Measurement of CO 2 Evolution in a Multiplexed Flask System
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1 Measurement of CO 2 Evolution in a Multiplexed Flask System App. Note 27 Introduction The LI-850 is a robust and simple to use multiplexer designed to interface up to sixteen soil CO 2 flux chambers with the LI-800A Automated Soil CO 2 Flux System. Here we describe considerations for constructing a multiplexed system for measuring CO 2 evolution in flasks utilizing the LI-800A and LI-850. We complete this example by demonstrating a twelve flask system used to measure respiration of detached fruit. Flask Volume, Mixing and Flow Considerations due to instrument noise increases. For the LI-800A this noise is known and its effects have been modeled over a range of dc/dt for various sampling periods (Figure ). A chamber volume should be chosen that over the range of expected fluxes, ensures dc/dt is large enough to be outside the influence of instrument noise. In circumstances where there are constraints on chamber size, the observation length used by the LI-800A can be adjusted to improve the estimate of dc/dt, as increasing the number of data points used in the calculation will decrease the effect of noise (Figure ). Volume The LI-800A operates as a closed system, determining CO 2 flux from the change in CO 2 mole fraction over time in a fixed volume. In its simplest form (ignoring dilution due to water vapor and not standardizing the rate for sample area or mass) the relationship between carbon flux and the change in CO 2 mole fraction with time takes the following form Fractional Error F PV RT dc dt = () where F is the flux in μmol s -, P is pressure in kpa, V is the system volume in liters, R is the ideal gas constant, T is temperature in K, and dc/dt is the change in CO 2 mole fraction with time (μmol mol - s - ). At ambient pressure, system volume is the single largest factor controlling the relationship between dc/dt and flux. Given the same flux, changing the gas temperature from 20 to 40 C will only change dc/dt by about 7%, while doubling the system volume will cut dc/dt nearly in half because the increased volume serves to dilute the change in CO 2 mole fraction within the system. As dc/dt decreases, the potential for error in the measurement dc/dt (µmol mol - s - ) Figure. The relationship between potential measurement error due to instrument noise and the change in CO 2 mole fraction with time. Lines are fit to data modeled over 60 (open boxes), 20 (closed boxes), 80 (open circles) and 300 (closed circles) second sampling periods (i.e., observation length minus the deadband). Figure 2 shows the relationship between dc/dt and the flux for several chamber volumes at standard temperature and pressure. This, and the information in Figure, can be used as guides for selecting an appropriate chamber volume and observation length when designing an experiment. Continued on next page
2 2 dc/dt (µmol mol - s - ) Mixing It is important that the volume of air inside the chamber be well mixed to ensure that fluxes are calculated using representative samples of the chamber CO 2 mole fraction. If there are pockets of unmixed air inside the chamber, these can act as sources or sinks for CO 2 and cause errors in the flux measurement. For chamber volumes less than about four liters the pump inside the LI-850 may provide adequate mixing. However, this is contingent on the geometry of both the chamber and the sample, and how the sample is positioned within the chamber. If additional mixing is required, small fans or baffles can be installed inside the chamber. Flux (fan on) µmol kg - s Flux (µmol s-) y =.020x R 2 = Flux (fan off) µmol kg - s - Chamber Volume (L) Figure 2. The relationship between the change in CO 2 mole fraction with time and flux for several chamber volumes at standard temperature and pressure. Figure 3. Mixing evaluation on a four liter chamber connected to the LI There is little difference between fluxes measured with the chamber fans on or off indicating that the pump inside the LI-6200 sufficiently mixed the chamber volume. It is possible to determine if there is adequate mixing inside a chamber by looking at the relationship between fluxes measured under normal operating conditions and fluxes measured where mixing is known to be good. In the example shown in Figure 3 we measured respiration from navel oranges using a four liter chamber attached to the LI-6200 Portable Photosynthesis System. Measurements were made in pairs on the same fruit, with either mixing due only to the pump inside the LI-6200 or with additional mixing using two fans installed in the chamber. There is little difference in the measured fluxes with either the fans on or off, indicating that the chamber volume is sufficently mixed using only the LI-6200 pump. Flow and chamber conditions between measurements When configured as a multiplexed flask system, a plumbing change inside the LI-850 allows flasks to be continuously flushed with ambient air between sampling periods. This serves as the mechanism by which CO 2 and water vapor are exported from the system between measurements, preventing condensation and excessively high CO 2 mole fractions