AP200 CO2/H2O Atmospheric Profile System
Complete, Integrated System
Preprogrammed and low power
weather applications supported water applications supported energy applications supported gas flux & turbulence applications supported infrastructure applications supported soil applications supported

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 give a more complete measure of the surface gas exchange.

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Benefits and Features

  • Fully integrated system
  • Requires less than 20 W—can be solar-powered
  • Contains a Campbell Scientific CR1000 Measurement and Control Data Logger
  • Automated zero and span
  • Automated temperature and pressure control
  • Data logger program included

Images

Technical 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 a Campbell Scientific applications engineer from the micromet group for questions or updates regarding the datalogger program.

Specifications

System Enclosure

Operating Temperature -30° to +45°C
Power Requirements
  • 10 to 16 Vdc (voltage)
  • 13 W (average power at 25°C)
    Average power varies from 12.5 W above +35°C to 22.5 W at -30°C.
  • 3.75 A (45 W) maximum power (cold startup)
Dimensions 52.1 x 44.5 x 29.7 cm (20.5 x 17.5 x 11.7 in.)
Weight
  • 15.9 kg (35 lb) for AP200 base model
  • 1 kg (2.3 lb) for LI-840A
  • 272 g (10 oz) for CR1000KD
  • 154 g (5.4 oz) for CFM100/NL116

Pump Module

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

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

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)

Downloads

AP200 CR1000 Program v.1.3 (15.7 KB) 07-10-2014

AP200 CR1000 Program.

CR1000 OS v.32.03 (5.10 MB) 13-08-2018

Execution of this download installs the CR1000 Operating System and Compiler on your computer.  It also updates the CR1000 support files for the CRBasic Editor.  

Note: This OS has crossed the 2 Meg CR1000 size limit for remote download.  The OS must be downloaded to the 2 Meg CR1000 via direct connect with the Device Configuration Utility.  All OS download methods are supported by the 4 Meg CR1000.

Upgrading from versions prior to version 28 of the Operating System will reset the datalogger’s CPU drive.  This is due to a change in the format of the file system from FAT16 to FAT32.  In order for the datalogger to operate correctly, as part of the upgrade, the CPU drive is formatted to FAT32.  Any programs stored and running from the CPU drive will be lost.  It is not recommended to update the datalogger’s Operating System over a remote connection where program control regulates the communication equipment (turning it on or off, etc.).  In these cases, an on-site visit and a backup using DevConfig’s backup utility is necessary to update the datalogger’s Operating System.

Watch the Video Tutorial: Sending an OS to a Local Datalogger.

In all cases where the datalogger is being updated from an Operating System prior to 28, the use of DevConfig’s backup utility is recommended due to the CPU drive being formatted using the new FAT32 format.

View Revision History

Device Configuration Utility v.2.19 (33.2 MB) 06-12-2018

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 10, 8.1, 8, and 7 (Both 32 and 64 bit)

View Revision History

Related FAQs

Number of FAQs related to AP200: 52

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  1. Yes. Contact Campbell Scientific for a quote to have an application engineer install the system.
  2. No. Because the AP200 has only eight inlets for air samples, it can only operate with a maximum of eight intake assemblies.
  3. 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.

  4. A non-zero value can be used to perform a zero/span on an interval that is not synchronized to midnight (for example, every three hours starting at 0100 hrs).

  5. The AP200 has two power input terminals that are individually diode protected. Connect one power system to each terminal.
  6. The spacing depends on the canopy and atmospheric conditions. It is important to know where the concentration gradients are the steepest.

    For example, in a low agricultural crop canopy, it may be appropriate to use a logarithmic distribution within and near the top of the canopy, and a linear distribution above the canopy: 0.2 m, 0.4 m, 0.8 m, 1.6 m, 3.2 m (logarithmic) and 5 m, 7 m, 9 m (linear).

  7. The LI-840A does not require any routine maintenance if it is used as described in the AP200 and LI-840A manuals.

  8. 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.
  9. 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.

Case Studies

Tasmania: Ecological Research
The Warra long-term ecological research (LTER) site located in Southwestern Tasmania was founded in 1995 to monitor......read more
Tasmania: Ecological Research
The Warra long-term ecological research (LTER) site located in Southwestern Tasmania was founded in 1995 to monitor......read more

Articles and Press Releases