Kipp & Zonen PAR lite Instruction Manual
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Kipp & Zonen PAR lite Instruction Manual

Photosynthetic active radiometer
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PAR lite
Photosynthetic Active Radiometer
Instruction Manual

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Summary of Contents for Kipp & Zonen PAR lite

  • Page 1 PAR lite Photosynthetic Active Radiometer Instruction Manual...
  • Page 2 IMPORTANT USER INFORMATION Reading this entire manual is recommended for full understanding of the use of this product The exclamation mark within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance instructions in the literature accompanying the instrument.
  • Page 3 IMPORTANT USER INFORMATION WARRANTY AND LIABILITY the Kipp & Zonen guarantees that the product delivered has been thoroughly tested to ensure that it meets its published specifications. The warranty included in conditions of delivery is valid only if the product has been installed and used according to the instructions supplied by Kipp &...

  • Page 4: Table Of Contents

    CONTENTS Contents General information............3 Five minutes user guide ..........4 Sensor properties ............7 Electrical................ 7 Spectral ................. 9 Directional / Cosine response ........10 List of specifications ............ 12 Dimensions..............14 Expected output levels ..........15 Calibration ..............17 Installation and maintenance ........
  • Page 5 CONTENTS Measuring modulated light .......... 21 Trouble shooting............23 Delivery ................. 25 Accessories..............27 Instruction manual PAR-LITE...
  • Page 6 CONTENTS Instruction manual PAR-LITE...

  • Page 7: General Information

    Contrary to similar designs of other brands, the PAR LITE is not equipped with a level. The reason is that for the kind of accuracy that this sensor can offer, leveling does not need to be accurate.
  • Page 8 GENERAL INFORMATION can be done in the same way. A levelling fixture is available as an option. The PAR-LITE fully complies CE with directive 89/336/EEC Instruction manual PAR-LITE...

  • Page 9: Five Minutes User Guide

    • Adjust the voltmeter range in such a way that the expected full scale output of the PAR LITE fits the full scale input of the voltmeter. This can be done on theoretical considerations. (When the maximum expected...
  • Page 10 ( 5 µV/µmol/s.m • For permanent installation mounting should be done using the holes through the PAR LITE body, or through the holes in the optional levelling fixture. The sensor should be mounted in a field which is free from obstructions.

  • Page 11: Sensor Properties

    180 degrees, and angular characteristics fulfilling the so- called cosine response. 2.1 Electrical The electrical circuit of the PAR LITE is drawn in figure 1. The nominal output resistance of the PAR LITE is 240 Ω. This implies that the input impedance of the readout equipment should be at least 30 kΩ...
  • Page 12 SENSOR PROPERTIES Figure 1 Electrical circuit of the PAR LITE, white +. Instruction manual PAR-LITE...

  • Page 13: Spectral

    SENSOR PROPERTIES 2.2 Spectral The spectral properties of the PAR LITE are mainly determined by the properties of the photodiode and the filter. The spectral sensitivity is indicated in figure 2. Figure 2. The relative spectral sensitivity of the PAR LITE sensor and the ideal PAR spectral response together with the spectrum of the sun under a clear sky (airmass 1.5) and...

  • Page 14: Directional/Cosine Response

    500 – 600 nm. This implies that actually the mean spectral sensitivity of the PAR LITE in the range of 500 – 600 nm should be used. This sensitivity can differ from the sensitivity for daylight, which is also determined by the individual bandwidth of the PAR LITE sensor.
  • Page 15 SENSOR PROPERTIES sensitivity should be proportional to the cosine of the angle of incidence. Figure 3 shows the behaviour of a typical PAR LITE. The vertical axis shows the deviation from ideal behaviour, expressed in percentage of the ideal value. Z E N IT H A N G LE ( de gre e s ) Figure 3.

  • Page 16: List Of Specifications

    SENSOR PROPERTIES 2.4 List of specifications Electrical • Impedance (nominal): 240 Ω • Response time: < 0.1 s • Sensitivity: 4 - 6 µV/µmol/s.m • Expected signal range under atmospheric conditions: 0 – 12 mV • Non-stability: within ± 2%/year •...
  • Page 17 SENSOR PROPERTIES Directional • Cosine corrected between 0 and 80 Error up to 80° angle of incidence, within ± 10 % • azimuth error (at 70° angle of incidence): < 5 %pp • Tilt response: no error Mechanical • Material of housing: Anodized Aluminium •...

