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CPEC200 Closed-Path Eddy-Covariance System

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1. seeeeeeeee 26 5 5 1 Sonic Anemometer Azimuth sse 26 5 5 2 CO Span Cylinder Concentration sssn 26 5 5 3 H O Span Dew Point Temperature ccccccceeceeeeeeeeeeeeeeees 26 5 5 4 Sample Intake Flow Rate eee 2 5 5 5 Zero Span Gas Flow Rate seen 2 5 5 6 EC155 Manual Power down cccccccccccccccccceeseseeeessssnneeeeeeeeees 27 Su SAMOA ModE ueniet obama A T actae dui PE 2 5 6 System Control Constants oe etie rores CEPR ERE Pd HS bd neeg 23 5 6 1 JX tomatic Zero Spal sccpereee dest Pet ed bote esee pedea ael eta ieaie 2 5 0 2 Other Syst m C nstaMi aeree eet n e dei ai tuens 28 5 7 CPEC200 Operating MOdES ice tretr te PUR e Pr pns 28 5 0 Verily Proper Operatom ss aide out tain E Eia 29 6 Zero and SDalisssciiiRr esu eS xh uaa a 30 O L InttOdUctlOTl suuin vetusto mtr moI AE pa Ud e UOLUIT uite 30 62 Automatic Zero and SpDalle suene reta bouis essi ele ema impone ants 3l 63 Mangal Zero dnd SD3Ils dicas rodeada btt aptos enlistees 33 634 Onsite Eey pad aeria elastin ashanti belt ste 34 632 Remote LOPPCENNEU zcoedossesiuu etat a a rani 35 7T Maintenance and Troubleshooting 36 Jd Enclose DesStceabio eiie votes tat amicus pU ten Tuo o aess aderat UE 36 T2 BOIS Intake Det once A 36 Z3 eel Vy TOO Sy Cem ae veces daca Mode c Eos 37 TA EC I55 Chemical Bottles pssst b ambe inter ahud acted 37 ME REDA gee a Oe
2. EC sensors EC155 and CSAT3A Mounted on a horizontal round pipe of 3 33 cm 1 31 in outer diameter such as the CM20X crossarm EC100 electronics Mounted within 3 m of the EC sensors The EC100 mounting bracket will accommodate a pipe at any orientation with outer diameter from 2 5 cm to 4 8 cm 1 0 in to 1 9 in CPEC200 enclosure Mounted where it can be accessed easily to retrieve data from the CF cards on the datalogger The CPEC200 enclosure is similar to the ENC16 18 with the same mounting options tower tripod leg or pole CPEC200 pump module Mounted within 3 m of the CPEC200 enclosure The pump module enclosure is similar to the ENC10 12 with the same mounting options tower tripod leg or pole Consult the ENC10 12 ENCI2 14 ENC14 16 ENC16 18 Instruction Manual available at www campbellsci com for details on mounting bracket options The following section illustrates a typical application using a CM110 tripod and CM202 crossarm The CPEC200 enclosure and the CPEC200 pump module are shown with the leg mount options The CM110 tripod and the leg mounting options shown are ideal for a low EC measurement height to minimize wind disturbance 5 1 2 Mount Enclosures Mount the EC100 electronics within 3 m of the EC sensors this measurement corresponds to the length of the cables on the EC155 and the CSAT3A The EC100 should be mounted vertically to prevent water ingress from precipitation Its mounting bracket will
3. Verify the value of Ux Uy Uz and Ts are reasonable Verify the wind direction wnd dir compass is correct Consult the EC155 user manual to diagnose and solve problems with the CSAT3A CPEC200 system There are a few additional variables that must be checked to verify proper operation of the system Batt volt If the battery voltage measured in the CR3000 falls below 10 0 V the CPEC200 system will shut down the EC155 until the supply voltage rises above 11 0 V Pump tmpr okay f must be true If it is false it is an indication that the pump is outside its operational temperature range 2 C to 55 C Pump flow must be close to the setpoint pump flow set pt If the CPEC200 was not configured with the optional valve module the installation is now complete If the valve module is installed use the zero span capability of the CPEC200 as described in Section 6 Zero and Span 6 Zero and Span 6 1 Introduction The EC155 should be zeroed and spanned periodically to maintain its accuracy There are three ways accomplish this l 30 The EC155 can be zeroed and spanned independently of the CPEC200 system per the instructions in the EC155 manual This option can zero and span both CO and H20 This is the only option if the CPEC200 was configured without the optional valve module The optional valve module allows the EC155 zero and span to be performed manually at the field site Although the CO and H5O zero and the CO span m
4. 8 W that turns on if the pump temperature falls below 2 C If the CPEC200 is started at cold temperature it may take up to 50 minutes 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 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 outlet of the pump connects the Exhaust fitting on the bottom of the pump module enclosure This fitting has a screen to prevent insects or debris from entering when the pump is off 9 4 3 CPEC200 Closed Path Eddy Covariance System Specifications System Operating temperature Input voltage Power System enclosure Dimensions Weight basic system CR3000 CFM100 NL115 Three valve module Six valve module Pump module Cable length Inlet connection Pressure sensor range Pumping speed Dimensions Weight w out mounting Valve module Flow rate Inlets Three valve module Six valve module Outlets Connections Dimensions Weight Three valve module Six valve module 30 to 50 C 10 5 to 16 0 Vdc 12 W typical 35 W max at cold startup 52 1 x 44 5 x 29 7 cm 20 5 x 17 5 x 11 7 in 11 6 kg 25 5 Ib 1 6 kg 3 7 Ib 0 2 kg 0 4 Ib 1 5 kg 3 3 Ib 1 9 kg 4 2 Ib 3 0 m 10 ft 3 8 in Swagelok 15 to 115 kPa 3 to 9 LPM automatically controlle
5. Although the CR3000 is a required component the CPEC200 can be purchased without the CR3000 but the user must supply the CR3000 low profile base option CPEC200 Closed Path Eddy Covariance System CAMPBELL SCIENTIFIC FIGURE 4 5 CR3000 datalogger 4 1 2 2 NL115 or CFM100 Storage Module The datalogger saves data onto a CompactFlash CF memory card FIGURE 4 7 via an optional NL115 or CFM100 card module FIGURE 4 6 Either module will provide data storage The NL115 has the added capabilities provided by an Ethernet interface FIGURE 4 6 NL 115 left and CFM100 right The CPEC200 can be ordered with either the NL115 or the CFM100 module factory installed If the CPEC200 is ordered without a storage module the user must provide one The CF card FIGURE 4 7 for the storage module can be ordered separately from www campbellsci com 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 also available at www campbellsci com Requremen Orven SSO Souwons CFV 2GB TSI 3522 1433 FIGURE 4 7 CFMC2G 2GB CompactFlash memory card CPEC200 Closed Path Eddy Covariance System 4 1 2 3 CPEC200 Valve Module The optional valve module is housed in the CPEC200 enclosure and is used to automate zero and CO span checks and automatically perform a field zero and field CO
6. to be cleaned To evaluate the cleanliness of the windows monitor the CO signal and the H5O signal These will have a value of approximately 1 0 for clean windows but will decrease as the windows become dirty The EC155 is calibrated for a range of signal levels down to 0 80 Clean the windows as instructed in the EC155 user manual before the CO and H O signals reach 0 80 7 4 EC155 Chemical Bottles Repair If more than one year has passed since replacing the desiccant scrubber or if zero and span readings have drifted excessively the desiccant scrubber bottles pn 26511 within the EC155 analyzer head should be replaced as detailed in the EC155 user manual The CPEC200 is designed to give years of trouble free service with reasonable care However if factory repair is needed contact a Campbell Scientific applications engineer to obtain an RMA number An RMA number and product safety documents are required prior to any repair shipments being accepted at Campbell Scientific as detailed in the Assistance section at the beginning of this document Consult with a Campbell Scientific applications engineer to determine which parts or assemblies should be sent for repair If the system enclosure is 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 37 CPEC200 Closed Path Eddy Covariance System 38 Appendix A CPEC200 Diagnostics The P
7. 1 2 7 Enclosure Mounting Options The CPEC200 system enclosure and the CPEC200 pump module can be configured with one of several mounting options These enclosures are 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 3 8 cm 1 5 in to 4 8cm 1 9 in diameter Tripod leg CM106 or CM106K tripod only Large pole 10 2 cm 4 0 in to 25 4 cm 10 0 in diameter No mounting bracket Consult the ENC10 12 ENCI2 14 ENC14 16 ENC16 18 Instruction Manual available at www campbellsci com for details on mounting bracket options 4 1 3 Common Accessories There are several items that may be required to complete the installation but are not included in the CPEC200 Some of the more common accessories are System Power Cable Two power cables required for the CPEC200 one for the main CPEC200 system and one for the EC100 electronics CPEC200 Closed Path Eddy Covariance System NOTE NOTE 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 is cut to the specified length and the end finished for easy installation SDM Cable An SDM communication cable is required to connect the EC100 to the CPEC200 system enclosure The preferred SDM cable is CABLE4CBL L This cable consists of 4 conductors with a shield and drain wire and a
