A closed system for accurate measurement of soil CO2 flux For over 20 years, PP Systems has been System Features manufacturing high quality instrumentation • Lightweight and field portable for researchers worldwide. The method of • measuring soil respiration is that Accurate, integral CO2 analyzer and H described by Dr. K.J. Parkinson in 1981, 2O sensor (Optional) where a chamber of known volume is • Closed system measurement placed on the soil and the rate of increase • in CO User friendly operation 2 within the chamber is monitored. Flux System In the original method, air samples were • Simple setup withdrawn at one minute intervals and • Full data logging, storage and output separately analyzed. With this system, the SRC-1 of data 2 air is continuously sampled in a closed circuit through the EGM-4, and the soil respiration rate is calculated, displayed and recorded by the instrument. The air within the chamber is carefully mixed to ensure representative sampling without generating pressure differences which would affect the evolution of CO2 from the soil surface. An optional STP-1 Soil Temperature Soil CO Probe is also available if required. It is suitable for static temperature measurements where a robust unit is required. The sensor is mounted in the tip of a stainless steel tube and protected by a stainless steel cap. Optional STP-1 Soil Temperature Probe Data Sheet Technical Specifications EGM-4 Environmental Gas Monitor Gas Connections Two gas ports (inlet and exhaust) for use with 1/8” (.125) ID tubing. Analysis Method Non-dispersive infrared, configured as an absolute Housing absorptiometer with microprocessor control of For Further Information, Please High impact, aluminum enclosure. linearization. Contact Us At: Dimensions Measurement Range 18 cm (W) x 21.5 cm (H) x 6.3 cm (D) CO North America 2: 0-2,000 ppm (µmol mol-1) Weight Measurements are automatically corrected for tem-1.5 kg. (including battery). PP Systems perature and pressure. 110 Haverhill Rd., Suite 301 Accuracy SRC-1 Soil Respiration Chamber Amesbury, MA 01913 U.S.A. Better than 1.0% (limited by calibration gas mixture) Chamber Construction Linearity Rugged PVC with stainless steel ring. Tel: +1 978-834-0505 Better than 1.0% throughout the range. Fax: +1 978-834-0545 Measurement Range Stability Automatic Zero at regular intervals, corrects for sam-0-9.99 g CO2 m2 hour Europe ple cell contamination, source and detector ageing and pre-amplifier gain changes. Fan 12V DC PP Systems Sampling Pump Integral DC pump. Dimensions Unit 2, Glovers Court 15 cm (H) x 10 cm (D) -excluding handle. Bury Mead Rd. Air Filter Hitchin, Herts SG5 1RT UK Filtered sample line (hydrophobic). Weight 0.9 kg. Calibration Tel: +44 1462-453411 Default value preset in factory (built-in initialization). STP-1 Soil Temperature Probe Automatic calibration by keypad if required. Fax: +44 1462-431090 (Optional) CO2 Control Probe Construction Email: sales@ppsystems.com High and low set points. Electronics housed in anodized aluminum with stainless steel tip (sensor housing). Alarm URL: www.ppsystems.com Audio alarm Connector 1 Meter cable fitted with appropriate connector Real Time Clock Accuracy > 1 minute per month at 25o C, operating Power Supply 7-12V DC @ 33 mA temperature 0-70o C. Automatic correction for month end and leap years. Measurement Range 0-50o C Recording Manual (by keypress) or automatic at user selected Accuracy intervals between 1 and 250 minutes. 0.5o C Data Storage 512K Battery backed RAM (1,000 records). Output 0-1V Response Time Display/Analog Output: 1.6 seconds Dimensions 40 cm (L) x 1.9 cm (D) - excluding handle. Environmental Sensor Interface Input available for use with external sensors (%RH, Weight Temperature, PAR, etc.). 0.2 kg. Analog Output 02/18/05 4-20 mA, 0-1V, 0-2V, 0-3V, 0-4V, 0-5V (Linear). Optional Accessories Humidity Sensor Digital (RS232) Output 9600 baud/8 data bits, 1 start bit/2 stop bits/ no parity. ASCII format. Display PP Systems is continuously updating its products High contrast 2 x 16 character LCD. and reserves the right to amend product specifica-tions without notice. Power Supply 12V, 2.0 Ah rechargeable lead acid battery. Up to 4 hours continuoius operation. Longer times possible with external 12V battery. Optional 12V NiMH Battery for longer operation in the field.