from developing in the flask. The flushing rate is determined by the flow rate, provided by an auxiliary pump, and the flask volume. The time required to reduce the flask concentration by 63% (i.e., /e) is given by τ = V f (2) where τ is the time constant in seconds, V is the chamber volume in liters, and f is the flow rate through the chamber in l s -. For applications where condensation inside the chamber is unlikely, and the chamber CO 2 (or other gas species; ethylene for example is known to influence respiration rates of fruit) mole fraction has little or no affect on the processes driving the flux, this is of little importance; however, the time constant is much more important in situations where condensation may occur, or when other gases present in the flask might influence the CO 2 flux. In these situations it may be useful to model the inchamber mole fraction of the offending gas species to determine a flow rate appropriate to keep the mole fraction below problem levels. Where increasing the flow rate is not feasible, chemically scrubbing the gas species from the incoming gas stream may be necessary. Ignoring the influence of other gas species, under well mixed and steady state conditions, the chamber mole fraction for a particular gas species is controlled by the flux of
3 3 that species from the sample and the flow rate through the flask, as given by C o F = + Ci (3) f where C o is the in-chamber mole fraction of the gas species in μmol mol -, F is the flux of the species in μmol s -, f is the flow rate through the flask in μmol s -, and C i is the incoming mole fraction in μmol mol -. When the flux is positive (net efflux from the sample), increasing the flow rate (decreasing τ) or decreasing the incoming CO 2 mole fraction will decrease the mole fraction of CO 2 in the chamber. Configuring the LI-850 and LI-800A for multiplexed flask measurements These instructions describe the changes that are required in order to adapt a sixteen port multiplexer for flask measurements. The procedure for modifying an eight port multiplexer is very similar, and where significant differences exist, they have been noted. A list of parts available from LI-COR necessary for these modifications is included in the appendix. Plumbing Some plumbing changes are required in order to configure the LI-850 to continuously flush chambers with ambient air between sampling periods. Refer to Figure 5 to compare a normal LI-850 with one modified for use with a flask system A. B. C.. Remove three of the brass plugs with a small adjustable wrench and one of the steel plugs with a 3/6 inch hex key. These plugs usually seal the inner side (the side closet to the LI-850 control panel) of the solenoid manifolds, as shown in Figure 4A. If modifying an eight port multiplexer, only remove the two brass plugs from the right hand upper and lower solenoid manifolds. 2. Using an adjustable wrench, replace the three brass plugs with quick-connect elbows (part # ) and the one steel plug with a quick-connect elbow (part # ) (Figure 4C). Note that the metal base of the quick-connect fittings can be turned independently of the upper plastic portion without damaging the fitting. It may be helpful to insert a short piece of Bev-a-line tubing into the fitting to help hold it in position while tightening the metal base. For the sixteen port model, in order to add a quick-connect fitting to the lower left solenoid Figure 4. Solenoid connections used to flush flasks between sampling periods. The figure shows changes to the manifolds in a 6-port multiplexer. For an 8-port multiplexer, replace only the plugs on the two righthand solenoid manifolds; there is no need to remove the multiplexer control panel. A. The inside of a 6-port multiplexer. Remove the three brass plugs (circled in red and yellow) using a small adjustable wrench, and the steel plug (circled in green) with a 3/6 inch hex key. Note that the brass plug on the lower right manifold is not visible in this image (yellow circle). Remove the control panel and disconnect the air supply line from the lower left manifold (arrow). B. A 6-port multiplexer with the four plugs and control panel removed. Install quick connect fittings in place of the plugs that were removed as shown in panel C. C. The multiplexer reassembled with connections for an auxiliary pump installed. Part number is used in place of the brass plugs and part number is used in place of the steel plug.
4 LI-800A ACU Filter Flow Meter Chamber LI-850 Pump Subsample Loop Solenoid Manifold A. Deactivated Solenoid Auxiliary Pump Solenoid Flask Subsample Loop LI-850 Pump B. Activated Solenoid Flow Meter Quick Connect LI-800A ACU Manifold Exhaust Line Figure 5. Flow schematics for the LI-850 configured for normal operation (top) and configured for flask measurements (bottom right). The flow path used during measurements is shown with blue arrows and the flow path used to flush flasks between measurements is shown with red arrows. In both diagrams the solenoids at port 3 are activated and the chamber connected there is being sampled. The box in the lower left hand corner shows how the flow path changes inside the solenoid manifold when a solenoid is activated.