8. B 6 Appendix C Output Variables The CPEC200 program has four output tables ts data Flux onlincal and sys err log The output tables are saved to a compact flash card which is inserted into a card module such as the CFM100 or NL115 The time it takes to fill a card will depend on the size of card used A two gigabyte card should last between one and two months Following are brief descriptions of output tables e The ts data table includes raw time series data from the sensors It also includes the raw diagnostic words from the sensors A data record is stored to this table every time the main scan is executed Data in this table may be useful for post processing and analysis as well as troubleshooting e The Flux table consists of calculated covariances and fluxes along with other statistics It also parses out diagnostic words into individual diagnostic flags or bits The table is output at an interval defined by the constant OUTPUT INTERVAL The default interval is 30 minutes e The onlincal table holds data pertinent to the automatic zero span checks and zero spans It is stored each time an automatic zero span check and zero span is performed The sys err log table has only one data output an error message string This output occurs only when an error condition is found or when the status of an error condition changes C 1 Appendix C Output Variables Campbell Scientific Companies Campbell Scientific Inc CSI
9. Diagnostics Check the measured pump temperature pump tmpr and compare 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 and it 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 Bit 3 Pump flow is not at the setpoint Bit 3 of system diag indicates the pump flow is not at the setpoint To confirm the problem compare the value of pump flow to pump flow set pt They should match to within 0 5 LPM Bit 4 Valve temperature is outside its operating range Bit 4 of system diag indicates the valve temperature is outside its operating range This triggers the CPEC200 to shut down the valves to protect them from possible damage Check the measured valve temperature valve tmpr and compare it to the operating range 0 C to 60 C The valve module has a heater that turns on if valve tmpr falls below 2 C and it has a fan that turns on if valve tmpr rises above 50 C The fan will stay on until the valve temperature falls below 48 C Bit 5 Valve flow is not at the setpoint Bit 5 of system diag indicates the valve flow is not at the setpoint To confirm the problem compare the value of valve flow to valve flow set pt They should match to within 0 5 LPM Bit 6 IRGA diagnostic Bit 6 of system diag indicates there is a problem with the EC155 To confirm the problem check the value of diag irga and troubleshoo
10. EC155 The CPEC200 program adjusts public variable valve flow duty cycle between 0 closed and 1 fully open as needed for the measured flow valve flow to reach the desired flow valve flow set pt The default value for valve flow set pt is 1 0 LPM This flow 1s adequate for lower measurement heights allowing a shorter tube between the valve module and the EC155 but a higher flow rate may be required with long zero span delivery tubes used on tall towers The proportional valve is opened fully during an H5O span operation to prevent pressurizing the dew point generator 13 CPEC200 Closed Path Eddy Covariance System 14 The CPEC200 valve module includes a heater and a fan to keep the valves within their operating range of 0 C to 60 C The valve heater turns on off at 2 C The valve fan turns on at 50 C and stays on until the valve temperature drops to 48 C To conserve power temperature control is active just prior to and during the time when valves are in use If the valves cannot be maintained within the temperature range the valves are disabled The valve module temperature control can be manually activated so that manual zero span can be performed by the station operator on site or remotely If starting from the minimum ambient temperature 30 C the valves may take as much as 15 min to warm up to the operating range of 0 C to 60 C 4 2 4 Pump Module The CPEC200 pump module pulls air through the system and exhausts it throu
11. air to flow to the EC155 This step is used to measure the EC155 response to zero CPEC200 Closed Path Eddy Covariance System air before setting the EC155 zero in the following step The duration of this step is determined by constant SECONDS ON SITE 3a with a default of 60 s In step five the pump is off and the Zero valve is open similar to step three In this step the CPEC200 sends the command to the EC155 to set its internal parameters to read zero H5O and zero CO See the EC155 manual for details The duration of this step is determined by constant SECONDS ON SITE 3b with a default of 10 s In step six the CPEC200 sets the EC155 CO span It opens the CO2 Span 1 valve to allow the CO span gas to flow to the EC155 It measures the EC155 response to CO span gas after setting the zero and before setting the EC155 CO span in the following step It then sends the command to the EC155 to set its internal parameters to match its CO measurement to CO2 span gas See the EC155 manual for details The duration of this step 1s determined by constant SECONDS ON SITE 4b with a default of 60 s Steps seven eight and nine measure the EC155 s response to additional CO span tanks These steps are not normally recommended but they allow the user to monitor the performance of the EC155 at a range of CO concentrations The duration of these steps is determined by constants SECONDS ON SITE 5 SECONDS ON SITE 6 and SECONDS ON SITE 7 with a
12. ambient pressure is different for the keypad and LoggerNet these instructions are given in each section 33 CPEC200 Closed Path Eddy Covariance System 34 Manual zero span requires that user supplied zero and span tanks be connected to the CPEC200 as discussed in Section 5 2 2 Zero Span If an HO span is to be done see Section 4 2 3 Valve Module for instructions on connecting the dew point generator to the CPEC200 valve module 6 3 1 Onsite Keypad This section gives instructions on how to do a manual zero span onsite using the CR3000 keypad Section 6 3 2 Remote LoggerNet describes a remote zero span using LoggerNet It is also possible to use the LoggerNet interface onsite The instructions below will first direct the user to make measurements of H5O span CO span and zero gas followed by executing the zero CO span and H20 span Some of the steps are marked H20 Skip these steps if not doing an H5O span 1 Press Enter twice on the CR3000 keypad to get to the System Control menu Scroll to Prfrm Field H2O Spn and press Enter Select Valve Tmpr Ctrl Verify that the valve is within normal operating temperature range by checking that Vive Tmpr OK is set to true or 1 If it is set to false or 0 refer to Section 7 Maintenance and Troubleshooting Press Escape on the keypad to return to the Prfrm Field Zero menu 2 Select Field H2O Span under the Prfrm Field H2O Spn menu Select Mode highlight Sample pump of
13. default of 0 s disabled for each Step ten is reserved for future use It has a default of 0 s disabled Step eleven returns the CPEC200 system to the normal operation measuring EC fluxes In this mode the pump is on with its pumping speed automatically controlled to give a volumetric flow rate pump flow equal to the user defined setpoint pump flow set pt AII valves on the valve module are closed 6 3 Manual Zero and Span Manual zero and span may be done onsite using either the CR3000 keypad or a user supplied PC connected to the CPEC200 via the LoggerNet Connect Client If a remote communication link is set up to the CPEC200 the LoggerNet option may be performed remotely The keypad approach is detailed in Section 6 3 1 Onsite Keypad and the LoggerNet approach is detailed in Section 6 3 2 Remote LoggerNet As discussed in Section 4 2 3 Valve Module the CPEC200 valve module temperature is actively controlled but this temperature control is disabled by default to conserve power It is automatically enabled for automatic zero span but it must be manually enabled for manual zero span As the process for enabling the valve temperature control is different for the keypad and LoggerNet these instructions are given in each section The CPEC200 controls the flow rate during the zero span process as discussed in Section 4 2 3 Valve Module This flow control requires the ambient pressure to be measured As the process for measuring
14. ee nee 37 Appendices A CPEC2Z00 DIagnoSll6S oic erera etur tes A 1 B Using Swagelok Fittings B 1 Bl Assemb sa seg tase a AINE E MEUM B 1 B 2 Common Replacement Pts oontra Geste B 2 G Output Variables 2 onsite DE ea V ESVES RE EX ok cR RR C 1 Figures 4 1 EC155 closed path CO H O gas analyzer sss 2 4 2 ECI100 electronics THOGQU IO 4 ect oca Pozo tu deba a a De dd bu Rees 3 4 3 CPEC200 system enclosure ccccccccccccccecceceeeeeeeeeeeeeeeeseeeeeeeeeeeeees 3 4 4 CPBRCZO00 pump mod le 5 eer ERR Geta ea eet teta ea ER Exe 4 4 5 OCR3S000 048talOP S6E i teh ette o ns keen hat ets a Eb ode 5 Table of Contents 4 6 NLII15 left and CFMIOO right 5 4 7 CFMC2G 2GB CompactFlash memory card sssssse D 4 5 CPBC2D00 valve modul eriei 6 4 9 CSAT3A sonic anemometer head Fj 4 10 17752 USB memory card reader writer sss 9 LE Intake tilter oL BO D3955 ees obtutu a told dat eiae tan deaad 10 25127 Sne le desiccant PACK as seensssuedte ivan isset DOE P Let bruUE 10 4 13 Humidity indicator card sssssseeeeeeenenennnn 11 ASIA ECIS gas analy Zl ian R a E EA 11 4 15 CSAT3A sonic anemometer head sse 12 5 CPEC200 enclosure pump module and EC100 mounted to legs of C MEDPOSSEPIOS tripod caeso eite nnne ea Piet Deere tes Cures 17 5 2 CM210O mounting bracket on a
