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AP200 CO2/H2O Atmospheric Profile System

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1. A 2 A 5 AC DC adapter output cable plugged into cable extension A 3 Beal SWwasclo IS B 3 B 2 Front and back Swagelok ferrules ooooonnnnnnnnicicinocononoononaoooororrnonnnoos B 3 BF 8Swagelok A dense entepannss B 4 B 4 A Swagelok cap and inserted plug B 4 C 1 107 L temperature probe mounted with radiation shield C 1 TEL RIGA SU Ss 48 AAA us een 48 B 1 Available Plastic Tubing Sizes Construction and Usage O Re eee B 2 B 2 Dimensions and Part Numbers for Swagelok Inserts nnn0000 B 3 B 3 Dimensions and Part Numbers for Swagelok Ferrules B 3 B 4 Dimensions and Part Numbers for Swagelok Plugs B 4 B 5 Dimensions and Part Numbers for Swagelok Caps B 5 D 1 Profile Sequence timing Variables ccccccccseeseeeeeeeeeeeeeeeeeeees D 1 D 2 System Configuration Variables of Zero Span D 3 D 3 Timing for Zero Span Sequence check only ooooocccccnccccaccooooono conos D 4 D 4 Timing for Zero Span Sequence setting the IRGA D 5 E 1 Summary of Bit Numbers Indicating Conditions Outside Normal Operating Range dicots sn tt E 1 REL Public Vinalesa sa F 1 G 1 Variables of the IntAvg Table G 1 G 2 Variables of the CalAvg Table G 4 G 3 Variables of the SiteAvg Table G 6 G 4 Variables of the RawDataTable cooonnnnn
2. Mounting Control Maximum pumping speed Pressure sensor range Heater Warm up time Fan Valve Manifold Mounting Inlets Connections Mass Flow Sensor Heater Warm up time Fan 4 3 3 Intake Assembly Dimensions Weight Filter Orifice Orifice heater Mixing volume Sample connection Heater cable entry seals Number of connections Cable diameter Heater cable screw terminals Wire diameter Wire stripping length Screw tightening torque Dual head diaphragm pump with a brushless DC motor Mounted n an insulated temperature controlled box inside system enclosure Pumping speed s automatically controlled to maintain the pump inlet pressure at the set point 9 0 liters per minute LPM 15 0 kPa to 115 0 kPa 8 0 W turns on off at 2 C Approximately 50 minutes from 30 C to 2 E 0 7 W turns on at 50 C and off at 45 C Mounted inside system enclosure Eight air sample inlets plus one inlet for zero one inlet for CO span and one inlet for H O span 0 25 n Swagelok 0 to 1 0 standard liters per minute SLPM 8 0 W turns on off at 5 C Approximately 20 minutes from 30 C to 4 C 0 7 W turns on at 45 C and off at 43 C 31 0 cm x 12 5 cm x 19 0 cm 12 0 in x 5 0 in x 7 5 in 1 4 kg 3 1 1b 1 0 in diameter sintered stainless steel disk filter 10 micron pore size CSI pn 27809 0 007 in inside diameter 2 0 kohms 0 07 W at 12 Vdc 750 ml 0 25
3. 8 4 10 CR1000KD handheld keyboard display ooooccnnnnnnninininnnnnnnnnnnnnnnnnnnos 8 4 11 Disk Filter of AP200 intake assembly 9 4 12 Single desiceant PACK ee ds 10 4 13 Homidiy mdicator Caral 10 4 14 Plumbing diagram of AP200 system 11 4 15 AP200 intake assembly shown open 12 4 16 Nominal ambient pressure as related to increasing elevation 12 4 17 Nominal sample flow rate as related to increasing ambient pressure 13 4 18 Valve module and Swagelok feedthrough fittings on bottom of ARZOO Ci CIOS UES seen 14 4 19 Pump module of AP200 system occcccccccccnccncccccnonicinnnnnnnnnnnnnnnnnnnnnnnnos 15 4 20 Average power output relative to temperature 00000000000000000000000 17 5 1 Installation showing mounting hardware of AP200 system enclosure on UT 3010 Wer are E 20 5 2 Installation of AP200 intake assembly on a UT30 towel ueeen 21 5 3 Rain diverter from an AP200 intake assembly 0ooooococccccccccacacaaaaaoaon nooo 21 5 4 Tubing connections on bottom of AP200 enclosure 22 5 5 Labeled inlet connections inside enclosure oooocccnccccccnnnnonnnanoncnonoss 23 5 6 Tubing connections from four intake assemblies connected to 1 LOS ES E E E A AEE E E EEA E T 23 5 7 AP200 system enclosure configured with cylinders of zero air And CO ZA sunshine 24 5 8 H2O span inlet configured for a dew point generator 25 5 9 AP200 earth grou
4. take Assembles Aa er nr eee cena heres 20 22 A ee ne 22 32 1 Profile Sample Tubes Hs ee le 22 3 22 Z to nd COS DMA 24 525 EP OS DA ea 25 II NN IE eee ace eee ee tee 25 531 Ground CON O ie rte 25 3552 Intake Healer Cables danita 26 33 3 PO WO 30 5 4 Contioure the Prosti rss 32 5 4 1 System Configuration Variables 33 342 Complle Wilson 35 5 5 Starting and Stopping the SequencCe oocccccccccccnnnnnnnnnnonononnnnnnnnononononos 35 HO Nen Perro Mane Ge OOOO POR ONE PO 36 5 6 1 Quick Status Check Using a Keyboard Display 36 5 6 2 Checking Status Remotely 2 37 5 6 3 ORESIe SySIeCHEcKs dni 37 AP200 Table of Contents 6 Infrared Gas Analyzer IRGA Zero and Span 39 6 1 Automatic Zero and Span 38 6 2 Manual Zero and Span ccccccncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnoss 39 6 2 1 Check Zero and CO Span a 39 022 DOCU and Hs OZ Ci ee rn 40 02223 DOCO Pai tt 4 624 DO AOS ee ee 41 02 3 Restart the Sequence rinnen 44 620 CHECK The Sy Stein sans 44 7 Maintenance and Troubleshooting 44 Dds Pumpe Leiks nenne 44 12 Enclosure DESC ME see 45 Ted Intake Filter essen 45 TA LESA te ee eee 46 7 4 1 Installing and Removing the IRGA essen 46 74 2 Contouring the IRA te ne te 47 1 5 SN Sen 48 D ODA ne
5. Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Scientific Ltd CSL Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UNITED KINGDOM www campbellsci co uk sales campbellsci co uk Campbell Scientific Ltd France 3 Avenue de la Division Leclerc 92160 ANTONY FRANCE www campbellsci fr info campbellsci fr Campbell Scientific Spain S L Avda Pompeu Fabra 7 9 local 1 08024 Barcelona SPAIN www campbellsci es info campbellsci es Please visit www campbellsci com to obtain contact information for your local US or international representative
6. The interpretation of this average given as diag AP200 Avg is slightly different than the original variable diag AP200 E 1 Appendix E AP200 Diagnostics for two reasons First 1t represents only the samples that are included in the averages see Appendix D for timing details Second because it 1s an average over time 1t is impossible to tell which bits are set For example an average of 4 0 could mean that bit 3 numeric value 4 1s set all the time or 1t could mean that bit 4 numeric value 8 1s set half the time etc For this reason diag AP200_Avg can indicate only whether or not there was a problem nonzero value or not If diag AP200_Avg is nonzero use the time series of diag AP200 in the RawData table to diagnose the problem The following sections give details on each of the diagnostic bits Bit 1 Battery voltage is too low If bit 1 of diag AP200 is set this indicates the power source for the AP200 has dropped below the acceptable voltage limit This triggers the AP200 to power down as much of the system as possible to protect the user s battery from a deep discharge that might damage the battery The pump valves pump and valve heaters and fans and intake heaters will all be turned off The IRGA is powered directly so 1t cannot be turned off The AP200 will power up again when the supply voltage reaches an acceptable level There are two system configuration variables BATT_LOLIMIT and BATT_DEADBAND that det
7. through the manual zero span process Each line in a menu 1s either a submenu or 1t displays or edits a public variable At the top level AP200 menu select Manual Zero Span The Manual Zero Span menu has four submenus that should be visited in the order listed Manual Zero Span Check Span Zero Do Zero CO28H20 Do CO2 Span Do H20 Span seq ACTIVE valve number STARTsequenc After the steps on the four submenus are completed there are three lines to restart the valve switching sequence The following section provides details on this procedure 6 2 1 Check Zero and CO Span At the Manual Zero Span menu select lt Check Span Zero gt This menu guides you through the steps to flow the CO span and zero gases to assess the current state of the IRGA Check Span Zero seq ACTIVE STOPsequence valve number CO2 SPAN PPM diag AP200 CO2 H20 If seq ACTIVE is True then set STOPsequence True to stop the sequence and then verify that seq ACTIVE changes to False 39 AP200 CO H20 Atmospheric Profile System 40 Set valve_ number to Zero 9 Look at the LEDs on the valve module to confirm the selected valve 1s now active The CO2 SPAN PPM variable displays the concentration in the CO span tank Check the value of diag AP200 If it is not zero a problem in the AP200 system should be resolved before continuing see Appendix E AP200 Diagnostics Wait for the values of CO and H 0 to stabilize This norma
8. typically 20 scans 10 s The next arrays contain the corresponding values for the calibration zero span sequence TABLE G 5 Variables of the Timelnfo Table TIMESTAMP RECORD LEVELS USED MEASURE TANKS AUTO ZEROSPAN CAL INTERVAL CAL TIMEOFFSET TS RN min min sync_interval S ProfileSequence 1 ProfileSequence 2 D ProfileSequence 3 ProfileSequence 4 ProfileSequence 5 Fe ProfileSequence 6 O O ProfileSequence 7 ProfileSequence 8 Appendix G Output Tables Timelnfo Table ProfileOmitCounts 1 ProfileOmitCounts 2 ProfileOmitCounts 3 ProfileOmitCounts 4 ProfileOmitCounts 5 ProfileOmitCounts 6 ProfileOmitCounts 7 ProfileOmitCounts 8 Appendix G Output Tables TABLE G 5 Variables of the Timelnfo Table CalOmitCounts 2 CalOmitCounts 3 CalOmitCounts 4 o CalOmitCounts 5 O CalOmitCounts 6 CalOmitCounts 7 CalOmitCounts 8 Message log The message log table contains a history of events and is intended as a troubleshooting tool A record is written to this table when a predefined event occurs including Starting stopping the valve sequence Sending a command to the IRGA configuration zero or span Error messages related to IRGA commands Acknowledgement from the IRGA for these commands Changing the value of a system configuration variable In normal operation each calibration sequence with AUTO ZEROSPAN enabled will generate six records send and acknowledge fo
9. air Avg 5 all T air Avg 6 all T air Avg 7 all T air Avg 8 all SiteAvg The SiteAvg table saves the same data as the CalAvg table A record is written to the SiteAvg table when the automatic valve sequence switches to a new valve Records are also written to SiteAvg any time records are written to the CalAvg table This includes measurement of the zero tank before and after doing the zero for example The SiteAvg table 1s useful f a finer time resolution is desired either to see how CO and H O concentrations changed during a 30 minute averaging interval or to troubleshoot the system if a problem is detected Space is allocated on the card for 576 000 records 100 days at one record every 15 s The CPU has storage allocated for 576 records 2 4 hr at one record every 15 S TABLE G 3 Variables of the SiteAvg Table When used in When included in calculation table wow RR mm cell press Avg kPa Avg Name Units Statistic Td ambient Avg Appendix G Output Tables calculation table T pp canot ave ave gt l e l G 7 Appendix G Output Tables RawData The RawData table stores each sample of the AP200 data two records per second This table is normally used only for troubleshooting The files on the card and in the CPU are allocated to use remaining available space The number of days for which space 1s available on the card will depend on the options chosen The f
10. defines three constants that are used as compile switches These constants define which optional values are to be stored in the output tables MaxLevels MaxLevels defines the maximum number of profile levels The default is eight but it may be set to the actual number of levels used four to eight to avoid null data for unused levels in the IntAvg output table The number of levels measured is determined by system configuration variable LEVELS_USED SaveAll diagnostics If constant SaveAll diagnostics is set to False the default the RawData output table will contain only those values required for normal operation If it is set to True the AP200 will save some additional diagnostic values in output table RawData N_AirTemps Constant N_AirTemps determines the number of 107 L temperature sensors to measure It may be from one to eight or zero which 1s used to disable air temperature measurements The default is zero See Appendix C Temperature Profile for more details on adding a temperature profile measurement 5 5 Starting and Stopping the Sequence In normal operation the AP200 will automatically cycle through the profile inlets If configured for automatic zero span it will periodically run the calibration sequence and then return to the profile sequence The user may stop the sequence to control the valves manually and then restart the sequence using the public variables described below If any of the variables that control the
11. ee a in 49 Appendices A AP200 AC DC Adapter Kit A 1 B Using Swagelok FittingsS B 1 BL ASS mp o Ue e e B 1 B 2 Common Replacement Parts eera a a ei B 2 C Temperature Profile ocoocoocconcooo C 1 D Valve Sequence Timing D 1 E AP200 DIAQMOSUUCS una aa E 1 Fe PUDO VAllADICS 2 aa F 1 G Output Tables G 1 H Keyboard Display Menu H 1 I Useful EQUALIONS u a ee 1 AP200 Table of Contents Figures 4 1 Interior of AP200 system enclosure ccececcccecccesseeeeeeeeeeeeeeeeeeeeeeeeeeeees 3 4 2 Side view of AP200 intake assembly ooooonnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnno 3 4 3 The IRGA installed in the AP200 system enclosure 4 4 4 Campbell Scientific NL115 and CFM100 compact flash storage a O nt aacaceiee cts ieahnatemtantouee 4 4 5 CFMC2G 2GB CompactFlash memory card 5 4 6 AP200 keyboard display mounted in system enclosure 5 4 7 AC DC adapter kit installed in the AP200 ooonnnnnnnnnininicococonococicinininono 7 4 8 17752 USB memory card reader writer 7 4 9 107 L temperature probe mounted with radiation shield
12. either emailed to repair campbellsci com or faxed to 435 227 9106 Campbell Scientific is unable to process any returns until we receive this form If the form is not received within three days of product receipt or is incomplete the product will be returned to the customer at the customer s expense Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees AP200 Table of Contents PDF Viewers These page numbers refer to the printed version of this document Use the PDF reader bookmarks tab for links to specific sections 14 IHEFOQUCLON coat ista 1 2 Cautionary Statements 1 3 Initial INSPECLION a 2 4 OVEIVIEW innen nenn tines een 2 AA System Components ee ern 2 44 1 Standard COMPONENLS 2 LR Re nr nr 2 412 Optional Components ratios 4 4 13 is haat ancien LR AR Nr 6 4 14 OIN FACCESSOMES UE RL tr A 8 4 125 SUPPO Solware SUR nn es ee 9 4 156 Replicement PATES tt a 9 42 Theory OF Operation anne 10 4 2 1 Intake Assemblies dd 12 422 N alye Manifold eiere A enegeehe 14 423 Pump Modulada 15 4 3 SD CILICAHOMS Rs nn nn en on ane 17 Ak COs Els O Analy 260 Ae 17 43 2 System Encl sure en 17 43 3 take Ass mb ea ne 18 Di Installation nenne 19 DL MOUSE inet 19 IALL SUPPO SUCRES nn ee an N nn 19 gt 12 AP200 ENCIS UC nioa da means 19 3
13. for example two batteries or a battery and an AC DC power adapter 1313 E J1 _llimi 1 1 lm 131 311133 z Mi AP200 CO H O Atmospheric Profile System is CAMPBELL SCIENTIFIC Made in USA FIGURE 5 16 Proper wiring of power cable onto DIN bus of AP200 system enclosure To relieve strain on the AP200 cables use a cable tie to secure the cables to the cable tie loop on the pump module as shown in FIGURE 5 17 FIGURE 5 17 Power cables secured to cable tie loop on pump module of AP200 enclosure 31 AP200 CO H 0 Atmospheric Profile System 32 NOTE Replace the cap on the AP200 enclosure feedthrough Gently bend the cables back as you slide the cap on and rotate the cap to minimize the space around the cables as shown in FIGURE 5 18 Tighten the thumbscrew to secure it This will relieve further strain on the cable and also minimize air infiltration to extend the life of the enclosure desiccant packs FIGURE 5 18 Cut away view showing proper replacement of feedthrough cap In very humid conditions t may be helpful to seal the cable feedthrough with plumber s putty The AP200 stores energy in a capacitor to provide backup power in the event power 1s interrupted The capacitor will power the datalogger for a few seconds allowing it to finish writing data to the CF card and close the file to prevent loss of data or damage to the CF card Do not attach additional sensors or other devices that are power
14. in Swagelok 3 one in and up to two out 2 8 mm to 6 6 mm 0 11 in to 0 26 in 26 to 12 AWG 5 0 mm 0 2 in 0 4 Newton meter Nem 5 Installation 9 1 Mounting AP200 CO H 0 Atmospheric Profile System The following tools are required to install the AP200 system in the field Additional tools may be required for a user supplied tripod or tower 9 16 1n open end wrench Adjustable wrench Tubing cutter included with AP200 Small flat tip screwdriver included with AP200 Wire stripping tool 5 1 1 Support Structure The AP200 system has two types of components that must be mounted to a support structure the intake assemblies and the AP200 system enclosure The support structure itself is not included in the AP200 so that 1t can be tailored to specific needs but several options are available Contact a Campbell Scientific application engineer for more information on site specific mounting options The following installation notes show a typical application using a UT30 tower The AP200 intake assemblies are designed to mount on a vertical pipe of 1 3 cm to 5 0 cm 0 5 in to 2 0 1n diameter They should be mounted at the positions where the air 1s to be sampled The AP200 system enclosure should be mounted where it can be accessed easily to retrieve data from the CF cards on the datalogger The AP200 can be configured with one of these mounting options similar to the standard ENC16 18 enclosure Triangular tower