5 5 manifold, the hose connecting the lower left solenoid manifold to the pump will have to be temporarily removed. First, remove the two thumb screws that secure the control panel to the LI-850 and the ribbon cable from the side of the control panel, and set the control panel aside (Figure 4B). Carefully remove the hose from the quick-connect fitting by pressing down on the orange ring and pulling out on the hose. Rotate the fitting out of the way. After the second quick-connect fitting has been added replace the hose, seating it firmly in the fitting, and reinstall the control panel (Figure 4C). 3. Ventilation to the flasks is provided with an 8 L/min diaphragm pump (part #998-73) that can be installed inside the LI-850. If installing this pump in a sixteen port multiplexer remove the quickconnect straight union installed on the pump outlet and replace with a quick-connect Y fitting (part # ) as shown in Figure 6B. If installing in an eight port multiplexer no modification is needed (Figure 6A). 6. Locate the main power supply cable inside the LI-850 (part #998-08; Figure 8). One end of this cable terminates in a four-pin slip connector connected to the main circuit board and the other in a four-pin Eurofast bulkhead mounted to the side of the LI-850 case. Remove the cable by disconnecting the four pin slip connector from the circuit board and removing the nut on the outside of the LI-850 from the Eurofast bulkhead. A. B. C. A. B. Figure 6. A. No modifications are needed to the pump if installing it in an eight port multiplexer. B. This pump is being installed in a sixteen port multiplexer, so a quick connect Y union is installed on the outlet, in place of the straight union the pump comes with. 4. Before installing the pump, attach the pump assembly power cable (part #998-77). This cable connects to the pump via a three-pin slip connector on the underside of the pump. 5. Remove the cover plate from the instrument by loosening the two thumb screws (Figure 7A). Mount the pump in the LI-850 case by attaching the mounting plate to one of the two threaded holes normally used to attach the cover plate (Figure 7B). Use one of the three 3/8 inch #6-32 hex cap screws (part # ) and the 7/64 inch long arm hex key (provided) to attach the mounting plate to the LI-850. Use the remaining two hex cap screws to attach the pump to the plate. Figure 7. The pump mounting plate can be installed inside the LI-850 case using one of the two threaded holes normally used to attach the cover plate. A. Loosen the two thumb screws (indicated with arrows) to remove the cover plate. B. Use one 3/8 inch long #6-32 hex cap screw to install the mounting plate in place of the cover. C. Use the remaining two screws to attach the pump to the mounting plate. 7. Install the pump assembly power cable into the multiplexer in place of the power cable removed in step 6 (Figure 8). When the new Eurofast bulkhead is installed the nut on the bulkhead needs to be tightened to 72 inch-lbs of torque to ensure a water tight seal. 8. Cut two (one for an eight port multiplexer) 48 cm sections of Bev-a-line tubing. The two pieces of tubing are kept at the same length to help ensure that flow from the pump is split equally between the two manifolds. For a 6-port multiplexer insert one end of each hose into the Y fitting (part # ) installed in step 3, and insert the other end into one of the quick-connect fittings added to the lower solenoid manifolds in step 2.
