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

Overview

The 105E consists of a 24-gage, shielded, type E thermocouple wire that typically is used to measure soil temperature. Because the thermocouple junction is electrically isolated from the media being measured, you can avoid measurement errors caused by differences in ground potential.

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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 dataloggers

The "-L" on a product model indicates that the cable length is specified at the time of order.

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Detailed Description

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 (typically measured at the datalogger wiring panel) is required. Options for measuring the reference temperature include:

  • Thermistor built into the CR6, CR800, CR850, CR1000, CR3000, or CR5000 wiring panel
  • PRT built into the wiring panel of the CR9050 or CR9051E input module for the CR9000X Measurement and Control System

Specifications

Type Chromel-Constantan
Typical Output 60 μV/°C
Accuracy Refer to the Thermocouple Measurement section in the datalogger 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

Compatibility

Installation

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.

Multiplexers

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

Datalogger Considerations

Programming

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 datalogger 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.

Compatible Contemporary Dataloggers

CR200(X)
Series
CR800/
CR850
CR1000 CR3000 CR9000X CR300
Series
CR6
Series

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Frequently Asked Questions

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

  3. Yes. A reference temperature is required for the 105E-L thermocouple measurement. The datalogger wiring panel temperature is an appropriate reference temperature when the 105E-L is wired directly to the datalogger. 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. 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.

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