15. is complete Td_ambient will again be displayed Verify that the value is close to the value of H2OSpanDewPt To avoid pulling unfiltered air into the AP200 do not shut down or disconnect the dew point generator until the valve sequence has been restarted as described in Section 6 2 5 Restart the Sequence Press lt Esc gt to return to the Manual Zero Span menu 43 AP200 CO H 0 Atmospheric Profile System T 44 6 2 5 Restart the Sequence At the conclusion of the manual zero span process you will need to restart the automatic valve sequence Go to the last line of the Manual Zero Span menu and set STARTsequence True Verify valve number changes to 1 and look at the LEDs on the valve module to confirm that valve 1 s active The AP200 will stay on valve 1 until it is synchronized with the real time clock Then it will set seq ACTIVE to True and begin the valve sequence See Section 5 5 Starting and Stopping the Sequence for more details on starting the sequence Once the valve_number changes to 1 you may shut down and disconnect the dew point generator Replace the plug on the AP200 H2O Span inlet Press lt Esc gt to return to the AP200 menu 6 2 6 Check the System When the manual zero span process is complete and the valve sequence is restarted select Check Status from the main AP200 menu and verify proper operation of the system as described in Section 5 6 1 Ouick Status Check Using a Keyboard Display M
16. less than the 80 s required for a zero span check so two profile cycles must be replaced This gives a total of 120 s the same as the scenario with eight levels TABLE D 3 Timing for Zero Span Sequence check only Number Profile Cycle Span Zero Equilibration Total Zero Span of Levels Time s Time s Time s Time s Time s S milar to the profile sequence the cal bration sequence timing parameters are implemented as a set of three arrays CalSequence CalOnCounts and CalOmitCounts These arrays are not accessible in the Public table but they are output to the Timelnfo table as a record of the system configuration See Appendix G Output Tables for details on this table Each zero span sequence adds two records to the SiteAvg and CalAvg output tables one for CO Span and one for Zero With Zero and Span If the AP200 is configured with MEASURE TANKS True and AUTO _ZEROSPAN True it will check the zero and CO span command the IRGA to set them and then verify the new readings This section gives timing details for this case The AP200 zero span sequence will e Select inlet 10 CO Span omit at least 20 s for equilibration and include 10 s in the average e Select inlet 9 Zero omit at least 30 s for equilibration and include 10 s in the average Stay on inlet 9 Zero and set the CO zero 10 s Stay on inlet 9 Zero and set the H O zero 10 s Stay on inlet 9 Zero and average for 10 s
17. off waiting for the pressure to stabilize at ambient pressure and then using the pressure measured in the analyzer see Section 6 2 4 Do H2O Span for details PUMP P SETPT This is the setpoint pressure kPa for the pump speed control algorithm The AP200 will adjust the pumping speed to make the measured pump pressure pump_press match this value For most applications it should be set to approximately 35 kPa below ambient pressure see notes on variable PRESS_AMBIENT above The factory default is 200 which will prevent the AP200 from working properly until PUMP_P SETPT is set by the user 33 AP200 CO H 0 Atmospheric Profile System 34 LEVELS USED This is the number of profile levels air sample intakes to be sampled It must be an integer from four to eight If fewer than eight inlets are used they should be connected to the lowest number inlets starting with one The default s eight The next five variables configure the automatic calibration zero span sequence See Section 6 Infrared Gas Analyzer IRGA Zero and Span for details MEASURE_TANKS This Boolean variable determines whether the AP200 will periodically switch between the profile sequence and the calibration zero span sequence Set this variable to True to periodically switch to the zero and CO span tanks Set 1t to False to disable this feature The default 1s MEASURE_TANKS True AUTO ZEROSPAN This Boolean variable determines whether the AP200
18. the supply voltage drops too low the AP200 automatically powers down as much of the system as possible The AP200 requires 10 0 Vdc to 16 0 Vdc at the input terminals Note that the voltage measured in the datalogger batt_volt will be approximately 0 3 V lower than the input voltage due to a reverse polarity protection diode BATT_LOWLIMIT If the supply voltage batt_volt falls below this value the AP200 will set the batt volt LOW flag and shut down as much of the system as possible until the voltage recovers BATT_LOWLIMIT must be 9 7 V to 15 V The default value for BATT_LOWLIMT is 9 7 V which corresponds to 10 0 V at the input terminal This power down feature is to protect the battery from deep discharge cycles The user should set AP200 CO H 0 Atmospheric Profile System BATT_LOWLIMIT as appropriate to protect his battery If AC main power and an AC DC adapter are used the limit may be left at 9 7 V BATT_DEADBAND This variable along with BATT_LOWLIMIT determine when the AP200 will restart after an automatic power shutdown The AP200 will not restart until the supply voltage batt_volt reaches at least BATT_LOWLIMIT BATT_DEADBAND The purpose of the deadband function the gap between the shut down voltage and the turn on voltage 1s to protect the AP200 from repeated power cycles when the battery voltage 1s very near the limit BATT_DEADBAND must be zero to 10 0 V The default is 1 0 V 5 4 2 Compile Switches The AP200 program
19. the user may change the value of valve_ number to control the valves manually 5 6 Verify Performance After the AP200 is installed it is important to make sure it is operating properly 5 6 1 Quick Status Check Using a Keyboard Display The optional hard mounted keyboard display or a hand held CR1000KD provides an easy user interface to the AP200 See Appendix H Keyboard Display Menu for a listing of the AP200 keyboard display menus See the CR1000KD User Manual for operating instructions Press a key to activate the display and select the Check Status page Check Status diag AP200 CO2 H2O seq ACTIVE valve number sample flow cell press This menu page gives a quick look at the following public variables diag_AP200 this should be zero If not see Appendix E AP200 Diagnostics CO2 this is the CO concentration given in ppm Verify that this is a reasonable value H2O this is the H20 concentration given in ppt Verify that this is a reasonable value seq ACTIVE this should be True If not see Section 5 5 Starting and Stopping the Sequence valve_number this is normally an integer from 1 to 8 indicating which profile level is being sampled If the sequence is active this number should AP200 CO H 0 Atmospheric Profile System increment approximately every 15 s see Appendix D Valve Sequence Timing for details It may be 9 Zero or 10 CO Span 1f the zero span sequence is running The corresponding LE
20. to the Timelnfo table as a record of the system configuration See Appendix F Public Variables for details on this table As the AP200 program steps through the profile sequence variable sequence index cycles from 1 to LEVELS USED to access the values stored in the corresponding location in these arrays Array ProfileSequence contains the valve number for each step in the profile sequence The values in this array increment from to LEVELS USED If the intake assemblies are installed according to normal convention the highest intake will be designated level 1 and will connect to inlet 1 on the AP200 system enclosure This gives a one to one correspondence between public variables valve number and sequence index as well as the terms level and step The intake assembly at the top of the tower level 1 connects to inlet 1 on the AP200 system enclosure which 1s controlled by valve number 1 This valve is selected during step one of the profile sequence defined by seq_index 1 Array locations beyond LEVELS USED are filled with zero Array Profile OnCounts contains the time number of scans for each step in the profile sequence This 1s similar to the Time on Level given in TABLE D 1 except it is multiplied by two to account for the datalogger scan rate 2 scans s For most cases the same value is used for each step in the sequence However for seven levels one extra second is allocated for level 1 to achieve an integer number of
21. valve switching sequence A record is stored whenever the profile sequence starts when the program first starts up and when the sequence 1s manually stopped and restarted This table can generally be ignored but 1t provides useful historical information about the valve sequence timing It may be helpful for troubleshooting sequence timing issues G 9 Appendix G Output Tables The first values stored are the system configuration variables that control the sequence timing LEVELS USED MEASURE TANKS AUTO _ZEROSPAN CAL_INTERVAL and CAL TIMEOFFSET The next value sync_interval is calculated by the program It is the duration of the valve sequence in seconds This value 1s used by the program to synchronize the valve sequence to the real time clock For example 1f sync_interval is 90 s the sequence will start at the top of the hour or 1 30 later or 3 00 later etc The rest of the Timelnfo contains the arrays of timing parameters Each array holds eight values where the index corresponds to the index in the sequence If LEVELS USED s less than 8 zero 1s stored for the parameters that are not used ProfileSequence the valve number for this step in the profile sequence This will simply increment from 1 to LEVELS USED Profile OnCounts the time number of scans to spend at this step typically 30 counts 15 s Profile OmitCounts the time number of scans to wait after a valve switch before including data in the averages
22. valve sequence are edited the sequence must be stopped and restarted before changes will be in effect The following public variables allow the user to start and stop the sequence and to control the valves manually seq ACTIVE Reports whether the AP200 is controlling the valves True or not False If seq ACTIVE False the valves can be controlled manually This variable is for information only its value cannot be directly changed by the user STARTsequence Allows the user to start the sequence Set this variable to True to start the automatic valve switching sequence The AP200 will change valve_number to and wait until it can synchronize the valve sequence to the real time clock This may take up to two min see Appendix D Valve 35 AP200 CO H20 Atmospheric Profile System 36 Sequence Timing for timing details When the sequence is restarted the AP200 will set seq ACTIVE True and STARTsequence False STOPsequence Allows the user to stop the sequence Set this variable to True to stop the automatic valve switching sequence The AP200 will immediately set seq ACTIVE False and leave the valve number in its current state valve number Controls which valve 1s selected It may be 1 through 8 profile inlets 9 zero 10 CO Span or 11 H O Span If the sequence is active seq ACTIVE True the AP200 controls the state of valve number and the user may not change it If the sequence is stopped seq ACTIVE False
23. vapor pressure in the sample cell the factor 0 1 converts the vapor pressure from mb to kPa J is the enhancement factor T cel 10P jis the dew point temperature in the sample cell 1s the ambient pressure converted from kPa to mb Compensate for the reduced pressure in the sample cell e e Es amb cell P cell mp 18 the ambient vapor pressure where P cell is the pressure in the sample cell Appendix I Useful Equations Calculate the ambient dew point temperature 240 97z a Buck eq 7a 17 502 z z In Oean Buck eq 7b 6 1121 f where T ae is the ambient dew point temperature Z 1S an intermediate result In is the natural logarithm Campbell Scientific Companies Campbell Scientific Inc CSI 815 West 1800 North Logan Utah 84321 UNITED STATES www campbellsci com info campbellsci com Campbell Scientific Africa Pty Ltd CSAf PO Box 2450 Somerset West 7129 SOUTH AFRICA www csafrica co za cleroux O csafrica co za Campbell Scientific Australia Pty Ltd CSA PO Box 8108 Garbutt Post Shop QLD 4814 AUSTRALIA www campbellsci com au info campbellsci com au Campbell Scientific do Brazil Ltda CSB Rua Luisa Crapsi Orsi 15 Butanta CEP 005543 000 Sao Paulo SP BRAZIL www campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta TSM 1W7 CANADA www campbellsci ca dataloggers campbellsci ca
24. 0 seq ACTIVE STOPsequence valve_number diag AP200 Do CO2 Span seq ACTIVE STOPsequence CO2 SPAN_PPM valve number diag AP200 CO2 DO CO2 span Appendix H Keyboard Display Menu Do H20 Span seq ACTIVE STOPsequence cell press pump_ON H20SpanDewPt PRESS_AMBIEN SETpressAmbi Td_cell Td_ambient cell press pump_ON SpanCellP SETspanCellP valve_number diag AP200 Td ambient DO H20 span Configure System PRESS AMBIEN PUMP_P_SETPT LEVELS USED MEASURE_TANK AUTO_ZEROSPA CAL_INTERVAL CAL_TIMEOFFS CO2 SPAN PPM BATT LOWLIMI BATT DEADBAN Appendix H Keyboard Display Menu Appendix I Useful Equations Dew Point Temperature Calculations The IRGA reports the dew point temperature public variable Td_cell but this represents the conditions in the sample cell The AP200 converts this to dew point temperature in the ambient air Td_ambient This conversion is a three step process 1 calculate vapor pressure in the sample cell 2 compensate for the pressure difference between the ambient and the sample cell and 3 calculate ambient dew point temperature from ambient vapor pressure The equations are adapted from Buck A L 1981 New equations for computing vapor pressure and enhancement factor Journal of Applied Meteorology 20 1527 1532 Calculate vapor pressure from dew point temperature 17 5027 y e y 0 1 f 6 1121e e Buck eq 8 f 1 0007 3 46x10 10P Buck eq 7c where 18 the
25. 200 will store the value of cell_press in PRESS AMBIENT Verify that the value in PRESS AMBIENT now matches cell_press The next two variables are Td_cell and Td_ambient Td_cell is the dew point temperature measured by the IRGA Td_ambient is corrected for the difference in pressure between that of the sample cell and ambient see Appendix I Useful Equations With the pump off these two dew point temperatures should match Step down to pump_ON and set it to True to turn the pump on You should hear the pump start to run at full speed and then slow down to stabilize the pump pressure to ts setpoint While the pump is on and the IRGA sample cell s stable at ts normal operating pressure set SETspanCellP True The AP200 will store the value of cell_press in SpanCellP Verify that the value in SpanCellP now matches that of cell_press Set valve number to H2Ospan 11 Look at the LEDs on the valve module to confirm the H20 span valve is now active Check the value of diag AP200 If it is not zero a problem in the AP200 system should be resolved before continuing see Appendix E AP200 Diagnostics Wait for the value of Td ambient to stabilize This normally takes one to two minutes Set DO H20 span to True The AP200 will send the command to the IRGA to do an H O span While the IRGA is setting the span the value for Td_ambient will not be available and NAN will be displayed This will take approximately 10 s When the process
26. AVOANVIAN NOLLDIALSNI AP200 COy H 0 Atmospheric Profile System 8 12 Copyright 2012 Campbell Scientific Inc Warranty PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC INC are warranted by Campbell Scientific Inc Campbell to be free from defects in materials and workmanship under normal use and service for twelve 12 months from date of shipment unless otherwise specified in the corresponding Campbell pricelist or product manual Products not manufactured but that are re sold by Campbell are warranted only to the limits extended by the original manufacturer Batteries fine wire thermocouples desiccant and other consumables have no warranty Campbell s obligation under this warranty 1s limited to repairing or replacing at Campbell s option defective products which shall be the sole and exclusive remedy under this warranty The customer shall assume all costs of removing reinstalling and shipping defective products to Campbell Campbell will return such products by surface carrier prepaid within the continental United States of America To all other locations Campbell will return such products best way CIP Port of Entry INCOTERM 2010 prepaid This warranty shall not apply to any products which have been subjected to modification misuse neglect improper service accidents of nature or shipping damage This warranty is in lieu of all other warranties expressed or implied The warranty for installation service
27. D on the valve module should be ON sample flow The expected value for the sample flow depends on the elevation see FIGURE 4 16 and FIGURE 4 17 for details A significantly higher flow indicates there may be a leak whereas a significantly lower flow indicates the filter or orifice may be plugged cell press This should be within 2 kPa of the pressure setpoint See Section 4 2 3 Pump Module for details To access other tables in the CR1000 press lt ESC gt to go back to the top menu and then select System Menu This gives access to all of the system tables In particular the status table 1s helpful for assessing the status of the CR1000 datalogger see the CR1000 User Manual for details and the public table shows the value of each public variable as 1t updates in real time See Appendix F Public Variables for details on the variables in the Public Table 5 6 2 Checking Status Remotely If the system is configured with an NL115 and a network connection is available the AP200 can be checked remotely by connecting a PC via LoggerNet other software 1s also available that provides some of the functionality of LoggerNet see Section 4 1 5 Support Software LoggerNet may also be used on site with a serial cable connected directly to the datalogger All of the variables listed in the on site access can be checked in the Public table For thorough performance verification each of the variables in the public table can be compared to
