Calibration/Test Unit (CTU) Operator`s Manual
Contents
1. CK3 lt 0 2 C Water Temperature T3 3 checks 0 4 C lt CK1 lt 0 4 C 0 4 C lt CK2 lt 0 4 C 0 4 C lt CK3 lt 0 4 C Water Temperature T4 3 checks 0 4 C lt CK1 lt 0 4 C 1 0 C lt CK2 lt 1 0 C 1 0 C lt CK3 lt 1 0 C Miscellaneous Heat Cool Flow Heat lt 120 seconds Cool lt 150 seconds Factor H 300ml min lt Flow lt Factor H 300ml min Secondary Alarm Alarm 37 in lt 18 seconds Test Criteria Primary Alarm Alarm 34 in lt 14 seconds Chiller Capacity Test Model 2000 02 Water Temp lt 12 C Model 2000 03 or 10 Water Temp lt 13 C APPENDIX A SPECIFICATIONS Voltage 115V 60Hz or 230 50 60Hz Current 4 5A or 2 25A e Fuse 6 3A Slow Blow 2 e Power 500W Specifications e Voltage 115V 60Hz ou 230 50 60Hz e Courant 4 5A ou 2 25A e Fusibles 6 3A 2 e Alimentation 500W 202. may result in damage to the device e The CTU must not be used on equipment while connected to a patient e Do not use the Calibration and Test Unit in the presence of flammable agents because an explosion or fire may result e Anyone performing the procedures must be appropriately qualified e Carefully observe the Calibration and Test unit for fluid leaks before and during use Leakage may result in lower flow rates or an electrical shock hazard Discontinue use immediately if leakage is observed e For indoor use only CHAPTER 2 THEORY OF OPERATION 21 Introduction The Calibration and Test Unit CTU is an instrument that is used to calibrate and verify operation of the ARCTIC SUN Temperature Management System Model 2000 Control Module It is a hand sized unit that connects directly to the fluid delivery line port taking the place of the Model 2000 fluid delivery lines and pads The CTU can be used to semi automatically test and calibrate the Control Module s two patient temperature measurement inputs the temperature out function and the internal water temperature measurement channels It can also be used to automatically verify the Control Module s flow rate and inlet pressure measurements Correct operation of the Model 2000 s primary water over temperature alarm can also be verified manually using this device 2 2 Basic CTU Operation The CTU is used as an external stimulus and measuring device by software embedded in the Cont
3. operation of the Control Module s safety systems The test unit heaters are thermally and electrically protected and are only powered while pressing the Heater Power Switch 2 3 Controls A rotary switch S1 two slide switches S2 and S3 and a heater switch S4 comprise the CTU controls The Output Select Switch S1 is used to select the temperature simulator to be applied to the patient temperature channel Six switch positions represent specific temperatures as follows e Position A is open or no connection e Position B is approximately 10 8 C e Position C is approximately 25 5 C e Position D is approximately 34 5 C e Position E is approximately 40 0 C e Position F is a shorted connection The precise values of the simulators listed above are determined by a calibration process and are listed on a calibration sticker on the CTU The slide switch S2 is used as follows e Position A connects Patient Temperature Channel 1 to the rotary switch and Patient Temperature Channel 2 to the Temperature Out Channel e Position B connects Patient Temperature Channel 1 to the CTU temperature sensor and Patient Temperature Channel 2 to the rotary switch e Position C connects Patient Temperature Channel 1 to the Temperature Out Channel The slide switch S3 is used as follows e Position A connects the internal thermistor to an open connection e Position B connects the internal thermistor to a parallel r
4. Both T1 and T2 readings must be within 0 24 C of the probe the T3 sensor must be within 0 4 C of the probe reading and the T4 sensor must be within 0 4 C 11 checked at the 6 deg temperature only An ck err X message X sensor 1 2 3 or 4 is displayed if the criteria is not met 2 5 8 Calibration All checks with the exception of the Temperature Out check must have been successfully completed before calibration is allowed The Temperature Out check must at least be attempted but does not have to be successful since the check will fail if the function has not been previously calibrated N A is displayed following the Cal System prompt if calibration is