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Overview

Accurate, reliable, RTD platinum elements for high performance applications

The PTF family combines a group of resistance temperature detectors (RTD) using a Platinum resistor element utilizing the latest in thin film technology. It consists of a structured platinum film on a ceramic substrate, passivated by a glass coating. The connection wires are protected with glass on the welding area. The characteristic curve of this Platinum RTD complies with DIN EN 60751. The usage of Platinum as the resistive material provides excellent long-term stability. Due to small size and low mass, this RTD has a fast response time and low time constant; therefore, it is an optimal solution for fast and precise feedback control systems.

Benefits

  • Conforms to DIN EN 60751
  • Wide operating temperature range: -50°C to +600°C (Ni/Au wire and Class F 0.3, Ag-Wire versions are limited to 300°C)
  • Very low drift over lifetime
  • Fast response time due to low thermal mass
  • Standard nominal resistances values: R0: 100 and 1000Ω (others available upon request) Class F 0.1 (T = AA), F 0.15 (A), F 0.3 (B) and F 0.6 (C) accuracy
  • Variety of outline dimensions available to fit a wide range of space requirements
  • Global interchangeability

Applications

  • Temperature feedback control 
  • White goods: stoves, grills and food processing
  • Industrial applications: HAVCR and generators
  • Automotive: batteries
  • Medical: patient monitoring
  • Sensing element for plug-in probes
platinum thin film elements infographic
  1. Platinum Thin Film Elements Product Overview (English)

TE Connectivity’s (TE) platinum thin film elements provide high accuracy and stability, with a competitive selection of sizes and standard values for high performance applications.

FAQ

Frequently Asked Questions

Q: What does Pt100 and Pt1000 stand for?

These are designations for the base resistance at 0°C for platinum thin-film elements that are generally associated with a TCR of 3850ppm/K.  Other base resistance values include Pt200 and Pt500 for 200Ohm and 500Ohm Pt elements and Ni1000 for a 1000ohm nickel elements.

 

Q: Why are Pt thin films offerend in a variety of sizes, which one should I choose?

A: There are four different standard sizes available in the PTF family (L x W x T)

  • PTFC outline – 2.0 x 2.3 x 1.1mm
  • PTFD outline – 2.0 x 5.0 x 1.1mm
  • PTFF outline – 2.0 x 4.0 x 1.1mm
  • PTFM outline – 1.2 x 4.0 x 1.1mm

For a new application, we would typically recommend the PTFC outline as it has a relatively low unit price and will fit into a variety of housings for value added probes and assemblies.  Other sizes are available that allow for smaller outline dimensions where size or time response is critical. Larger sizes are available to match existing applications that utilize a larger size or that require more power. The table below summarizes some of the characteristics based on the size of the element

Smaller element Larger element
Faster response time Slower response time
Larger self-heating coefficient Smaller self-heating coefficient
Lower recommended measuring current Less self-heating error at the same power
Fits into housings with smaller ID Has a larger contact area for sensing

 

Q: What is the self-heating coefficient?

A: The self-heating coefficient defines the amount of self-heating or rise in temperature for the element based on the amount of power through the element.  This self-heating or rise in temperature is not desirable as it will potentially introduce errors into the temperature measurement.  For example, the PTFD outline has a self-heating coefficient in air flowing at 1 m/s of 0.33°C/mW which means that for each mW of power through the device will cause a rise in the temperature of the element of 0.33°C beyond the ambient temperature.  A rule of thumb is that self-heating errors should be limited to no more than 10% of the desired accuracy.  So for example, a PTFD element with a Class A tolerance class, would have an accuracy of ±0.15°C at 0°C.  Therefore, the error from self-heating should be limited to 0.015°C which would imply power be limited to ±0.015°C / 0.33°C/mW = 0.045mW.  Since power for a resistive element like an RTD is equal to I2R, Max I = SQRT(0.045mW/100Ω) for a Pt100 element or .0213A or 21.3mA.

 

Q: What is TCR and how is it calculated?

