Can be used in a variety of applications
Overview
The 105E is a thermocouple designed to measure soil temperature. It easily interfaces with our dataloggers.
Read MoreBenefits 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
Images
Detailed 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.
Specifications
| 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 |
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| 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. | |
| CR300 | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| 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. | |
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
Additional Compatibility Information
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.
Data Logger 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 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.