not allowed At this point the operator may record the system clock and reject or proceed with the new calibration The final stage of calibration uses PT1 to measure the Temperature Out as it is stepped through the range of possible values This process takes about 28 minutes Upon completion the operator is prompted to save the calibration values The information saved during the save process includes e New cal factors generated during the calibration e CTU values A thru G entered during the test e Cal Hours value which was set to zero prior to the save The stored CTU values can be manually set to defaults by exercising the Erase Novram User Defaults Diag 23 menu option in advanced service mode Additionally stored CTU values will automatically be s
5. Medivance ARCTIC SUN Temperature Management System Calibration Test Unit CTU Operator s Manual SA A a ss SHE SC Sp a BA EE Medivance Calibration Test Unit REF 741 00 115 46 60Hz 4 5A CHAPTER 1 INTRODUCTION ses nanana n0NA KNA KNNANN SANA ANAN SUMA NN NN NN NN KANN ANAN KNAN KEE KEEN unene nenanem nanen aa 3 1 1 Use of the Calibration Test Unit CTU Operator s Manual 3 1 2 Customer Information and Technical Support 3 13 System Descriptio Naa stihl eA E eee A 3 1 4 Symbols and Standards s eeeeeeneeene eeste ee eent nssn tetr nssnnsttnntnntnnstnnnsnnsstnssnnnntnnnnnsrnnsrnnnnn 5 1 5 Environmental Condions sir 6 1 6 General WathiNgS ET 6 CHAPTER 2 THEORY OF OPERATION nnnencennenenerenneennennes 7 2 1 ugeet EE 7 2 2 Basic CU OPO rations Sr ne tn a ast Ar Naa reine ia anne 7 2 3 EE 7 2 41 SGONNECLIONS ee EE ee EEGENEN 8 2 5 Understanding the Test and Calibration Sequence naawa nnwwwananawannaananaaanaanwannnas 9 2 5 1 Calibration Factor 6 9 2 5 2 Screen Navigation siennes 9 2 5 3 dl le 9 2 54 Pre Warm and Flow 9 2 5 5 Patient Temperature Channel Checks namana awanaaanaaawanaawanannaaaanaasanwnann 10 2 5 6 Temperature Out Check sisi 10 2 5 7 Water Temperature Check 2 mmnanwawanawawanaananaaanaaaaananananaaanasanasanaananaasnasansnasassnanana 11 2 5 8 CalilbratiOnits rente fo tat aca E 12 2 6 Water Tempe
6. Model 2000 that bear the ETL Monogram have been Certified for Safety by ETL Intertek in accordance with standards C22 2 No 61010 1 ISA 82 02 01 IEC 61010 1 MOD and UL 61010 1 Indicates high temperature part or component The maximum temperature of this internal component allowed by the protective system is also listed Indicates electrical hazard Indicates Earth Ground Identifies the heater fuse Identifies the storage temperature range Identifies the storage relative humidity range Indicates the date of manufacture Indicates conformity with European standards for this device Denotes calibration data Denotes a push button momentary switch 1 5 Environmental Conditions e Ambient Temperature Range o Operating Temperatures 18 C to 24 C 65 F to 75 F o Transport and Storage Temperatures 30 C to 50 C 20 F to 120 F e Ambient Humidity Range o Operating Humidity 5 to 95 relative humidity non condensing o Transport and Storage Humidity 5 to 95 relative humidity non condensing e Ambient Atmospheric Pressure Range o Operating 375 mmHg to 795 mm Hg o Transport and Storage 375 mmHg to 795 mm Hg NOTE If the Calibration Test Unit is used at higher room temperatures the test system s cooling capability and accuracy may be degraded e Ingress Protection Rating IPXO0 for ordinary usage 1 6 General Warnings e This equipment is to be used only as described in this manual Failure to do so
7. R USE The entire test and calibration process takes approximately 75 minutes Operator assistance is required only in certain stages Stage 1 Warm up Flow Check and Patient Temperature Calibration 10 minutes after a 10 minute warm up operator assistance required Stage 2 Water Temperature Calibration 30 minutes automatic Stage 3 Interim Results Reporting 1 minute operator assistance required Stage 4 Temperature Out Calibration 30 minutes automatic Stage 5 Acceptance 1 minute operator assistance required m Stage 6 Water Temperature Alarm Test 15 minutes operator assistance required Stage 7 Chiller Capacity Test 15 minutes operator assistance required 4 1 Stage 1 2 and 3 Warm up Flow Check Patient Temperature Calibration Water Temperature Calibration and Interim Results Reporting ech Replace the fluid delivery lines with CTU 2 Connect the Blue circular connector labeled PT1 to the Model 2000 connector Patient Temperature 1 larger thermometer and patient symbol 3 Connect the Blue circular connector labeled PT2 to the Model 2000 connector Patient Temperature 2 smaller thermometer and patient symbol 4 Connect the Black circular connector labeled TO to the Model 2000 connector labeled TEMP OUT 5 Set the CTU switches S1 B S2 A s S3 A Note For best results act promptly when instructed by the machine Do not allow the machine to lie