6 6 Exhaust lines Install plugs ( ) in the open connectors on the solenoid manifolds Connect the exhaust lines to the out line from one of the ports using part # Connect the in line from the same port to the inlet on the auxiliary pump Ambient air line from pump Pump To disconnect power to the pump, unplug this connector power cable in an unmodified multiplexer Figure 8. A sixteen port multiplexer configured for flask measurements. Port 6 has been re-purposed to vent flask exhaust from the LI-850 case and supply ambient air to the pump. For an eight port multiplexer connect the pump outlet with a single section of Bev-a-line tubing to the lower right hand solenoid manifold. 9. There are two ways to configure the LI-850 to vent exhaust from the flasks. a. Method : Dedicate a port on the multiplexer to supply air to the auxiliary pump and expel exhaust from the chambers. i. Disconnect the two urethane hoses coming from one set of port connections on the side of the LI-850 from the solenoid manifolds. ii. Insert /4 inch quick connect plugs (part # ) into the open fittings on the solenoid manifolds (Figure 8). iii. Connect the urethane hose from the IN connection of the port to the inlet of the auxiliary pump using a quick connect straight union. iv. For a sixteen port model install a quickconnect Y fitting (part # ) on the end of the OUT hose. For an eight port multiplexer, install a quick connect straight union (part # ) on the OUT hose. v. Cut two 35.5 cm lengths of Bev-a-line tubing and connect the upper manifolds to the Y fitting with each length of tubing. For an eight port model use one length of tubing to connect the upper right hand manifold to the OUT hose. b. Method 2: If dedicating a port to vent chamber exhaust and supply air to the auxiliary pump is undesirable, the supply/exhaust lines can be routed out of the LI-850 by leaving the case open. If using this method, a filter (part #30-089) should be added before the pump inlet. Constructing chambers Flasks can be constructed from any gas tight containers, provided they meet the volume considerations discussed above and can be fit with connections for the LI-850. Be careful with plastic containers as sorption of water vapor (and possibly CO 2 ) by the container may affect the measured fluxes. Here we describe how to use.89 L glass canning jars (Ball Corporation, Daleville, IN) as sample chambers.. With the lid removed from the jar, drill one 2 mm hole off center in the lid. Drill two 8 mm holes on
7 7 Soil temperature thermistor Female quick-connect bulkhead ( ) Seal washer Male quick-connect bulkhead ( ) Rubber grommet ( ) Figure 9. Mason jar lid fitted with plumbing connections and a soil temperature thermistor. Two 8 mm holes are drilled in the lid to install the quick connect bulkheads and a 2 mm hole is drilled to install the grommet for the thermistor. either side of the lid, evenly spaced between the larger hole and the edge of the lid (Figure 9). 2. Place a seal washer (part # ) on the threaded portion of a female quick-connect bulkhead fitting (part # ) and install it in one of the 8 mm holes using the nut and washer provided with the fitting. Repeat this procedure for the other 8 mm hole using a male quick-connect bulkhead fitting (part # ) (Figure ). 3. Insert a rubber grommet (part # ) into the 2 mm hole. 4. Gently push a soil temperature thermistor (part # ) through the hole in the grommet and then pull back slightly to seal it. A small amount of silicone grease (part # ) can be used to ease insertion of the thermistor. To get a good seal the grommet should fit tightly in the hole and against the thermistor. 5. Two sections of Bev-a-line tubing are required to connect each chamber to the LI-850. Cut the sections to the desired length and fit one end of each tube with a female quick-connect (part # ) and the other end with a male quick-connect (part # ). 6. Measure and record the length of each tube. This information is very important and will be required later when the chamber volume is entered for use in the flux calculations. 7. Attach the tubes to the fixtures on the lid of each flask, and then to the selected port on the LI All ports that are not connected to a chamber, or used to supply/vent air from the flasks should remain capped with the black plastic caps supplied with the LI-850. If these have been misplaced, replacement caps can be ordered from LI-COR using part # and One of each will be needed for every unused port. Powering the system The AC Power Supply can be used to supply power to the LI-850 and LI-800A, as well as the auxiliary pump used for continuously flushing the flasks. The is capable of providing up to 4.5 Amps at 2 VDC. When the auxiliary pump is installed as described in this application note the input voltage to the LI-850 should not exceed a nominal 2VDC. Software Setup There are some software configuration changes that must be made to use the LI-850 and LI-800A for multiplexed flask measurements. The bulk of these changes are made under the Chamber tab of the Multiplexer Configuration window and relate to defining the appropriate volumes and areas for the flux calculations.. Under the Setup drop down menu in the main LI-800A Windows interface software window, select Measurement Configuration (Figure 0). 2. Select Port Setup from the Multiplexer Configuration window. 3. In the Chamber tab, select Custom from the Chamber: drop-down menu and enter the chamber volume in cubic centimeters. Be sure to include the volume of the tubing used to connect the flask to the LI-850 in the chamber volume. 4. Make sure the closed signal check box is unchecked and that the chamber offset is set to zero. 5. Select the chamber air temperature source from the Temp Source dropdown menu. If the temperature source is measured by a different port, skip this and recompute with the correct temperature later. If measurements are made at near ambient temperatures a measurement of chamber air temperature may not be required. To calculate the volume of Bev-a-line IV, multiply the length of tubing used (in centimeters) by This will give volume in cm 3.