28. E G 1 Variables of the IntAvg Table ne When Used in When Included in CI entoni ms EU ra emaom ass PL sample pow mm Ave enomit ms To Numsunpte TT ana Tonm e aw maom ana same tow min Ave eao ana RER UE TT ana Bonm e ae T3 sample tow mimin Ave RER Ta Taon e ave Ta sample tow min Ave re A LS Namsos smo p aw momi maters gt 4 CAT TT is Numsanpte Ta emaom Martens v8 Avg Tot v8 v8 Avg v8 Avg Tot v8 v8 Avg v8 Avg Tot v8 v8 Avg v8 Avg Tot v8 v8 Avg Appendix G Output Tables TABLE G 1 Variables of the IntAvg Table RN When Used in When Included in m CAT YE P pp u pumpe Ave ave Y an Pumpen at as Fun Ta t C a m a Z C air AD G 3 Appendix G Output Tables TABLE G 1 Variables of the IntAvg Table When Used in When Included in Calculation Table T air Avg 3 Avg all N_AirTemps gt 2 T air Avg 4 Avg all N_AirTemps gt 3 Name Units Statistic T air Avg 5 Avg all T air Avg 6 Avg all T air Avg 7 Avg all T air Avg 8 Avg all CalAvg The CalA vg table contains data from the automated zero span sequences Records are written to this table when the calibration sequence is run as determined by CAL_INTERVAL If MEASURE TANKS False the AP200 will not write to this table Each calibration sequence will put multiple records in the CalAvg table If AUTO_ZEROSPAN False eac
29. N_AirTemps gt 1 air temperature profile optional defined only 1f N AirTemps gt 2 air temperature profile optional defined only if N_AirTemps gt 3 Usage TAIR TAIR TAIR TAIR USER USER USER USER INFO USER INFO USER INFO USER CONFIG CONFIG CONFIG CONFIG CONFIG CONFIG CONFIG CONFIG CONFIG CONFIG Variable Name SpanCellP DO zero DO CO2 span DO H20 span PRESS AMBIENT PUMP P SETPT LEVELS USED MEASURE TANKS AUTO ZEROSPAN CAL INTERVAL CAL TIMEOFFSET CO2 SPAN PPM BATT LOWLIMIT BATT DEADBAND gt D TD D Q x TN D lt S S gt 3 Q D Y TABLE F 1 Public Variables _ BE Description air temperature profile optional defined only if N_AirTemps gt 4 air temperature profile optional defined only if N_AirTemps gt 5 air temperature profile optional defined only 1f N_AirTemps gt 6 air temperature profile optional defined only 1f N_AirTemps gt 7 setpoint temperature on dew point generator used for H O span set to True for AP200 to store the value of cell press in PressAmbient Set True for AP200 to store the value of cell_press n SpanCellP sample cell operating pressure used for H O span set to True for AP200 to send CO amp H 0 zero commands to the IRGA set to True for AP200 to send CO span command to the IRGA Set True for AP200 to send H O span command to the IRGA ambient p
30. Select inlet 10 CO Span equilibrate for 30 s and average 10 s Stay on inlet 10 CO Span and set the CO span 10 s Stay on inlet 10 CO Span and average for 10 s Appendix D Valve Sequence Timing e Select inlet 1 to allow at least 10 s extra equilibration time This allows the humidity in the tubing and IRGA to equilibrate before restarting the profile sequence As shown in TABLE D 4 this minimum timing adds up to 170 s for the zero span sequence The timing parameters are adjusted as needed to equal a multiple of the profile sequence cycle time For example if there are 8 levels used the profile cycle time is 120 s Because this is less than the 170 s required it s doubled to 240 s Extra equilibration time is added to each step to make the zero span sequence equal 240 s If there are four levels used the profile cycle time 1s only 60 s Three profile cycles times are used to give 180 s for the zero span sequence TABLE D 4 Timing for Zero Span Sequence setting the IRGA Number Profile Measure Measure Measure Equilibration Zero Span of Levels Cycle CO Span amp Set Zero amp Set CO Span Time s Time s Time s Time s Time s Time s Each time the zero span sequence is run five records will be added to the SiteAvg and CalA vg tables CO Span tank before setting zero or span Zero tank before setting zero or span Zero tank after setting zero CO Span tank after setting zero CO Span tank after s
31. UT10 UT20 or UT30 Tripod mast 1 5 in to 1 9 in diameter Tripod leg CM106 or CM106K tripod only Large pole 4 0 n to 10 0 in diameter No mounting bracket Consult the ENC10 12 ENC12 14 ENC14 16 ENC16 18 Instruction Manual available at www campbellsci com for details on mounting bracket options 5 1 2 AP200 Enclosure Mount the AP200 system enclosure where it can be accessed easily to retrieve data from the CF cards on the datalogger The AP200 system enclosure is similar to the ENC16 18 enclosure and it has the same mounting options available Consult the ENC10 12 ENC12 14 ENC14 16 ENC16 18 Instruction Manual available at www campbellsci com for mounting details Typical installation of an AP200 system enclosure on a UT30 tower 1s shown in FIGURE 5 1 19 AP200 CO H 0 Atmospheric Profile System 20 FIGURE 5 1 Installation showing mounting hardware of AP200 system enclosure on UT30 tower Open the sealed bag containing the desiccant packs and humidity card Place two of the desiccant packs and the humidity indicator card in the mesh pocket in the enclosure door to desiccate the inside of the enclosure Reseal the remaining two desiccant packs in the bag to use later Intake Assemblies Mount the intake assemblies on a vertical pipe of 1 3 cm 0 5 in to 5 0 cm 2 0 in diameter at the air sampling positions Loosen the wing nuts to avoid the risk of dropping the wing nuts do not remove them completely Plac
32. ables Some of the variables in the AP200 s CRBasic program are included in the Public table These public variables may be displayed or edited with a keyboard display or PC Other program variables are hidden from the user to reduce clutter n the Public table Many of these public variables are saved in the output tables Some of the public variables allow the user to set the operation of the system or to give diagnostic information The intended usage of the public variables is categorized as follows IRGA measured directly by the IRGA TAIR air temperature defined only if N_AirTemps gt 0 DIAG diagnostic USER user setting INFO provides information on system status INFO USER conditional user setting may set 1f the sequence 1s stopped CONFIG system configuration parameter saved in file sys conf var dat The public variables are listed in TABLE F 1 TABLE F 1 Public Variables em TimeStamp date and time the record was measured AP200 diagnostic word nonzero value indicates a mu ee problemde ceed number of scans since the start of this output interval half hour Poser fsrarneqens set 1o True to sare ama valve eno BE USER STOPsequence set to True to stop the automatic valve sequence F 1 Appendix F Public Variables TABLE F 1 Public Variables Usage Variable Name Units seq ACTIVE Description IN INFO USER Boolean flag True if the valve sequence is active valve number sequ
33. aintenance and Troubleshooting 7 1 Most of the basic diagnostic and troubleshooting issues for the AP200 are covered in Appendix E 4P200 Diagnostics This section provides additional detail on some issues Plumbing Leaks Most of the AP200 plumbing operates at reduced pressure If there is a leak ambient air will be pulled into the air stream mixing with the intended air sample and changing the concentration of CO and H O A large leak can be easily identified by the higher than normal flow rate but a small leak may be difficult to detect One technique that may be helpful to check for leaks 1s to breathe on a suspect fitting while observing the measured CO concentration Because exhaled breath contains much higher CO than ambient air breathing on the location of a leak will cause a rise in measured CO If you are near the sample inlet take care that your breath does not reach the inlet directly There may be a substantial time delay when checking for leaks at the intake assembly The mixing volume can cause the delay and smooth the response A long intake tube will also introduce a significant time delay Some common causes of leaks include e Forgetting to tighten a fitting during the installation It is good practice to check all of the tube connections before you turn the system on If you can loosen a fitting with your fingers 1t was not tightened properly e Dirt or debris in the tube fitting Use care when connecting or di
34. as you cut it 4 Push an insert into the end of the tubing 5 Do not remove the nuts and ferrules from the fitting Simply insert the tube into the assembled fitting until it bottoms out 6 Rotate the nut finger tight 7 While holding the fitting body steady tighten the nut one and one quarter turns For 1 16 in or 1 8 n sized fittings tighten the nut three quarters turn First time assembly metal tubing Extra care is needed to avoid over tightening brass fittings when used with metal tubing These notes apply to reducers and port connectors as well as metal tubing No insert is required with metal tubing B 1 Appendix B Using Swagelok Fittings B 2 Common Replacement Parts 1 Do not remove the nuts and ferrules from the fitting Simply insert the tube into the assembled fitting until it bottoms out 2 Rotate the nut until it is finger tight 3 While holding the fitting body steady tighten the nut until it feels tight Normally this will be less than one full turn Tightening a full one and one quarter turns will damage the threads on the fitting and nut Reassembly plastic or metal tubing You may disassemble and reassemble Swagelok tube fittings many times but the assembly process is slightly different than the first assembly 1 Insert the tube with pre swaged ferrules into the fitting until the front ferrule seats against the fitting body 2 Rotate the nut until it is finger tight 3 While ho
35. ately See the Model 107 Temperature Probe Instruction Manual available from Campbell Scientific www campbellscientific com for details The following section gives brief instructions for using these temperature probes with the AP200 system Mounting See the 107 manual for more detail on installing the temperature probes Normally the probes will be mounted at the same heights as the air sample intake assemblies See Section 4 1 4 Other Accessories for more detailed discussion of the 107 L temperature probe and its associated radiation shield The assembled probe and shield are shown in FIGURE C 1 FIGURE C 1 107 L temperature probe mounted with radiation shield Wiring The 107 temperature probes should be wired to consecutive single ended channels starting at SEl Any number of probes may be used All temperature probes should use the VX1 excitation terminal Configuring the CRBasic program The AP200 program has a constant N_AirTemps that 1s used as a compile switch to tell the program how many 107 L temperature probes are used Set this constant to zero the default to disable reading temperature probes or to a number from 1 to 8 that indicates the number of probes to be measured Example 1 temperature probes disabled Const N_AirTemps 0 number of 107 L temperature sensors to measure may be 1 to 8 or zero to disable air temperature measurements C 1 Appendix C Temperature Profile Example 2 measure eight te
36. ble in the AP200 system enclosure Campbell Scientific pn 9922 cable or equivalent is recommended for connecting the intake assemblies to the system enclosure The system is designed to daisy chain the heater cables from one intake assembly to the next as described below and shown in FIGURE 5 15 Make sure power is disconnected from the AP200 before connecting the heater cable To bring cables into the AP200 enclosure remove the cap from the cable feedthrough by loosening the thumbscrew and twisting the cap as you pull it off AP200 CO H 0 Atmospheric Profile System FIGURE 5 10 Cable feedthrough cap shown removed to admit cables into the system enclosure Insert the heater cable through the feedthrough and connect it to the DIN rail bus in the system enclosure The red positive wire connects to one of the terminals labeled Intake Heater Connect the black negative wire to one of the terminals labeled G Two connections are provided for convenience 1f multiple cables are to be connected for example if the intake assemblies are mounted on two separate towers ys 242 ME DAI EPEPI 1 lm 131 3111233 CO H O Atmospheric Profile System CAMPBELL SCIENTIFIC Made in USA FIGURE 5 11 Proper wiring of heater cable onto DIN bus of AP200 system enclosure 27 AP200 CO H 0 Atmospheric Profile System NOTE To connect a wire to the DIN rail terminal blocks of the AP200 enclosure insert a small screwdriver into the sq
37. cycles per half hour Array locations beyond LEVELS USED are filled with zero Profile OmitCounts is the time number of scans to wait after a valve switch before including data in the average This 1s the Omitted Time given in TABLE D 1 multiplied by two to account for the datalogger scan rate 2 scans s For most cases the same value is used for each step in the sequence For seven levels an extra second is allocated for level 1 to achieve an integer number of cycles per half hour Array locations beyond LEVELS USED are filled with zero Synchronization to the Real time Clock When the AP200 program starts or when the user restarts the sequence see Section 5 5 Stopping and Starting the Sequence the AP200 will delay the actual profile sequence start by up to two minutes to synchronize the sequence to the datalogger real time clock The following examples illustrate this synchronization Example 1 LEVELS USED 8 STARTsequence set to True at 9 15 25 As shown in TABLE D 1 the cycle time for 8 levels is 120 s 2 min To synchronize with the real time clock the sequence must start at a multiple of 2 min for example 9 00 00 9 02 00 9 04 00 etc Valve 1 will be selected as soon as STARTsequence is set True 9 15 25 but the sequence will not actually start until 9 16 00 the earliest multiple of 2 min Data will be included in the average for level 1 from 9 16 10 to 9 16 15 when the valve will switch to level 2 Data wil
38. d Other modifications to the AP200 program for example to measure additional sensors are not recommended without first consulting a Campbell Scientific application engineer 5 4 1 System Configuration Variables Several special variables are used to configure the AP200 These variables are stored in the sys conf var dat file so their values will be saved and recalled if the program is recompiled They are intended to be set when a new system is installed but they may be edited at any time When a system configuration variable is changed the AP200 will write a message to the message log table and save the new values in sys conf var dat This section gives a brief description of each of these variables and refers the reader to the appropriate section of the user manual if a lengthy discussion is required PRESS AMBIENT This is the ambient pressure in kPa It depends primarily on elevation see FIGURE 4 16 but also var es slightly with barometric pressure This variable is used to convert the dew point temperature measured in the analyzer sample cell Td_ cell to dew point temperature at ambient pressure Td ambient It is also used during a manual H20 span operation There are three methods to determine the appropriate value for PRESS_AMBIENT e If nominal ambient pressure is known simply enter the value e If elevation is known determine ambient pressure from FIGURE 4 16 e Ambient pressure can be measured by turning the AP200 pump
39. d red black pair of wire gauge AWG 20 within a rugged Santoprene jacket System Power Cable The AP200 requires a cable to connect it to the user s battery or other power source The same cable may be used for the system power as for the heaters pn 9922 1f the length 1s short less than 3 m or 10 ft The AP200 requires a current from 1 0 A to 3 0 A which will cause a voltage drop in the power cable of 0 2 V to 0 6 V for a 10 ft length of pn 9922 cable The corresponding power loss is 0 2 W to 1 8 W For most applications the preferred power cable is CABLEPCBL L This cable consists of a twisted red black pair of wire gauge AWG 16 within a rugged Santoprene jacket It 1s cut to the specified length and the end finished for easy installation The voltage and power losses will be a factor of 2 5 smaller than for the pn 9922 cable Ifthe power cable must be longer than 8 m 25 ft contact Campbell Scientific AP200 AC DC Power Adapter Kit An AC DC Adapter Kit can be configured within the AP200 system enclosure to allow the AP200 to be powered from AC mains power The AC DC Adapter Kit pn 28549 is shown in FIGURE 4 7 and instructions for installing the adapter kit are given in Appendix A AP200 AC DC Adapter Kit AP200 CO H 0 Atmospheric Profile System FIGURE 4 7 AC DC adapter kit installed in the AP200 CF Card The AP200 stores data on a CompactFlash memory card There are two types of CF cards available today Industrial Grade a
40. daisy chained to the AP200 system enclosure The AP200 requires a 10 Vdc to 16 Vdc power source The average power consumption varies with ambient temperature mostly due to the heater in the IRGA that maintains 1ts sample cell at 50 C There are also heaters and fans that will cycle on and off to maintain the temperatures of the pump and the valve manifold The maximum power consumption may briefly be as high as 45 W if the system is started at cold temperatures below 0 C Carefully design any DC power source to ensure uninterrupted power Contact a Campbell Scientific applications engineer for assistance if needed The AP200 can be damaged by pulling unfiltered air into the valve manifold Before applying power to the AP200 make sure each inlet has a filter such as included in the AP200 intake assemblies or is capped To reduce the risk of shorting the power supply this is especially important when using batteries connect the power cable to the AP200 first and then connect the other end to the power source Insert the power cable CABLEPCBL L through the feedthrough and connect 1t to the DIN rail bus in the system enclosure The red positive wire connects to one of the terminals labeled 10 to 16 Vde In Connect the black negative wire to one of the terminals labeled G as shown in FIGURE 5 16 Two connections are provided for convenience 1f multiple power sources are to be AP200 CO H 0 Atmospheric Profile System connected