8. arted at any time during the test The first time the check is aborted the sequence restarts at the beginning of the current check The second time the check is aborted the sequence restarts at the beginning of the check group Each check is completed when the following criteria is met e The difference between patient temperature average and the respective CTU temperature value is within 0 8 C e The patient temperature is stable within 0 01 C If any check cannot meet the above criteria within 60 seconds a message is displayed along with a prompt to retry Temporary calibration parameters are calculated based on the data obtained from Check 1 A and Check 4 D These parameters are then applied to the average values obtained for all four checks These values are then checked against the respective CTU values that had been entered The measured values must be within 0 14 C of the CTU values for successful completion An error message is displayed if the criteria is not met The process is identical for Patient Temperature 2 with the exception of the S2 position 2 5 6 Temperature Out Check The Temperature Out Check is very similar to the patient temperature checks in that the same four sensor simulators are used The operator is prompted to sequence the system through a PT1 measurement of each while PT2 measures the Temperature Out Temperature Out is an echo of Patient Temperature 1 Obviously this test requires precise measurem
9. ata Figure 5 5 4 2 Stage 4 Temperature Out Calibration 1 Press the Enter Key if calibration is desired The sequence may be aborted at this stage if only verification is desired The Calibrate System menu screen displays the number of Cal Hours that have elapsed since the system was last calibrated 4 3 Stage 5 Acceptance 1 Save the calibration data if desired by pressing Enter on the Save Calibration Values screen If only verification is desired do not save If the new data is not saved the calibration will revert to the previous set of values Note If the Up arrow is pressed at this time a No Calibration Values were Saved prompt displays and pressing the Enter produces the Exit screen 4 4 Stage 6 Water Temperature Alarm Test 1 2 Press the Manual Mode Key Press the Down Key once and change the Water Target Temperature to 42 C Press the Home Key Allow the water temperature to stabilize at 42 C for at least 5 minutes Note It is important to allow the temperature to fully stabilize at 42 C If it does not it may not be possible to attain the alarm conditions Press the S4 switch on the CTU Monitor the T3 temperature and release the switch once the temperature reaches 44 5 C Start the timer when the T1 temperature reaches 43 01 C Verify that Alarm 37 sounds in less than 18 seconds Note If the T1 water temperature drops below 43 01 C restart the t
10. d Test Unit and ARCTIC SUN Temperature Management System Model 2000 Control Module work together to perform the tests and calibration in a semi automated sequence This section gives a step by step description of how this is accomplished 2 5 1 Calibration Factor Longevity In order to perform this process accurately various parameters of the Control Module must first be calibrated to be used in subsequent measurements It should be noted that this calibration is temporary and it applys only during the Test and Calibration Sequence This data is saved only if the operator accepts the calibration at the end of the sequence 2 5 2 Screen Navigation Screen navigation is achieved primarily through prompts and operator responses Pressing the Remote Display Enter Key will move the system through a defined test sequence The Up and Down Keys are also used for data entry and for scrolling through some menu selections Other remaining keys function normally such as Automatic Manual Purge Stop and Cancel and do not change function during this process It should be noted however that the Control Module will abort the test and calibration sequence and return to the User Diagnostic Mode screen if any of these keys are pressed 2 5 3 Initiation Test and Calibration Mode is a sub mode of User Diagnostic Mode The test and calibration sequence is started by scrolling to the UD4 Screen following the prompts The Control Module will enter Test and Calibra
