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Campbell 107 Instruction Manual

Temperature probe
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Model 107 Temperature Probe
Revision: 10/08
C o p y r i g h t
©
1 9 8 3 - 2 0 0 8
C a m p b e l l
S c i e n t i f i c ,
I n c .

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Summary of Contents for Campbell 107

  • Page 1 Model 107 Temperature Probe Revision: 10/08 C o p y r i g h t © 1 9 8 3 - 2 0 0 8 C a m p b e l l S c i e n t i f i c ,...
  • Page 2 435-750-9579. Campbell Scientific will not process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense.

  • Page 3: Table Of Contents

    8. Troubleshooting ............12 Figures 2-1. Error Produced by Polynomial fit to Published Values......3 3-1. 107 and 41303-5A Radiation Shield on a Tripod Mast......4 3-2. 107 and 41303-5A Radiation Shield on a CM200 Series Crossarm ..4 6-1. 107 Thermistor Probe Schematic ............10...
  • Page 4 1-1. Recommended Lead Lengths ..............1 2-1. Thermistor Interchangeability Specification........... 2 2-2. Polynomial Error for Edlog Dataloggers ..........2 4-1. Connections to Campbell Scientific Dataloggers ........5 5-1. Wiring for Example Programs..............6 6-1. Polynomial Coefficients ............... 10 6-2. Temperature, Resistance, and Datalogger Output ........ 11...
  • Page 5 Station. Throughout this manual, 107 will refer to both the 107-L and 107-LC unless specified otherwise. Lead length for the 107-L and 107-LC is specified when the sensor is ordered. Table 1-1 gives the recommended lead length for mounting the sensor on a tripod or tower.
  • Page 6 Model 107 Temperature Probe Polynomial Linearization Error: <±0.5°C over -35°C to +50°C (Edlog dataloggers only) Time Constant In Air: Between 30 and 60 seconds in a wind speed of 5 m s Maximum Lead Length: 1000 ft. ® The black outer jacket of the cable is Santoprene rubber.

  • Page 7: Air Temperature

    Model 107 Temperature Probe FIGURE 2-1. Error Produced by Polynomial Fit to Published Values (Edlog dataloggers only) 3. Installation 3.1 Air Temperature 3.1.1 Siting For air temperature measurements, sensors should be located over an open level area at least 9 m (EPA) in diameter. The surface should be covered by short grass, or where grass does not grow, the natural earth surface.
  • Page 8 Model 107 Temperature Probe The 107 must be housed inside a radiation shield when the sensor will be exposed to solar radiation (i.e., air temperature measurements made in the field). The 41303-5A Radiation shield has a U-bolt for attaching the shield to tripod mast / tower leg (Figure 3-1), or CM200 series crossarm (Figure 3-2).

  • Page 9: Soil Temperature

    3.3 Water Temperature The 107 can be submerged to 50 feet. Please note that the 107 is not weighted. Therefore, the installer should either add a weighting system or secure the probe to a fixed or submerged object such as piling.

  • Page 10: Example Programs

    5.2 Edlog The Temp(107) measurement instruction (P11) is used with dataloggers that are programmed with Edlog to measure the 107 probe. P11 makes half bridge voltage measurement, and converts the measurement result to temperature using a fifth order polynomial. With a multiplier of 1 and an offset of 0, the output is temperature in degrees C.

  • Page 11: Example Program For Cr1000 Datalogger

    Model 107 Temperature Probe 5.3.1 Example Program for CR1000 Datalogger 'CR1000 'This example program measures a single 107 Thermistor probe 'once a second and stores the average temperature every 60 minutes. 'Declare the variables for the temperature measurement Public T107_C...

  • Page 12: Electrically Noisy Environments

    CR23X include a delay to accommodate long lead lengths. For the CR10, 21X, and CR7, if the 107 has lead lengths of more than 300 feet, use the DC Half Bridge instruction (Instruction 4) with a 20 millisecond delay to measure temperature.

  • Page 13: Measurement Details

    2.211 6. Measurement Details Understanding the details in this section are not necessary for general operation of the 107 Probe with CSI's dataloggers. 6.1 Therm107 Instruction Therm107 instruction applies a precise 2500 mV excitation voltage and measures the voltage drop across the 1K ohm resistor (Figure 6-1). The ratio...

  • Page 14: Temp(107) Instruction (P11)

    FIGURE 6-1. 107 Thermistor Probe Schematic 6.2 Temp(107) Instruction (P11) The Temp(107) instruction (P11) applies a precise 2VAC (4VAC with the 21X and CR7) excitation voltage and measures the voltage drop across the 1K ohm resistor (Figure 6-2). The ratio of measured voltage (Vs) to the excitation...
  • Page 15 Model 107 Temperature Probe TABLE 6-2. Temperature, Resistance, and Datalogger Output Temperature °C Output °C Resistance OHMS -40.00 4067212 -39.18 -38.00 3543286 -37.55 -36.00 3092416 -35.83 -34.00 2703671 -34.02 -32.00 2367900 -32.13 -30.00 2077394 -30.18 -28.00 1825568 -28.19 -26.00 1606911 -26.15...

  • Page 16: Maintenance And Calibration

    Periodically check cabling for signs of damage and possible moisture intrusion. For most applications it is unnecessary to calibrate the 107 to eliminate the thermistor offset. However, for those users that are interested, the following briefly describes calibrating the 107 probes.
  • Page 17 This is a blank page.
  • Page 18 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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