41. dicator Card The replacement humidity indicator FIGURE 4 13 card 1s pn 28878 HUMIDITY INDICATOR MS20003 2 EXAMINE ITEM IF PINK WWW S CPP COM CHANGE DESICCANT IF PINK WARNING IF PINK Batch 0000113685 S d Chemie Performance Packaging Colton CA DISCARD IF eo OVERRUN AVOID METAL CONTACT FIGURE 4 13 Humidity indicator card 4 2 Theory of Operation The AP200 system measures CO and H 0 concentrations at multiple locations by pulling a continuous sample flow from each of several four to eight intake assemblies Solenoid valves direct sample flow from one intake assembly at a time through a CO H O analyzer A CR1000 datalogger records data selects valves adjusts pumping speed to control system pressure and controls the temperatures of the pump and valve manifold FIGURE 4 14 is a plumbing diagram showing the various parts of the AP200 system connected Details for each part of the system are given in this section AP200 COy H3 O Atmospheric Profile System MIN eee wei aaa y ias H lisas y ser Tees Filter E DA DA DA Jeer plep Iep fo A Sample flow y Vo Mental Bypass flow Buffer volumes Dew point generator o AP200 System Enclosure FIGURE 4 14 Plumbing diagram of AP200 system 11 AP200 CO H 0 Atmospheric Profile System 4 2 1 Intake Assemblies The AP200 intake assembly pn 27693 includes a rain diverter with filter a mixing volume and a heat
42. e If the AP200 system enclosure s mounted low to the ground it may be difficult to read the label on the bottom of the enclosure For convenience the inlet connections are also labeled on the inside of the enclosure as shown in FIGURE 5 5 AP200 CO H 0 Atmospheric Profile System a 1 2 3 4 5 6 7 8 HQ Y Exhaust CO Span H20 Span 7 o FIGURE 5 5 Labeled inlet connections inside enclosure Connect the top intake assembly to inlet 1 on the AP200 system enclosure the next highest intake assembly to inlet 2 and so forth Connecting the tubes in this order longest to shortest will minimize the time skew between intake assemblies If using fewer than eight intake assemblies four to eight are allowed they must be connected to the AP200 system enclosure inlets in order starting with 1 Plug unused inlets using Swagelok plugs pn 15891 included with the AP200 FIGURE 5 6 shows the tubing connections from the intake assemblies to the system enclosure EAD SAT SOLS EE A LE e Sats Ft aD FIGURE 5 6 Tubing connections from four intake assemblies connected to inlets 1 4 23 AP200 CO H 0 Atmospheric Profile System 24 5 2 2 Zero and CO Span NOTE The AP200 can perform automated zero CO and HO and CO span of the IRGA This requires the user to supply cylinders of zero air and CO span gas with appropriate regulators Install these cylinders in close proximity to the AP200 system e
43. e AP200 measures atmospheric carbon dioxide and water vapor at up to eight positions vertically Intake assemblies are generally spaced along the height of a tower to enable measurement of the vertical profile The AP200 is commonly used in conjunction with an eddy covariance system to measure the storage term to give a more complete measurement of the surface exchange 4 1 System Components The AP200 consists of several components some of which are optional Some additional accessories are required to complete a fully functioning AP200 system and are described and illustrated in the sections that follow 4 1 1 Standard Components Standard with the AP200 are the AP200 system enclosure and four to eight intake assemblies The AP200 system enclosure always includes a sample pump valve manifold CR1000 datalogger and other electronics to control and monitor the system The components within the AP200 are shown in FIGURE 4 1 The CR1000 records data selects valves adjusts pumping speed to control system pressure and controls the temperatures of the pump and valve manifold AP200 COy H3 O Atmospheric Profile System FIGURE 4 1 Interior of AP200 system enclosure The AP200 intake assembly pn 27693 includes a filter to remove particulates and an orifice to set the flow rate The closed intake assembly 1s shown in FIGURE 4 2 The orifice 1s heated to prevent condensation The intake assembly includes a mixing volume to dampen fluctuatio
44. e Assemblies for details If the flow goes too high at a valve switch but comes into the normal range within a few seconds this is normal It s caused by a different pressure drop through the valve manifold depending on whether the inlet is selected or bypassed The combined flow from the bypassed inlets causes slightly more pressure drop than for the inlet selected to go to the IRGA Consequently the pressure in the intake tubes and mixing volumes increases slightly when they are bypassed When a bypassed inlet is selected the pressure equalizes by pushing slightly higher flow than normal through the IRGA This is acceptable as long as the sample flow is within the normal range by the time the data are included in the average If the flow for one or more of the inlets stabilizes at a high flow this may indicate a leak in a tube or connection See Section 7 1 Plumbing Leaks for leak checking suggestions If the flow is too low for one or more inlets this 1s most likely caused by a filter that 1s plugged with particulates This normally happens over a span of weeks or months It may happen more quickly in dirty conditions Try replacing the filter see Section 7 3 Intake Filters If this does not resolve the problem the orifice may be plugged and Campbell Scientific should be contacted E 5 Appendix E AP200 Diagnostics E 6 Zero Span Inlets The sample flow for zero span inlets is set by restriction in the small stainless
45. e the assembly against the vertical support swing the bracket around the back of the vertical support slide the bolt into the slot and hand tighten the wing nuts A typical installation of an AP200 intake assembly on a UT30 tower is shown in FIGURE 5 2 AP200 CO H 0 Atmospheric Profile System FIGURE 5 2 Installation of AP200 intake assembly on a UT30 tower The inlet to the intake assembly incorporates a rain diverter with a sintered stainless steel a r filter disk as shown in FIGURE 5 3 As the rain diverter may have rotated during shipping or handling rotate the rain diverter as needed to orient the opening downward to divert rain away from the filter element FIGURE 5 3 Rain diverter from an AP200 intake assembly 21 AP200 CO H20 Atmospheric Profile System 22 5 2 Plumbing 5 2 1 Profile Sample Tubes NOTE A sample tube must be used to bring the air sample from each intake assembly to the AP200 system enclosure Campbell Scientific pn 15702 or equivalent is recommended This tubing has an aluminum layer to minimize diffusion through the wall of the tube See Appendix B Using Swagelok Fittings for important information The AP200 has eleven inlets labeled 1 through 8 Zero CO Span and H O Span and one outlet labeled Exhaust All connections are 0 25 in Swagelok fittings mounted on the bottom of the enclosure as shown in FIGURE 5 4 A FIGURE 5 4 Tubing connections on bottom of AP200 enclosur
46. ection 5 4 Configure the Program for more details MEASURE_TANKS Set this variable to True to periodically switch to the zero and CO span tanks AUTO ZEROSPAN This variable can be set to either True or False True will command the IRGA to perform the zero and span False will command the IRGA to measure the tanks but not perform the zero and span The recommended default is to set this variable to True CAL INTERVAL This variable determines how often the cal zero span tanks are measured The recommended default s 1 440 min once per day CAL TIMEOFFSET This variable determines when the zero span is performed within the CAL INTERVAL time The recommended default 1s 720 min to start the calibration sequence at noon CO2 SPAN PPM Enter the concentration of the CO span tank in ppm AP200 CO H 0 Atmospheric Profile System After these variables are set the valve sequence must be restarted to make the changes effective See Section 5 5 Starting and Stopping the Sequence for detail on starting and stopping the sequence The program will then set 1ts timing variables as appropriate for the options selected see Appendix D Valve Sequence Timing for details 6 2 Manual Zero and Span This section describes how to perform a manual zero and span of the IRGA This procedure assumes the use of a keyboard display but the process 1s similar when using LoggerNet The AP200 keyboard menus are designed to guide the user step by step
47. ed from the datalogger without consulting a Campbell Scientific application engineer 5 4 Configure the Program The AP200 is shipped with the program AP200 vx x crl installed on the CR1000 datalogger A copy of the program is found on the AP200 Support CD pn 28552 or can be downloaded from www campbellsci com The AP200 program uses both constants and variables to customize the behavior of the system for a particular installation Constants are used for parameters that must be determined when the program is compiled and variables are used otherwise AP200 CO H 0 Atmospheric Profile System Constants are most easily modified using the CRBasic Editor which is part of the PC400 and LoggerNet datalogger support software packages They may also be edited with a simple text editor and uploaded to the datalogger using PC200W which may be downloaded from www campbellsci com The AP200 uses some constants as compile switches to define the state of the system during compilation Variables may be edited while the program is running using either a keyboard display or a PC connected through PC200W PC400 or LoggerNet Variables that define the operational configuration of the system are defined as system configuration variables Any changes to these variables are automatically saved in nonvolatile memory NOTE A change to a system configuration variable that affects the valve switching sequence will not take effect until the sequence 1s starte
48. ed orifice on a common mounting bracket with rain cover The filter element pn 27809 is a 2 5 cm 1 0 in diameter sintered stainless steel disk with 10 micron pore size It removes particulates from the air sample that could clog the orifice or valve FIGURE 4 15 AP200 intake assembly shown open The orifice has a diameter of 0 18 mm 0 007 1n to restrict flow to a maximum of approximately 247 standard mlemin at sea level The flow will be reduced at higher elevations due to the lower atmospheric pressure The nominal ambient pressure as a function of elevation 1s shown in FIGURE 4 16 105 100 T E 95 5 90 Y Y 2 85 A 80 5 a 75 70 65 0 500 1000 1500 2000 2500 3000 Elevation m FIGURE 4 16 Nominal ambient pressure as related to increasing elevation 12 AP200 CO H 0 Atmospheric Profile System FIGURE 4 17 shows the nominal sample flow as a function of ambient pressure assuming a 35 kPa pressure drop across the orifice 250 240 230 220 210 Sample Flow ml min 200 190 180 70 15 80 85 90 95 100 Ambient Pressure kPa FIGURE 4 17 Nominal sample flow rate as related to increasing ambient pressure Taken together these two graphs show that the nominal flow varies from 247 ml min at sea level to 180 ml min at 3000 m The flow rate is reported in public variable sample flow Some variation in f
49. eed This is the rotational speed of the pump given in Hz The pumping speed will typically be 25 Hz to 40 Hz The actual value 1s not critical however as long as the pressure can be maintained at the setpoint Pump Temperature The temperature of the pump module is reported in public variable pump _tmpr The operating range of the pump is 0 C to 55 C If the pump temperature is outside this range the AP200 will disable the pump The pump module has a heater 8 W that turns on 1f the pump temperature falls below 2 C If the AP200 is started at cold temperature it may take up to 50 minues to warm the pump module from 30 C to 0 C When it reaches 2 C the heater will cycle on off as needed to maintain this temperature The fraction of time the pump heater is on is reported in the output tables IntAvg CalA vg and SiteAvg as pump heat _ Avg Once the pump is warmed up and starts running 1t will normally keep itself warm without additional heat to approximately 30 C ambient The pump module has a fan 0 7 W that turns on if the pump temperature rises above 50 C The fan will stay on until the pump temperature falls below 45 C The fraction of time the pump fan is on is reported in the output tables IntAvg CalAvg and SiteAvg as pump fan Avg This will typically increase from zero at 20 C ambient temperature to 0 5 0 4 W average power at 45 C The outlet of the pump connects to a small volume to reduce noise and then t
50. ence index DIAG batt volt LOW valve number 1 to 11 determines which inlet 1s selected index for valve switching sequence cycles from 1 to LEVELS USED number of scans since last valve switch Boolean flag True when equilibration time after valve O O O 2 switch is satisfied F INF INF INF temperature of the datalogger wiring panel supply voltage measured inside datalogger after diode voltage drop Boolean flag True if batt volt is too low controls power shutdown temperature of the valve manifold Boolean flag True if the valve module is within operating limits DIAG valve tmpr OK DIAG valve heat ON Boolean flag True if the valve heater is on DIAG valve fan ON USER pump ON Boolean flag True if the valve fan is on set to True to enable the sample pump pressure measured at the pump inlet pump speed control variable can be from 0 off to 1 full aC V AE kPa speed DIAG pump speed Hz aC DIAG pump tmpr OK DIAG pump heat ON DIAG pump fan ON INFO intake heat ON pump speed measured by a tachometer on the pump temperature of the pump Boolean flag True 1f the pump temperature is within its operating range Boolean flag True if the pump heater is on Boolean flag True if the pump fan is on Boolean flag True if the intake heaters are on air temperature profile optional defined only if N_AirTemps gt 0 air temperature profile optional defined only if
51. eric Profile System 14 The intake assembly includes a mixing volume to dampen fluctuations in the CO and H O concentrations Assuming the nominal dependence of pressure and flow on elevation and a 35 kPa pressure drop at the orifice the mixing volume residence time will vary from 2 0 min at sea level to 1 5 min at 3000 m This residence time 1s similar to the time to cycle through all of the intakes 1 to 2 min depending on the number of intakes used This ensures that a transient change in atmospheric CO or H20 concentration will be measured by each of the intakes regardless of when it occurs during the valve switching cycle 4 2 2 Valve Manifold The valve manifold is mounted on the bottom of the AP200 system enclosure It has LEDs to show which valve is active and the state of the heater and fan It has stainless steel tubes that connect the manifold to Swagelok feedthrough fittings on the bottom of the enclosure as shown in FIGURE 4 18 4 S Zero 2 CO Span H20 Span NZ 8 x i Do A Heater Fan CAMPBELL SCIENTIFIC Made in USA 1 Ty _ OSA j A Exhaust CO Span H20 Span 0000009000 o SS o A Zu ve E n FIGURE 4 18 Valve module and Swagelok feedthrough fittings on bottom of AP200 enclosure The valve manifold has eleven inlets eight for air samples and three for zero span and two outlets sample and bypass Each air sample inlet ha
52. ermine the shut down and turn on voltage see Section 5 4 1 System Configuration Variables To confirm the problem verify public variable batt_volt_ LOW True This variable s set to True if the battery voltage falls below the shutoff limit batt_volt lt BATT LOLIMIT Note that batt_volt_ LOW will remain True until the supply voltage reaches the turn on voltage batt_volt gt BATT_ LOLIMIT BATT_DEADBAND The purpose of the deadband the gap between the shut down voltage and the turn on voltage 1s to protect the AP200 from repeated power cycles when the battery voltage 1s very near the shut down limit Note that for troubleshooting purposes if batt volt LOW True and batt_volt is in the deadband you may manually set batt_volt_ LOW False This will let the AP200 power up If this does not work measure the voltage at the AP200 power input terminals and compare this to batt_volt Note that batt_volt is measured in the datalogger which has a diode for reverse voltage protection The actual voltage at the input terminals will be approximately 0 3 volts higher than the value reported by batt_volt The AP200 supply voltage must be 10 0 Vdc to 16 0 Vdc See Section 4 3 2 System Enclosure for details on the power required especially the extra power required for a cold startup Appendix E AP200 Diagnostics Bit 2 Valve temperature is outside its operating range Bit 2 of diag AP200 indicates the valve temperature is outside i
53. etting span D 5 Appendix D Valve Sequence Timing D 6 Appendix E AP200 Diagnostics The public variable diag AP200 indicates conditions outside the normal operating range for the AP200 Any value other than zero indicates a problem Diag AP200 contains several error flags encoded as binary bits To diagnose a problem first decode the value according to TABLE E 1 and then see the corresponding section in this appendix TABLE E 1 Summary of Bit Numbers Indicating Conditions Outside Normal Operating Range Binary Bit LSB 1 Error Condition Battery voltage 1s too low Valve temperature 1s outside 1ts operating range rro sa no pi a SEE Example 1 Assume diag AP200 34 Because 34 32 2 this indicates bit 6 numeric value 32 and bit 2 numeric value 2 are set This means there are two problems e Bit 6 Cell temperature is outside its operating range e Bit 2 Valve temperature is outside its operating range This could arise if the system 1s powered up in cold weather and the valve manifold and IRGA sample cell have not yet reached their operating temperatures Example 2 Assume diag AP200 16 This indicates bit 5 numeric value 16 is set This means the sample flow is outside its normal range of 100 to 300 ml min Output Tables Every sample of diag AP200 is stored in the RawData output table However only an average of diag AP200 is stored in the output tables IntAvg CalAvg and SiteAvg