  • Page 18: Dimensions

    SENSOR PROPERTIES 2.5 Dimensions Figure 4. The dimensions of the PAR LITE in mm, white lead positive, green lead negative. Instruction manual PAR-LITE...

  • Page 19: Expected Output Levels

    SENSOR PROPERTIES 2.6 expected output levels µmol/W.s Cloud Pyranometer PAR sensor condition reading W/m reading +/- 10% µmol/s.m Cloudless Typ 0 to 1300 Typ 0 to 2600 Cloudy Typ 0 to 500 Typ 0 to 1250 to µmol/s.m Table 1: Conversion from W/m under cloudless and cloudy conditions.
  • Page 20 SENSOR PROPERTIES Cloud Pyranometer PAR sensor condition daily total daily total W.h/m mol/m Cloudless Up to 11000 Up to 80 Cloudy Up to 4500 Up to 40 Table 2: expected daily totals; the figures are indicative Instruction manual PAR-LITE...
  • Page 21 1.5. The spectrum for airmass 1.5 was taken from the international standard ISO 9845-1 By this way we state that the PAR LITE sensitivity is most correct for hemispherical solar radiation with airmass 1.5 spectrum (solar zenith angle 37°). Under artificial light (lamps)

  • Page 22: Calibration

    CALIBRATION Instruction manual PAR-LITE...

  • Page 23: Installation And Maintenance

    (this prevents excessive heating of the leads). When installed on a mast, preferred orientation is such that no shadow is cast on the PAR LITE during any time of the day. On the northern hemisphere this implies that the PAR LITE should be south of the mast.

  • Page 24: Recalibration

    - (green) output wires. In this way the internal resistance is 270 Ω. is shunted. Suppose, the internal (load) resistance R To be sure, measure the impedance of the PAR LITE with an Ohmmeter, in the correct direction. (reverse voltage on photodiode). Neglecting the cable-resistance, the cable resistance is 0.12 Ω...

  • Page 25: Measuring Modulated Light

    INSTALLATION AND MANTENANCE Measuring modulated light In the same way it is possible to shunt the PAR LITE with a capacitor. This can be necessary when modulated light must be measured. The PAR LITE has a response time much smaller than 0,1s and much read-out equipment cannot handle the resulting voltage pulses.
  • Page 26 INSTALLATION AND MANTENANCE Instruction manual PAR-LITE...
  • Page 27 TROUBLE SHOOTING Trouble shooting If your PAR LITE does not seem to work at all, please follow the following procedure: • Check if the PAR LITE reacts to light, using the procedure in the "five minutes user manual". • No result? Measure the impedance of the sensor across the white and the green wires in the dark.

  • Page 28: Trouble Shooting

    TROUBLE SHOOTING ohm. If smaller than 3000 ohm you will notice errors of already –10 %. • Is your readout equipment properly calibrated? If still no satisfactory answer is found, please contact your supplier. Instruction manual PAR-LITE...
  • Page 29 DELIVERY Delivery Delivery includes: 1 PAR LITE sensor 0348900 1 calibration certificate ----------- 1 manual 0348200 Instruction manual PAR-LITE...

  • Page 30: Delivery

    DELIVERY Instruction manual PAR-LITE...

  • Page 31: Accessories

    ACCESSORIES Accessories CLF1 levelling fixture 0338700 Instruction manual PAR-LITE...
  • Page 32 Our customer support remains at your disposal for any maintenance or repair, calibration, supplies and spares. Für Servicearbeiten und Kalibrierung, Verbrauchsmaterial und Ersatzteile steht Ihnen unsere Customer Support Abteilung zur Verfügung. Notre service 'Support Clientèle' reste à votre entière disposition pour tout problème de maintenance, réparation ou d'étalonnage ainsi que pour les accessoires et pièces de rechange.

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