liquid Nitrogen source.
The CS SERIES Control System is designed to be operated at normal room
temperatures 15° C to 27° C (60° F to 80° F) at a relative humidity level below 50%.
The humidity level should be maintained such that the electronics are not exposed to
condensation.
The Taylor-Wharton Cryostorage freezer should be positioned such that the all sides
of the unit are easily accessible and the user can easily connect/disconnect the
power cord from the wall socket.
Proper ventilation MUST BE adequate to sustain life for those working with or
maintaining this equipment.
Electrical
WARNING:
Electrical shock can
kill. Do not attempt
any service on these
units without first
disconnecting the
electrical power cord.
WARNING:
Maintain adequate
ventilation to
prevent asphyxiation
hazard (see Safety
Precautions).
WARNING:
If the fill fails to
stop for any reason,
quickly close the
liquid supply valve
to prevent overfilling
until the cause of
the problem can be
determined.
The liquid level controllers used with these refrigerators operate at 12 VDC. The
external transformer has a 100/240 VAC primary. Disconnect the electrical power
cord from the outlet before attempting any service.
Electromagnetic Compatibility (EMC)
Although this equipment conforms to the intent of the 2004/108/EC EMC Directive,
all medical equipment may produce electromagnetic interference or be susceptible
to electromagnetic interference. The following are guidance and manufacturer’s
declarations regarding EMC for the CS SERIES Control System.
The CS SERIES Control System needs special precautions regarding EMC and needs
to be installed and put into service according to the EMC information provided in
the following pages.
Portable and Mobile RF communications equipment can affect the performance
of the CS SERIES Control System. Please use the guidelines and recommendations
specified in the EN Compliance tables found on pages 43-46.
Other Medical Equipment or Systems can produce electromagnetic emissions and
therefore can interfere with the functionality of the CS SERIES Control System. Care
should be used when operating the CS SERIES Control System adjacent to or stacked
with other equipment. If adjacent or stacked use is necessary, the CS SERIES Control
System should initially be observed to verify normal operation in the configuration in
which it will be used.
The electrical cables, external power supplies and accessories listed or referenced
in this manual have been shown to comply with the test requirements listed in the
8
CS SERIES
EN Compliance tables found on pages 43-46. Care should be taken to use only
manufacturer-recommended cables, power supplies and electrical accessories
with the CS SERIES Control System. If a third-party supplier offers cables, external
power supplies and electrical accessories for use with the CS SERIES Control System
and they are not listed or referenced in this manual, it is the responsibility of that
third-party supplier to determine compliance with the standards and tests in the EN
Compliance tables found on pages 43-46.
The use of electrical cables and accessories other than those specified in this manual
or referenced documents may result in increased electromagnetic emissions from
the CS SERIES Control System or decreased electromagnetic immunity of the CS
SERIES Control System.
Power Supply Connection
Connect the power supply to your LABS Cryostorage System and then plug the
power supply into a surge-protected 110/220 VAC outlet.
Validation
Some organizations require that equipment be validated periodically. If information
is needed on the proper techniques to validate this equipment, please contact your
supplier.
WARNING:
This equipment
is intended for
use by healthcare
professionals. As
with all electrical
medical equipment,
this equipment
may cause radio
interference or
may disrupt the
operation of nearby
equipment. It may
be necessary to take
mitigation measures
such as re-orienting
or relocating the
CS SERIES Control
System unit or
shielding the
location.
OPERATION
These instructions are for operators experienced with cryogenic equipment. Before
operating the system, become familiar with the safety precautions in this manual
and in reference publications. Make certain all applicable provisions set forth in the
Installation Section have been followed before placing a system in operation. Study
this manual thoroughly. Know the location and function of all system components.
Initial Fill
The Cryostorage System, using the CS SERIES Controller, comes preset from the
factory. The liquid nitrogen supply pressure at the inlet to the refrigerator should be
in the range of 10 psig (0.7 bar/69 kPa) to 20 psig (1.4 bar/138 kPa) for optimum
performance. Higher operating pressures will increase transfer losses and create
excessive turbulence of the liquid in the refrigerator which can generate false signals
to the liquid level controller causing the refrigerator to under fill. In “liquid phase”
storage applications, excessive turbulence can cause splashing which could result in
personal injury.
