Worthington CS100 Instruction Manual

CS100 Control System
Operation & Maintenance Instructions
CAUTION - SAFETY FIRST!
• REVIEW AND UNDERSTAND ALL SAFETY PROCEDURES IN THE “HANDLE WITH CARE”
BOOKLET (P/N 367334) BEFORE ATTEMPTING TO INSTALL, OPERATE OR PERFORM
MAINTENANCE ON THIS LN2CONTROLLER.
• 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 WORTHINGTON
INDUSTRIES K SERIES UNITS, YOU MUST READ THE SEPARATE OPERATING AND
SAFETY MANUAL PROVIDED WITH THAT WORTHINGTON INDUSTRIES UNIT.
K Series Cryostorage Systems
This manual covers the use and maintenance for the CS100 installed on the K SERIES Cryogenic
Storage System. Please read all documentation before using this equipment and all personnel
who use this equipment should be trained. In addition, all service and maintenance on this equipment
should be performed by an authorized distributor, service company or technician.
Failure to follow instructions in this manual may result in damage to equipment, poor or unexpected
performance or injury to personnel operating the equipment.
Material in this manual is for information purposes only. The contents and the product it describes are
subject to change without notice. Worthington Industries makes no representations or warranties with
respect to this manual. In no event shall Worthington Industries be held liable for any damages, direct
or incidental arising out of or related to the use of this manual.

CS100 Control System
TABLE of Contents
SAFETY PRECAUTIONS FOR LIQUID NITROGEN ...................................5
Extreme Cold - Cautionary Statement ...................................................................... 5
Keep Equipment Area Well Ventilated ..................................................................... 5
Liquid Nitrogen System ......................................................................................... 5
Electrical .............................................................................................................. 6
GENERAL INFORMATION ..................................................................6
DELIVERY & RETURNS .......................................................................7
Unpacking and Inspection ..................................................................................... 7
Freight Damage Procedures ................................................................................... 7
Repackaging for Shipment .................................................................................... 7
Getting Unit into Service ....................................................................................... 8
Electrical ............................................................................................................. 8
Electromagnetic Compatibility (EMC) ...................................................................... 8
Power Supply Connection ..................................................................................... 9
Validation ............................................................................................................ 9
OPERATION ...................................................................................... 9
Initial Fill ............................................................................................................. 9
Operating Environment ....................................................................................... 10
CS100 Components ............................................................................................ 10
General Equipment Description ............................................................................ 10
Features ............................................................................................................ 11
LN2Level Measurement and Control ..................................................................... 11
Temperature Monitoring ...................................................................................... 12
Harness Assembly .............................................................................................. 12
Alarm Conditions ............................................................................................... 12
Solenoid Valve ................................................................................................... 13
Thermocouples ................................................................................................... 13
Power Supply .................................................................................................... 14
Remote Alarm .................................................................................................... 14
Operating Parameters ......................................................................................... 14
Temperature Monitoring ...................................................................................... 14
Liquid Phase Storage .......................................................................................... 14
Introduction ....................................................................................................... 15
Normal Fill Cycle ............................................................................................... 15
Control Setting Adjustments ................................................................................. 16
Temperature ....................................................................................................... 18
Menu System ..................................................................................................... 18
Factory Defaults ................................................................................................. 18
Installation & Setup ............................................................................................. 19
Alarms and Error Conditions ................................................................................ 20
System Alarms ................................................................................................... 21
Logging ............................................................................................................. 21
Display Brightness .............................................................................................. 21
Making Adjustments to the CS100 SERIES Control System Sensor
Assembly .......................................................................................................... 21
Maintenance ..................................................................................................... 22