15. span on a user defined interval Field H O span requires a dew point generator and cannot be automated because the dew point generator is a laboratory instrument Therefore H2O spans must be performed manually The CPEC200 valve module is available in two versions one with three valves pn 27559 and another with six valves pn 26578 The valve module is normally ordered as a factory installed option of the CPEC200 but the module can also be ordered separately and installed by the user amd oo d PI L4 e mt Ou eL Ox e Qs O e O FIGURE 4 8 CPEC200 valve module 4 1 2 4 CSAT3A Sonic Anemometer Head NOTE The CSAT3A is a 3D sonic anemometer sensor head It shares integrated electronics EC100 electronics with the EC155 gas analyzer For detailed information and specifications see the CSAT3 manual The CSAT3 has its own electronics box whereas the CSAT3A shares the EC100 Electronics with the EC155 gas analyzer The measurement specifications for the CSAT3 and CSAT3A are the same CPEC200 Closed Path Eddy Covariance System Ww x FIGURE 4 9 CSATS3A sonic anemometer head 4 1 2 5 Pressure Sensor The EC100 always includes the EC100 basic barometer but it may be ordered with the optional EC100 enhanced barometer 4 1 2 6 Carrying Cases The EC155 and the CSAT3A may be ordered with optional carrying cases If the carrying cases are not ordered the sensors are shipped in cardboard boxes 4
16. the gas takes is from the tanks through the valve module to the EC155 analyzer and out the end of the EC155 intake The CPEC200 valve module has a proportional control valve to actively control the flow of zero and span gas This flow rate can be changed by changing the value of public variable valve flow set pt The default for zero and span gas flow is 1 0 LPM but higher zero span flow rates may be required with long zero span delivery tubes use on tall tower installations The maximum zero span flow rate is 5 0 LPM The flow rate is set such that the sample cell zero span concentration reaches equilibrium in less than 60 seconds 9 5 6 EC155 Manual Power down Variable ec155 off flg allows the user to manually power down the EC155 5 5 7 Sampling Mode Variable mode allows the user to control the sampling mode of the CPEC200 5 6 System Control Constants The CPEC200 uses both constants and variables to control the behavior of the system Constants are used for parameters that must be determined when the program is compiled and variables are used otherwise see Section 5 4 Configure the Program 5 6 1 Automatic Zero Span The CPEC200 may be configured to sample periodically from zero and CO span cylinders requires an optional three or six valve module It may also be configured to set the EC155 zero and CO span recommended or to simply record the EC155 s response to zero air and CO span gas The default timing for automati
17. 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 either emailed to repair campbellsci com or f
18. 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 finger tight 3 While holding the fitting body steady tighten the nut slightly with a wrench B 2 Common Replacement Parts Tubing Campbell Scientific can provide several types and sizes of plastic tubing as shown in TABLE B 1 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 in ID in Length ft zz M 1300 14 017 50 Black HDPE Aluminum jacket overlapped layer limits 15703 aluminum tape diffusion best 19164 ethylene for sample copolymer liner tubes 26506 06 LLDPE A Black linear low More flexible density than HDPE d polyethylene Black High Required for density larger polyethylene diameter Appendix B Using Swagelok Fittings Tubing inserts 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 Cin FIGURE B 1 Swagelok insert TABLE B 2 Dimensions and part numbers for Swagelok inserts Tubing OD in Tubing ID in Swagelok pn CSI pn 1 4 1 8 B 405 2 15834 1 4 B 405 170 15830 3 8 1
19. 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 CPEC200 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 Modifications to the CPEC200 program for example to measure additional sensors are not recommended without first consulting a Campbell Scientific applications engineer 5 5 System Configuration Variables Several special variables are used to configure the CPEC200 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 may be edited at any time When a system configuration variable is changed the CPEC200 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 re
20. 101CHRISTINE BELEN NEW a DESI PAK SPECIFICATION MIL D 3464 TYPE amp Jl TIVATION TIME IN BAG 16 HOURS AT 250 F REAC DESICCANT CONTE NTS PACKAG ACTIVATED 4 Pris m USE BAGGED FOR UNITS alls DEHUMIDIFICATION FIGURE 4 12 Single desiccant pack Humidity Indicator Card The replacement humidity indicator card FIGURE 4 13 provides a visual reference of humidity level inside the enclosure The replacement is pn 28878 CPEC200 Closed Path Eddy Covariance System HUMIDITY INDICATOR MS20003 2 EXAMINE 28 ITEM 2a IF PINK EI EE CHANGE amp DESICCANT Su JF PINK ES 58 WARNING Em IF PINK 25 DISCARD IF ues OVERRUN AVOID METAL CONTACT FIGURE 4 13 Humidity indicator card EC155 Replacement Chemical Bottles The EC155 has two small bottles filled with chemicals to remove CO and water vapor from the inside of the sensor head If replacement bottles are needed two bottles are included with pn 26511 4 2 Theory of Operation The CPEC200 is used for long term monitoring of atmosphere biosphere exchanges of carbon dioxide water vapor heat and momentum This complete turn key system includes a closed path gas analyzer EC155 a sonic anemometer head CSAT3A datalogger CR3000 sample pump and an optional valve module for automated zero and span 4 2 1 EC155 Gas Analyzer The EC155 is Campbell Scientific s in situ closed path mid in
21. 2 12 0 Carrying C ases coussin ent onam iE 7 4 1 2 7 Enclosure Mounting Options seen 7 4 1 3 Common ACCESSONES a doeet tua Uc aea Ra EE EET 7 AVA Support SoftWare ei ponies es cs m ieee 9 4 1 5 Replacement Partsu iet deo n eee d 10 227 TRON OL ODGEAL OB iann est cee etti sel er e Poet ees 11 42 1 ECIS GIANI yE a aS 11 4 2 2 CSAT3A Sonic Anemometer Head suueuee 12 2 2 5 alveMOOHU G inei opes oan bi UE pute ER eae 12 AZA Pump Module e anth Aet uten 14 4 3 SSDOCIHCBLOTIS s eec eae RI UN RU ERI RM ieu E 15 cli eem 15 5A SNMPOUTILIIS S dec petes iebrdu deuten repos Bele stabat es a TA 16 SA GSHDDOL SU UC MINS oo oneseor eR vetro ce ele ibo E tanus iuto o edis 16 S2 J Niount BHelOSUteSauecateeiter mentes ted o pte ee es AS 16 5 L3 Instal BC SCHSOESureete deeem bet a eed bet c tnm 17 22r SUMAN INO Lo one e buttr med bet tectus eed etes irai ber E an im 19 29 Pomp Modul cedre dope etui didus 19 3 2 25 LON Paan aena d tede indeed tedcduecuin edet du e decim 20 25 AMITITIB eee ee een cen een tee Reenter tute ibi eMail eee re were nearer 21 21 Ground Connections cuneis inl en o d dp beiden 2 2 22 EC Sensor Caples d edendo p e din doped die eds 22 Table of Contents 5 3 9 Pump Module Cable stet oae te td eto eds 25 5 2 4 APPI POWE nueva ea aede ipit aes eee ee er 25 5 4 Configure the Program oerien n 25 5 5 System Configuration Variables
22. 200 system enclosure are requiring frequent replacement check that the feedthrough cap is properly installed see Section 5 3 4 Apply Power In very humid conditions it may be helpful to seal the cable feedthrough with plumber s putty as described in Section 5 3 4 Apply Power 7 2 EC155 Intake Filter 36 Over time the EC155 s intake filter will become plugged with particulates from the air causing an increased pressure drop The EC155 has a differential pressure sensor with a 7 kPa range to measure the sample cell pressure with 8 NOTE CPEC200 Closed Path Eddy Covariance System respect to ambient pressure As the intake filter plugs over time the differential pressure will decrease from approximately 3 kPa typical for a clean filter at 7 LPM If the differential pressure reaches 7 kPa the data will no longer be valid It is important to monitor the differential pressure and replace the filter before this limit 1s reached The default replacement filter is pn 26072 It is a 2 5 cm 1 0 in diameter sintered stainless steel disk filter of 20 um pore size with a molded Santoprene shell An alternative 40 um filter pn 28689 is also available Choose the 40 um filter if the default 20 um filter clogs long before the EC155 optical windows become dirty See the EC155 manual for details on replacing the intake filter 7 3 EC155 Windows Over time the optical windows of the EC155 will become dirty and will need
23. 4 9845 1 2 3 8 17380 5 8 1 2 19495 B 3 Appendix B Using Swagelok Fittings 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 D Back ferrule 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 CSI pn 1 set B 403 1 B 404 1 15890 N A B 1013 1 B 1014 1 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 1 8 26803 1 4 15891 3 8 13712 1 2 17381 B 5 Appendix B Using Swagelok Fittings Caps Swagelok caps are used to cap the end of tubes when they are disconnected from the fitting It is strongly recommended to cap all disconnected tubes to keep them clean Spare caps may be needed if they become lost or damaged FIGURE B 4 A Swagelok cap TABLE B 5 Dimensions and part numbers for Swagelok caps Tubing OD in Swagelok pn CSI pn 1 8 B 200 C 19219 1 4 15831 3 8 15547 1 2 17335 5 8 19496
