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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Long Stem