CS100 Control System
Troubleshooting .................................................................................................. 24
Product Information ............................................................................................ 24
Interconnection Block Diagram ............................................................................. 26
REPLACEMENT PARTS ......................................................................27
Controller Assembly Parts .................................................................................... 27
Plumbing Controller Assembly Parts ...................................................................... 28
TROUBLESHOOTING .......................................................................29
FREEZER SERVICE AND MAINTENANCE HISTORY LOG ......................................... 29
Appendix .......................................................................................30
Certifications & Listings ........................................................................................ 30
EN Compliance Tables......................................................................................... 30
EC Declaration of Conformity ............................................................................... 34
Warranty ........................................................................................................... 35
Labels ................................................................................................................ 35
TABLE of Contents

5
CS100 Control System
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 LN2service 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 24.6 scf of nitrogen gas. Without adequate ventilation, the expanding nitrogen will
displace the normal air resulting in death.
Liquid Nitrogen System
The liquid nitrogen supply pressure at the inlet to the freezer 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 freezer, which can generate false signals to the liquid level controller
causing the freezer to under-fill. In “liquid phase” storage applications, excessive
turbulence can cause splashing, which could result in personal injury and/or damage
to the freezer. 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 freezer
plumbing to protect the line between the customer-supplied shut-off valve and the
freezer solenoid valve. Relief valves can be piped to the outside of the building.
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.
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:
Maintain adequate
ventilation
to prevent
asphyxiation
hazard (see Safety
Precautions).

6
CS100 Control System
Safety Precautions
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.
The liquid level controllers used with these freezers operate from 12 VDC. Disconnect
the electrical power cord from the outlet before attempting any service.
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: [e-mail].
WARNING:
Electrical shock can
kill. Do not attempt
any service on these
units without first
disconnecting the
electrical power
cord.
The CS100 SERIES Control System can monitor and control the liquid nitrogen level range in the cryostorage
unit you have selected. CS100 SERIES Control Systems are designed to work with Worthington Industries
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.
Worthington Industries 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 CS100 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.
General Information

7
CS100 Control System
Delivery & 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 ten (10) 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 Ex Works.
Domestic UPS Shipments – Any damage should be noted and reported to shipper upon delivery,
and Worthington Industries must also be notified. Confirm with Worthington Industries 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 should also be notified.
In all cases, Worthington Industries should be notified to 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 Worthington Industries of such filings. In case of parts or accessory shortages, advise
Worthington Industries immediately. Worthington Industries cannot be responsible for any missing parts unless
notified within 10 days of shipment.
Freight Damage Procedures
Any freight damage claims are your responsibility. Cryostorage Systems are delivered to
your carrier from Worthington Industries’ dock in new condition; when you receive the
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 Returned Material Authorization
(RMA) 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 RMA:
1. System model and serial number, and controller model and serial number.
2. User’s name, company, address, and phone number
3. Malfunction symptoms

8
CS100 Control System
Delivery & Returns
If possible, the original packing material should be retained for reshipment. If not available, consult
Worthington Industries for shipping and packing instructions. It is your responsibility to assure that the goods
are adequately packaged for return to the factory. All freezers returned to Worthington Industries must be clean
and decontaminated before return.
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 CS100 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 Worthington Industries Cryostorage freezer should be positioned such that 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
The liquid level controllers used with these freezers operate at 12 VDC. The external power supply has a 120
VAC (50/60 Hz) primary. Disconnect the electrical power cord from the wall 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 CS100 SERIES Control System.
The CS100 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 communicati ons equipment can affect the performance of the CS100 SERIES Control
System. Please use the guidelines and recommendations specified in the EN Compliance tables found on
pages 30–33.
Other equipment or systems can produce electromagnetic emissions and therefore can interfere with the
functionality of the CS100 SERIES Control System. Care should be used when operating the CS100 SERIES
Control System adjacent to or stacked with other equipment. If adjacent or stacked use is necessary, the
CS100 SERIES Control System should initially be observed to verify normal operation in the configuration in
which it will be used.