For complete instructions for the initial fill refer the Quick Start Guide that comes
with your cryogenic freezer model.
9
CS SERIES
Control Components
CS SERIES Control System Components
The CS SERIES Control System for the Taylor-Wharton Cryostorage freezer consists of
the following components:
• Main Control Module
• VFD (Vacuum Florescent Display) Module
• Shielded Display Cable
• Wiring Harness Assembly
• Power Supply
• Thermocouple Assembly (Optional Second Thermocouple)
• Sensor Assembly
• Cryogenic Solenoid Valve
• Remote Alarm Plug
• Lid Switch Assembly
• 12 Volt, 18aH battery
• Solenoid Valve Assembly with Freezeguard
• Strainer
The CS SERIES Control System is assembled onto the freezer at the factory and
completely tested. Refer to the Quick Start Guide for freezer set-up. Start operation
of the control system by plugging the power cord into the wall outlet. Press and hold
the POWER button for 2 seconds. The CS SERIES Control System will go through
a short startup routine and then start operation. Refer to Figure 2.0 below CS200
Controller Display for a description of the controller’s navigation buttons.
CS200 Controller Display Guide
Status Wheel VFD Graphics Display
Shows information
about the Freezer
Fill Button
Used to Open
the Valve
Stop Button used
to Close the Valve
Valve Indicator lights
if the Valve is Open
Figure 2.0 CS200 Controller Display
Enter button “selects”
a Menu choice or setting
Mutes the
Audible Alarm
Directional Buttons
Increment/decrement values or allow
movement through the menu system
Power Indicator
Power On/Off
Back Button moves
out of Menu System
or leaves current
Setting unchanged
Enter/Exit
Menu System
Menu Indicator
10
Operational Theory
The CS SERIES Control System automatically maintains the Liquid Nitrogen (LN2)
level and monitors temperature in the Cryogenic freezer. Operational conditions
are monitored and any alarm is triggered if necessary. Operations data is stored in
memory on the control board.
#8
#7
High Level Alarm #6
CS SERIES
#5Stop Fill
#4
#3Start Fill
#2Low Level Alarm
#1
Figure 3.0 Thermister LN2 Level
The CS CONTROL SYSTEM uses thermistors to measure the LN2 level within
the vessel. A thermistor is a thermal resistor and its resistance changes as the
temperature changes. When a thermistor is submerged in LN2, its resistance will be
significantly greater than its resistance at room temperature. The control can detect
this resistance change and determine the level of the LN2 within the freezer. The CS
CONTROL SYSTEM is designed to work with an 8 thermistor assembly. There are
four thermistors that can be selected that will maintain the LN2 level. These selected
thermistors correspond to Low Alarm, Start Fill, Stop Fill and High Alarm. When
the LN2 level drops below the Start Fill thermistor, the control opens a solenoid
valve allowing LN2 to enter the vessel. This continues until the Stop Fill thermistor is
submerged in LN2 at which point the solenoid valve is closed preventing the flow of
additional LN2 into the vessel. The Low Alarm, Start Fill, Stop Fill and High Alarm
settings can all be changed by the user through the menu system.
11
CS SERIES
The LN2 level is indicated on the display and is determined by the number of
thermistors submerged in LN2 according to the table below:
Table 1.0 8-Thermistor Sensor (G=NORMAL, L=LN2 Flow)
#1 #2 #3 #4 #5 #6 #7 #8 Offset Display Actions
G G G G G G G G 0 0 Low Alarm, Filling
L G G G G G G G 0 1 Low Alarm, Filling
L L G G G G G G 0 2 Filling
L L L G G G G G 0 3 Normal
L L L L G G G G 0 4 Normal
L L L L L G G G 0 5 Stop Fill
L L L L L L G G 0 6 High Alarm
L L L L L L L G 0 7 High Alarm
L L L L L L L L 0 8 High Alarm, Valve
stuck Open Alarm
Alarm Conditions
The CS SERIES Control System monitors a number of conditions and provides an
alarm if a problem is detected. The alarms are listed below:
Note: Please see
description of the offset.
