RETIRED ›
This product is no longer available and has been replaced by: 107. Some accessories, replacement parts, or services may still be available.
107-LC Temperature Probe for ET or MetData
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Overview

The 107-LC consists of a thermistor encapsulated in an epoxy-filled aluminum housing. It measures the range of -35° to +50°C; to measure the -5° to +95°C temperature range, see the 108-LC probe.


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Benefits and Features

  • Versatile product—measures air, soil, or water temperature
  • Easy to install on the ET107 Weather Station
  • Durable

The 107-LC is a version of the 107 that has a cable terminated in a connector rather than the standard pigtails. The connector can be attached to the CS110 lightning meter or to the ET107, ET106, or MetData1 weather stations.

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Detailed Description

The 107-LC consists of a thermistor encapsulated in an epoxy-filled aluminum housing. Its cable terminates in a connector that attaches to the ET107 Weather Station, ET106 Weather Station (retired), or MetData1 Weather Station (retired). The 107-LC measures the range of -35° to +50°C; to measure the -5° to +95°C temperature range, see the 108-LC probe.

Soil Temperature

The 107-LC is suitable for shallow burial only. It should be placed horizontally at the desired measurement depth to avoid thermal conduction from the surface to the thermistor. Placement of the sensor cable inside a rugged conduit may be advisable for long cable runs, especially in locations subject to digging/mowing, traffic, use of power tools, or lightning strikes.

Water Temperature

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

Compatibility

The cable of the 107-LC provides a connector that attaches to the  ET107 Weather Station, ET106 Weather Station (retired), or MetData1 Weather Station (retired). The ET107 Weather Station has an on-board CR1000M module. Both the MetData1 Weather Station and ET106 Weather Station have an on-board CR10X module.

Specifications

Sensor BetaTherm 100K6A1IA Thermistor
Tolerance ±0.2°C (over 0° to 50°C range)
Temperature Measurement Range -35° to +50°C
Steinhart-Hart Equation Error ≤ ±0.01°C over measurement range
Time Constant in Air 30 to 60 s (in a wind speed of 5 m s-1)
Maximum Submersion Depth 15.24 m (50 ft)
Probe Diameter 0.762 cm (0.3 in.)
Probe Length 10.4 cm (4.1 in.)
Weight 136 g (5 oz) with 3.05-m (10-ft) cable

Frequently Asked Questions

Number of FAQs related to 107-LC: 4

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  1. How are temperature sensors such as the 107, 108, 109, 110PV-L, and BLACKGLOBE-L calibrated?

    When these sensors are purchased, the following calibration services are offered: TEMPCAL and TEMPCAL2.

    • TEMPCAL provides a single-point calibration and a calibration certificate. The single-point calibration determines the offset at 25°C with an uncertainty of ±0.05°C.
    • TEMPCAL2 provides a two-point calibration and a calibration certificate. The two-point calibration determines offsets at 30°C and 65°C with an uncertainty of ±0.05°C.

    For both of these services, calibration can be made at different values if it is requested by the purchaser at the time of purchase. In addition, both of these calibration services can be requested after sensor purchase using a return material authorization (RMA) number. To request an RMA number, refer to the Repair and Calibration page. 

  2. For the 107, 108, and 109 temperature sensors/probes, where within the white cylinder is the thermistor actually located?

    The thermistor is located approximately 3 mm (0.125 in.) back from the probe tip.

  3. How can measurements be made using a 107, 108, or 109 temperature sensor/probe with a measurement device other than a Campbell Scientific data logger?

    The sensor/probe consists of a non-linear thermistor configured with a precision resistor in a half-bridge circuit, as shown in the product’s manual:

    To measure the sensor/probe, the measurement device has to provide a precision excitation voltage (Campbell Scientific data loggers use 2000 mV), measure the voltage across the precision resistor, determine the thermistor resistance (Ohm's law), and convert the resistance to temperature using the Steinhart-Hart equation.

    The Steinhart-Hart equation is 1/T = A + Bln(R) + C(ln(R))3 where:

    • T is the temperature in Kelvin
    • R is the resistance at T in ohms
    • A, B, and C are the Steinhart-Hart coefficients, which vary depending on the temperature range of interest, as well as the type and model of the thermistor

    For the 107-L, 107-LC, 108-L, and 108-LC, the following are the coefficients for the Steinhart-Hart equation:

    • A = 8.271111E-4
    • B = 2.088020E-4
    • C = 8.059200E-8

    For the 109-L, the following are the coefficients for the Steinhart-Hart equation:

    • A = 1.129241E-3
    • B = 2.341077E-4
    • C = 8.775468E-8
  4. What type of field check can be done on a temperature sensor or a temperature and relative humidity sensor to determine if it is within the range of specified accuracy or if it requires calibration?

    Note the difference between calibration and a field check. Calibration cannot be done in the field, as it requires an experienced technician and specialized equipment.

    Field checks of measurements can be done to determine if the data make sense with the real-world conditions. Follow these steps to field check a sensor:

    1. Find a second sensor of the same type as the installed sensor whose data is in question. The second sensor will be used as a benchmark sensor and should be known to be accurate or recently calibrated.
    2. At the site, take readings using both sensors under the same conditions. The best practice is to measure both sensors side-by-side at the same time. Note that the sensors will never have the exact same measurement.
    3. Depending on the sensor model, if the difference in the readings of the installed and benchmark sensors is greater than the sum of the accuracies for both sensors, either return the installed sensor to Campbell Scientific for calibration or replace the appropriate chip.
      • The 107, 108, 109, 110PV-L, and BlackGlobe-L temperature sensors can be calibrated.
      • The HC2S3-L and HMP155A-L temperature and relative humidity sensors can be calibrated.
      • The CS215-L has a replaceable chip for temperature and relative humidity. For more information, refer to the “Maintenance and Calibration” section of the CS215 instruction manual.
      • The HMP60-L has a replaceable chip for relative humidity only. For more information, refer to the “Maintenance” section of the HMP60 instruction manual.
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