Specifications for MICRO-PAM ONLINE-Configuration

Measuring Head MICRO-HEAD/3B

General Design

Housing: Polymer housing with optical block and fiber connector on one side, and a combined power line/RS485 socket on the opposite side

MICRO-HEAD/BK Leaf Clip: Consisting of 2 aluminum frames (3.5 x 2.5 cm), held together by magnet, 0.4 cm distance between sample plane of leaf clip and lightguide, angle between sample plane and optical light guide: 60°

Cables: RS 485 data/power cable, 10 m standard length, connecting MICRO-HEAD/3B and MICRO IB4 PC Interface Box. RS 485 adapter cable, 0.6 m long, to connect MICRO-HEAD/3B to optional PC Interface Box MONI IB4/LAN or to optional MONI DA system for data acquisition

Flexible stand: Baseplate of acrylic glass 10 x 10 x 0.5 cm (L x W x H); flexible goose neck consisting of 20 links, 1.7 cm maximum diameter, 30 cm length, one end with metal thread equipped with 1 butterfly nut, 1 nut and 2 washers. Weight 114 g

Dimensions: Complete head with leaf clip, 13.5 x 3.5 x 4 cm (L x W x H)

Power consumption: Peak loads during saturating pulses 3 W. During measuring mode 0.15 W

Operating temperature: -15 to +40 °C

Weight: 96 g

Light Emission

Modulated fluorescence excitation: Blue power LED (typical peak wavelength 460 nm, full width at half maximum 22 nm). Photosynthetically active radiation (PAR) of measuring light at level of the sample clip range from 0.15 to 1.5 μmol m-2 s-1 at low modulation frequencies (5 to 25 Hz), and from 1.5 to 22.5 μmol m-2 s-1 at high modulation frequencies (100 Hz)

Actinic light: Same power LED as for modulated light. At sample level of leaf clip, 3000 μmol m-2 s-1 maximum PAR of actinic light, 8000 μmol m-2 s-1 maximum PAR of saturating flashes

Sensors

Fluorescence: PIN-photodiode protected by longpass filter (50% transmittance at 645 nm). Selective window amplifier to measure pulse amplitude modulated (PAM) fluorescence.

Photosynthetically active radiation (PAR): External LS-C sensor for selective PAR measurement, range 0 to 7000 μmol m-2 s-1, cosine-corrected for light incident at angles between -30° to +30° from the surface normal

Temperature: Thermocouple: Ni-CrNi, wire diameter 0.1 mm, -20 to +60 °C

Humidity: Capacitive-type humidity sensor on a specialized analog and digital integrated circuit, 0 - 100% relative humidity

Measuring Head MICRO-HEAD/3A

General Design

Modulated fluorescence excitation: Amber power LED (typical peak wavelength 598 nm, full width at half maximum 27 nm). Photosynthetically active radiation (PAR) of measuring light at level of the sample clip range from 0.15 to 1.5 μmol m-2 s-1 at low modulation frequencies (5 to 25 Hz), and from 1.5 to 22.5 μmol m-2 s-1 at high modulation frequencies (100 Hz)

Actinic light: Same power LED as for modulated light. At sample level of leaf clip, 3000 μmol m-2 s-1 maximum PAR of actinic light, 8000 μmol m-2 s-1 maximum PAR of saturating flashes

Further specifications: Same as Measuring Head MICRO-HEAD/3B