Level displayed may vary
depending on the offset
setting.
Table 2.0 Alarm Conditions
ALARM PROBLEM DETECTED
Low Level Alarm
High Level Alarm LN2 level is too high. Thermistor #6 on the sensor assembly
Sensor Error Alarm A problem exists with the level sensor. The control detects an
High Temperature Alarm The temperature detected is warmer than the high
Low Temperature Alarm The temperature detected is colder than the low temperature
Thermocouple Calibration
Alarm
Thermocouple Open Alarm A problem exists with the temperature sensor
Power Failure No Power.
Low LN2 Supply Alarm A problem may exist with the LN2 supply connected to the
LN2 Use Warning The consumption of LN2 has increased and should be
LN2 level is too low. Thermistor #2 on the sensor assembly is
not submerged in LN2.
is submerged in LN2.
open sensor circuit meaning that the sensor is unplugged or
the sensor assembly has been damaged. A faulty sensor is
denoted as “O” for open.
temperature alarm setting.
alarm setting.
The calibration data is incorrect.
(thermocouple). The control detects an open circuit meaning
that the sensor is unplugged or the sensor assembly has
been damaged.
freezer. This alarm occurs if the freezer does not fill within
the designated amount of time determined by the setting
on the control. Possible reasons include an empty supply
cylinder, low head pressure in the supply cylinder or a closed
shut off valve.
checked.
12
Table 2.0 Alarm Conditions
ALARM PROBLEM DETECTED
Operating in Battery Mode
Alarm Warning
Low Battery Voltage The voltage on the battery is low.
Lid Open Too Long Alarm The lid has been opened for a period which is longer than
Valve Stuck Open Alarm The valve is stuck open.
Unauthorized Access
Warning
Temp Alarm Delay This is the amount of time after a warm temperature is
Audible Alarm Retrigger The audible alarm is retriggered if the error condition that
Remote Alarm Relay The control provides a relay to provide an external signal
The power from the power supply has been disrupted and
the control system is operating on battery power.
the designated alarm setting.
The lid has been opened and an incorrect or no
identification has been entered.
detected before the control goes into alarm.
caused it is not corrected. The retrigger time can be adjusted
by the user.
that an alarm condition has occurred. The user can set the
remote alarm timer that determines the amount of time an
error must be active before the relay is triggered.
CS SERIES
All alarms include the following:
• The flashing status wheel flashes to signal an error condition
• An audible tone sounds
• The error detected is displayed and scrolled on the screen
• The remote alarm relay changes state to provide a dry contact output signal
Lid Switch
The LABS Lid Switch (Figure 4.0) is attached to the hinge and determines whether or
not the lid is open on the freezer. This also allows the control to determine whether
to activate the Auto Defog, Quick Chill or Lid Alarm features.
Lid Switch
Figure 4.0 LABS Lid Switch
Solenoid Valve
These units are designed to work with 12 VDC solenoid valve (see Figure 17.0 LABS
Plumbing Assembly on page 37).
Thermocouples
Type T thermocouples monitor the temperature in the freezer. The user may choose
to use NONE, 1 or 2 thermocouples with this control at any time. (The unit comes
complete with one Thermocouple)
13
CS SERIES
Remote Alarm Connector
Power Supply
A 12 VDC power supply is supplied for the CS SERIES Control System. The system is
supplied with a transformer compatible with common household (North American)
100/240 VAC. (For other power outlets contact Taylor-Wharton Customer Service.)
UL approval for the system as a whole is not required since the control operates on
low voltage. If your power source differs, or is subject to disruption or line surges
due to other equipment on line, consult your Taylor-Wharton representative.
Remote Alarm
If an error condition occurs after a user defined period of time, a remote alarm
can be initiated. This is accomplished by connecting a remote device to the remote
alarm jack on the rear electrical panel. The 3-pin jack on the back of the unit
provides continuity between pin #2 (common) and pin #3 in the normal condition.
