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Chapter 2 System Description

2–2

L2707

Technical Reference Manual

Vmax Encore

MAIN CIRCUIT BOARDS

As stated earlier, there are four main circuit boards in the Vmax Encore 229. Systems with fewer
hardware options may have fewer main circuit boards. Example: The Vmax Encore 20 has only two
main circuit boards.

Figure 2-2

Encore assembly top view

The four main circuit boards of the Vmax Encore 229 and their locations:

Circuit Board

Module Location

Mass Flow Sensor Board

Analyzer Assembly

Analyzer Control Board Analyzer

Assembly

Pressure Board

Analyzer Assembly

Solenoid Board

Pneumatics/Fan Assembly

Содержание Vmax Encore

Страница 1: ...L2707 Rev A 2005 VIASYS Respiratory Care Inc Technical Reference Manual Vmax Encore ...

Страница 2: ...eeFlow are trademarks of VIASYS Healthcare Inc Perma Pure is a registered trademark of Perma Pure Inc Nafion is a registered trademark of E I du Pont de Nemours and Company Microsoft and Windows are registered trademarks or trademarks of Microsoft Corporation Other brands and their products are trademarks of their respective holders and should be noted as such COMPANY INFORMATION www viasyshealthc...

Страница 3: ...thetics Service of this device is restricted to factory trained personnel EQUIPMENT CLASSIFICATION Classification of the equipment described in this manual Class 1 Type BF Defibrillator Proof ECG Module Type B Vmax and Vmax Spectra 62J 62W Mode of operation Continuous The Vmax Encore and Vmax Spectra 62J 62W comply with the Medical Device Directive MDD 93 42 EEC and have been approved to carry the...

Страница 4: ...Vmax Encore Technical Reference Manual iv L2707 ...

Страница 5: ...n Vmax Encore Series Overview 1 1 Vmax Instrument Configurations 1 1 System Components 1 6 Vmax Encore Series Specifications 1 16 Chapter 2 System Description General 2 1 Block Diagrams 2 5 Mass Flow Sensor Board 2 13 Analyzer Controller Board 2 26 Pressure Board 2 27 Solenoid Board 2 27 Chapter 3 Maintenance and Troubleshooting Maintenance 3 1 Troubleshooting 3 23 Replacement Parts 3 29 ...

Страница 6: ...Vmax Encore Technical Reference Manual vi L2707 ...

Страница 7: ...he Vmax Encore module can be positioned horizontally or vertically The module can have a high profile in the horizontal position a wide profile in the vertical position or the module can have a low profile in the horizontal position a narrow profile in the vertical position depending on the model The maximum height in the horizontal position width in the vertical position is 15 24 cm Vmax Encore 2...

Страница 8: ...NT The Vmax Encore 22 is designed to be used as a full featured Pulmonary Function instrument with the capability of controlling the Vmax Spectra 62J 62W Autobox The Vmax Encore 22 includes the following major components The Encore module containing the Analyzer Assembly and the Pneumatics Assembly Desktop or notebook computer Program software Printer Mass flow sensor Automated breathing valve 100...

Страница 9: ...ylinder with gas valve 26 oxygen calibration cylinder with gas valve 4 carbon dioxide 16 oxygen calibration cylinder with gas valve VMAX ENCORE 20c PULMONARY SPIROMETRY INSTRUMENT The Vmax Encore 20c is designed to perform the same tests as the Vmax Encore 20 instrument mentioned above but without the capability of controlling the Vmax Encore 62J 62W Autobox VMAX ENCORE 22d PULMONARY FUNCTION ANAL...

Страница 10: ...nal Assessment instrument with the capability of controlling the Vmax Encore 62J 62W Autobox The Vmax Encore 29n includes the following major components The Encore module containing the Analyzer Assembly and the Pneumatics Fan Assembly Desktop or notebook computer Program software Printer Mass flow sensor Dilution canopy 26 oxygen calibration cylinder with gas regulator 4 carbon dioxide 16 oxygen ...

