Preprogrammed and low power
Overview
The AP200 is a complete, integrated CO2 and H2O atmospheric profile system. It measures carbon dioxide (CO2) and water vapor (H2O) concentration from up to eight intakes, which are normally spaced along the height of a tower to give a vertical profile. The AP200 is often used in conjunction with an eddy-covariance system to measure the storage term and provide you with a more complete measure of the surface gas exchange.
Read MoreBenefits and Features
- Fully integrated system
- Requires only 13 W (average at 25°C and 12 Vdc)
- Contains a Campbell Scientific CR1000X Measurement and Control Datalogger
- Automatically performs CO2 zero and span
- Automated temperature and pressure control
- Data logger program included
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Detailed Description
Measurements
Primary:
- CO2 concentration at each intake
- H2O concentration at each intake
- System diagnostic word
Secondary:
- Sample flow rate
- Sample cell pressure
- Sample cell temperature
- Other control variables
Note: Contact the Micromet Group at Campbell Scientific for questions or updates regarding the data logger program.
Specifications
System Enclosure |
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| Operating Temperature | -30° to +45°C |
| Power Requirements |
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| Dimensions | 52.1 x 44.5 x 29.7 cm (20.5 x 17.5 x 11.7 in.) |
| Weight |
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Pump Module |
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| Pump Type | Dual-head diaphragm pump with a brushless dc motor |
| Mounting | Mounted in an insulated, temperature-controlled box inside system enclosure |
| Control | Pumping speed is automatically controlled to maintain the pump inlet pressure at the set point |
| Maximum Pumping Speed | 9.0 liters per minute (LPM) |
| Pressure Sensor Range | 15.0 to 115.0 kPa |
| Heater | 8.0 W (turns on/off at 2°C) |
| Warm-up Time | ~50 min (from -30° to +2°C) |
| Fan | 0.7 W (turns on at 50°C and off at 45°C) |
Valve Manifold |
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| Mounting | Mounted inside system enclosure |
| Inlets | Eight air sample inlets plus one inlet for zero, one inlet for CO2 span, and one inlet for H2O span |
| Connections | 0.25-in Swagelok |
| Mass Flow Sensor | 0 to 1.0 standard liters per minute (SLPM) |
| Heater | 8.0 W (turns on/off at 5°C) |
| Warm-up Time | ~20 min (from -30° to +4°C) |
| Fan | 0.7 W (turns on at 45°C and off at 43°C) |
Intake Assembly |
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| Filter | 1.0-in diameter, sintered stainless-steel disk filter, 10-micron pore size |
| Orifice Heater | 2 kohm (0.07 W at 12 Vdc) |
| Mixing Volume | 750 mL |
| Sample Connection | 0.25 in. Swagelok |
| Number of Connections for Heater Cable Entry Seals | 3 (1 in, 2 out) |
| Cable Diameter for Heater Cable Entry Seals | 2.8 to 6.6 mm (0.11 to 0.26 in.) |
| Wire Diameter for Heater Cable Screw Terminals | 26 to 12 AWG |
| Wire Stripping Length for Heater Cable Screw Terminals | 5.0 mm (0.2 in.) |
| Screw Tightening Torque for Heater Cable Screw Terminals | 0.4 N•m |
| Orifice Inside Diameter | 0.178 mm (0.007 in.) |
| Dimensions | 31 x 12.5 x 19 cm (12 x 5 x 7.5 in.) |
| Weight | 1.4 kg (3.1 lb) |
Documents
Brochures
Miscellaneous
Downloads
If a download of the full version of purchased software is needed, use the same account made for the purchase and navigate to the account's Purchased Software section.
AP200 CR1000 Program v.2.01 (31.3 KB) 01-12-2021
AP200 CR1000(X) Program.
Compatible with the LI-850.
Note: For those with the LI-840 contact Campbell Scientific for compatible code.
Device Configuration Utility v.2.33 (49.6 MB) 07-07-2025
A software utility used to download operating systems and set up Campbell Scientific hardware. Also will update PakBus Graph and the Network Planner if they have been installed previously by another Campbell Scientific software package.
Supported Operating Systems:
Windows 11 or 10 (Both 32 and 64 bit)
Frequently Asked Questions
Number of FAQs related to AP200: 42
Expand AllCollapse All
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It depends on the type of chambers. The AP200 requires a constant flow of sample air for each intake, so it will not work with small chambers that require the air sample to recirculate. However, it might be possible to use the AP200 with chambers that allow a continuous sample flow to be extracted.
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No. The AP200 requires flow from at least four intake assemblies for smooth operation of the pump.
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No. Because the AP200 has only eight inlets for air samples, it can only operate with a maximum of eight intake assemblies.
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This depends on the site. Replace the filters when the sample intake flow is 75% of the flow with clean filters. As an example, long-term testing in Logan, UT, shows that filters need to be changed about once per year. If the air at a site is dirtier, then the filters will need to be replaced more often.
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No. The AP200 is designed to work only with an LI-840 or an LI-840A. These analyzers give more accurate measurements of the CO2 concentration because they allow the dilution by water vapor to be taken into account.
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The AP200 supports automatic zero/span from once per day to once each averaging period (typically 30 minutes). A zero/span once a day will mitigate zero/span drift caused by seasonal temperature changes and long-term drift in the IRGA. More frequent zero/span (hourly) will also correct for any small drift associated with 24 hour temperature swings.
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The CO2 span is done in terms of the concentration, which does not change with pressure. Zero air has no CO2 or H2O, so pressure has no effect.
In contrast, the H2O span is done in terms of the dewpoint, which does depend on pressure. The dewpoint generator pushes an air stream at ambient pressure, saturated at the dewpoint temperature setting, to the AP200 inlet. The AP200 pulls a subsample of this air stream into the IRGA at low pressure. Changing the pressure does not change the concentration of H2O, but it does change the dewpoint. Because of this pressure change, the AP200 must calculate the dewpoint in the sample cell (at the reduced pressure). To do this calculation, the AP200 must know the ambient pressure (pressure in the dewpoint generator) and the pressure in the sample cell. The equations for these calculations are provided in Appendix I of the AP200 Instruction Manual.
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Yes. Contact Campbell Scientific for a quote to have an application engineer install the system.
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The intake tubes can be quite long—up to a few hundred meters. Contact Campbell Scientific to ask about specific requirements for an application.
Case Studies
This case study discusses the integration of CPEC310 and AP200 systems to explore the theories......read more
The Warra long-term ecological research (LTER) site located in Southwestern Tasmania was founded in 1995......read more
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