9
CS100 Control System
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 EN Compliance tables found on pages 30–33. Care
should be taken to use only manufacturer-recommended cables, power supplies and electrical accessories with
the CS100 SERIES Control System. If a third-party supplier offers cables, external power supplies and electrical
accessories for use with the CS100 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 30–33.
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 CS100 SERIES Control System or decreased
electromagnetic immunity of the CS100 SERIES Control System.
Power Supply Connection
Connect the power supply to your Cryostorage System and then plug the power supply into a surge-protected
wall 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.
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.
Delivery & Returns
Operation
Initial Fill
The Cryostorage System, using the CS100 SERIES Controller, comes preset from the factory. The liquid nitrogen
supply pressure at the inlet to the freezer should be in the range of 10 psig (0.7 bar/69 kPa) to 22 psig (1.5
bar/152 kPa) for optimum performance. Higher operating pressures will increase transfer losses and create
excessive turbulence of the liquid in the freezer, which can generate false signals to the liquid level controller
causing the freezer to under fill. In “liquid phase” storage applications, excessive turbulence can cause
splashing which could result in personal injury.

10
CS100 Control System
Operation
Operating Environment
The CS100 is designed to be operated at normal room temperatures (60°F to 80°F, 15°C to 27°C) and a
relative humidity level below 50%. The humidity level should be maintained such that the electronics are not
exposed to condensation.
The K SERIES Cryostorage system should be positioned such that all sides of the unit are easily accessible and
the user can easily connect/disconnect the power cord from the wall socket.
CS100 Components
The CS100 for the K SERIES Cryostorage system consists of the following components:
• Main Control and Display
• Harness Assembly
• Power Supply
• Thermocouple Assembly
• Sensor Assembly
• Cryogenic Solenoid Valve
• Remote Alarm Plug
The CS100 is assembled onto the freezer at the factory and completely tested. Start operation of the control
system by plugging the power cord into the wall outlet. The CS100 will go through a short startup routine
and then start operation. For information relating to assembly of the control components and connection
information, refer to Appendix A.
General Equipment Description
Main Control Front Panel

11
CS100 Control System
Features
The CS100 automatically maintains the Liquid Nitrogen (LN2) level and monitors temperature in the Cryogenic
freezer. In addition, operational conditions are monitored and an alarm is triggered if necessary. Audit and
operations data is stored in memory on the control board.
LN2Level Measurement and Control
The LN2level gauge on the face of the control indicates level by lighting the appropriate
LED if a thermistor is submerged in LN2. In the picture, the Low Alarm thermistor, the Start
Fill thermistor and the High Alarm thermistor are all submerged in LN2.
The CS100 uses thermistors to measure the LN2level 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 LN2within the freezer. The CS100 uses 4 thermistors to maintain the level. These
thermistors correspond to Low (Low Alarm), Normal (Start Fill), Normal (Stop Fill) and High
(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 LN2at which point the solenoid valve is closed preventing the flow of
additional LN2 into the vessel. The High Alarm thermistor is located 1” above the Stop Fill
thermistor and provides a safety. Likewise, the Low Alarm thermistor is located 1” below
the Start Fill thermistor and provides a safety. Factory settings provide a 2” range between
the start fill and stop fill thermistors.
The LN2level gauge on the face of the control indicates level by
lighting the appropriate LED if a thermistor is submerged in LN2. In
the picture, the Low Alarm thermistor, the Start Fill thermistor and
the Stop Fill Thermistor are all submerged in LN2.
Main Control Back Panel
Operation

