Precision Thermistor Sensors for AirTemperature Measurements
Ideal Thermistor Sensor for Measuring Air Temperatures in Laboratories and Laminar Flow Systems. Metal or Plastic Cage Provides Protection for Thermistor Sensor While Leaving it Open to the Air Flow. Thermistor Element is Epoxy Coated and Extends Into the Air Flow for Fast Temperature Response. ON-905 and ON-906 Models Available with Resistances of 2252 Ω, 3000 Ω, 5000 Ω, 10.000 Ω and 30.000 Ω at 25°C. ON-405 and ON-406 Available with 2252 Ω at 25°C Only. More
Item# (PN): ON-405-406-905-906 Shipping and Payment
The exposed thermistor element with protective cage design makes this an ideal selection for the measurement and control of air and gas streams in a variety of applications. The protective cage is available in plastic or metal.
ON-905 and ON-906 models are available in five electrical resistance specifications (2252, 3000, 5000, 10.000 and 30.000 Ω) and have stripped lead ends.
ON-405 and ON-406 are only available with a resistance of 2252 Ω and the lead wires are terminated with a jack type connector (suitable for some types of OMEGA instruments).
Maximum temperature is 75°C or 100°C depending on the model.
Complete informations can be found in the spec sheet (PDF), see the "Download" section.
RTD Pt100 vs Thermocouple
It is not practical to compare RTDs (Pt100 and others) and thermocouples generally. However, if we compare their performance in terms of specific criteria, we can see which is best suited for specific applications. Thermocouples are best for working at high temperatures. New manufacturing techniques have improved the measurement range of RTD probes, but more than 90% of RTDs are designed for temperatures below 400°C.
In contrast, some thermocouples can be used at up to 2500°C. Thermocouples are generally cheaper than RTDs...
Origin Story of the RTD / Pt100
The same year (1821) that Thomas Seebeck made his discovery about thermoelectricity (Seebeck effect, see thermocouples), Sir Humphrey Davy announced that the resistivity of metals showed a marked temperature dependence. Fifty years later, Sir William Siemens proffered the use of platinum as the element in a resistance thermometer. His choice proved most propitious, as platinum is used to this day as the primary element in all high-accuracy resistance thermometers, Pt100, Pt1000 etc.
In fact, the Platinum Resistance Temperature Detector, or RTD Pt100, is used today as an interpolation standard from the oxygen point (-182.96°C) to the antimony point (630.74°C)...
What are RTD temperature sensors?
RTDs or Resistance Temperature Detectors, are temperature sensors that contain a resistor that changes resistance value as its temperature changes. The most popular RTD is the Pt100. They have been used for many years to measure temperature in laboratory and industrial processes, and have developed a reputation for accuracy, repeatability, and stability.
Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it...
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