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Campbell NR-Lite Instruction Manual

Manual is about: NET RADIOMETER

Summary of NR-Lite

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    Nr-lite net radiometer instruction manual revision: 11/03 copyright (c) 1998-2003 campbell scientific, inc..

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  • Page 3: Warranty and Assistance

    Warranty and assistance the nr-lite net radiometer is warranted by campbell scientific, inc. To be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. Campbell scientific, inc...

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  • Page 5: Nr-Lite Table of Contents

    I nr-lite table of contents 1. General description....................................................1 1.1 electrical properties..................................................................................2 1.2 spectral properties ..................................................................

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  • Page 7: Nr-Lite Net Radiometer

    1 nr-lite net radiometer the nr-lite is a high-output thermopile sensor which measures the algebraic sum of incoming and outgoing all-wave radiation (i.E. Both short-wave and long-wave components). Incoming radiation consists of direct (beam) and diffuse solar radiation plus long-wave irradiance fro...

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    Nr-lite net radiometer 2 1.1 electrical properties the thermopile consists of a number of thermocouples connected in series, essentially providing a highly sensitive differential temperature sensor. The thermopile generates a voltage output – the sensor itself is passive, and so no power supply is r...

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    Nr-lite net radiometer 3 figure 3. Approximate spectral sensitivity and solar/f.I.R. Radiation the upwards facing sensor is calibrated for solar radiation wavelengths. The following assumptions are made: • it is assumed that the downwards facing sensor has the same sensitivity. However, since the tw...

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    Nr-lite net radiometer 4 figure 4. Cosine response of a typical net radiometer 1.4 sensitivity to wind speed the calibration of the nr-lite is carried out at zero wind speed. At any other wind speed the sensitivity will decrease. It has been shown that this decrease in sensitivity is less than 1% of...

  • Page 11: 2. Sensor Specifications

    Nr-lite net radiometer 5 figure 5. Nr-lite wind sensitivity 2. Sensor specifications spectral spectral range: 0.2 to 100 µm detector type: thermopile detector protection: teflon coating detector profile: conical directional directional error: (0 - 60° at 1000 w m -2 ): -2 sensor asymmetry: ±5% typic...

  • Page 12: 3. Installing The Nr-Lite

    Nr-lite net radiometer 6 mechanical housing material: anodized aluminum cable material: polyurethane weight: 200 g cable length: 15 m (can be extended up to 100 m) physical dimensions sensor: 3.1” (8.0 cm) diameter support arm: 0.6” (1.6 cm) diameter x 31.5” (80 cm) l weight: 23 oz (635 g) environme...

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    Nr-lite net radiometer 7 figure 6. Nr-lite mounting options 14264 mounting bracket nr-lite ut018 crossarm 14264 mounting bracket nr-lite.

  • Page 14: 4. Wiring

    Nr-lite net radiometer 8 4. Wiring the nr-lite can be measured with a differential or single-ended channel on the datalogger; a differential channel is recommended. Figure 7. Nr-lite to datalogger connections table 1. Datalogger connections for differential measurement function color cr10x,cr510 cr2...

  • Page 15: 5. Datalogger Programming

    Nr-lite net radiometer 9 5. Datalogger programming the nr-lite outputs a low-level voltage ranging from 0 to a maximum of about 15 mv. A differential voltage measurement (instruction 2) is recommended because it has better noise rejection than a single-ended measurement. If a differential channel is...

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    Nr-lite net radiometer 10 wiring for example 1 color function example cr10x program channels used white radiation signal 1h green signal reference 1l jumpered to ag clear shield g ;{cr10x} ; *table 1 program 01: 60 execution interval (seconds) 1: volt (diff) (p2) 1: 1 reps 2: 3** 25 mv slow range ;r...

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    Nr-lite net radiometer 11 ;{cr10x} ; *table 1 program 01: 60 execution interval (seconds) ;measure 05103 wind speed 1: pulse (p3) 1: 1 reps 2: 1 pulse channel 1 3: 21 low level ac, output hz 4: 1 loc [ wspd_m_s ] 5: .0980 mult 6: 0 offset ;measure nr-lite net radiation 2: volt (se) (p1) 1: 1 reps 2:...

  • Page 18: 6. Maintenance

    Nr-lite net radiometer 12 9: z=x (p31) 1: 2 x loc [ rn_obs ] 2: 3 z loc [ rn_cor ] 10: end (p95) 11: if time is (p92) 1: 0 minutes (seconds --) into a 2: 60 interval (same units as above) 3: 10 set output flag high (flag 0) 12: real time (p77) 1: 1220 year,day,hour/minute (midnight = 2400) 13: avera...

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    Nr-lite net radiometer 13 introduce thermal shocks. Hold the instrument only by its mounting arm at all times. Follow the procedure outlined below: • connect the nr-lite wires to the voltmeter. Connect the white wire to the positive lead and the green wire to the negative lead. • select the most sen...

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    Nr-lite net radiometer 14 • if this appears to produce no results, measure the impedance of the sensor across the white and green wires. The impedance reading should be close to 2.3 Ω. If it is virtually zero, a short circuit is indicated. If it is ‘infinite’, the thermopile is blown. 7.3 readings a...