54. g range of the valves is 4 C to 49 C If the valve temperature is outside this range the AP200 will disable the valves and pump The valve module has a heater 8 W that turns on if the valve temperature falls below 5 C If the AP200 is started at cold temperature it may take up to 20 minutes to warm the valve module from 30 C to 4 C When it reaches 5 C the heater will cycle on off as needed to maintain this temperature The fraction of time the valve heater is on is reported in the output tables IntAvg CalAvg and SiteAvg as valve_heat_Avg This will typically increase from zero at 0 C ambient temperature to 0 5 4 W average power at 30 C The valve module has a fan 0 7 W that turns on if the valve temperature rises above 45 C The fan will stay on until the valve temperature falls below 43 C The fraction of time the valve fan is on is reported in the output tables IntAvg CalAvg and SiteAvg as valve fan Avg This will typically increase from zero at 35 C ambient temperature to 1 0 0 7 W average power at 45 C 4 2 3 Pump Module The AP200 pump module is mounted on the left side of the AP200 system enclosure as shown in FIGURE 4 19 979 FIGURE 4 19 Pump module of AP200 system 15 AP200 CO H 0 Atmospheric Profile System 16 The AP200 pump module pulls air through the system and exhausts it through the Exhaust fitting on the bottom of the system enclosure It uses a small double head diaphragm pump
55. h sequence will place two records in the table e measured values for the CO2 span tank and e zero tank These are distinguished by valve_number 9 Zero Tank and 10 CO Span Tank If AUTO_ZEROSPAN True each sequence will place five records in the table CO span tank zero tank before and after doing the zero and CO span tank before and after doing the CO span Space 1s allocated on the card for 24 000 records 100 days at five records per 30 min The CPU has storage allocated for 240 records 1 day The list of values saved is similar to the list for the IntAvg table Additionally the CalA vg table includes the valve number and standard deviations of several values TABLE G 2 Variables of the CalAvg Table When Used in When Included in Calculation Table Name Units Statistic nn Appendix G Output Tables TABLE G 2 Variables of the CalAvg Table When Included in Name Units Statistic aan eee a Calculation Table em m aa f e ae a n oen prs ave a sie e see an Cu pa Eu un pamp men ave o amp es ave ECU VaneTmproK A Fave mor ae o_ Cane aang Cane fave aise ae CCR man noe as a pmo somsa sa enon awas G 5 Appendix G Output Tables G 6 TABLE G 2 Variables of the CalAvg Table When Used in When Included in Calculation Table T air Avg 2 Avg all N_AirTemps gt 1 T air Avg 3 all N_AirTemps gt 2 Name Units Statistic T air Avg 4 all T
56. inch and connect it to the AP200 power input terminals as shown in FIGURE A 3 The wire with the white stripe goes to the positive input terminal A 1 Appendix A AP200 AC DC Adapter Kit W 10 to 16 Vde In to 16 Vdc In Intake Heater Intake Heater FIGURE A 3 Ends of AC DC cable extension connected to AP200 power input terminal If the AC DC adapter kit was ordered with a detachable power cord remove the AP200 enclosure feedthrough cap insert the end of the power cord and plug it into the AC DC adapter If a long AC power cord is required have a qualified electrician NOTE connect a field wireable plug to the user supplied cord Secure the AC power cord with a wire tie and replace the feedthrough cap as shown in FIGURE A 4 AC power cord secured within AP200 system enclosure FIGURE A 4 A 2 Appendix A AP200 AC DC Adapter Kit Plug the AC power cord into AC mains power 100 Vac to 240 Vac 47 Hz to 63 Hz Plug the AC DC adapter output cable into the cable extension as shown in FIGURE A 5 rofile System USER 33 2 2 CONNECTIONS ER UA SCIENTIFIC x in USA uy yu 1 z m m ja ojo O O lolo Jo Jo Jojojojojojo CO2 amp H20 ce VUVODO pP 55 3 3 655566 3333 TI a E E EJ 070 FIGURE A 5 AC DC adapter output cable plugged into cable extension A 3 Appendix A AP200 AC DC Adapter Kit Appendix B Using Swagelok Fittings B 1 Assembly NOTE This ap
57. irst set of values 1s always stored in RawData The air temperature profile data are stored as determined by constant N_AirTemps The remaining values are stored only if the constant SaveAll diagnostics True This constant may be set to False to reduce the amount of data stored or set to True to allow more detailed analysis of diagnostic values for troubleshooting See Section 5 4 2 Compile Switches for details on setting program constants A 2GB card will store over 50 days without all diagnostics or over 100 days if SaveAll diagnostics False The actual table fill time for the RawData table can be seen in the datalogger status table by either using LoggerNet or with a keyboard display TABLE G 4 Variables of the RawDataTable Calculation 5 O E a A AS 7 m pt C A AU a C Td cell ENTE i C C p P P V O O O O O O C C C C C Appendix G Output Tables TABLE G 4 Variables of the RawDataTable Units Statistic wen se When Included in Table Calculation Name T_air 7 T_air 8 pump_ control Hz ye pump speed pump tmpr pump heat pump fan valve tmpr C valve heat valve fan intake heat STARTsequence STOPsequence seq ACTIVE valve mode ZeroSpanMode DO zero DO CO2 span DO H20 span interval counter end omit sequence index Newsite SiteOutput SiteAvgDisable Timelnfo The Timelnfo table stores all of the timing parameters for the automatic
58. it to the operating range 0 C to 55 C The pump module has a heater that turns on if pump_tmpr falls below 2 C If the pump temperature is too low check the operation of the heater which is controlled by public variable pump heat ON This variable 1s saved in RawData only if saving all diagnostics Its corresponding variable pump_heat_Avg is saved in the averaged output tables IntAvg CalAvg and SiteAvg The pump module has a fan that turns on if pump_tmpr rises above 50 C The fan will stay on until the pump temperature falls below 45 C Ifthe pump temperature 1s too high check the operation of the fan which is controlled by public variable pump fan ON This variable is saved in RawData only if saving all diagnostics Its corresponding variable pump fan Avg is saved in the averaged output tables IntAvg CalAvg and SiteA vo If the fan 1s on and the pump temperature is too high check the ambient temperature The AP200 is rated for ambient temperatures from 30 C to 45 C Bit 4 Pump pressure is not at the setpoint If bit 4 of diag_AP200 is set this indicates the pump is not able to control the pressure at the setpoint To confirm the problem compare the value of pump press to PUMP P SETPT Diagnostic bit 4 indicates they differ by more than 1 0 kPa Compare pump_press pressure measured at the pump inlet to cell_press pressure measured by the IRGA These two points are physically connected by a tube with relatively
59. l be included in the average for level 2 from 9 16 25 to 9 16 30 when the valve will switch to level 3 and so on Appendix D Valve Sequence Timing Example 2 LEVELS USED 5 STARTsequence set to True at 9 00 20 As shown in TABLE D 1 the cycle time for 5 levels is 90 s To synchronize with the real time clock the sequence must start at multiples of 90 s for example 9 00 00 9 01 30 9 03 00 etc Valve 1 will be selected as soon as STARTsequence is set True 9 00 20 but the sequence will not actually start until 9 01 30 Data will be included in the average for level 1 from 9 01 42 to 9 01 48 when the valve will switch to level 2 Data will be included in the average for level 2 from 9 02 00 to 9 02 06 when the valve will switch to level 3 and so on Calibration Sequence The calibration zero span sequence timing depends on the number of levels used and also on whether the zero span is merely to be checked or 1f the IRGA 1s to set 1ts internal zero and span coefficients In either case the zero span sequence cycle time 1s chosen to replace an integer multiple of profile sequences This allows a seamless transition back and forth between the profile sequence and the calibration sequence The zero span behavior 1s determined by two of the system configuration variables as shown in TABLE D 2 TABLE D 2 System Configuration Variables of Zero Span MEASURE_TANKS AUTO_ZEROSPAN Do not measure tanks Run E ig seq
60. lding the fitting body steady tighten the nut slightly with a wrench Tubing Campbell Scientific can provide several types and sizes of plastic tubing A tubing cutter pn 7680 can be used to cut these tubes TABLE B 1 Available Plastic Tubing Sizes Construction and Usage Guidelines CSI pn Tubing Type OD m ID in Length ft Ea 15703 19164 26506 25539 k u DURE Ca ue 0 LLDPE 1 2 3 8 Tubing inserts Black HDPE jacket overlapped aluminum tape ethylene copolymer liner Black linear low e 500 poiyeihylene Black high density polyethylene Aluminum layer limits diffusion best for sample tubes More flexible than HDPE Required for larger diameter Inserts are recommended for use in plastic tubing These inserts become permanently attached to the tubing at the first assembly so spare inserts may be needed for replacing the ends of tubing A Appendix B Using Swagelok Fittings FIGURE B 1 Swagelok insert TABLE B 2 Dimensions and Part Numbers for Swagelok Inserts Tubing OD in Tubing ID in Swagelok pn CSIpn 1 8 B 405 2 15834 1 4 1 4 B 405 170 15830 1 4 9845 3 8 17380 1 2 19495 3 8 Ferrules Each Swagelok fitting comes assembled with the front and back ferrules included These ferrules are permanently swaged onto the tubing at the first assembly so spare ferrules may be needed for replacing the ends of tubing Back ferr
61. ll during the H20 span procedure The steps below will measure these pressures as part of the H O span procedure PRESS AMBIENT and SpanCellP are used to calculate a pressure corrected span dew point temperature to send to the IRGA see Appendix I Useful Equations for details Remember that all three of these variables must be set for the IRGA H2O span setting to be enabled Do H20 Span seq ACTIVE STOPsequence cell press pump_ON H20SpanDewPt PRESS AMBIEN SETpressAmbi Td_cell Td_ambient cell press pump_ON SpanCellP SETspanCellP valve number diag AP200 Td_ambient DO H20 span Ifseq ACTIVE is True then set STOPsequence True to stop the sequence and then verify seq ACTIVE changes to False Variable cell press is the pressure in the IRGA sample cell Set pump ON False to turn the pump off You should hear the pump stop Wait for the value NOTE AP200 CO H 0 Atmospheric Profile System of cell_press to rise and stabilize to ambient pressure This may take several minutes as the intake tubes and mixing volumes fill with a r Make sure the dew point generator 1s connected to the H O Span inlet as shown in section 5 2 3 H 0 Span Consult the dew point generator s user manual for proper operation of the dew point generator Enter the dew point generator s temperature setpoint in C in H2OSpanDewPt While the pump is off and the IRGA sample cell s still at ambient pressure set SETpressAmbient True The AP
62. lly takes one or two minutes Record the value of CO This is the measured CO concentration in ppm If the zero tank is selected the value should be close to zero If the CO span tank is selected it should be close to the value of CO2 SPAN PPM Record the value of H2O This is the measured H O concentration in ppt The value should be close to zero for either tank Set valve number to CO span 10 and repeat the previous steps Press lt Esc gt to return to the Manual Zero Span menu 6 2 2 Do CO and H2O Zero At the Manual Zero Span menu select lt Do Zero CO2 amp H2O gt This menu guides you through the steps to flow the zero gas and to send the command to zero the IRGA Do Zero CO2 amp H2O seq ACTIVE STOPsequence valve number CO2 H20 diag AP200 DO zero If seq ACTIVE is True then set STOPsequence True to stop the sequence Then verify seq ACTIVE changes to False Set valve_number to Zero 9 Look at the LEDs on the valve module to confirm the Zero valve is now active Check the value of diag AP200 If it is not zero a problem in the AP200 system should be resolved before continuing see Appendix E 4P200 Diagnostics Wait for the value of CO and H 0 to stabilize This normally takes one to two minutes AP200 CO H 0 Atmospheric Profile System Set DO_zero to True The AP200 will send the commands to the IRGA to do a CO zero and then an H O zero While the IRGA is setting t
63. low approximately 10 is to be expected due to variation in the actual size of the orifices and in the calibration of the flow sensor For example at an elevation of 1000 m the nominal ambient pressure is 90 kPa which gives a nominal flow of 225 ml min The normal expected range for the flow would be from 200 to 250 ml min The flow will also vary with ambient temperature due to the corresponding change in air density Higher temperature air has lower density which will have lower flow approximately 2 lower flow for a 10 C temperature change The sample flow will decrease over time as particulates clog the inlet filters Eventually the flow will be reduced to the extent that it will degrade the equilibration time after an intake is selected As a general guideline the inlet filters should be replaced when the flow decreases by 25 The filters will normally last a few months but will require more frequent changes in dirty conditions The intake assembly has been designed with two separate elements intended to prevent condensation First the orifice has a small heater 0 07 W at 12 Vdc to warm the orifice approximately 5 C above ambient temperature This helps prevent condensation that is caused by adiabatic cooling as the air sample expands through the orifice Second the flow path downstream of the orifice is kept at reduced pressure typically 35 kPa below ambient pressure to prevent condensation 13 AP200 CO H 0 Atmosph
64. low flow such that they should be at similar pressures The measured pressure should agree within the combined uncertainty of the respective pressure sensors If they disagree by more than 4 kPa turn the pump off set pump_ON False and allow the system to stabilize at ambient pressure Compare each pressure sensor to the pressure expected for your elevation This test may help to diagnose a problem with the pump s pressure sensor Also see the notes on bit 7 If the pump pressure is too high check pump _ control If pump_control 0 this indicates the AP200 has turned the pump off There are several reasons the AP200 may shut the pump off e Low supply voltage see notes on bit 1 e Valve temperature out of range see notes on bit 2 e Pump temperature out of range see notes on bit 3 e Pump has been turned off by the user if public variable pump ON False set pump_ON True to turn the pump on If the pump pressure is too high and pump_control is gt 0 check the value of pump_speed to verify the pump is running If you have physical access to the AP200 listen for the sound of the pump to confirm it is running If the pump pressure is too high and the pump is running check the system for leaks Ifno leaks are found there may be a problem with the pump Contact Campbell Scientific for information on replacing the pump Appendix E AP200 Diagnostics If the pump pressure is too low check pump control and pump speed When the
65. mber An RMA number and product safety documents are required prior to any repair shipments being accepted at Campbell Scientific Consult with a Campbell Scientific applications engineer to determine which parts or assemblies should be sent for repair Do not attempt to disassemble the system without specific instructions from Campbell Scientific Exceptions are the IRGA and the NL115 CFM100 which are easy to remove and install If the system enclosure 1s to be returned plug the inlets and cap the ends of all tubes to keep debris out Swagelok caps and plugs have been provided for this purpose 49 AP200 CO H 0 Atmospheric Profile System 50 Appendix A AP200 AC DC Adapter Kit NOTE The 28549 AP200 AC DC Adapter Kit lets an AP200 CO H gt O Atmospheric Profile System to be powered from AC mains power To install the 28449 in an AP200 system enclosure untie the AC DC adapter output cable and feed 1t under the tubes below the AP200 pump module Position the AC DC adapter on the rubberized tab and secure 1t with the Velcro strap as shown in FIGURE A 1 a gt BN 79s 2 n ro FIGURE A 1 Installation location of AC DC adapter kit Bundle the cable leaving the connector end free and tie 1t down to the ribbon cable and the green grounding wires as shown in FIGURE A 2 CAMPBEL ts SCIENTIFI E in USA N FIGURE A 2 Bundled cable of AC DC adapter Strip the ends of the cable extension 3 8
66. mmon Accessories For details see the CFM100 CompactFlash Module Instruction Manual or the NL115 Ethernet and CompactFlash Module Instruction Manual and the Application Note 3SM F PC CF Card Information All manuals are available at www campbellsci com Requirement Oriven Solutions CFV 2GB TSI 3522 1433 FIGURE 4 5 CFMC2G 2GB CompactFlash memory card The AP200 can be ordered with an optional keyboard display factory mounted in the system enclosure FIGURE 4 6 This keyboard display provides a convenient user interface to change settings or view status and data in the field we FIGURE 4 6 AP200 keyboard display mounted in system enclosure This user interface is also available using a hand held detachable keyboard display such as the CR1000KD as described in Section 4 1 4 Other Accessories The CR1000KD may be preferred when multiple AP200s are to be maintained The factory mounted keyboard display is permanently attached so it cannot be forgotten or misplaced For more detail on the keyboard display see the CR1000 Measurement and Control System Operator s Manual AP200 CO H20 Atmospheric Profile System The AP200 can be configured with one of several mounting options for the system enclosure The AP200 system enclosure 1s similar to the Campbell Scientific ENC16 18 enclosure The same mounting options are available and outlined below Triangular tower UT10 UT20 or UT30 Tripod mast 1 5 in to 1 9 i