Страница 11: ...e tests as the Vmax Encore 229 instrument mentioned above with the exception of Diffusing Capacity testing which is not provided The Vmax Encore 229lv has the same components as the Vmax Encore 229 except the Analyzer Assembly does not contain a Multi gas analyzer and DLCO mix calibration gas is not included VMAX ENCORE 229n CARDIOPULMONARY EXERCISE TESTING INSTRUMENT The Vmax Encore 229n combines...

Страница 12: ...n the Vmax Encore 20 Pulmonary Spirometry Instrument Pressure Transducers 3 Barometric Pressure Transducer Direction Pressure Transducer Mouth Pressure Transducer Temperature Transducer Mass Flow Sensor Input Box Pressure Input Vmax Encore 22 Pulmonary Function Analysis Instrument Measurement components in the Vmax Encore 22 Pulmonary Function Analysis Instrument Pressure Transducers 3 Barometric ...

Страница 13: ...Pulmonary Function Cardiopulmonary Exercise Testing Instrument Measurement components in the Vmax Encore 229 Pulmonary Function Cardiopulmonary Exercise Testing Instrument Pressure Transducers 3 Barometric Pressure Transducer Direction Pressure Transducer Mouth Pressure Transducer Temperature Transducer Mass Flow Sensor Input Box Pressure Input Multi gas Analyzer O2 Sensor CO2 Analyzer All Systems...

Страница 14: ...Valve for Oxygen and Diffusion Gases Perma Pure Calibration Tubing Vmax Encore 29 Metabolic Measurement LC Cart Pneumatic components in the Vmax Encore 29 Metabolic Measurement LC Cart Solenoid Valves 5 Mixing Chamber Blower Combination Unit with Mass Flow Sensor Adapter Blower Failure Alarm with 9V Battery Perma Pure Calibration Tubing Vmax Encore 229 Pulmonary Function Metabolic LC Cart Pneumati...

Страница 15: ...nce of connector and cable resistance in the measurements The Mass Flow Sensor uses two metallic filaments to sense gas flow rate a sensing filament and a reference filament The reference filament tracks the temperature of gas whereas the sensing filament is maintained at a preset temperature above that of the reference filament As gas flows through the sensor the gas molecules remove heat from th...

Страница 16: ...gth of each band is carefully chosen to measure only the desired gas O2 Sensor The oxygen sensor works on the principle of the electrochemical mechanism It consists of a metal lead as the anode and a potassium hydroxide solution as the electrolyte CAUTION During the course of servicing the equipment wear eye and hand pro tection if you notice liquid on or around the O2 sensor and heed all safety n...

Страница 17: ...d of in accordance with Federal State and Local environmen tal control regulations The fast response oxygen sensor is based on the electrochemical principle The sensor provides the fast response time necessary for real time breath by breath gas analysis During operation the oxygen is reduced at the cathode generating a current that is proportional to the oxygen content in the sample CARBON DIOXIDE...

Страница 18: ...O The pneumatically driven valve automatically switches the patient between the various breathing circuit configurations and between room air and the test gases The computer program determines timing and control The valve is mounted on the flow sensor and is easily disinfected ONE WAY BREATHING VALVE The One way Breathing Valve is used for mixing chamber exercise testing The valve employs silicon ...

Страница 19: ...atient s exhaled gas pass through a Perma Pure drying tube before entering the gas analyzers The absorption and evaporation properties of the Nafion material in the drying tube ensure that the relative humidity in the exhaled gas and in the calibration gas is equilibrated to ambient conditions room air when they are sampled in the analyzer This results in a high degree of accuracy in the actual ga...

Страница 20: ...be calculated DIRECTION PRESSURE SENSOR A direction pressure sensor is located in the Analyzer Assembly to determine the direction of the flow signal This sensor provides for automatic detection of inspiratory and expiratory volumes MOUTH PRESSURE SENSOR A mouth pressure sensor is located in the Analyzer Assembly to measure respiratory pressures at the mouth ANALOG I O POD An Analog I O Pod is pro...

Страница 21: ...Encore L2707 1 15 Chapter 1 Introduction CALIBRATION SYRINGE Figure 1 3 Calibration Syringe The 3 0 liter calibration syringe is included with the system for performing volume calibration verifications and quality assurance procedures ...