24. 5 days 16 GB 289 days EC100 SDM ADDR 1 SDM address for EC100 BANDWIDTH Bandwidth 20 20 Hz 3 SDM PER 3 SDM clock speed l 2 5 7 CPEC200 Operating Modes The CPEC200 has nine modes of operation listed in TABLE 5 4 as determined by public variable mode If mode 1 EC on auto zro spn the CPEC200 system will periodically suspend EC measurements to run a zero span sequence The details of the zero span sequence are determined by the system control constants Modes 2 through 8 are used while doing manual zero and spans See Section 6 3 Manual Zero and Span Mode 9 allows the CPEC200 to simply sample ambient air continuously without doing automatic zero spans 28 CPEC200 Closed Path Eddy Covariance System The first time the CR3000 compiles the CPEC200 program it will run in mode 9 EC off auto zro spn EC sampling with no automatic zero span The user may change the value of mode in real time using either the keypad or through Loggernet Any changes to the mode variable will be automatically saved in non volatile memory TABLE 5 4 CPEC200 Modes of Operation CR3000 Display Name Mode Description Automatic zero span checks and zero spans are enabled Sampling timing and sequence will follow the user entered timing constants EC on auto zro spn Sample pump is disabled This mode may be used to get a reading of ambient pressure from the sample cell pressure measurement Sample pump off This mode turn
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26. CO2 span flg from false to true Wait a few moments and the value of CO should be reset to approximately the CO span gas concentration 10 Change mode back to 1 to enable automatic zero spans EC on auto zro spn or 9 to sample ambient air continuously without zero spans EC off auto Zro spn 7 Maintenance and Troubleshooting Most of the basic diagnostic and troubleshooting issues for the CPEC200 are covered in Appendix A CPEC200 Diagnostics This section provides additional detail on some issues that may arise with hardware components 7 1 Enclosure Desiccant CAUTION Check the humidity indicator card in the mesh pocket in the CPEC200 system enclosure door and the EC100 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 The replacement desiccant pack is the 4905 Single 4 Unit Silica Desiccant Bag which can be purchased in quantities of 20 as pn 6714 The replacement humidity indicator card 1s pn 28878 See Section 4 1 5 Replacement Parts for more detail If the desiccant packs in the CPEC
27. I V IINVIA NOILONALSNI CPEC200 Closed Path Eddy Covariance System 1 13 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 is 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 services performed by Campbell such as programming
28. Module Instruction Manual Application Note 3SM F PC CF Card Information LoggerNet Instruction Manual Version 4 1 ENCIO I2 ENCI2 I4 ENC14 16 ENC16 18 Instruction Manual CM106 Tripod Instruction Manual Tripod Installation Manual Models CM110 CM115 CM120 CSAT3 Three Dimensional Sonic Anemometer NOTE This user manual applies specifically to version 1 3 of the CPEC200 CRBasic program 2 Cautionary Statements e WARNING o Do not connect or disconnect the EC155 gas analyzer head or CSAT3A sonic anemometer head from the EC100 electronics while the EC100 is powered Doing so can result in unpredictable performance of the system or damage to the instrument head o Grounding electrical components in the measurement system is critical Proper earth chassis grounding will ensure maximum electrostatic discharge ESD protection and higher measurement accuracy CPEC200 Closed Path Eddy Covariance System o Use care when connecting and disconnecting tube fittings to avoid introducing dust or other contaminants o Do not overtighten the tube fittings Consult Appendix B Using Swagelok Fittings for information on proper connection o The CPEC200 power source should be designed thoughtfully 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 CPEC200 system Initial Inspection Upon receipt
29. SAT3A Cable FIGURE 5 7 EC155 electrical connections mounting hardware not shown 22 NOTE NOTE CPEC200 Closed Path Eddy Covariance System Wire the SDM communications cable CABLE4CBL L between the EC100 and the CPEC200 enclosure as shown in FIGURE 5 8 FIGURE 5 9 and FIGURE 5 10 TABLE 5 1 shows the color scheme of the SDM wires TABLE 5 1 SDM Wiring SDM Data SDM CI SDM CI SDM Clock SDM C2 SDM Enable Red SDM C3 Digital Ground Ground Shield Ground To bring cables into the CPEC200 enclosure remove the cap from the cable feedthrough by loosening the thumbscrew and twisting the cap as you pull it off To connect a wire to the DIN rail terminal blocks of the CPEC200 enclosure insert a small screwdriver into the square hole to open the spring loaded contacts Insert the wire into the corresponding round hole and then remove the screwdriver Gently tug the wire to confirm it 1s secure Ensure the CPEC200 enclosure is not powered and wire the power cable CABLEPCBL L from the EC100 electronics to the CPEC200 enclosure as shown in FIGURE 5 8 FIGURE 5 9 and FIGURE 5 10 Secure the SDM and power cables in the EC100 with a cable tie FIGURE 5 8 Wiring of power and communications 23 CPEC200 Closed Path Eddy Covariance System GAS SOIC Stabus POWER EC100 Electronics Module for CO amp H 0 Gas Analyzer with 3 D Sonic Anemometer EC100 Power EC100 SDM Cable Cable FIGURE 5 9 Wirin
30. Span inlet The dew point generator s internal pump can push flow into the valve module even when the H5O Span valve is not selected minimizing errors caused by pressurization inside the dew point generator When the H O Span valve is selected the dewpoint generator pushes moist air through the valve module to the EC155 The CPEC200 pushes the zero span flow backward through the EC155 sample cell and exhausts it through the intake tube to the atmosphere Flow through the intake tube causes the sample cell pressure to rise slightly above ambient pressure The CPEC200 infers the flow rate from this pressure rise The EC155 has a differential pressure sensor to measure this pressure rise directly but its accuracy is affected by a small offset drift The accuracy of this differential pressure measurement can be improved by stopping all flow through the EC155 allowing the pressure in the sample cell to equilibrate with ambient pressure and measuring the differential pressure offset This offset is then subtracted from subsequent measurements used to control the flow Because the pressure sensor offset can change over time this offset is measured at the beginning of every zero span cycle This step requires at least 10 s to complete 5 s for the pressure to equilibrate and 5 s to average and store the differential pressure measurement The CPEC200 valve module has a proportional control valve to actively control the flow of zero and span gas to the
31. accommodate a horizontal vertical or angled pipe from 2 5 cm to 4 8 cm 1 0 in to 1 9 in diameter See the EC155 user manual for details on configuring the EC100 mounting bracket The EC100 electronics are shown mounted on one leg of a CM110 tripod in FIGURE 5 1 Mount the CPEC200 enclosure and the CPEC200 pump module within 3 m distance the length of the pump module cable The enclosure and pump module are shown mounted back to back on the leg of a CM110 tripod in FIGURE 5 1 but they may also be mounted on a vertical pipe triangular tower or large diameter pole depending on the site requirements and the mounting options ordered CPEC200 Closed Path Eddy Covariance System CPEC200 Enclosure EC100 i Electronics Pump Module FIGURE 5 1 CPEC200 enclosure pump module and EC 100 mounted to legs of CM110 series tripod For the EC100 and the system enclosure 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 Install EC Sensors Install a horizontal mounting crossarm at the height desired for the EC measurement This crossarm must be within 15 degrees of horizontal to level the sonic anemometer Point the crossarm into the predominant wind direction to minimize wind disturbance caused by
32. an flg Verify that CO2 span gas has the correct concentration of the span gas being used Verify that valve tmpr okay f is set to true 1 Change mode to 2 to turn the sample pump off Wait at least 10 s before you proceed to the next step This will allow the CPEC200 to measure the offset in the differential pressure sensor Change mode to 4 so that CO span gas will start to flow through the EC155 To change the mode click on the current value enter in the new value of 4 and press Enter Monitor CO2 umolemol and watch that it reaches equilibrium If the tube length between the cylinder and the EC155 is long it may take a few minutes for the measurement to stabilize Once stable record the value of CO2 Change mode to 3 so that zero gas will start to flow from the zero gas cylinder to the EC155 Monitor CO2 umolemol and H20 mmol mol until they reach equilibrium It could take several 35 CPEC200 Closed Path Eddy Covariance System minutes for H2O to reach equilibrium Once equilibrium is achieved record the displayed values of CO2 and H20 8 While mode is still 3 change the value of do zero flg from false to true Do this by clicking on the field typing in true and pressing enter or by double clicking on the value which will toggle it to true Wait a few moments and the values of CO2 and H2O will reset to approximately 0 9 Change mode back to 4 Wait for CO2 to reach equilibrium Change the value of do