67. mperature probes Const N_AirTemps 8 number of 107 L temperature sensors to measure may be 1 to 8 or zero to disable air temperature measurements The value of this constant will determine how large to allocate the data array T_air how many measurements to make and how many temperatures to record in the output tables Data The real time air temperature measurements can be found in public variable T_air N_AirTemps T_air 1 will be the air temperature in C measured by the probe wired to SEI Additional probes wired to consecutive channels will be in consecutive elements of T_air The air temperature profile data will be saved in output tables RawData SiteAvg CalAvg and IntAvg Appendix D Valve Sequence Timing The AP200 has two valve sequences the profile sequence and the calibration zero span sequence The AP200 will run the majority of the time in the profile sequence cycling through the profile inlets in order from one to the number of levels selected 4 to 8 If configured for automatic zero span then the AP200 will periodically run the calibration sequence before returning to the profile sequence The timing of the valve switching depends on settings of the following system configuration variables see Section 5 4 1 System Configuration Variables for details on the system configuration variables LEVELS USED MEASURE TANKS AUTO _ZEROSPAN CAL INTERVAL CAL TIMEOFFSET Profile Sequence The profile seque
68. n diameter Tripod leg CM106 or CM106K tripod only Large pole 4 0 in to 10 0 in diameter No mounting bracket Consult the ENC10 12 ENC12 14 ENC14 16 ENC16 18 Instruction Manual avallable at www campbellsci com for details on mounting bracket options 4 1 3 Common Accessories Additional accessories are required to conduct sampling with the AP200 Some of the most common accessories are described here Tubing for Sampling A sample tube must be used to bring the air sample from each intake assembly to the AP200 system enclosure Normally bulk tubing 1s cut to length and installed on site Campbell Scientific pn 15702 or its equivalent is recommended This tubing has a 0 25 in outer diameter to fit the Swagelok fittings on the intake assemblies and the system enclosure The tubing has an aluminum core to minimize diffusion through the tubing wall and a UV resistant black high density polyethylene jacket Maximum tubing length available 1s a 500 ft roll Intake Heater Cabling The intake assemblies have a small heater at the orifice to prevent condensation caused by adiabatic cooling as the air sample expands through the orifice For normal applications bulk cable 1s cut to length and installed on site to provide power to the intake assemblies Heater cables may be daisy chained from one intake assembly to the next Campbell Scientific pn 9922 cable or its equivalent is recommended for this connection This cable consists of a twiste
69. n the averages For this example the number of samples in the half hour averaging interval will be 5 s x 2 samples s x 15 cycles 150 samples This number will change if a different number of levels is used or if a zero span sequence 1s run during the averaging interval If fewer than eight levels are used as determined by system configuration variable LEVELS USED the unused levels will contain 0 or NAN Note The columns for extra levels will be omitted if constant MaxLevels has been set to a value less than 8 See Section 5 4 2 Compile Switches for details on setting program constants Following the level specific data are several other parameters that apply to all levels The first four are similar to the level specific data they are averaged only during the time end_omit True The rest of the parameters are averages that include all data regardless of end_omit At the end of the table are the average air temperatures for the optional temperature profile These data will be included only as specified by constant N_AirTemps See Section 5 4 2 Compile Switches for details on setting program constants The variables stored in IntA vg are listed below including notes on when samples are included in the statistic and when the variable will be included in the table TABLE G 1 Variables of the IntAvg Table Name Units Statistic Vhen Used in When Included in Calculation Table G 1 Appendix G Output Tables TABL
70. nce cycles through the profile inlets in order starting at 1 and ending at the value of LEVELS USED This cycle repeats until 1t 1s interrupted for an automated calibration sequence if this feature is enabled or until the sequence is stopped by the user The AP200 has pre programmed parameters that determine the timing of the profile sequence These timing parameters allow for at least 15 s on each level with 10 s omitted to allow the CO and H O concentrations to equilibrate and 5 s included in the average In addition to these constraints the timing parameters depend on the number of levels used LEVELS USED to give an integer number of complete cycles in each half hour averaging period As shown in TABLE D 1 the timing for 4 6 or 8 levels simply use these minimum values giving 15 20 or 30 cycles per half hour The times are extended slightly for 5 or 7 levels to give integer number of cycles per half hour TABLE D 1 Profile Sequence timing Variables Number Time on Omitted Averaged Cycle Cycles of Levels Level s Time s Time s Time s Half Hour 18 s on level 1 with 12 s omitted 17 s with 11 s omitted for the rest of the levels D 1 Appendix D Valve Sequence Timing The profile sequence timing parameters are implemented in the AP200 CRBasic program as a set of three arrays These arrays have eight locations to accommodate up to eight levels These arrays are not accessible in the Public table but they are output
71. nclosure Each cylinder must have a pressure regulator to control the outlet pressure at 0 psig and must have a 0 25 in Swagelok fitting on the outlet Connect these fittings to the valve module inlets using 0 25 in OD tubing such as pn 15702 Minimize the length of these tubes to reduce the equilibration time after the zero or CO span cylinder is selected FIGURE 5 7 illustrates this configuration Refer to Appendix B Using Swagelok Fittings for information on installing and replacing Swagelok fittings For convenience Campbell Scientific can supply pre swaged tube assemblies pn 21823 L for this purpose AS ESD ED FS gt FIGURE 5 7 AP200 system enclosure configured with cylinders of zero air and CO Flow meters and needle valves are not needed because the AP200 zero and span inlets have flow restriction inside the system enclosure to set the flow rate Make sure there are no leaks in the regulators or the connections to the valve module For automatic operation the tank shutoff valves are left continuously open A plumbing leak could cause the contents of the tank to be lost When inlets are not in use replace the Swagelok plug to keep the system clean Open the shut off valves on the cylinders and set the pressure regulators for 0 psig delivery pressure NOTE 5 2 3 H20 Span 9 3 Wiring AP200 CO H 0 Atmospheric Profile System If you inadvertently adjust the pressure too high you may need to sligh
72. nd Standard or Commercial Grade Industrial Grade PC CF cards are certified to a higher standard in that they are designed to operate over a wider temperature range offer better vibration and shock resistance and have faster read write times than their commercial counterparts Campbell Scientific recommends the use of industrial grade cards such as the CFMC2G FIGURE 4 5 available from Campbell Scientific For more details about this card see Application Note 3SM F PC CF Card Information available from www campbellsci com USB Memory Card Reader Writer The 17752 USB memory card reader writer shown in FIGURE 4 8 1s a single slot high speed reader writer that allows a computer to read a memory card When used with Campbell Scientific equipment the 17752 typically reads data stored on CompactFlash cards but 1t can read many different types of memory cards The 17752 connects to the computer s USB port FIGURE 4 8 17752 USB memory card reader writer Temperature Probes The AP200 system can measure a temperature profile at up to eight levels using 107 L temperature probes The 107 is a rugged accurate probe that measures air temperature from 35 C to 50 C The L denotes that the cable length 1s specified at the time of order AP200 CO H 0 Atmospheric Profile System Radiation Shield Each 107 L temperature probe is normally mounted with a 41303 5A radiation shield The 41303 5A is a naturally aspirated six plate radiation
73. nded on a UT30 tower ceceeeeeeeseersessstesteeeeeees 26 5 10 Cable feedthrough cap shown removed to admit cables into the SYSIEM ENLLOSURe N 27 5 11 Proper wiring of heater cable onto DIN bus of AP200 S VSCOM CNCLOS en N 27 5 12 Use AP200 system screwdriver to open contacts for wiring healer Cable en Eee euer 28 5 13 Tabs for opening intake assembly ooooccccccnccnncnnnnnnnnnnnnnononononos 28 14 Wiring of heater cable on AP200 intake assembly 29 5 15 Three intake assemblies with heater cables daisy chained to the AP200 system enclosure ansehe 30 5 16 Proper wiring of power cable onto DIN bus of AP200 system TNC A ee ne A A A AA A nt E E 31 5 17 Power cables secured to cable tie loop on pump module of AP200 A SI eh 31 5 18 Cut away view showing proper replacement of feedthrough cap 32 7 1 Intake filter shown removed from rain diverter 45 7 2 Installed IRGA in system enclosure oooooncnncnnonononononoooonoonoonnnnononnnnnnnnnos 46 7 3 Components and fittings of IRGA installation ooccccccnnnnnnoononcnonos 47 A 1 Installation location of AC DC adapter kit A 1 A 2 Bundled cable of AC DC adapter A 1 AP200 Table of Contents Tables A 3 Ends of AC DC cable extension connected to AP200 power input EIN lcs A nee dd de A 2 A 4 AC power cord secured within AP200 system enclosure
74. nnconononoccnononcccnnnnnnnanancnnnnnnos G 8 G 5 Variables of the Timelnfo Table G 10 G 6 Variables of the message log Table oooooonnnnnnnnncucncnononaoaoooooooonononoss G 12 AP200 CO H 0 Atmospheric Profile System 1 Introduction The AP200 CO H O Atmospheric Profile System AP200 measures atmospheric carbon dioxide and water vapor at up to eight positions Intake assemblies are normally spaced along the height of a tower to enable measurement of a vertical profile The AP200 is commonly used in conjunction with an eddy covariance system to measure the storage term to give a more complete measurement of the surface exchange Before using the AP200 please study e Section 2 Cautionary Statements e Section 3 Initial Inspection e Section 5 Installation Operational instructions critical to preserving accurate measurements of the system are found throughout this manual Before using the AP200 please study the entire manual Several other user manuals provide additional information and should be consulted before using the AP200 These include CR1000 Measurement and Control System Operator s Manual CFM100 CompactFlash Module Instruction Manual NL115 Ethernet and CompactFlash Module Instruction Manual Application Note 3SM F PC CF Card Information ENCI10 12 ENC12 14 ENC14 16 ENC16 18 Instruction Manual CM106 Tripod Instruction Manual Tripod Installation Manual Models CMI 10 CMI 15 CM120 Model 107 Temperature Probe Instr
75. ns in ambient concentrations of CO and H O E CAMPBELL SCIENTIFIC 1 FIGURE 4 2 Side view of AP200 intake assembly AP200 CO H 0 Atmospheric Profile System 4 1 2 Optional Components The AP200 requires an LI 840A analyzer manufactured by LI COR Inc Lincoln NE to measure CO and H O concentrations This infrared gas analyzer herein referred to as the IRGA can be provided as a factory installed option or it can be provided by the user The AP200 is designed for easy installation of the LI COR IRGA The IRGA installed in the AP200 enclosure is shown in FIGURE 4 3 For complete details see the LI 840A instruction manual available at www licor com FIGURE 4 3 The IRGA installed in the AP200 system enclosure To store data on a CompactFlash CF memory card the AP200 requires either an NL115 or a CFM100 FIGURE 4 4 both available from Campbell Scientific Either storage module will provide data storage The NL115 has the added capabilities provided by an Ethernet interface FIGURE 4 4 Campbell Scientific NL115 and CFM100 CompactFlash storage modules The AP200 can be ordered with either the NL115 or the CFM100 module factory installed or 1t can be ordered with neither Ifthe AP200 s ordered NOTE AP200 COy H3 O Atmospheric Profile System without a storage module the user must provide one The CF card FIGURE 4 5 for the storage module can be ordered separately from www campbellsci com see 4 1 3 Co
76. o the Exhaust fitting on the bottom of the system enclosure This fitting has a screen to prevent insects or debris from entering when the pump is off If exhausting the air samples at this location is a problem for example if it is close enough to an inlet to affect its measurement this screen may be removed AP200 COy H3 O Atmospheric Profile System and a tube may be attached to divert the pump exhaust to another location The screen may be attached to the end of the tube with a Swagelok union In most cases the screen may simply be left in place 4 3 Specifications 4 3 1 CO2 H20 Analyzer CO and H0 are measured with an LI 840A IRGA See the LI 840A manual available at www licor com for specifications 4 3 2 System Enclosure Dimensions 52 1 cm x 44 5 cm x 29 7 cm 20 5 in x 17 5 in x 11 7 in Weight AP200 base model 15 9 kg 35 0 1b Options IRGA 1 0 kg 2 3 lb CR1000KD 0 3 kg 0 7 lb CFM100 NL115 0 2 kg 0 4 lb Operating Temperature 30 C to 45 C Power Requirement Voltage 10 Vdc to 16 Vdc Power Maximum cold start up 3 75 A 45 0 W Average power varies from 12 5 W above 35 C to 22 5 W at 30 C as shown in FIGURE 4 20 25 20 O A N a 15 10 30 20 10 0 10 20 30 40 Temperature deg C FIGURE 4 20 Average power output relative to temperature 17 AP200 CO H 0 Atmospheric Profile System 18 Pump Module Pump type
77. o high Ifthe sample cell temperature is above 52 C make sure the ambient temperature is no higher than 45 C and contact LI COR if the problem persists Bit 7 Cell pressure is not at the setpoint If bit 7 of diag_AP200 is set this indicates the IRGA sample cell pressure s not at the setpoint Compare the value of cell_press to PUMP_P SETPT Diagnostic bit 7 indicates they differ by more than 2 0 kPa The AP200 will control the speed of the sample pump to maintain pump_press measured at the inlet of the pump at the setpoint pressure PUMP_P SETPT If there 1s a problem with the pump this will normally result in both bits 4 and 7 being set see the notes above on bit 4 Having two independent diagnostics allows some insurance that both of the pressure sensors are working properly Compare cell_press pressure measured by the IRGA to pump_press pressure measured at the pump inlet These two points are physically connected by a tube with relatively low flow such that they should be at s milar pressures The pressure values should agree within the combined uncertainty of the respective pressure sensors If they disagree by more than 4 kPa turn the pump off set pump_ON False and allow the system to stabilize at ambient pressure Compare each pressure sensor to the pressure expected for your elevation This test may help to diagnose a problem with the pump s pressure sensor or the IRGA s pressure sensor Appendix F Public Vari
78. o zero the values for CO and H20 will not be available and NAN will be displayed This will take approximately 20 s When the process is complete CO and H20 will again be displayed Verify that both of these values are close to zero Press lt Esc gt to return to the Manual Zero Span menu 6 2 3 Do CO Span At the Manual Zero Span menu select Do CO2 Span This menu guides you through the steps to begin flow of the CO span gas and to send the command to the IRGA to set its CO span Do CO2 Span seq ACTIVE STOPsequence CO2 SPAN_PPM valve number diag AP200 CO2 DO CO2 span If seq ACTIVE is True set STOPsequence True to stop the sequence Then verify that seq ACTIVE changes to False Check the value of CO2 SPAN PPM This is the span value that will be sent to the IRGA Ensure that the value 1s correct for the concentration in the CO span tank Set valve number to CO2span 10 Look at the LEDs on the valve module to confirm the CO span valve 1s now active Check the value of diag AP200 If it is not zero a problem in the AP200 system should be resolved before continuing see Appendix E AP200 Diagnostics Wait for the value of CO to stabilize This normally takes one to two minutes Set DO CO2 span to True The AP200 will send the command to the IRGA to do a CO span While the IRGA is setting the span the value for CO will not be available and NAN will be displayed This will take approximately 10 s When
