semiconductor based temperature sensors

Semiconductor sensors give a linear output directly, so you skip the cold-junction compensation and polynomial math that thermocouples need. This makes data loggers simpler and reduces connection errors. They’re also more sensitive—commonly 10 mV/°C vs. 40 µV/°C for a thermocouple—so small temperature swings are easier to pick up. The trade-off is a narrower temperature range, but for most geotechnical work (-40°C to 125°C) that’s sufficient.

Yes, and that’s a common application. We provide versions with a rugged stainless steel housing and sealed cable entry that survive the alkaline environment of fresh concrete and the heat of hydration. They typically read well past the 28-day mark, helping engineers verify that temperature differentials stay within spec to prevent thermal cracking.

Initial accuracy is around ±0.5°C for most models, with better figures on request. Drift over a year is generally under 0.1°C if the sensor isn’t pushed to the temperature extremes constantly. We publish typical drift data from long-term tests in water baths; you’ll normally see the sensor settle within the first month and stay stable after that.

Standard analog versions output 0-5V or 4-20mA. If your system needs digital communication, we can build sensor nodes with RS485 Modbus or SDI-12 on custom order. This includes the sensor element, signal conditioning, and addressing in one weatherproof package. Lead time and cost depend on quantity and protocol specifics.

With voltage-output sensors, you run one per channel to avoid loading errors. For 4-20mA current loop types, you can wire several in series as long as the total loop resistance stays within the logger’s drive capability. We can help check the math for your specific logger model and cable run lengths—just send us the details.