33. ation time after the zero or CO span cylinder is selected Refer to Appendix B Using Swagelok Fittings for information on installing and replacing Swagelok fittings Flow meters and needle valves are not needed because the CPEC200 valve module has a proportional control valve to actively control the flow of zero and span gas to the EC155 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 NOTE NOTE 5 3 Wiring CPEC200 Closed Path Eddy Covariance System When inlets are not in use replace the Swagelok plug to keep the system clean Connect the valve module s Analyzer outlet to the Zero Span fitting on back of the EC155 analyzer Similar tubing pn 15702 or pre swaged tube assembly pn 21823 L is recommended for this connection The length of this tube should also be minimized to reduce equilibration time If the CPEC200 has been configured with the six valve module additional CO span cylinders may be connected to the additional CO Span inlets on the valve module Open the shut off valves on the cylinders and set the pressure regulators for 10 t 5 psig delivery pressure If you inadvertently adjust the pressure too high you may need to slightly loosen the tube fitting to bleed off the excess pressure Retighten the fitting when the prope
34. axed 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 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 Mis SVE OCIUICCION ttc c UE 1 2 Cautionary Statements e 1 3 Initial IRnSDeCcUOL iicet quaii re o panos aniio 2 4 OVvervie W e wE0 E EE 8E 2 4 DY SCCM COMPOS HS anas tust om entactsse tue O I OB denen 2 AN Ne Sundatd COompobobts o pateat e a rec d erred 2 AELE ICD GodsJABAly ZO eae teat on dido 2 KEL oBCLTOOCBIGCLIEOTHCS ode reed te nto ons 3 Tops CPRC200 BBClOSUELO ee erede netto sata 3 AAA CPBCGC200 Pump MOCUIG icta ret e ente as 4 2 2 Optional C oOmpobeHbs osea gredi pedo 4 ALAL R3000 DatalOg gef ito t EE Ee veda dtt 4 4 1 2 2 NL115 or CFM100 Storage Module 5 A235 CPBC200sValve MoGOUles odeciocisseu e I D dos neue 6 4 1 2 4 CSAT3A Sonic Anemometer Head 6 44 75 Pressure CNG OR eireag bium nd ee eect 7
35. ay be performed remotely the H2O span requires the dewpoint generator to be brought to the field site Further details for this option are given in Section 6 3 Manual Zero and Span The EC155 zero and CO span may be performed automatically by the CPEC200 system This requires the CPEC200 be configured with the optional valve module This option can zero both CO and H5O but it CPEC200 Closed Path Eddy Covariance System can span only CO Further details for this option are given in Section 6 2 Automatic Zero and Span See Sections 5 2 2 Zero Span for details on plumbing connections to zero and span the EC155 while installed in the CPEC200 The following sections give details on configuring the CPEC200 for either automatic or manual zero and span In addition to identifying the most appropriate use of manual versus automatic and remote versus onsite calibration there is one additional option to consider whether to simply monitor the zero span or to set the zero span Monitoring the zero span allows the user to track the performance of the EC155 apply gain and offset corrections in post processing and decide when to actually set the zero span Setting the zero span involves sending commands to the EC155 to update its internal zero span parameters Campbell recommends setting the zero span in the EC155 as this will maintain better accuracy than applying corrections in post processing See the EC155 user manual for details The rec
36. back as you slide the cap on and rotate the cap to minimize the space around the cables Tighten the thumbscrew to further relieve strain on the cable This will also minimize air infiltration and extend the life of the enclosure desiccant packs In very humid conditions it may be helpful to seal the cable feedthrough with plumber s putty The CPEC200 stores energy in a capacitor to provide backup power in the event power is 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 powered from the datalogger without consulting a Campbell Scientific applications engineer 5 4 Configure the Program A CR3000 datalogger program Cpec200 vx x cr3 is included with the CPEC200 system If the CPEC200 was ordered with the CR3000 factory installed the program is simultaneously installed A copy of the program is 25 CPEC200 Closed Path Eddy Covariance System NOTE found on the CPEC Support CD pn 26857 or can be downloaded from www campbellsci com The CPEC200 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 Constants are most easily modified using the CRBasic Editor
37. c zero span is once per day at midnight The CPEC200 will measure CO span measure and set the zero and remeasure and set the CO span The period to check or set the zero and CO2 span can be as frequent as once an hour to as long as once a day default and 1s controlled by the constant ZERO SPAN INTERVAL 27 CPEC200 Closed Path Eddy Covariance System To enable disable a specific function the user must change the value of several constants in the program to either true or false These constants are located in the beginning of the program and listed in TABLE 5 2 TABLE 5 2 Configurable Constants in CPEC200 Automatic Zero Span Constant Default Comment Value CHECK ZERO SET ZERO CHECK SPAN SET SPAN I CHECK SPAN 2 CHECK SPAN 3 CHECK SPAN 4 ZERO SPAN INTERVAL OFFSET Number of hours after midnight to start the zero span interval 0 through 24 hrs resolution is 1 hr ZERO SPAN INTERVAL 24 Number of hours between zero span minimum time 1 hr maximum time 24 hrs resolution is 1 hr 5 6 2 Other System Constants There are several other constants that control the CPEC200 system behavior In most applications it 1s not necessary to change the default value TABLE 5 3 Other System Constants Constant Default Comment Value OUTPUT INTERVAL Online flux data output interval in minutes NUM DAY CPU Number of days of data to store on the CPU Y 3 NUM DAY CRD 5 Number of days of data to store on the CRD 2 GB 3
38. cally reads data stored on CompactFlash cards but it can read many different types of memory cards DET z A a ess EN i i os SN R d P d me T iE NA S N p FIGURE 4 10 17752 USB memory card reader writer 4 1 4 Support Software There are several software products available for interfacing a PC to the CPEC200 s datalogger PC200W PC200W 1s a free starter software package that provides basic tools such as clock set program download monitor data retrieve data etc 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 display 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 is 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 enab
39. d at the set point typically 7 LPM 35 6 x 29 2 x 13 5 cm 14 0 x 11 5 x 5 3 in 5 4 kg 11 8 Ib to 5 LPM automatically controlled at the set point typically 1 LPM Zero CO span and H5O span Zero CO spans 1 through 4 and H5O span Analyzer and H5O bypass 1 4 in Swagelok 14 0 x 12 7 x 14 0 cm 5 5 x 5 0 x 5 5 in 1 5 kg 3 3 Ib 1 9 kg 4 2 Ib EC155 and CSAT3A see the user manual C155 CO and H O Closed path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer Installation The following tools are required to install the CPEC200 system in the field Additional tools may be required for a user supplied tripod or tower Adjustable wrench 9 16 in open end wrench 1 2 in open end wrench 11 16 in open end wrench Small flat tip screwdriver included with EC100 and CPEC200 Large flat tip screwdriver included with EC100 Sledgehammer to drive grounding rod into the ground 3 16 in hex key wrench included with CM250 leveling mount 15 CPEC200 Closed Path Eddy Covariance System 16 5 1 Mounting 5 1 1 Support Structure The CPEC200 system has four major components that must be mounted to a user provided support structure The support structure itself is not included in the CPEC200 so that it can be tailored to specific needs but several options are available Contact a Campbell Scientific applications engineer for more information on site specific mounting options
40. f and press Enter Wait at least 10 s before you proceed to the next step This will allow the CPEC200 to measure the offset in the differential pressure sensor 3 H2O Use the CR3000 keypad to navigate to the Field Zero menu to set Mode to H20 Span This will open the valve so that the dew point generator can push humid air sample to the EC155 4 H20 Under Field H20 Span submenu select Span DP Tmpr Enter the value to which the dew point generator was set in C and press Enter 5 H20 Monitor the reported values of H2O DP Tmpr C and H20 mm m mmole mole found in the Field H2O Span submenu Wait for the reading to stabilize this may take several minutes and record the value of H2O mm m This provides a record of the present state of the EC155 s H5O span 6 Under the Field CO2 Span submenu verify that CO2 Span Gas has the correct CO concentration Change the mode to Span CO2 1 so that CO span gas will flow from the cylinder to the EC155 analyzer Monitor CO2 um m until equilibrium is reached Write down the value of CO2 um m 7 Under the Field Zero submenu change the mode to Zero all which will allow zero gas to flow from the cylinder to the EC155 analyzer Monitor CO2 um m and H2O mm m until equilibrium is reached and write down the final values Following the manual zero span these recorded values can be used to characterize offset and gain drift 10 11 CPEC200 Closed Path Eddy Covariance System W