11. e Management System and how the CTU can be used to troubleshoot problems in addition to its normal test and calibration functions Requests for technical support information or orders may be placed by mail fax or by calling Medivance Customer Service Medivance hours of operation are 8 30 am to 6 pm Eastern Time Emergency support is offered after hours by calling 887 267 2314 1 3 System Description The CTU is for the most part a passive device that provides stimulus and feedback to the ARCTIC Sun Temperature Management System to enable it to test and calibrate itself The sole active function of the CTU is to provide an external heat source to force the circulating water temperature over the safety limit of the machine in order to test its safety systems Model No ARCTIC 501 Temperature Management System Model 2000 Phone Toll free 877 267 2314 Fax 720 880 5400 Address 321 South Taylor Avenue Suite 200 Louisville CO 80027 E mall ARCTICSUNOrders crbard com Internet www medivance com European Representative Bard Limited Forest House Brighton Road Crawley West Sussex UK RH 11 9BP 1 4 Symbols and Standards The CTU bears the following symbols affixed to the system A Table 1 1 CTU Symbols For the safe and effective use of this device the operator must consult the accompanying documents prior to use Models of the ARCTIC SUN Temperature Management System
12. e water Release the switch Note If S4 is held too long or is pressed when no water is flowing a safety circuit will turn off power to the heater The CTU must be allowed to cool completely if this should occur Once verification and calibration is complete press the Purge key to remove the water from the CTU Turn off the ARCTIC SUN Temperature Management System Model 2000 and remove the CTU Disconnect associated cabling from the Model 2000 and reconnect operator cabling Drain the water from the CTU before storing Table 4 1 Model 2000 Verification Data Test Criteria Flow Rate Factor H 300ml min lt Flow lt Factor H 300ml min Inlet water pressure 7 2 psi lt P lt 6 8 psi Patient Temperature 1 PT1 4 checks 0 3 C lt CK1 lt 0 3 C 0 3 C lt CK2 lt 0 3 C 0 1 C lt CK3 lt 0 1 C 0 3 C lt CK4 lt 0 3 C Patient Temperature 2 PT2 4 checks 0 3 C lt CK1 lt 0 3 C 0 3 C lt CK2 lt 0 3 C 0 1 C lt CK3 lt 0 1 C 0 3 C lt CK4 lt 0 3 C Patient Temperature Echo Out 4 checks 0 2 C lt CK1 lt 0 2 C 0 2 C lt CK2 lt 0 2 C 0 2 C lt CK3 lt 0 2 C 0 2 C lt CK4 lt 0 2 C Water Temperature T1 3 checks 0 4 C lt CK1 lt 0 4 C 0 4 C lt CK2 lt 0 4 C 0 2 C lt CK3 lt 0 2 C Water Temperature T2 3 checks 0 4 C lt CK1 lt 0 4 C 0 4 C lt CK2 lt 0 4 C 0 2 C lt
13. ent by the patient temperature channels Therefore the patient temperature checks must first be successfully 10 completed If not N A is displayed at the Temperature Out Check summary screen to indicate that it could not be completed Each check is completed when the following criteria is met e The difference between the PT1 average and the respective CTU temperature value is within 0 8 C e The Temperature Out as measured by PT2 is stable within 0 01 C If any check cannot meet the those criteria within 75 seconds an error message displayed along with a prompt to retry 2 5 7 Water Temperature Check The Water Temperature Check again requires that the operator enter calibration data from the CTU E through G Once this is done the system requires the user change the S3 position at the beginning of the low temperature set point and then back after the low temperature setpoint has completed The system runs in Manual Mode for the duration of the test As the system runs the water temperature is controlled at various setpoints while PT1 measures the temperature of the water flowing through the CTU This reference temperature is then used to check the system s internal water temperature sensors Check 2 and Check 4 also serve as heating and cooling capacity tests Four segments of up to 15 minutes each comprise the Water Temperature Check Check 1 takes place at approximately 6 C Check 2 at approximately 28 C Check 3 at approx
