PP Systems EGM-4, Operator'S Manual

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Technical Specification
EGM-4 Operator's Manual – Version 4.19
- 8 -
Web Site: http://www.ppsystems.com
Technical Specification
Analysis Method Non-dispersive infrared with microprocessor control and linearisation.
Measurement
Range
(CO
2
)
0-1,000 ppm (µmol mol
-1
)
0-2,000 ppm (µmol mol
-1
)
0-5,000 ppm (µmol mol
-1
)
0-10,000 ppm (µmol mol
-1
)
0-20,000 ppm (µmol mol
-1
)
0-30,000 ppm (µmol mol
-1
)
0-50,000 ppm (µmol mol
-1
)
0-100,000 ppm (µmol mol
-1
)
Measurements are automatically corrected for temperature and pressure.
Accuracy (CO
2
) < 1% of span concentration over the calibrated range, but limited by the
accuracy of the calibration gas mixture.
Linearity < 1% throughout the range.
Stability Automatic Zero at regular intervals. It corrects for sample cell
contamination, source and detector ageing and pre-amplifier gain
changes.
Sample Pump Integral DC pump operating at a flow rate of approximately 350 ml/min.
Pump can be disabled for static measurements on demand.
Gas Flow Rate
Through Analyzer Minimum flow rate: 200 ml/min
Maximum flow rate: 400 ml/min
Environmental
Sensor Interface Two inputs available for use with external sensors (humidity, temperature,
PAR, oxygen, soil respiration, canopy assimilation, etc.).
Air Filter Filtered sample line (hydrophobic)
Calibration Default value preset in factory (Built-in Initialization). Automatic
calibration via keypad if required.
CO
2
Control High and low set points
Alarm Audio Alarm
Real Time Clock Accuracy > 1 minute per month at 25
˚
C, operating temperature 0-70
˚
C.
Automatic correction for month end and leap years.
Recording
Manual (by keypress) or automatic at user selected intervals between 1
and 250 minutes.
Keypad Custom, tactile keypad
Data Storage 512 K Battery backed RAM (1,000 records).
Response Time Display/analog output: 1.6 seconds
Analog Output
(CO
2
only)
4-20 mA, 0-1 V, 0-2 V, 0-3 V, 0-4 V, 0-5 V (Linear)
Digital Output
(RS232) 9600 baud/8 data bits, 1 start bit/2stop bits/no parity
ASCII Format
Display High contrast 2 x 16 character LCD.
Power Supply 12 V, 2.0 Ah Rechargeable Lead Acid Battery providing up to 4 hours
continuous use or 12V NiMH rechargeable battery providing up to 8 hours
continuous use. Longer times available with external 12V battery. Battery
life may be reduced when EGM-4 is used with add-on
sensors/accessories.
Gas Connections Two barbed fittings (inlet and exhaust) for 1/8” (.125”) ID tubing.
Housing High impact, aluminum enclosure.
Operating
Environment -5
o
C – 50
o
C, non-condensing. In dirty or high humidity environments,
external air filtration is required.
Dimensions 18 cm (W) x 21.5 cm (H) x 6.3 cm (D)
Weight 1.9 kg