8 8 Select Setup, then Measurement Configuration to access the Multiplexer Configuration window Select Custom from the Chamber pulldown menu, and enter the chamber volume, including hoses Uncheck this box, as the flask will not be providing a closed signal Select the source of the chamber air temperature measurement. If the source is measured on a different port, leave this set to Chamber For the Soil Area (cm 2 ) field, enter the mass or area for which the fluxes will be calculated. For a mass-based flux, enter the mass in decigrams to get a flux in µmol kg - s - Chamber Offset (cm) will always be zero Figure 0. Software configuration for connecting a flask to the LI-850. In this example port has been configured for a.89 L flask connected by two one meter sections of Bev-a-line tubing, and containing a g orange. Chamber air temperature was measured with a thermistor connected to V2. A volume correction can be made for the sample volume by entering a negative value for Extension Tube Volume (cm 3 ). 6. Soil Area (cm 3 ) is where the sample area or mass is entered, depending on what basis fluxes will be calculated on. If a mass is entered in decigrams the final computed flux values will be in μmol kg - s -, though they will still be labeled with the units μmol m -2 s Extension Tube Volume (cm 3 ) can be used to make a correction for the flask volume occupied by the sample by entering the sample volume here as a negative number. 8. Under the Observation tab, Observation Delay and Purge Time should both be set to zero. While the flasks are continuously being purged between measurements, this is not the same as the purge time set in the software and is not under control of the LI-800A. The values entered for the Deadband and Observation Length will be contingent on measurement conditions. Typically at moderate flux rates an observation length of two or three minutes works well. The deadband will depend on flask geometery and the flow rate during measurement, as well as the final CO 2 concentration from the previous measurement, as there is some chamber-tochamber carry over; see the LI-800A Automated Soil CO 2 Flux System and LI-850 Multiplexer Instruction Manual for determining an appropriate deadband length. Keep in mind that the observation length includes the deadband period. 9. The settings under Data Logging, V2, V3, and V4 will be contingent on the experimental setup. Refer to the LI-800A Automated Soil CO 2 Flux System and LI-850 Multiplexer Instruction Manual for information about setting the parameters under these tabs. 0. Repeat steps three through nine for all ports where a chamber is connected.. Select Port Sequence from the Multiplexer Configuration window and define the order in which the flasks will be sampled. 2. Select Repeat from the Multiplexer Configuration window and define the sampling frequency. 3. The instrument configuration can be saved from the Presets window.
9 9 A measurement example using a twelve flask system A twelve flask system was constructed following the methods outlined above and used to measure CO 2 efflux from navel oranges. Flask air temperature was monitored during the measurements with an soil temperature thermistor installed in each flask as described above. Fluxes were calculated on a fresh weight basis and a volume correction was used to account for the flask volume occupied by the fruit. The flux measurements were made over a 3 minute period (observation length = 3 min). Due to significant carryover of CO 2 from one flask to the next (Figures and 2) the first 60 seconds of each measurement were ignored in the flux calculations (deadband = 60 sec). Flux (µmol kg - s - ) A. Chamber CO 2 concentration (µmol mol - ) Time (seconds) Figure. Chamber CO 2 mole fraction during measurement of navel orange respiration. Data shown are for one flask over one three minute measurement. The initial decrease in CO 2 mole fraction is due to mixing of the high mole fraction air trapped in the measurement loop from the previous measurement with the air in the flask. Flux (µmol kg - s - ) 9:30 :30 B. 3:30 5:30 7:30 9:30 2:30 23:30 :30 Time of Day Time of Day 3:30 5:30 7:30 9:30 Chamber Temp. ( C) dc/dt (µmol mol - s - ) Flux (µmol kg - s - ) C. Deadband length (seconds) Chamber Temp. ( C) Figure 2. The change in CO 2 mole fraction with time calculated for various deadband lengths using the data shown in Figure 3. dc/dt is calculated as the slope of a straight line fit to the CO 2 mole fractions. Due to carryover of CO 2 in the measurement loop, an appropriate estimate of dc/dt cannot be made without excluding the first 60 seconds of data. Figure 3. Navel orange respiration measured with a multiplexed flask system. A. Respiration rates for ten oranges measured over a 24 hour period. The number given for each symbol indicates the port where the flask was connected. B. The fluxes for port 2 (solid circles) plotted with chamber airtemperature (open circles). C. The fluxes shown in panel B plotted as a function of temperature.