41. frared absorption gas analyzer that measures molar mixing ratios of carbon dioxide and water vapor More information about the operation of the EC155 can be found in the manual EC 55 CO and H O Closed path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer at www campbellsci com n ren a Tie b m a T Dima FIGURE 4 14 EC155 gas analyzer 11 CPEC200 Closed Path Eddy Covariance System 12 4 2 2 CSAT3A Sonic Anemometer Head The CSAT3A is an ultrasonic anemometer sensor head for measuring wind speed in three dimensions It shares integrated electronics EC100 with the EC155 gas analyzer It is similar to the sensor head for the CSAT3 sonic anemometer the primary difference being that the CSAT3 includes its own electronics The CSAT3A uses three nonorthogonal pairs of transducers to sense the wind velocity vector Each pair of transducers transmits and receives ultrasonic pulses to determine the time of flight which is directly related to the speed of sound and the wind speed along the line between the pair of transducers The CSAT3A transforms the results into orthogonal wind components ux uy and u referenced to the anemometer head The CSAT3A also determines the speed of sound for each transducer pair These measurements are averaged and converted to sonic virtual temperature Ts based on the relationship between speed of sound and air temperature For more detailed information and specificati
42. g to EC100 electronics Power Cable to EC100 Power Cable to 12Vdc Power Supply off v g Te SDM Cable to EC100 FIGURE 5 10 Wiring to CPEC200 enclosure 24 CPEC200 Closed Path Eddy Covariance System 5 3 3 Pump Module Cable Ensure the CPEC200 system is not powered and connect the pump module cable to the bottom of the CPEC200 system enclosure 5 3 4 Apply Power NOTE CAUTION NOTE NOTE The CPEC200 requires a user supplied 10 5 to 16 0 Vdc power source Its average power consumption is 12 W typical but will be slightly higher at cold temperatures especially at startup in cold weather Before applying power verify all of the tubes and cables have been connected according to the instructions above To reduce the risk of shorting the power supply this is especially important when using batteries connect the power cable to the CPEC200 first and then connect the other end to the power source Carefully design any DC power source to ensure uninterrupted power Contact a Campbell Scientific applications engineer for assistance if needed Connect a power cable CABLEPCBL L from the CPEC200 power terminals as shown in FIGURE 5 10 to a user supplied 12 Vdc power supply Relieve strain on the cables in the CPEC200 by using a cable tie to secure the cables to the cable tie loop on the plate next to the CPEC200 DIN rail Replace the cap on the CPEC200 enclosure feedthrough Gently bend the cables
43. gh the Exhaust fitting on the bottom of the enclosure It uses a small double head diaphragm pump 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 weather tight fiberglass enclosure The pump module includes a large filter cartridge to dampen the pressure fluctuations from the pump and to protect the pump from particulates or debris The following sections describe operating parameters of the pump Pump Speed The pump tachometer is measured converted to volumetric flow rate and reported in public variable pump flow The CPEC200 sets the value of public variable pump flow duty cycle to a value between 0 off and 1 full speed to adjust the pump s speed as needed to match pump flow to the setpoint flow pump flow set pt Pump flow set ptisa system configuration variable see Section 5 5 System Configuration Variables Pump Inlet Pressure The measured inlet pressure of the pump is reported in public variable pump press This pressure will normally be slightly lower 1 kPa than the EC155 sample cell pressure due to the pressure drop in the pump tube 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 CPEC200 will disable the pump The pump module has a heater
44. ith zero air still flowing in Zero_all mode scroll down the Field Zero submenu and select Do Zero Press Enter while True is highlighted This will send the zero command to the EC155 After a few seconds the reported values for CO2 um m and H2O mm m should be reset to approximately 0 Navigate back to the Prfrm Field CO2 Spn submenu change the mode to Span CO2 1 wait for CO2 um m to stabilize and then select Do CO2 Span Press Enter again to send the CO span command to the EC155 H20 Navigate back to the Prfrm Field H2O Spn submenu change the mode to Span H2O wait for H2O mm m to stabilize which could take several minutes before selecting Do H2O Span Press Enter again to send the H O span command to the EC155 Navigate back to the System Control menu and select the Run Station menu Change the EC Mode back to the desired mode of operation EC on auto zro spn or EC off auto zro spn 6 3 2 Remote LoggerNet This section gives instructions on how to do a manual zero span on site using the LoggerNet interface to a PC It is also possible to use the LoggerNet interface onsite To do a remote manual zero span follow this procedure E Launch LoggerNet and open the Connect Screen Connect to the CPEC200 s CR3000 datalogger Open a Data Monitor Window Add the following variables from the public table to the Data Monitor valve tmpr okay f valve tmpr mode CO2 span gas CO2 H2O sec on site do zero flg and do CO2 sp
45. led datalogger such as the CR3000 in the CPEC200 The apps support field maintenance tasks such as viewing and collecting data setting the clock and downloading programs CPEC200 Closed Path Eddy Covariance System 10 4 1 5 Replacement Parts Intake Filter The EC155 intake filter FIGURE 4 11 will become clogged over time and must be replaced The default replacement part 1s pn 26072 It 1s a 2 5 cm 1 0 in diameter sintered stainless steel disk filter with a 20 um pore size encased in a molded Santoprene shell An alternative 40 um filter pn 28689 is also available Use a 40 um filter if the default 20 um filter clogs long before the EC155 optical windows become dirty FIGURE 4 11 Intake filter of EC155 Sonic Wicks A sonic wicks spares kit pn 28902 is used to replace the wicks ona CSAT3A The kit includes three top wicks three bottom wicks an installation tool and adhesive Silica Desiccant Bags Silica desiccant bags FIGURE 4 12 are used to desiccate the CPEC200 system enclosure and should be periodically replaced A single 4 unit silica desiccant bag is pn 4905 These can be purchased in quantities of 20 as pn 6714 DO NOT EAT UNITED DESICCANTS G 101CHRISTINE BELEN NEW oie DESI PAK SPECIFICATION MIL D 3 3464 TYPE amp il REACTIVATION TIME IN BAG 16 HOURS AT 250 F NTS PACKAG ACTIVATED 4 pri USE BAGGED FOR UNITS e DEHUMIDIFICATION DO NOT EAT UNITED DESICCANTS GATE
46. n none Sample atmospheric air for eddy covariance measurements 1 2 4a 3a 3b 4b 5 q 1 Q Q C If mode 1 at the appointed time the CPEC200 will begin an automated zero span sequence This step measures the offset in the EC155 s differential pressure sensor as required for controlling the zero span flow in later steps This step requires at least 10 s to complete 5 s for the pressure to equilibrate and 5 s to average and store the differential pressure measurement The duration of this step is determined by constant SECONDS ON SITE 2 with a default of 10 s In step three the CPEC200 measures the EC155 s response to the CO span gas It opens the CO2 Span 1 valve to allow the CO span gas to flow to the EC155 The pressure regulator on the CO span tank provides the pressure needed to push this flow through the valve module up the tube to the EC155 and through the sample cell and intake tube to the atmosphere The valve module opens a proportional control valve as needed to maintain the measured flow rate valve flow at the user defined setpoint valve flow set pt In this step the sample pump 1s off This step measures the EC155 response to CO span gas but it does not set the CO span The duration of this step 1s determined by constant SECONDS ON SITE 4a with a default of 60 s In step four the CPEC200 measures the EC155 response to the zero air It turns off the sample pump and opens the Zero valve to allow the zero
47. n cylinder is selected One long tube is required to connect the valve module to the EC155 and two short tubes are required to connect the zero and CO span cylinders to the valve module Pre swaged tube assemblies pn 21823 L are available for this purpose AC DC Power Adapter Kit An AC DC adapter kit can be configured within the CPEC200 system enclosure to allow the CPEC200 to be powered from AC mains power Contact a Campbell Scientific applications engineer for further information CF Card The CPEC200 stores data on a CompactFlash memory card There are two types of CF cards available today industrial grade and 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 or CFMC16G FIGURE 4 7 available from Campbell Scientific For more details about this card see CPEC200 Closed Path Eddy Covariance System Application Note 3SM F PC CF Card Information available from www campbellsci com USB Memory Card Reader Writer The USB memory card reader writer pn 17752 1s shown in FIGURE 4 10 It is a single slot high speed reader writer that allows a computer to read a memory card When used with Campbell Scientific equipment the 17752 typi