12
CS100 Control System
Temperature Monitoring
The CS100 uses a Type T Thermocouple to determine the temperature
in the vessel. The thermocouple is installed near the top of the K SERIES
freezer and the temperatures are measured at that point. Multiple
temperature values are taken per second and then averaged.
The control provides a High Temperature Alarm that can be adjusted by
the user. If the temperature exceeds the temperature alarm set point, the
display flashes and an audible alarm is triggered.
Harness Assembly
Please see Appendix B for
instructions on calibrating the
temperature.
Alarm Conditions
The CS100 monitors a number of conditions and provides an alarm if a problem is detected. The alarms are
listed below:
Low Level Alarm
LN2 level is too low. Thermistor #1 on the sensor assembly is not submerged in LN2.
High Level Alarm
LN2 level is too high. Thermistor #4 on the sensor assembly is submerged in LN2.
Sensor Fault Alarm
A problem exists with the level sensor. The control detects an open sensor circuit, meaning that the sensor is
unplugged or the sensor assembly has been damaged.
High Temp Alarm
The temperature detected exceeds the high temperature alarm setting.
Operation

13
CS100 Control System
Thermocouple Open Alarm
A problem exists with the temperature sensor (thermocouple). The control detects an open circuit, meaning that
the sensor is unplugged or the sensor assembly has been damaged.
Power Failure
No Power.
Low LN2 Supply Alarm
A problem may exist with the LN2supply connected to the freezer. This alarm occurs if the freezer does not fill
within the designated amount of time determined by the setting on the control. This may occur for a number of
reasons including an empty supply cylinder, low pressure in the supply cylinder or a closed shut off valve.
Temp Alarm Delay
This is the amount of time after a warm temperature is detected before the control goes into alarm.
Audible Alarm Retrigger
The audible alarm is retriggered if the error condition that caused it is not corrected. The retrigger time can be
adjusted by the user.
Remote Alarm Delay
The control provides a relay to provide an external signal 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.
All alarms include the following:
• The LED array screen 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
Solenoid Valve
These units are designed to work with 12 VDC solenoid valve.
Thermocouples
Type T thermocouples monitor the temperature in the freezer. The user may choose to use NONE, 1
thermocouples with this control at any time. (The unit comes complete with one Thermocouple.)
Operation

14
CS100 Control System
Power Supply
A 12 VDC power supply is supplied for the CS100 SERIES Control System. This system is supplied with a
universal power supply that accepts 100/240 VAC (50/60 Hz). 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 Worthington Industries 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.
Operating Parameters
When materials are immersed in LN2, 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 vapor is still a very cold refrigerant,
but the freezer’s interior temperature increases as product is stored higher above the liquid. This temperature
differential is not significant for many biological storage applications, and is affected by the amount of product
stored in the freezer, the type, size and material of the inventory control system, and the liquid level in the unit.
The liquid level in the freezer is determined by the position 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.
Temperature Monitoring
The CS100 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 Worthington Industries Cryostorage freezer vapor chamber
and the temperature is measured at that point.
The control provides a High Temperature Alarm for the 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°C/-320°F) is required to maintain stored product viability
and the storage medium is adequate for storage in LN2. 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.
Operation