A: TCR is an abbreviation for thermal coefficient of resistance and is the average resistance increase per K of a hypothetical RTD measuring 1Ω at 0°C.  TCR is similar to alpha (α) which is generally associated with thermistors.  TCR is the average change in resistance between 0°C and 100°C and is calculated using the formula: TCR=(R100-R0)/(R0*100)°C.

 

Q: How do I calculate the resistance for Pt thin film elements at temperatures other than 0°C?

A: The calculation formula for a Pt-RTD is defined in DIN EN 60751 and is as following:

For T ≥ 0 °C: RT = R0 * (1+a * T + b * T2)

For T < 0 °C: RT = R0 * [1+a * T + b * T2 + c * (T-100°C) * T3]

Coefficients: a = 3.9083E-03 b = -5.775E-07 c = -4.183E-12

 

Q: What is the temperature tolerance at temperatures other than 0°C?

A: The accuracy for these RTD elements is defined in DIN EN 60751 and follows the formulas as listed below

Tolerance Class Interchangeability Temperature Range Tolerance
F0.1 (T=AA) ± (0.1+0.0017*|T/°C|) °C  (-30 … +200 °C) 
F0.15 (A) ± (0.15+0.002*|T/°C|) °C  (-30 … +300 °C) 
F0.3 (B) ± (0.3+0.005*|T/°C|) °C  (-50 … +600 °C) 
F0.6 (C=2B) ± (0.6+0.007*|T/°C|) °C  (-50 … +600 °C)

Where |T/°C| is the absolute value of the temperature in °C

 

Q: What is the difference between the two types of lead wires offered – Gold-coated nickel wire and Silver wire? 

A: The Au-coated Ni wire allows for operation over the entire temperature range up to 600°C while the Ag wire is limited to operation up to 300°C.  The Au-coated Ni wire is typically used when the connections to the element will be made via welding or brazing while the Ag wire is better suited for soldering.

 

Q: Can the elements be operated outside of the temperature range noted for each accuracy class?

A: The Pt thin film elements are all manufactured using the same materials and processes, but they are tested and calibrated based on their corresponding accuracy class.  That means that every element can operate over the full range from -200°C to +600°C (for Au-coated Ni wire) but, if the element is operated outside of the accuracy temperature range that the calibrated accuracy can no longer be guaranteed.  For example, class A or F0.15 accuracy class elements are calibrated to a the accuracy defined in DIN EN 60751 over the temperature range from -30ۦC to +300°C.  Operation outside of that range will not damage the element but it may cause slight shifts in the part’s calibration and the original accuracy specifications can no longer be guaranteed.

 

Q: What specificaitons apply for these Pt thin film elements?

A: The PTF family is designed and manufactured to meet the DIN EN 60751 specification.  The IEC 60751 and ASTM E1137 specifications are very similar.  The IEC 60751 and DIN EN 60751 specifications are identical. The DIN specification is basically the IEC specification with a cover page added.  The DIN EN 60751 and the ASTM E1137 are very similar as both specifications apply to the standard 3850ppm/K temperature coefficient platinum curve and are based upon the ITS-90 temperature scale. One primary difference between the two specifications is the definition of tolerance classes, as follows

 

DIN EN 60751 DIN EN 60751 ASTM E1137 ASTM E1137
Tolerance class Tolerance definition Tolerance grade Tolerance definition
Class F0.3 (Class B) ±(0.3 + 0.005 |T|) Grade B ±(0.25 + 0.0042 |T|)
Class F0.15 (Class A) ±(0.15 + 0.002 |T|) Grade A ±(0.13 + 0.0017 |T|)

Where |T| is the absolute value of the temperature in °C

 

Q: Is there an ability to create a custom packaging for the assembly in addition to the element? 