48. of the CPEC200 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 Overview The CPEC200 is a closed path EC flux system used for long term monitoring of atmosphere biosphere exchanges of carbon dioxide water vapor heat and momentum 4 1 System Components The CPEC200 consists of several components some of which are optional Some additional accessories are required to complete a fully functioning CPEC200 system and are described and illustrated in the sections that follow 4 1 1 Standard Components Standard with the CPEC200 are the CPEC200 system enclosure EC155 gas analyzer EC100 electronics and CPEC200 pump module 4 1 1 1 EC155 Gas Analyzer The EC155 is a closed path infrared CO H O gas analyzer It shares integrated electronics EC100 electronics with the CSAT3A sonic anemometer head For detailed information and specifications see the EC155 manual The EC155 is included as part of the CPEC200 S pu 5 a ER c FIGURE 4 1 EC155 closed path CO2 H20 gas analyzer CPEC200 Closed Path Eddy Covariance System 4 1 1 2 EC100 Electronics The EC100 electronics module controls the EC155 and CSAT3A It is h
49. ommended approach for zero span involves both monitoring and setting the zero span according to the following steps Measure the H O span with a dew point generator Measure the CO span Measure the CO and H5O zero Set the CO and H50 zero in the EC155 Measure the CO span again after zero has been set Set the CO span in the EC155 Measure the H20 span again after zero has been set Set the H5O span in the EC155 db ob E nl En Ee NOTE Steps 1 7 and 8 require the use of the dew point generator and must be omitted for remote operations including the automated zero span 6 2 Automatic Zero and Span The automatic zero span sequence consists of eleven steps listed in the table below If mode 1 the CPEC200 will periodically cycle through the sequence as listed If mode equals any value 2 through 8 the CPEC200 is in manual control mode and will remain in the mode selected subject to timeout limits If mode 9 the CPEC200 will sample atmospheric air for eddy covariance measurements no automatic zero span 31 CPEC200 Closed Path Eddy Covariance System 32 TABLE 6 1 Automatic Zero Span Sequence Pump Valves Step Site State On Description None sample atmospheric air for eddy covariance measurements none Measure atmospheric pressure for flow control CO Measure CO Span 1 spanl off CO Set CO Span Spanl Measure CO Span 2 Span2 Measure CO Span 3 Span3 Measure CO Span 4 Span4 HO Not used Spa
50. ons see the CSAT3 manual WM 7 MW FIGURE 4 15 CSATS3A sonic anemometer head 4 2 3 Valve Module The optional valve module shown in FIGURE 4 8 is housed in the CPEC200 enclosure and is used to automate zero and CO span checks and automatically perform a zero and CO span on a user defined interval As described in Section 4 1 2 3 CPEC200 Valve Module H2O span requires a dew point generator and cannot be automated because the dew point generator is a laboratory instrument meaning H20 spans must be performed manually The CPEC200 valve module is available in two versions one with three valves pn 27559 and another with six valves pn 26578 The valve module is normally ordered as a factory installed option but can also be ordered separately and installed by the user CPEC200 Closed Path Eddy Covariance System For the three valve version the inputs are e Zero e CO Span 1 e H O Span For the six valve version the inputs are Zero CO Span 1 CO Span 2 CO Span 3 CO Span 4 H O Span The CPEC200 s zero and CO span inlets are not bypass equipped meaning that they flow only when selected This allows the zero and CO span tanks to be continuously connected for automatic unattended operation The H5O Span input is bypassed vented to the atmosphere through the H O Span Bypass outlet when it is not selected so it permits flow all the time This allows a dew point generator to be connected directly to the HO
51. oused in its own enclosure and must be mounted within 3 m of the sensors Electronics FIGURE 4 2 EC100 electronics module 4 1 1 3 CPEC200 Enclosure The CPEC200 enclosure houses the CR3000 datalogger control electronics the optional valve module and communications and power terminals Several options for mounting to a tower tripod body or leg or large diameter pole can be specified when ordering the system CPEC200 Closed Path Eddy Covariance System CAMPBELL SCIENTIFIC FIGURE 4 3 CPEC200 system enclosure CPEC200 Closed Path Eddy Covariance System 4 1 1 4 CPEC200 Pump Module The pump module uses a small low power diaphragm pump to draw air through the EC155 sample cell The pumping speed is automatically controlled to maintain the volumetric flow at the setpoint 3 to 7 LPM The pump module is temperature controlled to keep the pump in its operating temperature range of 2 C to 55 C The pump module includes a large capacity filter to protect the pump from contamination and dampen pressure fluctuations in the sample cell caused by the pump EY CPEC200 Pump Module E CAMPBELL G SCIENTIFIC FIGURE 4 4 CPEC200 pump module 4 1 2 Optional Components 4 1 2 1 CR3000 Datalogger The CR3000 datalogger is housed in the CPEC200 enclosure The CR3000 executes and stores measurements from all sensors It calculates online flux measurements and stores both raw and processed data
52. pump module see FIGURE 5 5 If the EC155 is within 15m 50 ft of the pump module 3 8 in OD tubing such as pn 26506 is recommended For longer distances of up to 150 m 500 ft a 1 2 in OD tube pn 25539 is recommended to minimize pressure drop in the tube NOTE The fittings on the ECI55 and the pump module are sized for 3 8 in OD tubing A reducer is required at each end for the larger tubing size Campbell Scientific supplies pre swaged pump tube assemblies pn 26503 L 1 2 in OD with reducers at each end for this purpose Connect one end of the pump tube to the fitting labeled Pump on the back of the EC155 analyzer Connect the other end to the fitting labeled Inlet on the CPEC200 pump module as shown in FIGURE 5 5 19 CPEC200 Closed Path Eddy Covariance System 20 5 2 2 Zero Span NOTE NOTE FIGURE 5 5 Connecting pump tube from EC155 analyzer to pump module The CPEC200 can perform automated zero CO and H20 and CO span of the EC155 The user must supply cylinders of zero air and CO span gas with appropriate regulators Install cylinders in close proximity to the CPEC200 system enclosure Each cylinder must have a pressure regulator to control the outlet pressure at 10 psig and must have a 1 4 in Swagelok fitting on the outlet Connect regulators to the valve module inlets using 1 4 in OD tubing such as pn 15702 or pre swaged tube assemblies pn 21823 L Minimize the length of these tubes to reduce the equilibr
53. quired 5 5 1 Sonic Anemometer Azimuth The variable sonic azimuth specifies the angle in degrees between true north and the direction that the sonic anemometer is pointing For example if the sonic anemometer is pointing due east set sonic azimuth to 90 If the sonic anemometer is pointing southwest enter 225 etc sonic azimuth is used to calculate wnd dir compass 5 5 2 CO Span Cylinder Concentration Variable CO2 span gas is the CO concentration ppmv of the CO span cylinder It is used to span the EC155 for CQ 5 5 3 H2O Span Dew Point Temperature 26 Variable Td span gas is the dew point temperature setting of the dew point generator It is used to span the EC155 for H5O CPEC200 Closed Path Eddy Covariance System 5 5 4 Sample Intake Flow Rate Variable pump flow set pt determines the volumetric flow rate at which the pump will draw the air sample through the EC155 sample cell The default setting is 7 0 LPM In tall tower applications where decreased frequency response is acceptable lowering the flow rate may be desirable as it will prolong the life of the intake filter This may be particularly applicable if the site is dusty or if accessing instruments on the tower is difficult Decreasing the flow by a factor of two will generally lead to a four fold increase in filter lifetime 5 5 5 Zero Span Gas Flow Rate Variable valve flow set pt determines the rate at which the zero or CO span gas will flow The path
54. r setting 1s reached The H5O 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 H2O Span inlet is bypass equipped allowing continuous flow This inlet can be connected directly to the output of a dew point generator The bypass on this inlet will avoid pressurizing the dew point generator 5 3 1 Ground Connections The CPEC200 system enclosure and the EC100 electronics must be earth grounded as illustrated in FIGURE 5 6 Ground the tripod and enclosures by attaching heavy gage grounding wire 12 AWG minimum to the grounding lug found on the bottom of each enclosure The other end of the wire should be connected to earth ground through a grounding rod For more details on grounding see the grounding section of the CR3000 Micrologger Operator s Manual 21 CPEC200 Closed Path Eddy Covariance System FIGURE 5 6 Enclosure and tripod grounded to a copper clad grounding rod 5 3 2 EC Sensor Cables Ensure the EC100 is not powered Connect the EC155 gas analyzer head EC155 sample cell and CSAT3A sonic anemometer head to the EC100 electronics FIGURE 5 7 shows the electrical connections described in this section For more details see the EC 55 CO and H 0 Closed Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer manual ECI155 Analyzer Cable EC155 Sample cell Cable C
