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Enabling better global research outcomes in soil, plant & environmental monitoring.

GFS-3000 Portable Gas Exchange Fluorescence System

The portable GFS-3000 is a high precision system for the assessment of plant photosynthesis (CO2-uptake) or respiration (CO2-release) and transpiration – also in combination with optical measurements.

Gas exchange measurements rely on the basic principle that changes in CO2 and H2O concentrations are determined when air passes through a climate controlled chamber containing a plant sample.

The GFS-3000 is suitable for controlled laboratory settings as well as demanding field conditions.

The GFS-3000 perfectly complements with other Walz systems giving access to numerous aspects of photosynthesis research.

The Portable Gas-Exchange and Fluorescence System GFS-3000 enables wide range climate control. All environmental parameters relevant for plant photosynthesis (CO2, H2O, temperature, light, ventilation and flow) can be controlled automatically and over the full physiological range.

Optional fluorescence modules further expand the system’s capability. Experimental protocols for automatic light-curves or automatic CO2-curves can be easily programmed.

Combining high precision CO2 measurement with modern fluorescence and P700 measurements

Main Components of the Basic System
Package GFS-3000

  Control Unit 3100-C containing the CO2 and H2O analyser, as well as all components required for the CO2, H2O and flow control

  Standard Measuring Head 3010-S featuring high application flexibility containing the ventilation system, temperature and light control

  LED Light Source 3040-L with an LED array providing 90% red and 10% blue light

  AC Power Supply 3020-N for laboratory use

  Two LiFePO4 Battery Units 3035-A for field work and Battery Charger LC-03


Modified System Package GFS-3000FL

The modified system package GFS-3000FL contains the LEDArray/ PAM-Fluorometer 3055-FL instead of the LED Light Source 3040-L. All other components remain the same as in the basic system package GFS-3000. In terms of price, GFS-3000FL offers an interesting option to combine gas exchange and fluorescence measurements.

Optional Components and Accessories
of the GFS-3000

  LED-Array/PAM-Fluorometer 3055-FL for illumination of the leaf area and fluorescence measurements

  Fiberoptics PAM-Fluorometer 3050-F to analyse fluorescence in sunlight

  Miscellaneous accessories such as cuvettes and adapter plates offering user-specific application options

  Accessories for product combinations with other Walz systems

Also, the complete equipment will be modified on customer request.

Control Unit 3100-C

Design: Aluminium housing featuring an integrated PC module, large graphical colour-display well readable in sunlight with touch screen, 4-channel CO2/H2O gas analyser, flow control, CO2 control (supplied via small cartridges or cylinders) and H2O control (for drying and humidifying). Pneumatic connectors for air inlet, measuring head and four vents. Sockets for cable connections: Cuvette: Standard Measuring Head 3010-S, DUAL-PAM Gas-Exchange Cuvette 3010-DUAL or Gas-Exchange Chamber 3010-GWK1; Aux in: two Auxiliaries; Comp (RS 485): additional component; USB (USB 2.0): USB storage device, USB null modem cable (USB-NMC), or other USB device; Battery DC/in: two LiFePO4 Batteries 3035-A, AC Power Supply Unit 3020-N, or external DC (12-24 V)

CO2/H2O Gas Analyser

Design: 4-channel CO2/H2O absolute NDIR gas analyser, separate cuvettes for CO2 and H2O
CO2 measurement: Simultaneous absolute and differential measurements, absolute range: 0 to 3000 ppm, cuvette length 20 cm, cuvette volume of one cell 6 cm3, gas-filled detector
H2O measurement: Simultaneous absolute and differential measurements, absolute range: 0 to 75000 ppm, cuvette length 20 cm, cuvette volume of one cell 6 cm3, pyroelectric detector (solid state)
Max. noise in absolute mode: <0.2 ppm CO2 and <30 ppm H2O
Resolution: 0.01 ppm CO2, 1 ppm H2O
  • CO2 absolute: Max. error between 0 and 600 ppm: 12 ppm, above 600 ppm: 2% of measured value
  • Deviation of differential CO2 zero with changing CO2: Typ. less than 0.5 ppm
  • H2O absolute: Max. error between 0 and 15000 ppm: 330 ppm, above 15000 ppm: 2% of measured value
  • Deviation of differential H2O zero with changing H2O: Typ. less than 150 ppm
Correction: Signal is corrected for temperature, pressure and H2O-effect on CO2 signal
Barometric air pressure measurement: Range 60 to 110 kPa, accuracy ±0.1%

