105E-L Type E Thermocouple Burial Probe
Rugged, Accurate, Versatile
Can be used in a variety of applications
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported


The 105E is a thermocouple designed to measure soil temperature. It easily interfaces with our dataloggers.

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Benefits and Features

  • Junction is electrically isolated from the soil, thereby avoiding measurement errors due to differences in ground potential
  • Compatible with most Campbell Scientific data loggers


Technical Description

The 105E consists of a shielded, 24-AWG, type E thermocouple wire. Its junction is electrically isolated from the soil (or other media being measured). Electrical isolation avoids measurement errors due to differences in ground potential.

Type E thermocouples are comprised of a chromel wire and a constantan wire joined at a measurement junction. A voltage potential is generated when the measurement end of the thermocouple is at a different temperature than the reference end of the thermocouple. The magnitude of the voltage potential is related to the temperature difference. Therefore, temperature can be determined by measuring the differences in potential created at the junction of the two wires.

A reference temperature measurement is required for thermocouple measurements. The temperature sensor built into many of our dataloggers' wiring panel typically provides this measurement.


Type Chromel-Constantan
Typical Output 60 μV/°C
Accuracy Refer to the Thermocouple Measurement section in the data logger manual.
Operating Temperature Range -55° to +125°C (of TPE outer jacket)
Probe Diameter 0.8 cm (0.3 in.)
Plug Dimensions 1.8 x 3.3 x 1.0 cm (0.7 x 1.3 x 0.4 in.)
Weight 90 g (0.2 lb) with 3.05-m (10-ft) cable


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
CR1000 (retired)
CR1000X To obtain the highest accuracy, a high-accuracy junction measurement is required, such as that obtained using a 109 Temperature Probe or a GRANITE™ TEMP 120.
CR6 To obtain the highest accuracy, a high-accuracy junction measurement is required, such as that obtained using a 109 Temperature Probe or a GRANITE™ TEMP 120.
CR800 (retired)
CR850 (retired)

Additional Compatibility Information


The 105E is typically buried in the soil or other media. At the desired depth, the sensor should be placed horizontally to avoid thermal conduction between the surface and measurement junction. Placement of the sensor cable inside a rugged conduit may be advisable for long cable runs in locations subject to digging/mowing or lightning strikes.


If large numbers of 105Es need to be measured, the AM25T Thermocouple Multiplexer is recommended.

Data Logger Considerations


The 105E is measured by the TCDiff instruction in CRBasic and by Instruction 14 (Differential Thermocouple) in Edlog. One differential channel per probe is required; a thermocouple reference junction at the data logger is also required. The CR200(X)-series, CR500, and CR510 dataloggers do not have thermocouple measurement instructions and are therefore not compatible with the 105E.

Resources and Links

FAQs for

Number of FAQs related to 105E-L: 5

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  1. The 105E-L is only as portable as the data acquisition system. Typical data acquisition systems are either permanent or semi-permanent; therefore, the 105E-L is intended for in-situ, long-term measurements.

  2. The correct Short Cut entry for the 105E-L is 105E (chromel-constantan) Thermocouple. This selection provides sensor-specific information, such as the color-coded wiring diagram and program annotation.  However, the Type E (chromel-constantan) Thermocouple entry will produce the same measurement instruction.

  3. Yes. A reference temperature is required for the 105E-L thermocouple measurement. The data logger wiring panel temperature is an appropriate reference temperature when the 105E-L is wired directly to the data logger. Additional considerations are necessary if the 105E-L is being measured on a multiplexer. For more information, refer to the “Thermocouple Measurement” section in the AM16/32B Relay Multiplexer Instruction Manual

  4. There are many sources for Type E thermocouple reference tables available online. One example is provided by OMEGA in the "Revised Thermocouple Reference Tables." 

  5. The TPE outer jacket on the 105E-L has an operating temperature range of -55°C to +125°C. 

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