55. rugged Santoprene jacket It is cut to the specified length and the end finished for easy installation Pump Tube A tube must be used to connect the EC155 to the pump module If the EC155 is within 50 ft of the pump module 3 8 in OD tubing such as pn 26506 is recommended For longer distances up to 500 ft a larger 1 2 in OD tube pn 25539 is recommended to minimize pressure drop in the tube pre swaged pump tube assemblies such as pn 26504 L 3 8 in OD or pn 26503 L 1 2 in OD are available for this purpose The fittings on the EC155 and the pump module are sized for 3 8 in OD tubing A reducer is required at each end for the larger tubing size These reducers are supplied as part of the pre swaged tube assembly The L designation after certain parts designates a cable or tube length in feet The length is specified by the user at the time of order Zero span tubes Tubes must be used to connect the EC155 and the zero and CO span cylinders to the valve module Bulk tubing may be cut to length and installed onsite using pn 15702 or its equivalent This tubing has a 1 4 in OD to fit the Swagelok fittings on the EC155 and the valve module 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 is a 500 ft roll Minimize the length of these tubes to reduce the equilibration time after the zero or CO spa
56. s for Swagelok inserts B 3 B 3 Dimensions and part numbers for Swagelok ferrules B 4 B 4 Dimensions and part numbers for Swagelok plugs B 5 B 5 Dimensions and part numbers for Swagelok caps B 6 Table of Contents CPEC200 Closed Path Eddy Covariance System 1 Introduction The CPEC200 is a closed path eddy covariance EC flux system used for long term monitoring of atmosphere biosphere exchanges of carbon dioxide water vapor heat and momentum This complete turn key system includes a closed path gas analyzer EC155 a sonic anemometer head CSAT3A datalogger CR3000 sample pump and optional valve module for automated zero and span Before using the CPEC200 please study e Section 2 Cautionary Statements e Section 3 nitial Inspection e Section 5 Installation Operational instructions critical to the preservation of the system are found throughout this manual Before using the CPEC200 please study the entire manual Further information pertaining to the CPEC200 can be found in the Campbell Scientific publications EC 55 CO and H O Closed Path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer manual available at www campbellsci com Other manuals that may be helpful include CR3000 Micrologger Operator s Manual CFM100 CompactFlash Module Instruction Manual NL115 Ethernet and CompactFlash
57. s off the sample pump and allows zero air to flow from the cylinder to the EC155 analyzer If a 6 valve module is used this is the same as Span CO2 1 but for the 2 CO span gas EC off auto zro sp n If a 6 valve module is used this is the same as Span CO2 1 but for the 3 CO span gas If a 6 valve module is used this is the same as Span CO2 1 but for the 4 CO span gas This mode turns off the sample pump and allows air from the dew point generator to flow to the EC155 analyzer Automatic zero span checks and zero spans are disabled The system will continuously sample ambient air This mode turns off the sample pump and allows CO span gas to flow from the first Span CO2 1 CO cylinder Note that if a 3 valve module is being used this is the only CO cylinder 5 8 Verify Proper Operation Verify proper operation of the CPEC200 system by checking the following public variables that correspond to the system components as listed below 29 CPEC200 Closed Path Eddy Covariance System EC155 Verify diag irga 0 This is equivalent to a green GAS light on the EC100 Verify CO2_ sig strgth and H2O sig strgth are gt 0 80 Verify diff press is between 7 0 and 7 0 kPa Verify the values of CO and H5O are reasonable Consult the EC155 user manual to diagnose and solve problems with the EC155 CSAT3A Verify diag sonic 0 This is equivalent to a green SONIC light on the EC100
58. ssembly 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 as you cut it 4 Pushan 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 in sized fittings tighten the nut three quarters turn First time assembly metal tubing Extra care is needed to avoid overtightening 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 l 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 finger tight 3 While holding the fitting body steady tighten the nut until it feels tight This will normally 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
59. t per the EC155 user manual Bit 7 Sonic anemometer diagnostic Bit 7 of system diag indicates there is a problem with the sonic anemometer To confirm the problem check the value of diag irga and troubleshoot per the sonic anemometer user manual Appendix B Using Swagelok Fittings B 1 Assembly NOTE This appendix gives a few tips on using Swagelok tube fittings For more information consult your local Swagelok dealer or visit their web site 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 Six mm is very close to 1 4 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 tube 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 this indicates 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 a
60. tripod mast uuueueusse 18 5 3 Mounting of EC155 and CSAT3A seeeeeeeeseseseeeeens 18 5 4 Plumbing connections shown without mounting hardware CSAT3A electrical connections and tripod or tower 19 5 5 Connecting pump tube from EC155 analyzer to pump module 20 5 6 Enclosure and tripod grounded to a copper clad grounding rod 22 5 7 ECI155 electrical connections mounting hardware not shown 22 5 8 Wiring of power and communications eese 23 5 9 Wiring to EC TOO eIecLpotiiCS aio Ert die et 24 5 10 Wiring to CPEC200 enclosure a a e ER i hei 24 Bel xydbelok TUSCE sso cce Ee uias ade ue serbe uses ee B 3 B 2 Front and back Swagelok ferrules sssss B 4 B5 SSWaASClOK plugs eer Rr e asit pa n nube Le es B 5 B 4 AOW PpclokB Cap neia a date e rA vs italia seq B 6 Tables SPEM SOM Ant omm 23 5 2 Configurable Constants in CPEC200 Automatic Zero Span 28 5 3 Other System Constants eoe ete en tok tete ptSR ERN EOMSSUER EXER REESE 28 5 4 CPEC200 Modes of Operation eeeeeeeeeesesseeeeens 29 6 1 Automatic Zero Span Sequence eeeeeeessesseeee nns 32 A 1 Summary of bit numbers indicating conditions outside normal aE FAN OC E E E E E EETA T A 1 B 1 Available plastic tubing sizes construction and usage guidelines B 2 B 2 Dimensions and part number
61. ublic variable system diag indicates conditions outside the normal operating range for the CPEC200 Any value other than zero indicates a problem System diag contains several error flags encoded as binary bits To diagnose a problem first decode the value according to TABLE A 1 and then see the appropriate section below TABLE A 1 Summary of bit numbers indicating conditions outside normal operating Binary Bit LSB 1 E range s Vave iepene ouside ns oper anee Example 1 Assume system diag 33 Because 33 32 1 this indicates bit 6 numeric value 32 and bit 1 numeric value are set This means there are two problems e Bit 6 the IRGA diagnostic word is nonzero e Bit 1 The EC155 is powered down This could arise if the user has set the variable ec155 off fle True to manually power down the EC155 The following sections give details on each of the diagnostic bits Bit 1 EC155 is powered down If bit 1 of system diag is set this indicates the EC155 is powered down This may happen if the user manually powers it down by setting ec155 off flg True if the battery voltage is too low or if the EC155 detects a problem and automatically powers down Bit 2 Pump temperature is outside its operating range Bit 2 of system diag indicates the pump temperature is outside its operating range This triggers the CPEC200 to shut down the pump to protect the pump from possible damage A 1 Appendix A CPEC200
62. wind flowing past the mounting structure and EC sensors The outer diameter of the crossarm should be 3 33 cm 1 31 in The CM202 crossarm is shown in FIGURE 5 2 17 CPEC200 Closed Path Eddy Covariance System 18 CM210 Crossarm to Pole Bracket CM202 Crossarm FIGURE 5 2 CM210 mounting bracket on a tripod mast The EC155 gas analyzer and CSAT3A sonic anemometer head are mounted on the end of the crossarm using the CM250 leveling mount and the CPEC200 mounting platform as shown in FIGURE 5 3 Adjust the tilt of the mounting platform to level the CSAT3A For more details see instructions in the EC755 CO and H O Closed path Gas Analyzer and EC100 Electronics with Optional CSAT3A 3D Sonic Anemometer manual Leveling Bubble CSAT3A Sonic Pa Anemometer Head EC155 AS J pnr f Gas Analyzer CM20X Crossarm Mounting P al Platform CM250 Leveling dd Mount FIGURE 5 3 Mounting of EC155 and CSAT3A CPEC200 Closed Path Eddy Covariance System 5 2 Plumbing FIGURE 5 4 shows the basic plumbing configuration of a CPEC200 with the cylinders required for zero and span operations Zero Air Tubing Pump Tubing Analyzer Tubing lt lt gt E Las ss TESf2200 ead d a CO Span Gas Tubing Pump Module Cable x NJ FIGURE 5 4 Plumbing connections shown without mounting hardware CSAT3A electrical connections and tripod or tower 5 2 1 Pump Module Connect the EC155 to the

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