14. esistance shifting the temperature up at the low water temperature setting allowing it to be read by the patient temperature circuit The heater power switch S4 is a momentary normally open switch that applies AC power to the two 250W heaters when pressed and held in the ON position 2 4 Connections A hydraulic connection and three electrical connections must be made to the control module so that the unit will function correctly in conjunction with the control module s software functions e The hydraulic connection is a custom fitting which mates directly to the control module The seal must be tight with no leaks to ensure a proper test e The three electrical connections are labeled PT1 PT2 and TO o PT1 corresponds to the primary patient temperature receptacle on the control module o PT2 corresponds to the secondary patient temperature connector o TOcorresponds to the temperature out connector on the control module e TO has a different keying scheme from PT1 and PT2 and therefore cannot be interchanged However care must be taken when connecting PT1 and PT2 because they can be interchanged If this does occur the control module will indicate an error on the user interface display e The electrical cables do not supply a voltage or current They are passive connections with the voltage or current being supplied by the control module 2 5 Understanding the Test and Calibration Sequence The Calibration an
15. et the system performs a purge for approximately one minute to prepare for checking the inlet pressure offset Then once purging is complete the system performs an internal test of the patient temperature channels If successful it indicates completion of the pre warm flow check and the final average flow is displayed along with a prompt to continue If successful completion of the pre warm flow check does not occur within 12 minutes of its initiation a time out error is indicated Also note that the pre warm flow check can be aborted by pressing the Enter Key It can be started again at any time during the test sequence At this point operator assistance is needed to observe the flow result and to remove the CTU so that the pressure sensor and circuit can be zeroed The pressure offset is calculated after the user responds and the pressure stabilizes within 0 01PSI The pressure offset result is then displayed for the user to observe Note that if the offset is greater than 0 5PSI a message is displayed 2 5 5 Patient Temperature Channel Checks Operator assistance is needed to start the Patient Temperature 1 PT1 checks Four items of CTU calibration data must be entered A through D The operator is then prompted to sequence the system through measurement of a set of precision resistors that simulate a patient temperature sensor at various temperatures Any of the temperature checks can be aborted by pressing the Enter Key and then rest
16. et to defaults if the cyclical redundancy check crc value for either of the CTU values is incorrect when retrieved from memory The default CTU values are A 10 87 C B 24 54 C C 34 35 C D 39 97 C E 0 00 C F 0 00 C G 0 00 C 2 6 Water Temperature High Alarm Check The CTU includes a 500W heater that is activated by a momentary switch This heater can be used to add heat when the Arctic Sun is operating at its highest water temperature setpoint to force a high water temperature alarm thus verifying the alarm s correct operation CHAPTER 3 MAINTENANCE 3 1 Recommended Maintenance The Calibration and Test Unit contains no operator maintainable parts Other than periodic cleaning of the exterior surfaces none is required Cleaning instructions Spray a mild detergent solution onto a towel and wipe down the unit Take care to not saturate the towel with the solution use only enough to dampen the unit Towel dry the unit after wiping it down with the cleaning solution If a Mains fuse opens inoperative heater return the CTU to Medivance for service An open fuse is indicative of a problem that requires immediate service 3 2 Calibration The CTU should be returned to the manufacturer for calibration every two years The date of last calibration is indicated by the international symbol for calibration an upside down solid black triangle V Which can be found on the top of the CTU CHAPTER 4 INSTRUCTIONS FO
