PT100 Temperature Sensor Brewing Accessories 1/4" Diameter 250mm Long Stem
Introduction
- PT100 temperature sensor is a platinum (Pt) made of a resistance temperature detector, its resistance changes with temperature change.
- When the PT100 at 0 degrees Celsius, it has a resistance of 100 ohms, its resistance as the temperature rises from approximately uniform growth.
- But the relationship between them is not a simple proportional relationship, but more should be close to a parabola.
PT sensor is resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum, nickel, or copper. The material has an accurate resistance/temperature relationship which is used to provide an indication of temperature. As RTD elements are fragile, they are often housed in protective probes.
RTDs, which have higher accuracy and repeatability, are slowly replacing thermocouples in industrial applications below 600℃
Functions
Resistance thermometers are constructed in a number of forms and offer greater stability, accuracy and repeatability in some cases than thermocouples. While thermocouples use the Seebeck effect to generate a voltage, resistance thermometers use electrical resistance and require a power source to operate. The resistance ideally varies nearly linearly with temperature per the Callendar-Van Dusen equation.
The platinum detecting wire needs to be kept free of contamination to remain stable. A platinum wire or film is supported on a former in such a way that it gets minimal differential expansion or other strains from its former, yet is reasonably resistant to vibration. RTD assemblies made from iron or copper are also used in some applications. Commercial platinum grades exhibit a temperature coefficient of resistance 0.00385/°C (0.385%/°C) (European Fundamental Interval).[6] The sensor is usually made to have a resistance of 100 Ω at 0 °C. This is defined in BS EN 60751:1996 (taken from IEC 60751:1995). The American Fundamental Interval is 0.00392/°C,[7] based on using a purer grade of platinum than the European standard. The American standard is from the Scientific Apparatus Manufacturers Association (SAMA), who are no longer in this standards field. As a result, the "American standard" is hardly the standard even in the US.
Lead-wire resistance can also be a factor; adopting three- and four-wire, instead of two-wire, connections can eliminate connection-lead resistance effects from measurements (see below); three-wire connection is sufficient for most purposes and is an almost universal industrial practice. Four-wire connections are used for the most precise applications.
Components
Common pt100 temperature sensing element have
- ceramic components,
- glass components,
- mica elements,
which are respectively made of platinum wire wound on a ceramic skeleton, the skeleton of glass, mica skeleton and then processed through a complex process.
Advantage:
- Excellent stability
- High accuracy
- Reliable performance
| Type | Range (℃) | Accuracy | Tolerance (℃) |
| Pt100 | 200~420 | A | ±(0.15+0.002|t|) |
| B | ±(0.30+0.005|t|) |
RTD Assemblies with Terminal Head and Direct Mount
Specifications
- Sheath Materials: 316 Stainless Steel
- Connection thread: 1/2″ BSP Process
- Class: “A” PT100 element
- Diameter: 6.4mm (1/4″) Diameter Stem
- L=250mm Long Stem
- Thermocouple Head: Large aluminium connection head IP65
- 3 Wire Ceramic terminal block
Very wide range of applications
- Medical
- Electrical
- Industrial
- Temperature calculation
- Calculation of high precision resistance temperature device.
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