semiconductor temperature sensor

Semiconductor sensors usually give higher sensitivity—meaning a larger signal change per degree—so you can use simpler readout equipment and detect small temperature shifts more easily. They also don’t need cold-junction compensation like thermocouples. The trade-off is a narrower temperature range (typically -50°C to +150°C) and slightly lower accuracy at extremes. For most geotechnical applications, like concrete curing or ground temperature monitoring, this range is more than enough. We often see less drift over multi-year deployments compared to thermocouples, which is why many dam safety projects use them.

Yes, that’s a big part of what we do. If your data acquisition system expects a specific resistance curve—say a 30kΩ thermistor at 25°C—we can source elements with that profile. The same goes for probe dimensions: we’ve built sensors as slim as 3mm diameter for lab models and as bulky as 20mm with a flange for dam concrete. Just send us your requirements; we’ll propose a design and usually deliver within 2-3 weeks after approval.

Our standard housing is 316 stainless steel with epoxy-potted transitions, which handles permanent submersion in water up to several bars. For deep boreholes or downhole applications, we can upgrade to welded construction and higher-pressure-rated seals. We’ve deployed sensors at depths of 200 meters in groundwater monitoring wells without failure. If you have a specific pressure rating in mind, let us know—we’ll confirm compatibility.

The most common is a two-wire resistance output, which works with any data logger that can measure resistance. For longer cable runs or plant environments, we often integrate a 4-20mA transmitter inside the sensor head, so you get a current signal immune to line resistance. Some clients ask for 0-5V or Modbus RTU outputs; those can be arranged with a separate interface module. Just tell us what your logger needs, and we’ll match it.

Yes, we can supply a calibration certificate traceable to national standards for an additional charge. We test each sensor at three or more temperature points, typically in an oil bath, and provide the measured resistance values. For large orders, we often batch-test and can include statistical data like maximum deviation. If your project requires ISO 17025 calibration, we can arrange that through a partner lab.