17. idle waiting for data input or test unit switching Note If an alarm occurs during calibration check the CTU connections and switch positions If the alarm persists power down and start over If the alarm persists call Medivance Service Note The calibration process can be aborted and restarted at any time by pressing Enter 6 Power up while holding the Automatic and Purge Keys 7 Verify that the unit is at least 3 4 full If not fill the unit 8 At the User Diagnostic Home Screen press the Up Key once twice if Patient Temperature 2 is enabled to scroll to the UD4 Screen Press the Enter Key to initiate the Test and Calibration Mode 9 Follow the prompts on the Remote Display Module Note The Control Module software will ask for the CTU calibration data termed A through G at various points in the process This data is printed on the CTU label Note If any of the check values are outside the bounds listed in Table 4 1 calibrate the ARCTIC Sun Temperature Management System Model 2000 as described below CTU Connections Figure 5 2 Medivance Calibration Test Unit REF 741 00 115VAC 60Hz 4 5A __ mer 741 00 115 46 60Hz 45A un Been Aug 240 Catarata USA BOLT Naki teg KIT AT 2314 ene magin Lverpoe Gerten EASE nine CTU Switch 1 Figure 5 3 o Pr AA 4 CTU Switches 2 and 3 Figure 5 4 CTU S N 7001 A 10 88 B 25 55 C 34 54 D 39 99 CTU Calibration D
18. imately 40 5 CC and Check 4 at approximately 38 C During this process Patient Temperature 1 Outlet Water Temperature 1 T1 Outlet Water Temperature 2 T2 Inlet Water Temperature T3 Chiller Temperature T4 the inlet pressure and the flow are continuously averaged monitored Each check point requires the following to complete successfully e The average T2 must be within 2 0 C of the corrected reference temperature i e the CTU probe as measured by PT1 e The corrected reference temperature must momentarily cross over the desired cal temperature 6 C 28 C and 40 5 C and then cross back over again The only exception is check 4 where the reference temperature must only drop below 38 C e The average Inlet Pressure must be within 0 2 PSI of 7 0 PSI e The Bypass Valve must be closed If a check cannot be completed in 15 minutes a message is displayed Again this test requires precise measurement by the patient temperature channels Therefore the patient temperature checks must first be successfully completed Further in the measurement of water temperature flow is also important Therefore the inlet pressure check must also have been completed as suction is the driving force in creating flow If not N A is displayed at the Water check prompt to indicate that it could not be completed Newly calibrated temporary values are checked against the corrected average probe temperature values obtained during the checks
19. imer when the water again reaches 43 01 C Turn power off Turn power on and allow the Control Module to start normally Press the Manual Mode Key Press the Down Key once and change the Water Target Temperature to 42 C 11 12 13 14 Press the Home Key Allow the water temperature to stabilize at 42 C for at least 5 minutes Note It is important to allow the temperature to fully stabilize at 42 C If it does not it may not be possible to attain the alarm conditions Press the S4 switch on the CTU Monitor the User Interface Water temperature and start the timer once the temperature reaches 42 6 Verify that alarm 34 sounds in less than 14 seconds Release the switch immediately Note If the water temperature drops below 42 6 C restart the timer when the water again reaches 42 6 Note If the water temperature exceeds 44 1 C for more than 1 second Alarm 33 will occur and the test must be repeated Note If S4 is held too long or is pressed when no water is flowing a safety circuit will turn off power to the heater The CTU must be allowed to cool completely if this should occur 4 5 Stage 7 Chiller Capacity Test 1 2 Press the Manual Mode Key Press the Down Key once and change the Water Target Temperature to 6 C Press the Home Key Allow the water temperature to stabilize at 6 C for at least 5 minutes Press and hold S4 for 10 minutes Note the temperature of th
