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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)

-10

612407

-10.00

-9

578366

-9.00

-8

546408

-8.00

-7

516394

-7.00

-6

488196

-6.00

-5

461695

-5.00

-4

436779

-4.00

-3

413346

-3.00

-2

391300

-2.00

-1

370551

-1.00

351017

0.00

332620

1.00

315288

2.00

298954

3.00

283555

4.00

269034

5.00

255335

6.00

242408

7.00

230206

8.00

218684

9.00

108 Temperature Probe

Summary of Contents for 108

Page 2: ...s under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order 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 De...

Page 3: ... cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in some cases alternatives are offered Details of the alternatives will be covered in separate manuals Part numbers prefixed with a symbol are special order parts for use with non EU variants or for special...

Page 4: ...e beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be kil...

Page 5: ...allation 9 7 5 Soil temperature installation 9 8 Operation 10 8 1 Sensor schematic 10 8 2 Measurement and output linearization 10 8 3 Electrically noisy environments 11 8 4 Long cable lengths 11 9 Troubleshooting and maintenance 12 9 1 Troubleshooting 12 9 2 Maintenance 12 9 3 Calibration 13 10 Attributions and references 13 Appendix A Importing Short Cut code into CRBasic Editor 14 Appendix B Exa...

Page 6: ...burning when tested according to U L 94 H B and passes FMVSS302 However local fire codes may preclude its use inside buildings 3 Initial inspection Check the packaging and contents of the shipment If damage occurred during transport immediately file a claim with the carrier Contact Campbell Scientific to facilitate repair or replacement Check model information against the shipping documents to ens...

Page 7: ...ing procedure also describes programming with Short Cut 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 This can be changed by clicking the Deg C box and selecting Deg F for degrees Fahrenheit...

Page 8: ...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: ...he 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 When measuring air temperature a six plate radiation shield is normally used to mount the 108 and limit solar radiati...

Page 10: ... C Probe weight and dimensions Weight with 10 ft cable Length Diameter Compliance 136 g 5 oz 10 4 cm 4 1 in 0 762 cm 0 3 in View the EU Declaration of Conformity at ww campbellsci eu 108 1Overall probe accuracy is a combination of thermistor interchangeability bridge resistor accuracy and error of the Steinhart Hart equation Bridge resistors have 0 1 tolerance with a 10 ppm temperature coefficient...

Page 11: ...nt instruction 7 2 Data logger programming Short Cut is the best source for up to date data logger programming code If your data acquisition requirements are simple you can probably create and maintain a data logger program exclusively with Short Cut If your data acquisition needs are more complex the files that Short Cut creates are a great source for programming code to start a new program or ad...

Page 12: ...ions l Temperature reported as C set Mult to 1 and Offset to 0 l Temperature reported as F set Mult to 1 8 and Offset to 32 l AC mains noise filtering set Integ fN1 to the 60 Hz or 50 Hz option see Electrically noisy environments p 11 l Compensate for long cable lengths Set SettlingTime to 20000 see Long cable lengths p 11 7 3 Air temperature installation For air temperature measurements locate pr...

Page 13: ...ion the RAD06 shield has lower self heating in bright sunlight combined with higher temperatures 24 C 75 F and low wind speeds 2 m s 4 5 mph giving a better measurement The 41303 5A and RAD06 attach to a crossarm mast or user supplied pipe with a 2 5 to 5 3 cm 1 0 to 2 1 in outer diameter The 41303 5B attaches to a CM500 series pole or a user supplied pole with a 5 1 cm 2 4 in outer diameter Tools...

Page 14: ...eld in place Route the sensor cable to the instrument enclosure Secure the cable to the tripod or tower using cable ties 7 4 Water temperature installation 108 probes can be submerged to 15 m 50 ft or 21 psi The 108 is not weighted so a weighting system should be added or the probe secured to a submerged object such as a piling 7 5 Soil temperature installation The 108 tends to measure the average...

Page 15: ...ous FIGURE 8 1 p 10 Therm108 applies 1000 mV excitation at the Vx line and measures the voltage drop across the 1 kΩ resistor at the Vs line The ratio of measured voltage Vs to excitation voltage Vx is related to thermistor resistance Rs and the 1 kΩ and 40 kΩ fixed resistors as described in the following equations Vs Vx 1000 Rs 40000 Ω 1000 Ω Solving for Rs Rs 41000 Ω 1000 Vx Vs Rs 1000 Vx Vs 410...