15
CS100 Control System
Care must be taken to ensure that the liquid level remains below the bottom of the freezer lid. Exposure
to LN2may result in physical damage to the lid. Additionally, operating the freezer with high liquid levels
characteristic of liquid phase storage may result in turbulence during fill cycles. Caution must be exercised if
the freezer lid is opened during a fill, and appropriate safety equipment should always be worn.
The Worthington Industries Cryostorage Systems are factory set for vapor phase storage.
Introduction
The CS100 Control System, temperature and LN2level controller is designed for easy operation and reliable
uninterrupted service. This controller will maintain the selected liquid level range of LN2in your freezer as well
as providing audible and visual alarms for any non-conforming conditions that may occur. An alarm is any
condition outside the activated preset limits on the control, such as an open sensor circuit or temperature alarm.
“System Events” are solenoid valve openings and closings, and operation of the controller’s relay for remote
alarm indication. System Events, Alarms and Temperature “Data” can be downloaded.
The System should require no additional attention to maintain liquid level if an adequate supply source of liquid
nitrogen is available. If your protocol calls for you to “top-off” the Cryostorage System at the end of a workday
or workweek, press the FILL button. The unit will fill to the upper allowable liquid level and stop automatically.
You may choose to manually stop the fill by pressing the STOP button at anytime during the fill.
Operation Data
The CS100 stores data related to the operation of the Cryostorage freezer. This data includes date, time, LN2
level, temperature, system events and error conditions. This data can be useful for audit purposes, operation
analysis and preventive maintenance.
Communications
The CS100 has been designed with advanced communications capabilities. This allows for the transfer of
data out of the control where the data can more easily be used. Please check with your supplier for available
protocols and compatible products.
Normal Fill Cycle
When the freezer is filled and the controller is operating, the START FILL and LOW ALARM sensors are
immersed in LN2. Their resistance values are interpreted by the controller as “in liquid”. At the same time, the
STOP FILL and the HIGH ALARM sensors are above the liquid pool, informing the control that these sensors are
in vapor. As LN2evaporates, the liquid level in the freezer drops slowly until the START FILL sensor is above the
liquid and sends a different signal to the controller. After a delay sufficient to ensure the signal, the controller
interprets this condition as low liquid level and opens the solenoid valve, admitting more liquid nitrogen from
the supply source.
The freezer will fill slowly. The fill continues until the STOP FILL sensor sends the controller a signal that it is
now in liquid. The controller will close the solenoid valve to stop the fill. As liquid evaporates, the display will
indicate the liquid is at a normal level as the cycle begins again.
Operation

16
CS100 Control System
Operation
Control Setting Adjustments
Level
The standard sensor assembly that is installed on a freezer consists of a circuit board with thermistors installed.
The assembly has a fixed fill range of 3”. The level can be changed by either raising or lowering the circuit
board within the freezer.
If a wider range is needed between the start fill and stop fill thermistor, please contact your supplier.
Menu System
Some control settings can be changed through the menu system.
Enter the menu system by pressing:
Move down through the menu system by pressing:
Move up through the menu system by pressing:
Select a menu choice or lock in a setting by pressing:
Back out of the menu system by pressing:
When changing settings, single button presses will increment/decrement a value one step at a time. Pressing
and holding a button will allow for rapid change of a setting.
The control will continue to monitor all sensors and conditions while the user accesses the menu system. If no
activity is detected for 30 seconds, the control will automatically revert back to the main operational screen.
Thermocouple Enable
The temperature sensor (thermocouple) can be turned on / off through the menu system. If the thermocouple
is turned on, the temperature is displayed on the LED display and a high temperature alarm will occur if
temperature exceeds the user-defined high temperature alarm setting. If the temperature sensor is turned off, no
temperature is displayed and no high temperature alarm can occur.
Set Date/Time
The date and time can be set through the menu system. The date and time is used to provide a date stamp
for data that is collected within the control. Use the appropriate buttons to adjust the settings and lock in the
values.

17
CS100 Control System
Operation
Select Date/Time and lock in values:
Decrement values:
Increment values:
Low Supply Alarm
The Low Supply Alarm timer can be changed through the menu system and can range from 30 to 120 minutes.
This alarm occurs if the filling operation takes too long to complete. If this alarm occurs the supply should be
checked to insure that the supply valve is turned on, a sufficient supply of LN2is available in the supply and the
supply pressure is adequate.
High Temp Alarm
The High Temp Alarm setting determines the temperature at which the control will indicate a high temperature
alarm. This is accessed through the menu system and values can range from 0°C to -196°C.
Temp Alarm Delay
The Temp Alarm Delay setting determines the length of time after the control detects a warm temperature before
it goes into alarm. This is accessed through the menu system and values can range from 0 to 60 minutes.
Audible Alarm Retrigger
The Audible Alarm Retrigger setting determines the length of time before the audible alarm reoccurs after it has
been muted. This only occurs if the error condition has not been corrected. This is accessed through the menu
system and values range from 0 to 720 minutes in 10 minutes increments.
Remote Alarm Delay
The Remote Alarm Delay setting determines the length of time before the remote alarm relay is triggered after
an error condition occurs. This is accessed through the menu system and values range from 0 to 720 minutes in
10 minutes increments.
Display Brightness
The Display Brightness is the setting that determines the lamination intensity of the display. This is accessed
through the menu system and values range from 1 to 15.