Other Specifications of the Control Unit 3100-C

Pneumatic time delay: Delay between Analyser and Standard Measuring Head 3010-S is 2.5 s at standard flow rate
Mass flow measurement: Thermal mass flow meter, range 0 to 1500 μmol s-1, accuracy ±1%
Integrated user interface: Panel PC NX800LX/500 MHz with graphical colour-display 640 x 480 dots (effective display area 13 cm x 10 cm) with backlight (well readable in direct sun-light), touch screen, USB 2.0 connector, and audio speaker
Data storage capacity: 4 GB compact flash card
CO2 control: Integrated CO2-control range 0 to 2000 ppm, CO2 supply via CO2 cartridges (8 g CO2, provide more than 48 h continuous supply at 350 ppm, reserve is indicated) or via CO2 cylinder with pressure reducer
H2O control: Integrated H2O control via step motor for humidifying and drying, range 0 to nearly 100% r.h. (non-condensing)
Measured and calculated parameters: CO2 absolute, CO2 difference, H2O absolute, H2O difference, flow, ambient pressure, 2x auxiliaries, cuvette temperature (upper and lower half), leaf temperature, ambient temperature, PAR in upper part of the cuvette, PAR in lower part of the cuvette, external PAR, evaporation, VPD, H2O conductance, net photosynthesis, intercellular CO2 concentration. Recalculation of stored data is possible.
In combination with PAM Fluorometer (GFS-3000FL): Fo, Fm, Fm’, F, Fo’, Fv/Fm (max. PS II quantum yield), ΔF/Fm’ = Y(II) (effective PS II quantum yield), qP, qL, qN, NPQ, Y(NPQ), ETR (i.e. PAR x ΔF/Fm’)
PC interface: USB 2.0
Auxiliaries: Two analogue inputs, range 0 to 4095 mV
Power supply: Field replaceable rechargeable LiFePO4 Battery Units 3035-A 12.8 V / 15 Ah (2x 7.5 Ah), external DC: 12-24 V, AC Power Supply 3020-N for laboratory operation
Operating time: 3 to 4.5 hours typ. with one LiFePO4 Battery Unit 3035-A, 6 to 9 hours typ. with two LiFePO4 Battery Units 3035-A
Operating temperature: -5 to 45°C
Dimensions: 43 cm x 28 cm x 27 cm (L x W x H)
Weight: 12.1 kg (incl. LiFePO4 battery)

AC Power Supply 3020-N

Design: DC power supply unit for laboratory use
Output voltage: 16 V DC
Output power: 135 W
Mains power supply: 100 to 240 V AC, 50/60 Hz
Operating temperature: 0 to 60°C
Dimensions: 20 cm x 8 cm x 5 cm (L x W x H)
Weight: 1 kg

LiFePO4 Battery 3035-A

Design: Mounting plate with GFS-3000 connector plug, containing two electronically separated LiFePO4 batteries placed in parallel, with protection circuit
Nominal voltage: 12.8 V
Typical capacity: 15 Ah (2 x 7.5 Ah)
Operating temperature: -30 to +60°C
Dimensions: 28 cm x 16 cm x 7.5 cm (L x W x H)
Weight: 2.8 kg

Battery Charger LC-03

Design: Mains operated automatic Li-ion or LiFePO4 battery charger (as indicated on the instrument housing) with two independent charge outputs, 2-line LCD with backlight for each charge output.
Charging voltage: 16.4 V max.
Charging current: 0 to 3 A
Recharging time: 6 hours for one or two batteries 3025-A or 3035-A
Mains power supply: 100 to 240 V AC, 50/60 Hz
Operating temperature: -5 to 45°C
Dimensions: 20.5 cm x 19 cm x 9 cm (L x W x H)
Weight: 1.7 kg

Li-ion Battery 14.4 V/ 15 Ah 3025-A

Design: High-performance, maintenance-free, rechargeable Li-ion battery with protection circuit, Perspex-aluminium housing
Nominal voltage: 14.4 V
Typical capacity: 15 Ah
Operating temperature: -10 to +60°C (discharge) and 0 to 50°C (charge)
Dimensions: 28 cm x 15.5 cm x 2.8 cm (L x W x H)
Weight: 1.7 kg

Accessory: Outdoor-Set 3000-CA/OS

Design: 2.5 m fibreglass antenna, antenna holder, 10 l air buffer volume with pneumatic connector air in and air out, luggage net, 27 cm and 3 m hose with pneumatic connectors, 66 cm x 30 cm heat protection sun screen.
Weight: 1.2 kg
  • 3010-GWK1 Gas Exchange Chamber
    The Gas-Exchange Chamber 3010-GWK1 is designed to investigate medium-sized samples like small branches, big leaves, or fruits under well-defined climate controlled conditions. To provide this, the 3010-GWK1 chamber has a highly efficient temperature control, a transversal fan for fast ventilation, and pneumatic connectors for air supply.