Страница 22: ... instructions refer to the section O2 Sensor on page 1 10 Table 1 1 Flow Volume Gas Measurements Flow Volume Type Mass Flow Sensor Range 0 16 LPS Resolution 0 003 LPS from 0 20 16 LPS Flow accuracy 3 of reading or 0 25 LPS whichever is greater across the range of 0 2 to 12 LPS Volume accuracy 3 of reading or 0 050 L whichever is greater Resistance 1 5 cmH2O LPS at 12 LPS O2 Analyzer Type Electroch...

Страница 23: ...ions Table 1 2 Transducers Flow Direction DIR Range 2 cmH2O Mouth Pressure PM Range 300 cmH2O Accuracy 1 full scale Barometric Sample Pressure BP Range 300 800 mmHg Accuracy 3 mmHg Temperature TEMP Range 0 40ºC Accuracy 1 C Dilution Flow Blower 12 60 LPM Manual ON OFF switch Hi Low O2 CO2 Flow Alarms Table 1 3 Environmental Requirements Operating Temperature 5 40ºC Humidity 15 95 non condensing St...

Страница 24: ...e for constant VO2 VCO2 stability 10 100 LPM Temporal Alignment Verification System Integrity Table 1 5 Electrical Requirements Voltage 100 V AC to 240 V AC Frequency 50 60 Hz Phase Single Current Console Max 12 A at 115 V AC Leakage current 500 microampere at 240 V AC 300 microampere at 120 V AC Table 1 6 Dimensions and Weights Modules each 38 1 cm high x 15 25 cm wide x 38 1 cm deep 15 in x 6 in...

Страница 25: ... L2707 1 19 Chapter 1 Introduction Table 1 7 Standards1 1 Approvals apply to some or all instruments Quality System Registration ISO 13485 CMDR FDA 510 k market clearance MDD 93 42 EEC CE marked Electrical Safety EN 60601 1 EMC EN 60601 1 2 ...

Страница 26: ...Vmax Encore Technical Reference Manual 1 20 L2707 ...

Страница 27: ...try The most feature packed Vmax Instrument the Vmax Encore 229 has only four circuit boards and eight hardware devices enclosed in one module This module houses the analyzer assembly and the pneumatics assembly Systems with fewer capabilities may have fewer components Since the Vmax Encore 229 has the hardware features of all Vmax Encore Series instruments it will be used to describe the individu...

Страница 28: ...ware options may have fewer main circuit boards Example The Vmax Encore 20 has only two main circuit boards Figure 2 2 Encore assembly top view The four main circuit boards of the Vmax Encore 229 and their locations Circuit Board Module Location Mass Flow Sensor Board Analyzer Assembly Analyzer Control Board Analyzer Assembly Pressure Board Analyzer Assembly Solenoid Board Pneumatics Fan Assembly ...

Страница 29: ...ill be dis cussed later with their respective analyzers With the exception of the Solenoid Board each main circuit board has been designed for all Vmax Encore Series instruments There are several versions of the Solenoid Board for various Vmax Encore Series instruments Each of these Solenoid Boards is populated with a different set of solenoid valves for different Vmax Instrument configurations Fi...

Страница 30: ...ocations are Hardware Device Module Location Sample Pump Analyzer Assembly CO2 Analyzer Analyzer Assembly O2 Sensor Analyzer Assembly Multi gas Analyzer Analyzer Assembly DC Power Supplies 5 V DC 15 V DC 15 V DC 24 V DC Analyzer Assembly Blower Fan and Alarm Assembly Pneumatics Fan Assembly Demand Valve Pneumatics Fan Assembly 3 Way Valve SV0 Pneumatics Fan Assembly ...

Страница 31: ...ardware options will be discussed in subsequent block diagram descriptions VMAX ENCORE 229 BLOCK DIAGRAM The Vmax Encore 229 is a pulmonary function cardiopulmonary exercise testing instrument As stated earlier this is the most feature packed system of all Vmax Encore Series instruments The Vmax Encore 229 contains a complete set of hardware devices all available devices for the Vmax Encore Series...

