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.
Benefits and Features
- Fully integrated system
- Requires only 13 W (average at 25°C and 12 Vdc)
- Contains a Campbell Scientific CR1000 Measurement and Control Datalogger
- Automated zero and span
- Automated temperature and pressure control
- Datalogger program included
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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
AP200 Specifications
System Enclosure
- Operating Temperature: -30° to 45°C
- Dimensions:
52.1 x 44.5 x 29.7 cm
(20.5 x 17.5 x 11.7 in.)
- Weight
AP200 base model: 15.9 kg (35 lb)
LI-840A: 1 kg (2.3 lb)
CR1000KD: 0.3 kg (0.7 lb)
CFM100/NL115: 0.2 kg (0.4 lb)
- Power Requirement:
Voltage: 10 to 16 Vdc
Average Power (at 25°C)1: 13 W
Maximum Power (cold startup):
3.75 A (45 W)
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
- Dimensions:
31 x 12.5 x 19 cm
(12 x 5 x 7.5 in.)
- Weight: 1.4 kg (3.1 lb)
- Filter: 1.0-in diameter, sintered stainless steel disk filter, 10-micron pore size, CSI pn 27809
- Orifice Inside Diameter:
0.178 mm (0.007 in.)
- Orifice Heater:
2 kohms (0.07 W at 12 Vdc)
- Mixing Volume: 750 ml
- Sample Connection: 0.25 in. Swagelok
- Heater Cable Entry Seals
Number of connections: 3 (1 in, 2 out)
Cable Diameter: 2.8 to 6.6 mm
(0.11 to 0.26 in)
- Heater cable screw terminals
Wire diameter: 26 to 12 AWG
Wire stripping length: 5.0 mm (0.2 in)
Screw tightening torque: 0.4 N•m
1 - Average power varies from 12.5 W above 35°C to 22.5 W at –30°C.
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