20. rature High Alarm Check 12 CHAPTER 3 MAINTENANCE ieaiaia NAG Eed NEESS e 13 3 1 Recommended Maintenance 13 3 20 e EE 13 CHAPTER A INSTRUCTIONS FOR USE nn AA 14 4 1 Stage 1 2 and 3 Warm up Flow Check Patient Temperature Calibration Water Temperature Calibration and Interim Results Reporting wa wnnnawanawanasnawannan 15 4 2 Stage 4 Temperature Out Calibration us 16 4 3 Stage 5 ACCeptANCe ENEE 16 4 4 Stage 6 Water Temperature Alarm Test 16 4 5 Stage 7 Chiller Capacity Test 17 APPENDIX A SPECIFICATIONS eege ENEE EAR EENS NEESS 20 TABLE OF CONTENTS REF 000744 01 Rev F 2 CHAPTER 1 INTRODUCTION 1 1 Use of the Calibration Test Unit CTU Operator s Manual The Calibration Test Unit provides an effective and easy way of checking and calibrating if necessary the ARCTIC SUN Temperature Management System Model 2000 This Manual provides a detailed description of the CTU its use construction routine maintenance and calibration It is important that the CTU be properly maintained and serviced in accordance with the instructions described in this manual Only trained personnel should use and service this product 1 2 Customer Information and Technical Support The CTU is intended to be used in association with the ARCTIC SUN Temperature Management System Model 2000 Service Manual The Service Manual provides detailed information about the ARCTIC SUN Temperatur
21. rol Module By testing the subsystems of the CTU in sequence operation of the Control Module can be verified and calibrated The CTU contains precision resistors that simulate several patient temperatures After a warm up period the simulated temperatures are first applied to the Warming System patient temperature inputs to temporarily calibrate each channel This calibration is temporary in the sense that it is used to perform the balance of the testing It is not saved by the Control Module until the operator accepts it Once the patient temperature channel s accuracy has been temporarily established the CTU s temperature probe is connected to the Control Module s Patient Temperature 1 input The Control Module then circulates water through the CTU at various temperatures The patient temperature channel can then be used to check and calibrate the accuracy of the internal water temperature sensors and circuits The fluid path in the CTU is designed to allow a specific flow which was selected to provide this flow rate at a given pressure Since the Model 2000 controls the inlet pressure at a constant value a crosscheck of flow and pressure measurement accuracy can be obtained The flow rate and inlet pressure offset are checked and the inlet pressure offset is zeroed during the initial warm up period The CTU contains heaters that are used to slowly raise the system water temperature above its high temperature limits in order to verify correct
22. tion Mode only if all of the following are true e Patient Temperature 1 is between 10 C and 12 C e Patient Temperature 2 is less than 10 C e The reservoir level is 4 or greater These unique conditions are required to ensure that the system is connected to the CTU not a patient The operator has one minute to respond affirmatively or the Control Module returns to the normal User Diagnostic Mode If one of the criteria above is not met the user is prompted to rectify it 2 5 4 Pre Warm and Flow Check The system pre warm and flow check begins when the Test and Calibration Mode is initiated This process starts with an automatic 10 minute pre warm period starting when the unit is powered on During this time the unit runs in Manual Mode with a 28 C water target temperature and a countdown timer displays how many pre warm seconds remain Additionally the average flow rate and average inlet pressure are displayed Approximately 55 seconds after initiating pre warm a bypass mode flow check is also performed For successful completion of pre warm to occur the following criteria must be met e The bypass mode flow check flow rate must be greater than 3500ml min A timeout error is immediately displayed if this condition is not met e The average flow rate must be within 600ml min of 2850ml min 9 e The inlet pressure average must be within 0 2psi of 7 0 psi e The bypass valve must be closed Once these conditions have been m
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