Страница 32: ... types listed below From gas cylinders during the calibration of the gas analyzers From patient s exhaled breath during various tests For a description of the circuitry that operates the sample pump see the section Analyzer Control Board on page 2 7 O2 Sensor The O2 Sensor measures the amount of oxygen in the gas sample It is utilized during the following tests along with their respective calibrat...

Страница 33: ...s Mass Flow Sensor Board The Mass Flow Sensor Board is the largest circuit board in the Analyzer Assembly It is host to a multitude of functions such as housing the Mass Flow Sensor conditioning circuitry and the barometric pressure transducer It conditions all pressure transducer signals controls the system logic multiplexes all system signals and converts system signals from analog to digital An...

Страница 34: ...sembly with Alarm Transducer The Blower Fan Assembly is mounted in the Pneumatics Fan Assembly It acts as the mixing chamber in nutritional assessment and mixing chamber exercise studies The fan in this assembly is the dilution fan used to pull gas usually room air across the patient s face in a dilution study The Alarm Transducer is mounted to this assembly on the left side facing the front of th...

Страница 35: ...ests and calibrations Figure 2 5 Vmax Encore 29 Block Diagram Pump and Analyzers Assembly The Pump and Analyzers Assembly in the Vmax Encore 29 differs from the one in the Vmax Encore 229 in two respects listed below It does not have a multi gas analyzer The mounted devices the sample pump the O2 sensor and the CO2 analyzer are utilized only during the following tests Cardiopulmonary exercise test...

Страница 36: ...nstrument and are installed only when ordered as an option Demand valve 3 way valve VMAX ENCORE 22 BLOCK DIAGRAM The Vmax Encore 22 is a Pulmonary Function Analysis Instrument The modules of this system contain only those hardware devices necessary to perform Pulmonary Function tests and calibrations Note The blower fan assembly is only used during metabolic measurement tests This device is not st...

Страница 37: ...Lung Volumes tests and calibrations Single Breath O2 tests and calibrations CO2 Analyzer The CO2 Analyzer measures the amount of carbon dioxide in the gas sample It is utilized during the following tests along with their respective calibrations N2 Washout Lung Volumes tests and calibrations Single Breath O2 tests and calibrations Multi gas Analyzer The Multi gas Analyzer measures the amount of car...

Страница 38: ...cessary to perform Pulmonary Function spirometry tests and calibrations Figure 2 7 Vmax Encore 20 Block Diagram Hardware Devices Not Installed Being a spirometry only system the Vmax Encore 20 has no need for sample pumps or gas analyzers or the circuit board that controls any of those devices Therefore none of these devices are installed Analyzer Control Board Pump and Analyzers Assembly The foll...

Страница 39: ...elow is an enumerated list of the board s functions As stated earlier in the General description of this chapter the Mass Flow Sensor Board is the largest circuit board in the Analyzer Assembly It is host to a multitude of functions such as housing the Mass Flow Sensor conditioning circuitry and the barometric pressure transducer It conditions all pressure transducer signals controls the system lo...

Страница 40: ...ltiplexed signal from Analyzer Control Board EX2 Not Used SYSTEM LOGIC AND DATA FLOW The System PC communicates with the Vmax Instrument through a bi direction parallel printer port From this port eight data lines and two control lines are used to direct data to or from the PC The Vmax system logic consists of a read write control circuit a bi directional bus transceiver bus buffer an address latc...

Страница 41: ...6 channels from the multiplexer on the Analyzer Control Board multiplexed into EX1 Address Latch and Address Decoder The address latch is used in conjunction with the address decoder and address write state to select the Mass Flow Sensor zero the Mass Flow Sensor clean the data latch the A D converter and the Analyzer Control Board s valve select circuitry Data Latch The data latch is used in conj...

Страница 42: ...re unaffected by changes in air pressure or temperature Figure 2 9 Mass Flow Sensor Circuit The electronic circuit of the Mass Flow Sensor monitors the resistance of sensor filaments to determine their temperatures so it is important that only the resistances of the filaments be measured A new technique Kelvin Sensing and exclusive design are incorporated in the Vmax Encore Mass Flow Sensor to eli...