10 0 In total, ten navel oranges were monitored over a 24 hour time course. Flux rates were similar for all ten oranges measured with the multiplexed flask system, as shown in panel A of Figure 3. The rates declined steadily throughout the measurement period for all samples, and tracked a decline in chamber air temperature (Figure 3B). The decrease in respiration rate was well correlated (r 2 = ) with chamber air temperature over the measurement period (Figure 3C), and is likely due to decreased metabolic activity within the fruit as it cooled (based on chamber air temperature Q 0 =7.8). Conclusions The LI-850 multiplexer is a highly adaptable instrument. When configured for multiplexed flask measurements it provides a means of rapidly sampling CO 2 fluxes from multiple samples, and tracking fluxes over long time courses. While in the example shown we monitored respiration of detached fruit, similar systems have been applied in monitoring insect respiration (Nestel et al. 2007), respiration of isolated soil samples (Jones and Kielland 2002, Haney et al. 2008), and monitoring carbon fluxes from attached leaves and fruit (Araki et al. 998, Kitano et al. 997). References Araki, T., M. Kitano, M. Hamakoga, and H. Egughi Analysis of growth, water balance and respiration of tomato fruits under water deficit by using a multiple chamber system. Biotronics 27:6-68. Haney, R., W. Brinton, and E. Evans Soil CO 2 respiration: Comparison of chemical titration, CO 2 IRGA analysis and the Solvita gel system. Renewable Agri. And Food Sys. 23:7-76. Jones, D. and K. Kielland Soil amino acid turnover dominates the nitrogen flux in permafrost-dominated taiga forest soils. Soil Bio. & Biochem. 34: Kitano, M., T. Araki, M. Hamakoga and H. Eguchi On-line measurements of CO 2 and H 2 O gas fluxes, sap flux and expansive growth in an intact tomato fruit. Biotronics 26: Nestel, D., E. Nemny-Lavy and V. Alchanatis Gasexchange patterns of Mediterranean fruit fly pupae (Diptera: Tephritidae): a tool to forecast developmental stage. Florida Entomologist 90:7-79. Figure 4. Multiplexed flask system as described in this document. Note that the LI-800A Analyzer Control Unit is required, as well, but not pictured above.
11 Appendix: A list of parts available from LI-COR used to construct a multiplexed flask system Description LI-850 Multiplexer LI-800A Analyzer Control Unit AC to DC Power supply Chamber sensor interface LI-COR Part number LI or LI LI-800A Quantity One per flask or one for every three Soil temperature thermistors 2 Soil temperature thermistor Flask Sampling Kit Rubber grommet Silicone grease Diaphragm pump These items included with either Flask Sampling Kit Flask pump power cable Pump mounting plate #6-32 x 3/8" Hex cap screw Bev-a-line tubing (5m) Male quick connect Female quick connect Quick-conn couple bulkhead Quick-conn plug bulkhead Seal washer Quick connect elbow (/8 NPT) Quick connect elbow Quick connect Y Quick connect straight union One per flask or (includes all items below) One per flask Two to four Two per flask Two per flask One per flask One per flask Two per flask One if modifying an LI Two if modifying an LI-850-8, or three if modifying an LI Two if modifying an LI and venting the exhaust through one of the ports. Three if modifying an LI and venting the exhaust through one of the ports. Two are included with the pump. Quick connect plug Two if using a port to supply ambient air and vent exhaust. Filter One if not using a port to supply ambient air. 2 Three soil temperature thermistors can be measured by a single chamber sensor interface, but the temperature data will have to be linked to the correct chamber in post processing. There will also be a time delay between the flux and temperature measurement equal to the observation length times the number of ports between where the sensor interface box is connected and where the flask containing the thermistor is connected.
12 LI-COR Biosciences - Global Headquarters 4647 Superior Street Lincoln, Nebraska Phone: Toll free: Fax: envsales@licor.com envsupport@licor.com Regional Offices LI-COR GmbH, Germany Serving Andorra, Albania, Cyprus, Estonia, Germany, Iceland, Latvia, Lithuania, Liechtenstein, Malta, Moldova, Monaco, San Marino, Ukraine, and Vatican City. LI-COR Biosciences GmbH Siemensstraße 25A 6352 Bad Homburg, Germany Phone: +49 (0) Fax: +49 (0) envsales-gmbh@licor.com envsupport-gmbh@licor.com LI-COR Ltd., United Kingdom Serving Denmark, Finland, Ireland, Norway, Sweden, and UK. LI-COR Biosciences UK Ltd. St. John s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) Fax: +44 (0) envsales-uk@licor.com envsupport-uk@licor.com 205, LI-COR, Inc. LI-COR is a registered trademark of LI-COR, Inc. All other trademarks belong to their respective owners , Rev. 2, 7/5 Printed in USA.
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