79. ofile System 48 Description Sample cell temperature Sample cell pressure Td_cell H20 dew point 7 5 Zero Span Flow message log output table when the configuration command is sent and when the settings are acknowledged The IRGA settings are given in TABLE 7 1 TABLE 7 1 IRGA Settings OUTRATE Output data every 0 5 s The outputs from the IRGA are shown in TABLE 7 2 and include TABLE 7 2 IRGA Outputs CO concentration HO concentration The flow for the zero and CO span tanks 1s affected by the pressure regulator performance Pressure regulators designed for a low delivery pressure will generally perform better and should be used where possible To adjust these regulators start with them set for 0 psig outlet pressure Select the corresponding inlet and observe the sample flow Adjust the regulator outlet pressure to give approximately the same sample flow as for the profile inlets within 10 Most pressure regulators will regulate the pressure only when there 1s flow through them When the flow stops because the AP200 selects some other valve the pressure will rise above the setting It w ll remain high until the zero or CO span valve is again selected and the flow can resume The flow will be higher than normal because pressure 1s higher than normal until the excess pressure 1s bled from the regulator and tube Most pressure regulators will also be affected by ambient temperature If the zero or CO s
80. pan sample flow varies excessively as the ambient temperature changes or if the pressure rise at shut off is excessive consider using a different regulator The amount of zero or CO span gas consumed depends on the details of the application The following example shows how to estimate the expected consumption 8 Repair AP200 CO H20 Atmospheric Profile System Assume there are eight profile levels and that the AP200 is configured to set the zero and span every four hours From Appendix D Valve Sequence Timing the zero span sequence will select the CO span tank for 40 s the zero tank for 100 s and then the CO span tank again for 70 s The total sequence time for the CO span tank will be 110 s as 40 s 70 s 110s and 100 s for the zero tank Assuming a flow of 250 ml min each zero span cycle will consume 250 ml min 110 s 1 min 60 s 1 L 1000 ml 0 46 L for the CO span tank and 250 ml min 100 s 1 min 60 s 1 L 1000 ml 0 42 L for the zero tank Rounding this volume up to 0 5 L and assuming the tanks hold 200 cf 5 7 m each tank will last 5 7 m 1000 L m 0 5 L 11 400 zero span cycles At a 4 hr interval this is 1 900 days or more than five years The AP200 is designed to give years of trouble free service with reasonable care However 1f factory repair is needed first contact a Campbell Scientific applications engineer to obtain an RMA Return Materials Authorization nu
81. pendix gives a few tips on using Swagelok tube fittings For more information consult your local Swagelok dealer or visit their website at www swagelok com General Notes e Do not use fitting components from other manufacturers They are not interchangeable with Swagelok fittings e Do not attempt to use metric fittings 6 0 mm is very close to 0 25 in but they are not interchangeable Metric fittings can be identified by the stepped shoulder on the nut and on the body hex e Make sure that the tubing rests firmly on the shoulder of the fitting body before tightening the nut e Never turn the fitting body Instead hold the fitting body and turn the nut e Keep tubing and fittings clean Always use caps and plugs to keep dirt and debris out e Do not overtighten fittings as it will damage the threads e Ifa nut cannot be easily tightened by hand it is an indication that the threads have been damaged Replace any damaged nuts and fittings The first time a Swagelok fitting 1s assembled the ferrules become permanently swaged onto the tube Assembly instructions vary depending on plastic or metal tubing The assembly instructions are also slightly different for an initial installation than for subsequent reassembly First time assembly plastic tubing 1 Cut the tubing to length 2 Make sure the cut is square and free of burrs 3 Some types of plastic tubing have an aluminum layer Take care not to flatten the tube
82. pressure falls below the setpoint the AP200 will respond by reducing pump_control This should reduce pump_speed and allow pump_press to rise to the setpoint If pump_ control 0 but the pump is still running contact Campbell Scientific If the pump speed is oscillating check the value of BuffDepth This variable is found in the Status table see the CR 000 User Manual at www campbellsci com for more information The AP200 CRBasic program runs in Pipeline mode which allows measurements to stay on schedule even when processing tasks fall behind BuffDepth indicates how far processing has fallen behind measurements number of scans If processing falls too far behind the delay between measuring the pump pressure and adjusting the pump speed can cause the pump speed to oscillate Normally BuffDepth will be 2 or less Ifthe value 1s higher than 2 contact Campbell Scientific Bit 5 Sample flow is outside its normal range If bit 5 of diag_AP200 is set this indicates the sample flow is outside the normal range To confirm this error check the value of sample flow which is measured by a mass flow sensor mounted on the outlet of the valve manifold The sensor measures the flow to the IRGA The normal range for the sample flow 1s 100 to 300 ml min If the sample flow 1s outside this range see the appropriate section below Profile Inlets The sample flow for profile inlets is set by an orifice in the intake assembly See Section 4 2 1 Intak
83. r each of the CO zero H20 zero and CO span commands The memory card has space allocated for 28 800 records 100 days with a calibration sequence every 30 min The CPU has space allocated for 288 records The message log table also includes several values to document the state of the AP200 in case of trouble TABLE G 6 Variables of the message log Table TIMESTAMP RECORD message str diag AP200 sequence index smpl counter valve mode ZeroSpanMode Appendix H Keyboard Display Menu The AP200 CRBasic program includes a custom menu for the keyboard display This menu provides a user friendly interface for some of the more common functions which are shown below The custom menu can be bypassed such that the user can interact directly with the datalogger through the datalogger s default menus To bypass the custom menus select lt System Menu gt AP200 Menu Check Status Manual ValveControl Manual Zero Span Configure System System Menu Check Status diag AP200 CO2 H20 seq ACTIVE valve number sample flow cell press Manual ValveControl STOPsequence STARTsequenc seq ACTIVE valve_number sample_ flow CO2 H20 H 1 Appendix H Keyboard Display Menu Manual Zero Span Check Span Zero Do Zero CO2 amp H2O Do CO2 Span Do H20 Span seq ACTIVE valve number STARTsequenc Check Span Zero seq ACTIVE STOPsequence valve number CO2 SPAN_PPM diag AP200 CO2 H20 Do Zero CO2 amp H2
84. ressure used to calculate Td ambient and for H O span setpoint pressure for the pump speed control number of profile levels to be used set to True to automatically measure zero and span tanks set to True to zero and span the IRGA when tanks are measured time between automatic zero span sequences time offset for starting automatic zero span sequences CO concentration in the CO span tank AP200 will shut down if supply voltage falls below this limit AP200 will power up 1f supply voltage rises this much above lower limit F Appendix F Public Variables Appendix G Output Tables The AP200 program stores data in several output tables Details are given for each table IntAvg The primary output table is IntAvg Interval Average A record is written to this table at the end of every output interval 30 min Space is allocated on the memory card for 4 800 records 100 days at one record per 30 min The CPU has storage allocated for 480 records 10 days This table has a set of values for each level that includes CO2 H2O cell tmpr cell press NumSamples and sample flow These values are averages of all samples on that level after omitting data subsequent to the valve switch for equilibration For example if all eight levels are used the cycle time is 2 min In each 2 min cycle the AP200 will spend 15 s on each level one to eight For each level the first 10 s are omitted and the remaining 5 s are included i
85. s performed by Campbell such as programming to customer specifications electrical connections to products manufactured by Campbell and product specific training is part of Campbell s product warranty CAMPBELL EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Campbell is not liable for any special indirect incidental and or consequential damages Assistance Products may not be returned without prior authorization The following contact information is for US and international customers residing in countries served by Campbell Scientific Inc directly Affiliate companies handle repairs for customers within their territories Please visit www campbellsci com to determine which Campbell Scientific company serves your country To obtain a Returned Materials Authorization RMA contact CAMPBELL SCIENTIFIC INC phone 435 227 9000 After an applications engineer determines the nature of the problem an RMA number will be issued Please write this number clearly on the outside of the shipping container Campbell Scientific s shipping address 1s CAMPBELL SCIENTIFIC INC RMA 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our web site at www campbellsci com repair A completed form must be
86. s a three way solenoid valve that connects it to one of the two outlets This valve connects its corresponding inlet to the bypass outlet when it 1s off and to the sample outlet when it is energized The sample outlet connects to the CO H O analyzer and the bypass outlet connects directly to the pump Therefore the sample inlets will have a continuous flow regardless of which inlet s sampled by the analyzer This continuous flow stores an air sample history in the intake assembly mixing volumes keeps the mixing volumes and sample tubes at low pressure to prevent condensation and minimizes flow and pressure transients caused by valve switching The zero span inlets are not bypassed thereby allowing flow only when they are selected These inlets have flow restriction tubes connecting the bulkhead fittings to the valve manifold to set the flow These tubes have the same outer AP200 COy H3 O Atmospheric Profile System diameter 0 062 1n as the ones for the air sample inlets but they have a smaller inner diameter 0 015 in compared to 0 040 in This provides a flow restriction similar to the orifices in the AP200 intake assemblies The flow for the zero and CO span tanks is affected by the pressure regulator setting The valve manifold has a mass flow sensor on the sample outlet This sensor s measurements are reported in public variable sample flow The valve manifold temperature is reported in public variable valve_tmpr The operatin
87. sconnecting tubes and install caps and plugs on tubes and fittings when they are not in use e Excessive bending Be careful to observe the minimum bend radius and avoid bending the tube near the end at the connections AP200 CO H 0 Atmospheric Profile System 7 2 Enclosure Desiccant CAUTION Check the humidity indicator card in the mesh pocket in the AP200 system enclosure door The humidity indicator card has three colored circles that indicate the percentage of humidity Desiccant packets inside the enclosure should be replaced with fresh packets when the upper dot on the indicator begins to turn pink The indicator card does not need to be replaced unless the colored circles overrun Campbell Scientific strongly suggests replacing desiccant instead of reactivating old desiccant Improper reactivation can cause the desiccant packets to explode If the user is determined to reactivate old desiccant packets follow the procedure provided in the ENC 16 18 User Manual The replacement desiccant pack 1s the 4905 Single 4 Unit Silica Desiccant Bag The 4905 can be purchased in quantities of 20 as pn 6714 The replacement humidity indicator card 1s pn 28878 If the desiccant packs are being replaced very frequently make sure the feedthrough cap is properly installed see Section 5 3 3 Power and FIGURE 5 18 In very humid conditions 1t may be helpful to seal the cable feedthrough with plumber s putty 7 3 Intake Filters The in
88. shield Its louvered construction allows air to pass freely through the shield serving to keep the probe at or near ambient temperature The shield s white color reflects solar radiation The temperature probe with its accompanying radiation shield is shown in FIGURE 4 9 FIGURE 4 9 107 L temperature probe mounted with radiation shield 4 1 4 Other Accessories Portable Keyboard The CR1000KD shown in FIGURE 4 10 1s a portable keyboard and display screen for the CR1000 datalogger It allows you to check the datalogger s status display or plot sensor readings and stored values and to enter numeric data It is similar to the hard mounted keyboard display option for the AP200 but the CR1000KD may be carried from station to station and 1s useful when multiple AP200s are being maintained FIGURE 4 10 CR1000KD handheld keyboard display AP200 CO H 0 Atmospheric Profile System 4 1 5 Support Software There are several software products available from Campbell Scientific to allow the user to connect a PC to the AP200 s datalogger PC200W PC200W 1s a free starter software package that provides basic tools clock set program download monitor data retrieve data etc The PC200W supports direct connections between PC and datalogger but has no telecommunications or scheduled data collection support PC400 PC400 is a mid level software package that supports a variety of telecommunication options manual data collection data di
89. splay and includes a full featured CRBasic program editor PC400 does not support combined communication options for example phone to RF PakBus routing or scheduled data collection LoggerNet LoggerNet is a full featured software package that supports programming communication and data collection and display LoggerNet consists of a server application and several client applications integrated into a single product This package 1s recommended for applications that require telecommunications support or scheduled data retrieval or for large datalogger networks LoggerLink Mobile Apps The LoggerLink Mobile Apps allows an iOS or Android device to communicate with an IP enabled datalogger such as the CR1000 in the AP200 The apps support field maintenance tasks such as viewing and collecting data setting the clock and downloading programs 4 1 6 Replacement Parts Filters pn 27809 is a 2 5 cm 1 0 in diameter sintered stainless steel disk filter FIGURE 4 11 of 10 micron pore size It is used to replace dirty filter elements in the AP200 intake assembly FIGURE 4 11 Disk Filter of AP200 intake assembly Silica Desiccant Bags The 4905 Single 4 unit Silica Desiccant Bag FIGURE 4 12 1s used to desiccate the AP200 system enclosure and should be periodically replaced The 4905 can be purchased in quantities of 20 as pn 6714 10 AP200 CO H 0 Atmospheric Profile System FIGURE 4 12 Single desiccant pack Humidity In
90. steel tubes that connect the bulkhead fittings to the valve manifold See Section 4 2 2 Valve Manifold for details If the flow goes too high at a valve switch but comes into the normal range in a few seconds this is normal It is caused by the pressure regulator on the tank See notes on pressure regulators in Section 7 5 Zero Span Flow As long as the sample flow 1s within the normal range by the time the data are included in the average this is acceptable If the flow for a zero or CO span inlet stabilizes at a flow that is too high or too low this s most likely caused by the pressure setting on the regulator Adjust the pressure regulator to give the desired sample flow with the corresponding inlet selected Bit 6 Cell temperature is outside its operating range If bit 6 of diag_AP200 is set this indicates the IRGA sample cell temperature is outside the normal range To confirm this error check the value of cell_tmpr which is measured by the IRGA The normal range for the sample cell temperature is 48 C to 52 C The IRGA heats the sample cell to maintain 1ts temperature at a nominal 50 C It may take several minutes to stabilize at this temperature when the system 1s powered up as much as 20 or 30 min if starting from 20 C If the system has been powered for at least 30 min and the cell temperature is still below 48 C contact LI COR The IRGA does not actively cool the sample cell when the ambient temperature is to
91. take filter is shown in FIGURE 7 1 Over time the filter will become plugged with particulates from the air causing a reduction in flow To replace the filter lift one side of the pliable rain diverter away from the disk and pull out the spent disk Replace 1t with Campbell Scientific pn 27809 If replacing the filter does not restore the flow contact Campbell Scientific FIGURE 7 1 Intake filter shown removed from rain diverter 45 AP200 CO H 0 Atmospheric Profile System 46 7 4 LI 840A IRGA Consult the LI COR LI 840A manual at www licor com for details on maintaining the IRGA The following section gives details on installation removal and configuration of the IRGA as 1t relates to 1ts installation in the AP200 7 4 1 Installing and Removing the IRGA The IRGA is easily installed or removed from the AP200 system The installed IRGA is shown in FIGURE 7 2 To install the IRGA in the AP200 Disconnect power from the AP200 Insert the IRGA into 1ts mounting bracket and secure 1t with the Velcro strap Remove the union fitting that connects the IN tube to the OUT tube Remove the green vinyl caps from the IRGA fittings slide the caps onto the union and store the union in the storage pocket in the door of the AP200 system enclosure Connect the inlet and outlet tubes to the IRGA connect IN to IN and OUT to OUT Push the tube fully onto the fitting and tighten the knurled nut b