Страница 43: ...mplifier A2 has a gain of 4 and is used to provide current to the sensor wires Auto Clean The sensor wires of the transducer are automatically cleaned of deposits from the lung and mouth by intense heating when Clean is selected from the Vmax Mass Flow Sensor Calibration screen During the Clean function the computer provides a logic 0 to Q1 which in turn causes Q2 to conduct Q2 then energizes K1 w...

Страница 44: ...ltage Gain Correction Calibration This chapter covers the calibration and verification of flow volume and calibration of plethysmograph pressure Note Calibrate the system at least once every testing day to ensure accurate test results Calibration Setup Vmax and Autobox 1 Select 1 Flow Sensor Calibration on the Vmax Program Manager screen to access the Flow Volume Calibration screen Note For inform...

Страница 45: ... Mass Flow Sensor Zero dialog box 3 Connect the Mass Flow Sensor to the syringe and do a room air purge by performing two complete strokes 4 Select Spacebar to Continue The flow sensor automatically goes through a stabilizing and zeroing process When this process is complete the Calibration Bar Graph is displayed 5 Perform inspiratory and expiratory strokes within the following target ranges 0 to ...

Страница 46: ...se strokes at the ATS American Thoracic Society recommended flow rates Four of the five strokes are displayed and should appear as follows One stroke inspiratory and expiratory should reach the lowest dotted line 0 5 LPS One stroke inspiratory and expiratory should reach the highest dotted line 3 0 LPS One stroke should be halfway between the dotted lines 1 5 LPS One stroke the fourth stroke shoul...

Страница 47: ...spiratory and expiratory should reach the highest dotted line 3 0 LPS One stroke should be halfway between the dotted lines 1 5 LPS One stroke the fourth stroke should include a peak flow rate near 12 LPS 8 LPS minimum This stroke should be created without banging the piston at either end of the stroke Plethysmograph Pressure Calibration Procedure Note This procedure applies only to the Autobox No...

Страница 48: ...ration strokes red followed by sixteen verification strokes blue When the procedure is complete the Vbox and Pm values will be updated 4 Verify that the Target values for Vbox and Pm are within the range 97 to 103 If the values are not within this range repeat the calibration In addition to displaying the Target values the computer evaluates the correction factors calculated during the calibration...

Страница 49: ...and Door is Closed This message means that one or both of the calculated calibration factors are out of range The acceptable range for Vbox varies with the barometric pressure but is approximately 0 7 to 1 3 at sea level The acceptable range for Pm does not vary with barometric pressure and is always 0 7 to 1 3 Selecting F1 restarts the calibration routine This encourages you to do another calibra...

Страница 50: ...ill be updated 4 Verify that the Target values for Vbox and Pm are within the range 97 to 103 If the values are not within this range perform a complete pressure calibration Verification The 3 liter syringe may be operated a second time to determine that the gain adjustments were made properly The verification should be utilized occasionally during the day to determine that atmospheric changes tem...

Страница 51: ...ure compensated pressure sensor with a 0 15 PSI 0 776 mm Hg sensing range The supply voltage for the sensor is 10 V dc supplied by the reference voltage generator circuitry also on the Mass Flow Sensor Board The maximum output voltage is 100 mV and the per volt sensitivity is 6 67 mV The signal conditioning circuitry for the pressure sensor consists of 4 op amps The first two stages U13 A and U13 ...

Страница 52: ...ti gas Analyzer Provide Source voltages for the CO2 and the Multi gas Analyzers Provides switchable off and on 5 V dc to the sample pump Provides multiplexing of the following signals to the Mass Flow Sensor Board as EX1 8 analog inputs from External I O pod 3 ECG analog signals through the External I O pod from ECG pod 4 analyzer output signals from item 1 above Provides 3 TTL control lines to th...

Страница 53: ...lators for Cal 1 and Cal 2 gasses It busses all the solenoid drive signals from the Analyzer Control Board It also houses the It busses drive signals for the Demand Valve Assembly It also busses the variable drive signal for the blower fan and the Alarm from the Analyzer Control Board The functions of the solenoid valves are listed below Sol 1 Not Used Sol 2 Not Used Sol 3 Switches between Cal gas...

