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INSTRUCTION MANUAL CNR4 Net Radiometer Revision: 2/15 Copyright © 2000- 2015 Campbell Scientific, Inc.

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CNR4 Net Radiometer 1. Introduction The CNR4 is a research-grade net radiometer that measures the energy balance between incoming and outgoing radia

CNR4 Net Radiometer 4. Quickstart Please review Section 7, Operation, for wiring and CRBasic programming. Appendix D, CNF4 Heater/Ventilator, provid

CNR4 Net Radiometer 2. Attach the 26120 mounting bracket to the vertical mounting pipe, or CM200-series crossarm using the provided U-bolt (see FIGUR

CNR4 Net Radiometer 5. Tighten the four screws on top of the mounting bracket to properly secure the support arm so that it does not rotate (see FIGU

CNR4 Net Radiometer 3. When Short Cut opens, select New Program. 4. Select Datalogger Model and Scan Interval (default of 5 seconds is OK for most

CNR4 Net Radiometer 5. Under the Available Sensors and Devices list, select Sensors | Meteorological | Solar Radiation folder. Select CNR4 Net Radia

CNR4 Net Radiometer 7. After selecting the sensitivity values, click at the left of the screen on Wiring Diagram to see how the sensor is to be wired

CNR4 Net Radiometer Two temperature sensors, a thermistor and a Pt-100, are integrated with the CNR4 body. The temperature sensor is used to provide

CNR4 Net Radiometer • Separate outputs of short-wave and long-wave infrared radiation for better accuracy and more thorough quality assurance • Sola

CNR4 Net Radiometer 6.1 CNR4 Specifications Sensor sensitivities: Four probes with unique sensitivity values. Please refer to the calibration sheets

CNR4 Net Radiometer Directional error*: < 20 W/m2 at angle up to 80° with 1000 W/m2 Zero offset due to 0 to -200 W/m2 IR net irradiance*: < 15

CNR4 Net Radiometer Field of view Upper: Lower: 180 degrees 150 degrees Net-irradiance: –250 to +250 W/m2 Non-stability: < 1% (sensitivity change

CNR4 Net Radiometer 7.1 Using the CNR4 in the Four Separate Components Mode In the four separate components mode configuration (measuring two short-w

CNR4 Net Radiometer In this equation, C is the sensitivity of the sensor. T is in Kelvin, and not in Celsius or Fahrenheit. The downward-facing pyrg

CNR4 Net Radiometer TABLE 7-1. Resistance values versus CNR4’s thermistor temperature in °C Temperature [°C] Resistance [Ω] Temperature [°C] Resistan

CNR4 Net Radiometer TABLE 7–2. Resistance values versus CNR4’s Pt–100 temperature in °C Temperature [°C] Resistance [Ω] Temperature [°C] Resistance [

CNR4 Net Radiometer site, the calculation of albedo can also serve as a tool for quality control of your measured data at a specific site. 7.1.5 Calc

CNR4 Net Radiometer 7.1.7 Calculation of Net (Total) Radiation In the four separate components mode, net radiation, Rn, can be calculated using the i

CNR4 Net Radiometer FIGURE 7-2. The marks on the end of the CNR4: S for SOLAR cable, and T for TEMP cable The measurement details for Pt-100 sensor,

Limited Warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service

CNR4 Net Radiometer FIGURE 7-4. Labels on the pigtail end of the TEMP cable. TABLE 7-3. Datalogger Connections for Differential Measurement Functi

CNR4 Net Radiometer TABLE 7-4. Datalogger Connections for Single-Ended Measurement Function Wire Color CR6, CR1000, CR3000, CR5000 Pyranometer Up S

CNR4 Net Radiometer The CNR4 outputs four voltages that typically range from 0 to 15 mV for the pyranometers, and ± 5 mV for the pyrgeometers. A diff

CNR4 Net Radiometer 8.1 Testing the Pyranometer As a first test, check the sensor impedance. It should have a nominal value as indicated in the spec

CNR4 Net Radiometer 8.4 Testing the Pt-100 Using a multimeter, measure the resistance between the two opposite wires of the Pt-100 (gray-yellow, gray

CNR4 Net Radiometer FIGURE 9-1. Replacing the drying cartridge 9.4 Replacement Parts The following is the list of replacement parts for the CNR4 an

CNR4 Net Radiometer 26

Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: • How to import a Short Cut program into a program editor for additio

Appendix A. Importing Short Cut Code Into CRBasic Editor mark) begins each line. This character instructs the datalogger compiler to ignore the line

Appendix B. Example Programs B.1 CR1000 Program Using Differential Measurements This example requires four differential channels to measure the fou

Assistance Products may not be returned without prior authorization. The following contact information is for US and international customers residing