18
CS100 Control System
Operation
About
This provides information about the control including the firmware version, the control serial number and
contact information. This is accessed through the menu system.
Temperature
The temperature in the Cryostorage freezer is measured at the location of the thermocouple. The installation
location is different depending on the model of the freezer but usually the thermocouple is positioned level with
the top storage box. This may mean that temperatures displayed may be slightly warmer than the temperature
experienced by the samples or product stored in the freezer.
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.
Menu System
MENU
1. Thermocouple Enable........................... On/Off
2. Set Date/Time..................................... Hr – Min – Mon – Day - Yr
3. Low Supply Alarm................................ 30-120
4. High Temp Alarm................................. 0° to -196°
5. Temp Alarm Delay................................ 0-60
6. Audible Alarm Retrigger........................ 0 to 720
7. Remote Alarm Delay............................. 0 to 720
8. Display Brightness................................ 1 to 15
9. About................................................. K SERIES V1.1 Firmware
SER 12345 Serial Number
Factory Defaults
• Thermocouple....................................... On
• Date/Time............................................ Factory Set for Eastern Standard Time
• Low Supply Alarm................................. 30 minutes
• High Temp Alarm.................................. -100° C
• Temp Alarm Delay................................. 0 minutes
• Audible Retrigger.................................. 10 minutes
• Remote Alarm Delay.............................. 30 minutes
• Display Brightness................................. 7

19
CS100 Control System
Operation
Installation & Setup
The CS100 consists of the following components:
• Main Control / Display
• Power Supply
• Harness Assembly
• Thermocouple Assembly
• Sensor Assembly
• Cryogenic Solenoid Valve
• Remote Alarm Plug
Connect the wiring harness assembly to the main control / display. The connector is keyed and can only be
plugged in one way.

20
CS100 Control System
Operation
Connect the thermocouple plug of the harness assembly into the control at the thermocouple plug. This is
located on the right edge of the control if looking at it from the front. One of the blades on the plug is slightly
wider insuring that it is plugged in correctly. Copper blade should plug into copper colored plug. On the other
end of the harness, connect the Thermocouple assembly into the plug insuring that copper colored blade is
plugged into copper colored contact on receptacle.
Connect the level sensor assembly into the panel at the end of the level sensor harness assembly. The connector
is a round locking connector that is keyed so it can only be plugged in one way.
Connect the solenoid valve into the panel at the end of the wiring harness assembly. The connector is a 4 pin
locking connector that is keyed so it can only be plugged in one way.
Connect the Remote Alarm plug into the panel at the end of the wiring harness assembly. This is keyed so that
it can only be plugged in one way.
Finally, connect the barrel plug of the power supply into the receptacle on the back of the controller panel.
Alarms and Error Conditions
The CS100 SERIES Control System control monitors many different conditions in the freezer and has a full
complement of alarms associated with these different conditions. As alarms occur, they trigger an audible tone.
A remote alarm relay is also triggered following a user-designated period of time, after the error condition
occurs, if it is not corrected. In addition, the error condition is displayed on the top line of display until the error
condition is corrected. When an error occurs, the audible alarm may be muted by pressing the designated
button. The audible alarm will then be silent until activated by a new error condition or the alarm is not
corrected by the time the retrigger timer expires. A red light will continue to flash until all errors are corrected.
The remote alarm will be activated if the power is interrupted.
The High Temperature Alarm for the Thermocouple can be set through the menu system. This alarm is activated
if the temperature rises above the designated temperature. The alarm temperature can range from 0°C (32°F)
to -196°C (-320°F). It can also be disabled.