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

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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
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) 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.

View Revision History

Device Configuration Utility v.2.29 (54 MB) 15-11-2023

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 Revision History

Articles and Press Releases

FAQs for

Number of FAQs related to AP200: 53

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  1. Is there a model of the AP200 with 10 intake assemblies?
    No. Because the AP200 has only eight inlets for air samples, it can only operate with a maximum of eight intake assemblies.
  2. Why would CAL_TIMEOFFSET ever be set to a non-zero value?

    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).

  3. 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.

  4. 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.

  5. Where should a sensor that requires 12 Vdc power be connected to on the AP200?
    Adding sensors to the AP200 is not recommended.
  6. How often should the intake filters be changed on an AP200?
    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.
  7. Can the AP200 be used with chambers?
    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.
  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. Can bulk cable be purchased and cut to length in the field?
    Yes. Cutting cable to length and preparing the ends in the field is easy because the connections are either spring-loaded or screw terminals.
  10. How can two independent solar power systems be connected to an AP200 if each system has a lead-acid battery, solar panel, and charger?
    The AP200 has two power input terminals that are individually diode protected. Connect one power system to each terminal.
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