Страница 54: ...Vmax Encore Technical Reference Manual 2 28 L2707 ...

Страница 55: ... revision of Vmax Vision software being used 4 Perform a Standard SCANDISK on the C drive from the C of the computer 5 Perform a Defrag on the C drive from the C of the computer PRINTER Clean the interior and exterior surfaces Perform a printer self test and ensure proper printing BATTERY ALARM TEST With the main power of the instrument turned OFF turn ON the fan control switch that is located at ...

Страница 56: ...ext select A Lung Volumes on the Pulmonary Function menu to display the Lung Volumes Test screen 2 Select Syringe Verify from the Test menu The FRC Verify Calibration Setup Box is dis played 3 Enter the FRC Volume of the calibration syringe to be used in the FRC Syringe Volume Box The FRC volume should be noted on the label of the syringe Note Do not adjust the FRC Factor at this time 4 Select F3 ...

Страница 57: ...ing the piston slowly pulling the piston shaft all the way out then pushing it back in to the etched line This is the stroke vol ume for the FRC Verification about 1 3 the full stroke volume Try to be as accurate as pos sible pulling the piston all the way out then pushing it back in to the etched line Note During the FRC Verification procedure the Lung Volumes Test screen is identical to screen d...

Страница 58: ...dicted If the Pred deviation is inconsistent or greater than 8 call technical support for assis tance LUNG VOLUME STANDARD CALIBRATION The Sensormedics Lung Volume Standard is the gold standard of isothermal volume control IVC devices It is an optional quality assurance tool that can be used to verify the accuracy of VTG measurement calibration This self contained unit is designed to be placed ins...

Страница 59: ...c pressure tube on the top of the Lung Volume Standard 3 Close and securely latch the cabin door 4 Perform a Plethysmograph Pressure Calibration with the Lung Volume Standard in the patient enclosure as described in the plethysmograph pressure calibration section of the Mass Flow Sensor calibration procedure 5 Select F4 from the Plethysmograph Pressure Calibration Menu to display the Isothermal Vo...

Страница 60: ... Release the foot switch The calculated VTG volume of the four displayed loops is shown in the data box at the top of the screen The average of the four loops is displayed under Mean The mean value is compared to the target value and expressed as a percent under Target 10 Verify that the Target value is within the range of 97 103 If the values are not within this range repeat the procedure To prin...

Страница 61: ...re reading with a calibrated barometer 2 Verify that the PBAR reading is 0 5 from actual reading taken in the previous step 3 If adjustment is necessary connect the POSITIVE lead of the DVM to TP1 Pbar and adjust R17 for Barometric Pressure mm Hg 100 V dc 01 that is 760 mm Hg 100 7 6 V dc Record the Pbar number 4 Turn on the sample pump by putting a check mark in the white box and then record the ...

Страница 62: ...al Gas 1 Supply OFF Pressure should not drop by more than 100 PSI within 2 minutes If so locate source of leak and correct c Turn Cal Gas supply ON when Leak Test is verified to be OK d Perform same operation for Cal Gas 2 supply MASS FLOW SENSOR BOARD ADJUSTMENT PROCEDURES The test points and adjustment potentiometers for the procedures listed below are located on the Mass Flow Sensor Board The v...

Страница 63: ... L2707 3 9 Chapter 3 Maintenance and Troubleshooting Access the Diagnostics Test Screen To access the diagnostics test screen from the Vmax Program Manager screen select Diagnostics from the menu bar Figure 3 5 Vmax Diagnostics Test Screen ...

Страница 64: ... and the neg ative lead to TP8 analog ground 2 With a calibrated thermometer record the ambient room temperature in degrees Celsius 3 Adjust R45 to ambient temperature in degrees Celsius 10 V dc 0 01 V dc Example If the ambient temperature is 23 5 C adjust R57 to 2 35 V dc Barometric Pressure Transducer Adjustment The barometric pressure transducer must be adjusted to match the ambient barometric ...