92. talling and removing the IRGA and see the LI 840A IRGA user manual for details on performing the zero and span outside the AP200 system 2 The IRGA zero and span may be performed manually without removing the IRGA from the AP200 Further details for this option are given in Section 6 2 Manual Zero and Span 3 The IRGA zero and CO span may be performed automatically by the AP200 system This option can zero both CO and H20 but it can span only CO Itis not practical to automatically span H O because of the difficulty in providing an online H O span gas dew point generator in the field Further details for this option are given in Section 6 1 Automatic Zero and Span See Sections 5 2 2 Zero and CO Span and 5 2 3 H 0 Span for details on plumbing connections to zero and span the IRGA while installed in the AP200 The following sections give details on configuring the AP200 for automatic or manual zero and span 6 1 Automatic Zero and Span NOTE This section describes how to configure the AP200 for periodic automated zero CO and H20 and CO span of the IRGA Five public variables are used to configure the AP200 for automatic zero and span These variables may be edited with keyboard display either at the Configure System menu or through the normal Public Table They may also be edited using LoggerNet These variables are stored in the sys conf var dat file so their values will be saved 1f the program 1s recompiled See S
93. the process is complete CO will again be displayed Verify the value is close to the value of CO2 SPAN PPM Press lt Esc gt to return to the Manual Zero Span menu 6 2 4 Do H20 Span At the Manual Zero Span menu select Do H20 Span This menu guides you through the steps to flow the H O span gas and to send the command to the IRGA to set its H O span 41 AP200 CO H20 Atmospheric Profile System 42 H20 is more difficult to span than CO due to the difficulty of providing a source of air with known humidity Therefore a dew point generator such as the LI 610 LI COR Inc Lincoln NE is used for many applications An additional complication 1s the need to correct the dew point temperature for the difference in pressure between the dew point generator and the IRGA sample cell The AP200 is capable of making this correction but three variables must be set first H2OSpanDewPt This variable is the dew point temperature setting in C on the dew point generator Any value may be entered for H2OSpanDewPt However the IRGA H 0 span setting will be disabled unless the value is between 0 and 20 The default is 99 to intentionally disable setting the H O span until the user enters the value for the dew point generator PRESS AMBIENT This variable is the ambient pressure kPa which is assumed to be the same as the pressure in the dew point generator SpanCellP This variable given in kPa is the pressure in the IRGA sample ce
94. their normal values See Appendix F Public Variables for details 5 6 3 On site System Checks There are several important checks that can be done on site during initial installation and during routine site visits to retrieve data and maintain the system NL115 or CFM100 Check that the status LED is blinking red periodically indicating that data are being written to the card See the NL115 or CFM100 manual for details Sample pump Listen to the sample pump which should be making a steady hum A slight change in pitch 1s normal when switching between the calibration and profile sequences but a sustained oscillation in the pitch indicates a problem See Appendix E 4P200 Diagnostics Bit 4 Enclosure humidity Check the humidity indicator card on the door of the AP200 system enclosure and replace the desiccant when the humidity reaches 50 See Section 7 2 Enclosure Desiccant Zero and span tanks Check the tank and regulator outlet pressures It 1s recommended to log the tank pressures at each site visit and note the trend 37 AP200 CO H 0 Atmospheric Profile System 6 38 Infrared Gas Analyzer IRGA Zero and Span The IRGA should be zeroed and spanned periodically to maintain its accuracy There are three ways to accomplish this l The IRGA can be removed from the AP200 system and zeroed and spanned per the manufacturer s recommendation See Section 7 4 1 Installing and Removing the IRGA for instructions on ins
95. tly loosen the tube fitting to bleed off the excess pressure Retighten the fitting when the proper setting is reached The H20 span can be performed only as a manual operation Automated H O span is not feasible because it would require a dew point generator to provide the H O span gas all the time The H O span inlet is not bypass equipped so it will flow only when selected This inlet can be connected to the output of a dew point generator using a tee at the inlet as shown in FIGURE 5 8 to bleed off excess flow and avoid pressurizing the dew point generator Bi 5 FIGURE 5 8 H O span inlet configured for a dew point generator 5 3 1 Ground Connection The AP200 must be earth grounded Refer to section 7 1 ESD Protection in the CR1000 Measurement and Control System Operator s Manual for information on earth grounding and lightning protection All component grounds of the AP200 profile system are pre wired at the factory to a common ground lug located at the bottom of the enclosure Ground this lug using heavy gauge copper wire An AP200 grounded to the UT30 tower 1s shown in FIGURE 5 9 25 AP200 CO H 0 Atmospheric Profile System 26 FIGURE 5 9 AP200 earth grounded on a UT30 tower 5 3 2 Intake Heater Cables NOTE The AP200 intake assemblies have a small heater at the orifice to prevent condensation caused by adiabatic cooling as an a r sample expands through the orifice Power for these heaters is availa
96. ts operating range This triggers the AP200 to shut down the valves and pump to protect the valves from possible damage To confirm the problem verify that public variable valve_tmpr_OK False This variable is set to True if the valve temperature is within its operating range and 1s set to False if it is outside this range For diagnosing a problem using data saved in the output tables IntA vg CalAvg or SiteAvg the variable valve tmpr_OK is not available Instead check the value of ValveTmprOK Avg This is a floating point number that represents the fraction of time from 0 to 1 that valve tmpr_OK is true during the averaging period A value of 1 indicates no valve temperature problem at any time during the averaging period A value of 0 indicates a valve temperature problem during the entire time Also check the measured valve temperature valve_tmpr and compare it to the operating range 4 C to 49 C The valve module has a heater that turns on if valve tmpr falls below 5 C If the valve temperature is too low check the operation of the heater which is controlled by public variable valve heat ON This variable is saved in RawData only if saving all diagnostics Its corresponding variable valve heat Avg is saved in the averaged output tables IntAvg CalAvg and SiteAvg The valve module has a fan that turns on if valve_tmpr rises above 45 C The fan will stay on until the valve temperature falls below 43 C Ifthe valve tempera
97. ture is too high check the operation of the fan which is controlled by public variable valve fan ON This variable is saved in RawData only if saving all diagnostics Its corresponding variable valve fan Avg is saved in the averaged output tables IntAvg CalAvg and SiteA vo If the fan is on and the valve temperature is too high check the ambient temperature The AP200 is rated for ambient temperatures from 30 C to 45 C Bit 3 Pump temperature is outside its operating range Bit 3 of diag AP200 indicates the pump temperature is outside 1ts operating range This triggers the AP200 to shut down the pump and valves to protect the pump from possible damage To confirm the problem verify that public variable pump tmpr OK False This variable is set to True if the pump temperature is within its operating range and is set to False if it is outside this range For diagnosing a problem using data saved in the output tables IntAvg CalAvg or SiteAvg the variable pump tmpr OK is not available Instead check the value of PumpTmprOK Avg This is a floating point number that represents the fraction of time from 0 to 1 that pump_tmpr_OK is true during the averaging period A value of 1 indicates no pump temperature problem at any time during the averaging period A value of 0 indicates a pump temperature problem during the entire time E 3 Appendix E AP200 Diagnostics Also check the measured pump temperature pump_tmpr and compare
98. uare hole to open the spring loaded contacts as shown in FIGURE 5 12 Insert the wire nto the corresponding round hole and remove the screwdriver Gently tug the wire to confirm it 1s secure FIGURE 5 12 Use AP200 system screwdriver to open contacts for wiring heater cable Route the heater cable to the first intake assembly and cut it to the needed length Open the intake assembly cover by gently spreading the tabs on the lower front corner and tilting 1t back See FIGURE 5 13 FIGURE 5 13 Tabs for opening intake assembly 28 AP200 CO H 0 Atmospheric Profile System Loosen the nut on one of the three cable glands to avoid the risk of dropping the nut do not remove it completely Insert the cable and tighten the nut Connect the red and black wires to the corresponding terminal blocks as shown in FIGURE 5 14 FIGURE 5 14 Wiring of heater cable on AP200 intake assembly Insert and connect a second length of heater cable for the next intake assembly Continue this daisy chain from one intake assembly to the next until all of the intake assemblies are connected as shown in FIGURE 5 15 Intake assemblies will accommodate a third heater power cable that may be used to branch off to another intake assembly This may be useful 1f the intake assemblies are mounted on two or more towers 29 AP200 CO H20 Atmospheric Profile System 30 5 3 3 Power CAUTION FIGURE 5 15 Three intake assemblies with heater cables
99. uction Manual all available at www campbellsci com and e LI 840A COyH O Gas Analyzer Instruction Manual available at www licor com 2 Cautionary Statements WARNING o The AP200 can be damaged by unfiltered air being pulled into the sampling sub system To avoid this each inlet must be capped or have a particulate filter installed before applying power to the system Use care when connecting and disconnecting intake assembly tubes and zero and span tubes see Section 5 2 Plumbing to avoid introducing dust or other contaminates o Do not overtighten the Swagelok fittings on the sampling system or intake assemblies See Appendix B Using Swagelok Fittings for information on proper connection AP200 CO H 0 Atmospheric Profile System o Careful design of the power source for the AP200 should be undertaken to ensure uninterrupted power If needed contact a Campbell Scientific applications engineer for assistance o Retain all spare caps and plugs as these are required when shipping or storing the AP200 system Initial Inspection Overview Upon receipt of the AP200 inspect the packaging and contents for damage File damage claims with the shipping company Model numbers are found on each product On cables the model number is often found at the connection end of the cable Check this information against the enclosed shipping documents to verify the expected products and the correct lengths of cable are included Th
100. uence all the time True BEL Measure tanks but do not set the zero or span Measure tanks and set the zero and span Without Setting Zero and Span If the AP200 is configured with MEASURE TANKS True and AUTO_ZEROSPAN False it will check the zero and CO span but it will not command the IRGA to set them This section gives timing details for this case The AP200 zero span sequence will e Select inlet 10 CO Span omit at least 20 s for equilibration and include 10 s in the average e Select inlet 9 Zero omit at least 30 s for equilibration and include 10 s in the average e Select inlet 1 for at least 10 s This allows the humidity in the tubing and IRGA to equilibrate before restarting the profile sequence As shown in TABLE D 3 this minimum timing adds up to 80 s for the zero span sequence The time for one or more of the steps 1s increased as needed to equal the profile sequence cycle time or a multiple of the cycle D 3 Appendix D Valve Sequence Timing time For example if there are eight levels used the profile cycle time 1s 120 s This means 40 s must be added to the zero span sequence This has been allocated as 10 s extra each for the span and zero and 20 s extra for equilibration on level 1 at the end of the sequence The zero span sequence takes the place of one profile cycle for five six seven or eight levels However if there are four levels used the profile cycle time is only 60 s This 1s
101. ule Front ferrule FIGURE B 2 Front and back Swagelok ferrules TABLE B 3 Dimensions and Part Numbers for Swagelok Ferrules Tubing OD in Swagelok pn front back B 203 1 B 204 1 B 403 1 B 404 1 B 603 1 B 604 1 B 813 1 B 814 1 B 1013 1 B 1014 1 B 3 Appendix B Using Swagelok Fittings Plugs Swagelok plugs are used to plug a fitting when its tube is disconnected It is strongly recommended to plug all fittings to keep them clean Spare plugs may be needed if they become lost or damaged FIGURE B 3 Swagelok plug TABLE B 4 Dimensions and Part Numbers for Swagelok Plugs ra 1 8 26803 1 4 15891 3 8 13712 1 2 17381 Caps Swagelok caps are used to cap the end of tubes when they are disconnected from the fitting It 1s strongly recommended to cap all disconnected tubes to keep them clean Spare caps may be needed 1f they become lost or damaged FIGURE B 4 A Swagelok cap and inserted plug Appendix B Using Swagelok Fittings TABLE B 5 Dimensions and Part Numbers for Tubing OD in 1 8 1 4 3 8 1 4 5 8 Swagelok Caps Swagelok pn CSIpn B 200 C 19219 15831 15547 17335 19496 B 5 Appendix B Using Swagelok Fittings B 6 Appendix C Temperature Profile The AP200 system can measure a temperature profile at up to eight levels with 107 L temperature probes These temperature probes are not part of the AP200 system they must be ordered separ
102. will command the IRGA to perform a zero and span True or whether 1t will merely measure the tanks False It is ignored if MEASURE TANKS is false The default is AUTO ZEROSPAN True CAL_INTERVAL This variable determines how often given as time in minutes the calibration zero span sequence will be run It is ignored if MEASURE TANKS is false The minimum time is the output interval 30 min The maximum time is 1 440 min once per day CAL TIMEOFFSET This variable determines when the calibration zero span sequence is started within the CAL INTERVAL time If CAL TIMEOFFSET is set to zero the calibration sequence will start at the start of the CAL INTERVAL Setting this variable to a non zero value will delay the start of the zero span sequence by the set number of minutes CAL TIMEOFFSET may be set to any value from zero to CAL INTERVAL CO2 SPAN PPM This is the concentration of the CO span tank in ppm If MEASURE_TANKS and AUTO_ZEROSPAN are both TRUE the system will automatically span the IRGA to this value during the zero span sequence This value is also used during a manual CO span operation Any value may be entered for CO2 SPAN PPM but spanning the IRGA will be disabled unless the value is between 100 and 20 000 The factory default is 99 to intentionally disable setting the CO span until the user enters the value for the CO span tank The next two variables control the AP200 automatic power shutdown function If
103. with a brushless DC motor This pump includes a speed control input and a tachometer to measure the actual pumping speed It is mounted in an insulated temperature controlled box inside the AP200 system enclosure The following sections describe the monitored pump operating parameters Pump Inlet Pressure The measured inlet pressure of the pump is reported in public variable pump_press The AP200 sets the value of public variable pump_control to a value between 0 off and 1 full speed to adjust the pump s speed as needed to match the measured pressure to the setpoint pressure PUMP P SETPT PUMP P SETPT is a system configuration variable see Section 5 4 1 System Configuration Variables This pressure setting affects the power required for the pump lower pressure requires more power the possibility of water condensing in the tubing lower pressure helps to prevent condensation and the flow rate lower pressure will increase the flow rate The pump can achieve a maximum of approximately 4 kPa pressure drop from ambient pressure The recommended setting for the pump 1s 35 kPa below ambient pressure The pump module includes two buffer volumes to dampen the pressure fluctuations from the pump The sample flow from the analyzer flows through these volumes in series on the way to the pump The bypass flow from non selected inlet connects directly to the pump Pump Speed The measured pumping speed is reported in public variable pump sp
104. y hand Hold the tube to prevent 1t from rotating while tightening the nut Connect the serial cable Connect the power connector FIGURE 7 2 Installed IRGA in system enclosure AP200 CO H 0 Atmospheric Profile System To remove the IRGA from the AP200 e Disconnect power from the AP200 e Disconnect the power connector from the IRGA Leave the wires connected to the terminal block and pull the terminal block out of the IRGA If the IRGA is to be powered outside the AP200 use the spare terminal block supplied with the IRGA e Disconnect the serial cable from the IRGA e Disconnect the inlet and outlet tubes from the IRGA Hold the tube to prevent 1t from rotating while loosening the knurled nut Pull the tube off the fitting e To keep the AP200 and the IRGA clean connect the IN tube to the OUT tube using the union fitting in the storage pocket in the door of the AP200 system enclosure Plug the IRGA fittings with the green vinyl caps e Undo the Velcro strap and remove the IRGA from the mounting bracket ROAA CE m O ON ON o e 11010 SEL Osk AAA 1 FIGURE 7 3 Components and fittings of IRGA installation 7 4 2 Configuring the IRGA The IRGA is automatically configured by the AP200 program This configuration is sent to the IRGA when the program compiles or if the IRGA fails to respond for five consecutive samples Messages are written to the 47 AP200 CO H 0 Atmospheric Pr

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