Appendix B. Example Programs ' '8H '8L CNR4 thermistor signal (white) 'gnd CNR4 thermistor signal reference (black)

Appendix B. Example Programs Sample (1,logger_temp,FP2) Average (4,cnr4(1),IEEE4,False) Average (1,cnr4_T_C,IEEE4,False) Average (1,cnr4_T_K,

Appendix B. Example Programs B.2 CR3000 Program Using Differential Measurements This example requires four differential channels to measure the four

Appendix B. Example Programs 'VOLTAGE EXCITATION ' 'VX1 CNR4 thermistor voltage excitation (red) ' 'CNR4 sensor Public

Appendix B. Example Programs Average (1,Rs_net,IEEE4,False) Average (1,Rl_net,IEEE4,False) Average (1,albedo,IEEE4,False) Average (1,Rn,IEEE4

Appendix B. Example Programs B.3 CR5000 Program Using Differential Measurements This example requires four differential channels to measure the four

Appendix B. Example Programs '4H CNR4 Pyrgeometer Lower signal (brown) '4L CNR4 Pyrgeometer Lower signal reference (green) 'gn

Appendix B. Example Programs Minimum (1,batt_volt,FP2,0,False) Sample (1,logger_temp,FP2) Average (4,cnr4(1),IEEE4,False) Average (1,cnr4

Appendix B. Example Programs B.4 CR3000 Program for Measuring Pt-100 Temperature Sensor This example measures the Pt-100 sensor for the body tempera

Appendix B. Example Programs 'CR3000 Series Datalogger ' 'CNR4 program 'This program measures CNR4 four-component net radiometer

Precautions DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO

Appendix B. Example Programs Units cnr4_T_K = K Units long_up_corr = W/m^2 Units long_dn_corr = W/m^2 Units Rs_net = W/m^2 Units Rl_net = W/m^2 Units

Appendix B. Example Programs PRT (cnr4_T_C,1,Rs_R0,1,0) 'Convert CNR4 temperature to Kelvin cnr4_

Appendix B. Example Programs B-14

Appendix C. CNR4 Performance and Measurements under Different Conditions TABLE C-1 shows what one might typically expect to measure under different

Appendix C. CNR4 Performance and Measurements under Different Conditions FIGURE C-1. Different measurement conditions and signals FIGURE C-2. Par

Appendix C. CNR4 Performance and Measurements under Different Conditions FIGURE C-3. Clear day for the downward facing pyrgeometer It is assumed th

Appendix C. CNR4 Performance and Measurements under Different Conditions 4/181067.5CG3upper EeTemperaturSky ⋅=− (C-1) 4/181067.5⋅=−CG

Appendix D. CNF4 Heater/Ventilator Whenever the heater is used, the heating may cause errors in the measurement of the sensor temperature. Under mos

Appendix D. CNF4 Heater/Ventilator 10 watt power available? Not available DO NOT HEAT Available Consider options below Clock and relay available?

Appendix D. CNF4 Heater/Ventilator D.2 Attaching the Optional CNF4 Heater/Ventilator Unit to CNR4 1. The CNF4 heater/ventilator unit comes with the

Appendix D. CNF4 Heater/Ventilator 2. Attach the heater/ventilator unit unto the bottom of the CNR4 sensor, using the three pan-head screws and wash

Appendix D. CNF4 Heater/Ventilator 3. Make sure the cables are cleared from the edges of the CNF4, as shown in FIGURE D-3, and place the white solar

Appendix D. CNF4 Heater/Ventilator FIGURE D-5. Attaching the solar shield to CNF4 using four flat-head screws 4. Once the CNF4 heater/ventilator u

Appendix D. CNF4 Heater/Ventilator D.3 Wiring The following table shows the recommended datalogger wiring for using the CNR4 sensor with the CNF4 he

Appendix D. CNF4 Heater/Ventilator D.4 CR3000 Datalogger Program with Heater/Ventilator Control This example measures the four radiation outputs, th

Appendix D. CNF4 Heater/Ventilator ' CNF4 heater - (yellow) ' 'gnd ventilator & heater shield (clear) Pip

Appendix D. CNF4 Heater/Ventilator Average (1,long_dn_corr,IEEE4,False) Average (1,Rs_net,IEEE4,False) Average (1,Rl_net,IEEE4,False) Average

Appendix D. CNF4 Heater/Ventilator D.5 CNF4 Heater/Ventilator Maintenance D.5.1 Testing the Heater The optional CNF4 consists of a heater and a ven

Appendix D. CNF4 Heater/Ventilator D-12

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Table of Contents 9. Maintenance and Recalibration ... 24 9.1 Cleaning Windows and Domes ...

Table of Contents D-4. CNF4 solar shield and four flat-head screws ......... D-5 D-5. Attaching the solar shield to CNF4 us