Campbell 108 Product Manual
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Campbell 108 Product Manual

Temperature probe
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Revision: 05/2021
Copyright © 1983 – 2021
Campbell Scientific
CSL I.D - 013

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Summary of Contents for Campbell 108

  • Page 1 Revision: 05/2021 Copyright © 1983 – 2021 Campbell Scientific CSL I.D - 013...
  • Page 2 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...
  • Page 3 About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in (square inch) = 645 mm Mass: 1 oz.
  • Page 4 • Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS...

  • Page 5: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 5. Overview 6. Specifications 7. Installation 7.1 Wiring to data logger 7.2 Data logger programming 7.2.1 Therm108() instruction 7.3 Air temperature installation 7.4 Water temperature installation 7.5 Soil temperature installation 8.

  • Page 6: Introduction

    1. Introduction The 108 Temperature Probe uses a thermistor to measure temperature in air, soil, and water. It easily interfaces with most Campbell Scientific data loggers and can be used in a variety of applications. For Edlog data logger support, check the availability of an older manual at www.campbellsci.com/old-manuals...
  • Page 7 1. Open Short Cut and click Create New Program. 2. Double-click the data logger model. 3. In the Available Sensors and Devices box, type 108 or find the 108 in the Sensors > Temperature folder. Double-click the 108 Temperature Probe. Data defaults to degree Celsius.
  • Page 8  4. Click the Wiring tab to see how the sensor is to be wired to the data logger. Click OK after wiring the sensor.  5. Repeat steps three and four for other sensors being measured. Click Next.  6. In Output Setup, type the scan rate, Data Output Storage Intervals, and meaningful table names. 108 Temperature Probe     3...

  • Page 9: Overview

    5. Overview The 108 is a rugged probe that accurately measures air, soil, or water temperature in a variety of applications. The sensor consists of a thermistor encapsulated in an epoxy-filled aluminium housing. This design allows the probe to be buried or submerged in water to 15 m (50 ft) or 21 psi.

  • Page 10: Specifications

    Interchangeability is the principle component error. If needed, an estimate of the interchangeability error for 0 to 50 °C, that can be used as the Offset parameter of the Therm108() instruction, can be determined with a 1-point or 2-point calibration. 108 Temperature Probe     5...

  • Page 11: Installation

    CRBasic Editor to create or add to a customized program, follow the procedure in Importing Short Cut code into CRBasic Editor (p. 14). Programming basics are provided in the following section. A complete program example can be found in Example program (p. 15). 108 Temperature Probe     6...

  • Page 12: Therm108() Instruction

    If the 108 probe is to be used with long cable lengths or in electrically noisy environments, consider employing the measurement programming techniques outlined in Electrically noisy environments (p. 11) and Long cable lengths (p. 11). Details of 108 probe measurement and linearization of the thermistor output are provided in Measurement and output linearization (p.
  • Page 13 When exposed to sunlight, the 108 should be housed in a six-plate solar radiation shield. Six- plate shields offered by Campbell Scientific are models 41303-5A, 41303-5B, or RAD06. The white colour of these shields reflects solar radiation, and the louvred construction allows air to pass freely through, thereby keeping the probe at or near ambient temperature.

  • Page 14: Water Temperature Installation

    Tighten the screws to secure the sensor, and route the sensor cable to the instrument enclosure. The 108 is held in the RAD06 radiation shield by inserting the sensor through the sensor gland at the bottom of the shield (FIGURE 7-2 (p.

  • Page 15: Operation

    8.1 Sensor schematic FIGURE 8-1. 108 thermistor probe schematic 8.2 Measurement and output linearization Therm108() CRBasic instruction measures the 108 probe thermistor and automatically converts Therm108() the result to temperature. With reference to the previous FIGURE 8-1 (p. 10), applies 1000 mV excitation at the Vx line and measures the voltage drop across the 1 kΩ resistor at the Vs line.

  • Page 16: Electrically Noisy Environments

    Enter a longer settling time in the SettlingTime parameter of the Therm108() instruction. Campbell Scientific suggests doubling the settling time every 50 ft. The following code snip examples increase settling time by 20000 µs by placing 20000 as the argument in the...

  • Page 17: Troubleshooting And Maintenance

    9.2 Maintenance The 108 probe requires minimal maintenance. For air temperature measurements, check the radiation shield monthly to make sure it is free from dust and debris. To clean the shield, first remove the sensor.

  • Page 18: Calibration

    Offset parameter of the Therm108() instruction, can be determined with a 1-point or 2-point calibration. Calibration of the 108 probe is not necessary unless the accuracy needed in the sensor data requires correction of the thermistor interchangeability offset described in Specifications (p.

  • Page 19: Appendix A. Importing Short Cut Code Into Crbasic Editor

    Block. This adds an apostrophe (') to the beginning of each of the highlighted lines, which instructs the data logger compiler to ignore those lines when compiling. The Comment Block feature is demonstrated at about 5:10 in the CRBasic | Features video 108 Temperature Probe     14...

  • Page 20: Appendix B. Example Program

    Appendix B. Example program This following example measures one 108 temperature probe once a second and stores the average temperature every 60 minutes. CRBasic Example 1: CR1000X program that measures the 108 'Program measures one 108 temperature probe once a second and 'stores the average temperature every 60 minutes.

  • Page 21: Appendix C. Thermistor Resistance And Temperature

    Appendix C. Thermistor resistance and temperature   Table C-1: 108 thermistor resistance and temperature Actual temperature (°C) 100K6A1iA thermistor resistance (Ω) CRBasic Therm108() output (°C) 612407 -10.00 578366 -9.00 546408 -8.00 516394 -7.00 488196 -6.00 461695 -5.00 436779 -4.00 413346 -3.00...
  • Page 22 Table C-1: 108 thermistor resistance and temperature Actual temperature (°C) 100K6A1iA thermistor resistance (Ω) CRBasic Therm108() output (°C) 207801 10.00 197518 11.00 187799 12.00 178610 13.00 169921 14.00 161700 15.00 153921 16.00 146558 17.00 139586 18.00 132983 19.00 126727 20.00 120799 21.00...
  • Page 23 Table C-1: 108 thermistor resistance and temperature Actual temperature (°C) 100K6A1iA thermistor resistance (Ω) CRBasic Therm108() output (°C) 60755 36.00 58150 37.00 55670 38.00 53309 39.00 51060 40.00 48917 41.00 46875 42.00 44929 43.00 43073 44.00 41303 45.00 39615 46.00 38005 47.00...
  • Page 24 Table C-1: 108 thermistor resistance and temperature Actual temperature (°C) 100K6A1iA thermistor resistance (Ω) CRBasic Therm108() output (°C) 20922 62.00 20138 63.00 19388 64.00 18670 65.00 17981 66.00 17322 67.00 16689 68.00 16083 69.00 15502 70.00 14945 71.00 14410 72.00 13897 73.00...
  • Page 25 Table C-1: 108 thermistor resistance and temperature Actual temperature (°C) 100K6A1iA thermistor resistance (Ω) CRBasic Therm108() output (°C) 8241 88.00 7970 89.00 7708 90.00 7457 91.00 7215 92.00 6982 93.00 6758 94.00 6541 95.00 6333 96.00 6132 97.00 5939 98.00 5753 99.00...
  • Page 26 Campbell Scientific regional offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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