A Pt100 probe (thermistor) is a passive temperature sensor. It is made of a semi-conductor material. Its resistance varies according to the temperature. There are two types of thermistors, NTC and PTC. The NTC (Negative Temperature Coefficient) are thermistors whose resistance decreases uniformly with temperature. PTC (Positive Temperature Coefficient) are thermistors whose resistance increases strongly with temperature in a limited temperature range (typically between 0 and 100°C), but decreases outside this area.
Thermocouples are the most common, convenient, and versatile sensors to measure temperature. A thermocouple consists of a "hot" junction between two dissimilar metals, (usually wire) and a reference junction at the opposite end. Heating the hot junction produces a temperature gradient which generates a small voltage proportional to temperature. Through proper selection of lead wires, sheath material, and connection heads, thermocouples are suitable for temperature ranges from -150°C to 2315°C.
| Manufacturer | Rosemount, Emerson Process Management - Prosensor |
| Fluids | Gases, Liquids, Vapor |
| Types | T, J, E, K, M, N, S, R, B, C, G, D |
| Temperature range | - 150°C to + 2315°C |
| Accuracy | +/- 1°C |
| Options | Dual elements, thermowells, transmitters |
| Advantages | Simple, rugged, inexpensive |
| Limitations | Must contact the target, accuracy |
Serv'Instrumentation
ZI Broteau Nord
Impasse Louis VERD
69540 IRIGNY
FRANCE
Phone : +33 (0)4 78 51 47 50
Fax : +33 (0)4 78 51 59 96