Continuity between pin #1 and pin #2 is provided in an error condition.
Figure 5.0 Remote Alarm Plug Connection
Operating Parameters
When materials are immersed in liquid nitrogen, they will assume the temperature
of the liquid (-196°C/-320°F). When material is stored in the vapor phase over the
liquid, the liquid nitrogen is still a very cold refrigerant, but the refrigerator’s interior
temperature increases as product is stored higher over the liquid. This temperature
differential is not significant for many biological storage applications, and is affected
by the amount of product stored in the refrigerator, the type size and material of
inventory control system, and the liquid level in the unit.
The liquid level in the refrigerator is determined by the position of the of the
Thermistor Assembly in the sensor tube. These sensors are set at installation to
maintain a specific liquid level. A filling cycle is initiated when the level falls below
the Start Fill sensor and is completed when the Stop Fill sensor is reached. This
filling cycle repeats when the level fall below the Start Fill sensor. Sensor Probe
assignments may be changed on the controller keypad to define new start and stop
levels, and these levels may be set independently to vary the liquid level deference
between fills. Prior to the initial fill of the refrigerator, a determination should be
made whether vapor phase or liquid phase storage will be utilized.
All units are supplied with an eight thermistor assembly and a freeze-guard sensor
unless otherwise specified. The LABS factory setting positions will maintain liquid
level within a distance of 2 in. (50.8 mm) from the bottom of the operating tray on
the LABS 20K, 38K, 40K, 80K units, and 3 in. (76.2 mm) from the bottom of the
operating tray on the LABS 94K.
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Temperature Monitoring
The CS SERIES Control System uses a type T thermocouple to monitor the
temperature in the vessel. The thermocouple is factory-installed near the top of
the Taylor-Wharton Cryostorage freezer vapor chamber and the temperatures are
measured at that point.
The CS SERIES Control System accommodates a second user-installed thermocouple
for temperature measurement at a secondary location. This is also a Type T
thermocouple.
The control provides a High Temperature Alarm for each thermocouple which can
be selected by the user. If the temperature exceeds the temperature alarm set point,
the status wheel flashes and an audible alarm is triggered.
Liquid Phase Storage
Liquid phase storage is normally utilized when -196 is required to maintain stored
product viability and the storage medium is adequate for storage in liquid nitrogen.
In a typical liquid phase storage system, the liquid level sensors are positioned to
maintain the liquid level at or below the top level of the inventory control system.
During operation, the upper levels of the inventory control system will at times
become exposed as the liquid level fluctuates.
CS SERIES
Care must be taken to ensure that the liquid level remains below the bottom of the
refrigerator lid. Exposure to liquid nitrogen may result in physical damage to the lid.
Additionally, operating the refrigerator with high liquid levels characteristic of liquid
phase storage may result in turbulence during fill cycles. Caution must be exercised
if the refrigerator lid is opened during a fill, and appropriate safety equipment
should always be worn.
The Taylor-Wharton Cryostorage Systems are set at factory for vapor phase storage.
Maintenance
To insure proper operation and maintain excellent performance of the TaylorWharton Cryostorage freezer, an annual maintenance schedule should be followed
for the CS SERIES Control System. This would include the following:
Table 3.0 Annual Maintenance Schedule
CS SERIES Control
System
Harness Assembly
Battery
Solenoid Valve
Lid Switch
Level Sensor Assembly
Thermocouple Assembly
Power Supply
Examine for exposure to moisture, wear and tear,
connector problems, and cracks or other damages
to the faceplate or buttons. In addition, periodic
firmware updates may be important.
Examine for damage to the cable and damage to
connectors.
Examine connection cable and connector for
damage.Examine vinyl cover for damage.
Replace every 2 years.
Examine wires and connector for damage.
Replace every 3 years.
Examine lid switch pickup and wires for damage.
Replace if necessary.
Examine for damage to wires and connector.
Examine for damage to wires and connector.
Examine for damage to power supply and power
cords.
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