Страница 65: ...F7 Pressure Zero on an X in the box next to the label 5 Using a calibrated pressure manometer inject 150 cm H2O at the DIR connector red port in the rear of the Analyzer Assembly 6 Adjust R69 to 3 5 V dc 0 05 V dc The pressure should not decay by more than 3 cm H2O after 1 minute If it does there is a leak that must be identified and corrected before this procedure can be completed 7 Repeat steps ...

Страница 66: ...3 7 Analyzer Control Board Component Layout As with the Mass Flow Sensor Board adjustments the test points and adjustment potentiometers for the procedures listed below are located on the Analyzer Control Board The voltages can be monitored with a voltmeter at the designated test points or by viewing the voltages on the Diagnostics Test screen ...

Страница 67: ...ed to ensure proper operation The adjustment procedure is outlined below 1 On the Analyzer Controller board connect the DVM positive lead to TP2 CO2 and the neg ative lead to AGND analog ground 2 Turn on the sample pump by pressing F6 Sample Pump an X in the box next to the label 3 Adjust R38 to 0 00 V dc 0 50 V dc 4 Turn off the sample pump by pressing F6 Sample Pump a blank box next to the label...

Страница 68: ...before removing the cover of the unit Removing the cover without removing the power will expose a poten tial electrical shock hazard that could result in serious injury or death CAUTION During the course of servicing the equipment wear eye and hand pro tection if you notice liquid on or around the O2 sensor and heed all safety notices that are included in the procedure For important safety informa...

Страница 69: ...nical Reference Manual Vmax Encore L2707 3 15 Chapter 3 Maintenance and Troubleshooting Figure 3 8 Cover Screws 3 Unfasten the strap that secures the O2 sensor which is at the front of the module Figure 3 9 ...

Страница 70: ...al Vmax Encore Figure 3 9 Sensor Retaining Strap 4 Disconnect the ribbon cable by carefully pushing outward on the two locking ears of the connector Figure 3 10 CAUTION Do not twist or pull the ribbon cable up or down Twisting or pulling the cable could damage the connector pins ...

Страница 71: ...Technical Reference Manual Vmax Encore L2707 3 17 Chapter 3 Maintenance and Troubleshooting Figure 3 10 Ribbon Cable Connection 5 Disconnect the luer fittings Figure 3 11 Figure 3 11 Luer Fittings ...

Страница 72: ...Note Notice the slot on the bottom of the sensor connector Figure 3 12 This slot must face downward as you seat the new O2 cell into the cradle so that the cable connector attaches correctly Figure 3 12 O2 Sensor Connector 9 Position the O2 Sensor in the cradle and reconnect the luer fittings to the sensor 10 Carefully connect the ribbon cable to the O2 sensor close the locking ears to secure the ...

Страница 73: ...change by more than 0 6 psi Record the reading 6 Turn off Valve G Measure and record the pressure after 30 seconds at the gas port of the two lumen tube The pressure may not decrease by more than 0 1 psi Turn off valve E 7 Turn on valves G and F Measure and record the pressure at the spirometry port of the two lumen tube 8 Turn valve G off and record the pressure after 30 seconds The pressure may ...

Страница 74: ...instead of the actual test points The corresponding channel descriptor can be found in parenthesis next to the test point number in the step 1 Ensure that the Autobox is in communication with the Vmax by reviewing the analog channel voltages and enabling all control lines There should be an audible click for each of the sole noids Press F10 to reset all 2 Connect the DVM positive lead to TP1 Temp ...

Страница 75: ...e 1 From the main menu select Flow Sensor Calibration and then F4 Box Calibration Con nect the 3 liter syringe to the top port on the outside of the V6200 cabin Close the door of the box and close the leak stopcock by turning it clockwise 2 Select F6 Box Leak Time Constant Perform the box leak check by fully extending the syringe piston The box leak should be 10 to 14 seconds for inspire Repeat th...

Страница 76: ...fy portion of the calibration procedure after all flow rate target zones are met The four verify strokes must be performed at approximately 0 5LPS 1 5LPS 4 6LPS and a fourth stroke with peak flow greater than 10LPS on both the inspire and expire portions of the piston stroke Ensure that the strokes are smooth with out banging the ends The dotted lines on the display are positioned at 0 5LPS and 3L...

