CFX-2CFX-2 Soil COSoil CO 22 Flux SystemFlux System

An open system for accurate measurement
of soil CO 2 flux
CFX-2
Flux System
Soil CO 2
For over 20 years, PP Systems has
been manufacturing high quality
instrumentation for researchers worldwide.
The CFX-2 system is suitable for
unattended operation in the field and
designed to give accurate measurement
of soil net CO 2 flux. It is an "Open
System" where the measurements are
based on concentration differences
between air entering and leaving the
chamber and the flow rate. The
chamber is designed to minimize the
internal over-pressure to such a degree
that normal soil-atmosphere exchanges
are maintained. It also has an integral
stainless steel ring to provide a good
seal with the soil surface.
System Features
• Stand-alone operation
• Lightweight and field portable
• Accurate, integral CO 2 analyzer and
H 2 O sensor
• Open system measurement
• User friendly operation
• Simple setup
• Full data logging, storage and output
of data
The Control Interface Module (CIM)
includes an integrated CO 2 /H 2 O analyzer,
a mass flow controlled air supply providing
100 l/min of ambient air to an opaque
chamber, datalogging/storage capability
and keyboard for setting up the system
and retrieval of stored data.
Close-up view of the Control Interface
Module (CIM)
Data Sheet

Technical Specifications
For Further Information, Please
Contact Us At:
North America
PP Systems
110 Haverhill Rd., Suite 301
Amesbury, MA 01913 U.S.A.
Tel: +1 978-834-0505
Fax: +1 978-834-0545
Europe
PP Systems
Unit 2, Glovers Court
Bury Mead Rd.
Hitchin, Herts SG5 1RT UK
Tel: +44 1462-453411
Fax: +44 1462-431090
Email: sales@ppsystems.com
URL: www.ppsystems.com
08/14/06
Analysis Method
Non-dispersive infrared, configured as an
absolute absorptiometer with microprocessor
control of linearization.
Measurement Range
CO 2 : 0-2,000 ppm (µmol mol -1 )
H 2 O: 0-100%
Measurements are automatically corrected for
temperature and pressure.
Accuracy
CO 2 : Better than 1% of span concentration
over the calibrated range, but limited by the
accuracy of the calibration gas mixture.
H 2 O: 2%
Linearity
Better than 1.0% throughout the range.
Stability
Automatic Zero at regular intervals, corrects
for sample cell contamination, source and
detector ageing and pre-amplifier gain
changes.
Sampling Pump
Integral DC pump.
Air Filter
Filtered sample line (hydrophobic).
Calibration
Default value preset in factory (built-in initialization).
Automatic calibration by keypad if
required.
Real Time Clock
Accuracy > 1 minute per month at 25 o C,
operating temperature 0-70 o C. Automatic
correction for month end and leap years.
Recording
Manual (by keypress) or automatic at user
selected intervals between 1 and 250 minutes.
Data Storage
512K Battery backed RAM (1,000 records).
Environmental Sensor Interface
Input available for use with the CFX-2 Soil
Respiration Chamber.
Digital (RS232) Output
9600 baud/8 data bits, 1 start bit/2 stop bits/
no parity. ASCII format.
Display
High contrast 2 x 16 character LCD.
Power Supply
External 12V DC (User supplied)
Gas Connections
Two gas ports (Reference/Chamber) for use
with 1/8” (.125) ID tubing.
Housing
High impact, IP65 enclosure with handle.
Dimensions
Control Interface Module:
25.5 cm (H) x 9 cm (D) x 18 cm (W)
Air Supply Chimney:
63 cm (H) x 5.5 cm (D)
CFX-2 Soil Respiration Chamber:
20 cm (Diameter) x 12 cm (Height)
Surface Area: Approx. 350 cm 2
Weight
Control Interface Module:
2.8 kg. (including chimney)
CFX-2 Soil Respiration Chamber:
1.7 kg.
Optional Accessory
CFX Soil Temperature Probe
PP Systems is continuously updating its
products and reserves the right to amend
product specifications without notice.