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
AP200 CR1000 Program v.2.01 (31.3 KB) 12-01-2021
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.2.30 (46.9 MB) 02-10-2024
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: 53
Expand AllCollapse All
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A dewpoint generator is used as an H2O standard. Dewpoint generators are laboratory instruments and are not suitable for long-term deployment in the field.
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The automatic zero/span function of the AP200 is designed to do both a zero and a CO2 span. However, it is possible to disable the CO2 span and do only a zero. To do this, set public variable CO2_SPAN_PPM =0.
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Configure the AP200 to set the zero and CO2 span. This will provide better accuracy than simply measuring the zero and span tanks and doing a correction in post-processing.
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Possibly. For example, to measure advection because of a drainage flow on sloping terrain, an AP200 system could be deployed with two towers, upstream and downstream along the slope, with four intakes on each tower.
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The AP200 uses ¼ in. tube fittings. Tubing with a 6 mm outer diameter (OD) will not fit, unless a 6 mm to ¼ in. reducer is used on each end of each tube.
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The AP200 has two power input terminals that are individually diode protected. Connect one power system to each terminal.
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The LI-840A does not require any routine maintenance if it is used as described in the AP200 and LI-840A manuals.
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No. If the LI-840A requires repair or recalibration, return it to LI-COR.
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The largest source of error in the LI-840A is CO2 and H2O zero (offset) drift with time and temperature. If it is not practical to do a span, it is still very helpful to do a zero; this is true for both CO2 and H2O.
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If the dewpoint generator is already stable, and a short piece of Bevaline tubing is used to connect it to the AP200, then it should only take a few minutes for the H2O reading to stabilize.
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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