Page 16: ...108_C 1 U1 U10 0 60 1 0 0 0 CR800 series and CR3000 data loggers example Therm108 T108_C 1 1 Vx1 0 _60Hz 1 0 0 0 8 4 Long cable lengths Long cable lengths 50 ft may require longer than normal analogue measurement settling times 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 cod...

Page 17: ...ble for signs of damage and possible moisture intrusion Symptom Unstable temperature is reported Probably a result of electromagnetic interference Try using the 50 Hz or 60 Hz options for the fN1 parameter and or increasing the settling time as described in Electrically noisy environments p 11 and Long cable lengths p 11 Ensure the clear wire is connected to data logger ground and the data logger ...

Page 18: ...interchangeability offset described in Specifications p 5 10 Attributions and references Santoprene is a registered trademark of Exxon Mobile Corporation Measurement Specialties is a trademarked global designer and manufacturer of sensors and sensor based systems EPA installation standard Quality Assurance Handbook for Air Pollution Measurement Systems Volume IV Meteorological Measurements Version...

Page 19: ...dited for additional refinement NOTE Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program it created 2 To add the Short Cut wiring information into the new CRBasic program open the DEF file located in the C campbellsci SCWin folder and copy the wiring information which is at the beginning of the DEF file 3 Go into the CRBasic program and paste the wiring ...

Page 20: ... Wire Data logger Colour Function Terminal Black Voltage excitation input VX1 EX1 Red Analogue voltage output SE1 Purple Bridge resistor ground Ground Symbol Clear Shield Ground Symbol Declare the variables for the temperature measurement Public T108_C Define a data table for 60 minute averages DataTable Hourly True 1 DataInterval 0 60 Min 0 Average 1 T108_C IEEE4 0 EndTable BeginProg Scan 1 Sec 1...

Page 21: ...resistance Ω CRBasic Therm108 output C 10 612407 10 00 9 578366 9 00 8 546408 8 00 7 516394 7 00 6 488196 6 00 5 461695 5 00 4 436779 4 00 3 413346 3 00 2 391300 2 00 1 370551 1 00 0 351017 0 00 1 332620 1 00 2 315288 2 00 3 298954 3 00 4 283555 4 00 5 269034 5 00 6 255335 6 00 7 242408 7 00 8 230206 8 00 9 218684 9 00 108 Temperature Probe 16 ...

Page 22: ... 13 178610 13 00 14 169921 14 00 15 161700 15 00 16 153921 16 00 17 146558 17 00 18 139586 18 00 19 132983 19 00 20 126727 20 00 21 120799 21 00 22 115179 22 00 23 109850 23 00 24 104795 24 00 25 100000 25 00 26 95449 26 00 27 91129 27 00 28 87027 28 00 29 83131 29 00 30 79430 30 00 31 75913 31 00 32 72569 32 00 33 69390 33 00 34 66367 34 00 35 63491 35 00 108 Temperature Probe 17 ...

Page 23: ...38 00 39 53309 39 00 40 51060 40 00 41 48917 41 00 42 46875 42 00 43 44929 43 00 44 43073 44 00 45 41303 45 00 46 39615 46 00 47 38005 47 00 48 36467 48 00 49 35000 49 00 50 33599 50 00 51 32262 51 00 52 30984 52 00 53 29763 53 00 54 28596 54 00 55 27481 55 00 56 26415 56 00 57 25395 57 00 58 24420 58 00 59 23487 59 00 60 22594 60 00 61 21740 61 00 108 Temperature Probe 18 ...

Page 24: ...8 64 00 65 18670 65 00 66 17981 66 00 67 17322 67 00 68 16689 68 00 69 16083 69 00 70 15502 70 00 71 14945 71 00 72 14410 72 00 73 13897 73 00 74 13405 74 00 75 12932 75 00 76 12478 76 00 77 12043 77 00 78 11625 78 00 79 11223 79 00 80 10837 80 00 81 10466 81 00 82 10109 82 00 83 9767 83 00 84 9437 84 00 85 9121 85 00 86 8816 86 00 87 8523 87 00 108 Temperature Probe 19 ...

Page 25: ...mistor resistance Ω CRBasic Therm108 output C 88 8241 88 00 89 7970 89 00 90 7708 90 00 91 7457 91 00 92 7215 92 00 93 6982 93 00 94 6758 94 00 95 6541 95 00 96 6333 96 00 97 6132 97 00 98 5939 98 00 99 5753 99 00 100 5573 100 00 1Data from Measurement Specialties 108 Temperature Probe 20 ...

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