Страница 77: ... 10 0 V dc 10 0 V dc BAROMETRIC PRESSURE TRANSDUCER The barometric pressure transducer is mounted on the Mass Flow Sensor board Four op amp circuits that make up IC U13 condition the transducer signal To troubleshoot the barometric pressure transducer check the op amp outputs at U13 pins 1 7 8 and 14 MOUTH PRESSURE TRANSDUCER The mouth pressure transducer is mounted on the pressure board The trans...

Страница 78: ...Display window To open the Test Display window click Diagnostics in the Program Manager window Figure 3 13 or click Test in the Volume Calibration window Figure 3 13 Program Manager window Examples of the Test Display window are given on the following pages After the examples the input and output signals are defined Figure 3 14 Test Display window Encore on an arm non Autobox in an uncalibrated st...

Страница 79: ...y window Encore on an arm non Autobox in a calibrated state Figure 3 16 Test Display window Encore connected to an Autobox 0516002 Figure 3 15 depicts a Test Display window of an Encore on an arm non Autobox in a calibrated state 0516004 Figure 3 16 depicts a Test Display window of an Encore connected to an Autobox ...

Страница 80: ...Displays the status of the F1 remote start button 5 volts represents button not pushed or activated 0 volts represents activation 15 Used to detect Vmax If more than 14 volts isn t present then problem with connection of Vmax Vol Used to analyze 922 1022 volume O2 Oxygen sensor output CO2 Carbon Dioxide sensor output CH4 Methane sensor output C2H2 Acetylene sensor output CO Carbon Monoxide sensor ...

Страница 81: ...n back of module unchecked and Calibration port on the front of the module checked B Dil Cal Sample Switches between the mixing chamber unchecked and the calibration port on the front of the module checked C Hi Lo Sample Used for calibration Used to determine the pressure effects on the O2 sensor D Venturi Forces evacuation of the balloon valves E Gas Port Inflates the left balloon valve when chec...

Страница 82: ...o work when balloons inflated and Q is disabled the balloons should stay inflated R Calibrator Turns on the Autobox calibration piston S DL O2 Cal If checked and DLCO L is checked then DLCO gas will be sent through the calibration circuit If checked and DLCO L is unchecked then O2 gas will be sent through the calibration circuit T Cal 1 Turns on cal 1 gas U Insp Test Gas Allows test gas to be insp...

Страница 83: ...fications 769296 Adapter IEC Power Cord set HP Deskjet IEC M to US F 6 In Adapts HP Deskjet Power Transformer to plug into IEC Isolation Transformer 769299 Adapter Max Pressure Fits into the Breath by Breath port of the Mass Flow Sensor Used as a Calibrated leak for the Min Max Respiratory Pressures tests 769692 Arm assy for console 775141 Cable assembly external flow Vmax Encore 62J 62W M 775365 ...

Страница 84: ...x Encore Console and Wall Outlet 769663 Cord set Power Locking Straight Vmax Encore Table Components 6 Ft Desktop PC Desktop Monitor and Printer Power Cord when configured as Vmax Encore Table System Connects PC Monitor and Printer to Table s IEC Isolation Transformer 769744 Coupler Rubber For Mouthpiece Assembly 2 50 Lg 42108 Drier tube assembly 769103 Filter MicroGard Single Patient Bacterial Fi...

Страница 85: ...erfacing external devices 769259 Luer Plug Assembly Fits into Breath by Breath and Mouth Pressure Ports of the Mass Flow Sensor when those ports are not being used 770069 Mouthpiece Cardboard Large Disp Box Of 150 Wax Coated Mouthpieces 42157 O2 cell yearly replacement 466744 Regulator Cal1 Cal2 0 50 p s i ED 8D Used on Cal1 and Cal2 tanks 770063 Regulator DLCO 0 80 PSI Used with DLCO gas tanks 46...

Страница 86: ...ng 3 32 L2707 Technical Reference Manual Vmax Encore Valve Assembly One Way Breathing Modified Hans Rudolph Valve Used for Metabolic Tests in Mixing Chamber Exercise and Indirect Calorimetry Modes 769704 Valve 2 way 775323 Valve 3 way 775321 ...

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