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

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.

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Benefits 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

Images

<dl><dt>Typical AP200 Installation</dt> <dd>1-27693 Heated Sample Intake Assemblies (from 4 up to 8)</dd> <dd>2-9922 20 AWG Power Cable</dd> <dd>3-28547 AP200 System Enclosure</dd> <dd>4-15702 Tubing</dd> <dd>5-Zero/Span Tanks and Regulators (not included)</dd> <dd>6-Instrument Tower (sold separately)</dd></dl>

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
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-850
  • 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.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.

View Update History

Device Configuration Utility v.2.30 (46.9 MB) 10-02-2024

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)

View Update History

Frequently Asked Questions

Number of FAQs related to AP200: 53

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  1. Why is the AP200 not able to do an automated H2O span?

    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.

  2. Is it possible to order an AP200 with just two intake assemblies?
    No. The AP200 requires flow from at least four intake assemblies for smooth operation of the pump.
  3. When the pump for the AP200 or CPEC200 wears out, can it be repaired, or does it need to be replaced?

    If the pump fails, it must be replaced. Contact Campbell Scientific for details. For the process of returning equipment to Campbell Scientific, refer to the Repair and Calibration page.

  4. If the IRGA needs recalibration, should it be sent to Campbell Scientific?
    No. If the LI-840A requires repair or recalibration, return it to LI-COR.
  5. Should the AP200 set the IRGA zero/span or just measure the zero/span?
    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.
  6. If it is OK not to do an automated H2O span, is it OK not to do an automated CO2 span?

    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.

  7. How long does it take for the reading to stabilize during an H2O span?
    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.
  8. Can someone from Campbell Scientific come to a site and install an AP200 system?
    Yes. Contact Campbell Scientific for a quote to have an application engineer install the system.
  9. Are the intake heaters of the AP200 wired in series or in parallel?

    The intake heaters are wired in parallel, so that each heater sees a nominal 12 Vdc.

  10. Why does the AP200 system use so much power at lower temperatures?

    The LI-840A uses a heater to maintain its sample cell at +50°C. Therefore, it consumes a lot more power at lower temperatures. Below 0°C, the valve heater also requires some power to keep the valves warm.

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Case Studies

china: flux cooperation
China: Flux Cooperation
This case study discusses the integration of CPEC310 and AP200 systems to explore the theories......read more
australia: ecological research
Australia: Ecological Research
The Warra long-term ecological research (LTER) site located in Southwestern Tasmania was founded in 1995......read more
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