Yes, TE Connectivity specializes in valued added probes and assemblies and does offer a number of standard and custom RTD assemblies that can be manufactured to match the exact needs of a customer.  The assembly can consist of something as simple as an added piece of heat shrink tubing over the element along with larger AWG# extension leads to fully ruggedized assemblies with metal housing, extension leads, encapsulants and connectors. Learn more about RTD Probes&Assemblies

 

 

 

These are designations for the base resistance at 0°C for platinum thin-film elements that are generally associated with a TCR of 3850ppm/K.  Other base resistance values include Pt200 and Pt500 for 200Ohm and 500Ohm Pt elements and Ni1000 for a 1000ohm nickel elements.
These are designations for the base resistance at 0°C for platinum thin-film elements that are generally associated with a TCR of 3850ppm/K.  Other base resistance values include Pt200 and Pt500 for 200Ohm and 500Ohm Pt elements and Ni1000 for a 1000ohm nickel elements.

Features

Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Model Number  PTFC101A1A0, PTFC101A1G0, PTFC101B1A0, PTFC101B1G0, PTFC101T1A0, PTFC101T1G0, PTFC102A1A0, PTFC102A1G0, PTFC102B1A0, PTFC102B1G0, PTFC102BC1G0, PTFC102T1A0, PTFC102T1G0, PTFD101A1A0, PTFD101A1G0, PTFD101B1A0, PTFD101B1G0, PTFD101T1A0, PTFD101T1G0, PTFD102A1A0, PTFD102A1G0, PTFD102B1A0, PTFD102B1G0, PTFD102T1A0, PTFD102T1G0, PTFF101B1A0, PTFF101B1G0, PTFF102B1A0, PTFF102B1G0, PTFM101A1A0, PTFM101A1G0, PTFM101B1A0, PTFM101B1G0, PTFM101T1A0, PTFM101T1G0, PTFM102A1A0, PTFM102A1G0, PTFM102B1A0, PTFM102B1G0, PTFM102T1A0, PTFM102T1G0

  • RTD Element Type  Platinum Thin Film Temperature Element

  • Element Material  Platinum

  • Lead Wire Style  Ag, Ni/Au

  • Wire/Cladding Type  Ag, Ni/Au

Configuration Features

  • Connector Type  Open Ends

Dimensions

  • Width (Body) (mm) 1.2, 2

  • Width (Body) (in) .047, .078

  • Length (Body) (mm) 2.3, 4, 5

  • Length (Body) (in) .09, .157, .197

  • Wire Diameter (mm) .2, .25, .3

  • Wire Diameter (in) .007, .009, .011

  • Wire Length  10 mm [ .393 in ]

  • Height (Body)  1.1 mm [ .043 in ]

Usage Conditions

  • T_ref for Resistance (°C) 0

  • Maximum Temperature (°C) 200, 300, 600

  • Maximum Temperature (°F) 392, 572, 1112

  • Accuracy (at T_ref) (°C) ± .1, ± .15, ± .3

  • TCR at (T1 and T2) (ppm/°C) 3850

  • T1 and T2 for TCR (°C) 0 and +100

  • Ambient Temperature Range (°C) -200 – 200, -30 – 200, -30 – 300, -50 – 300, -50 – 600

  • Ambient Temperature Range (°F) -22 – 392, -22 – 572, -328 – 392, -58 – 1112, -58 – 572

  • T_ref for Accuracy (°C) 0

  • Resistance (at T_ref) (Ω) 100 (0 °C), 1000 (0 °C)

Packaging Features

  • Element Package  Ceramic

Other

  • Tolerance Class  Class A / F0.15, Class B / F0.3, Class T (AA) / F0.1

  • Wire Count  2

Reference Number

  • TE Internal Number CAT-RTD0046

Related Materials

Datasheets & Catalog Pages

Terms and Conditions

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Disclaimer:
This information has been provided to your free of charge for your use but remains the sole property of TE Connectivity Corporation (''TE'') or SnapEDA,  Inc. or Ultra Librarian/EMA Design Automation, Inc. (collectively, "Company"). While Company has used reasonable efforts to ensure its accuracy, Company does not guarantee that it is error-free, not makes any other representation, warranty, or guarantee that the information is completely accurate or up-to-date. In many cases, the CAD data has been simplified to remove proprietary detail while maintaining critical interface geometric detail for use by customers. Company expressly disclaims all implied warranties regarding this information, including but not limited to any implied warranties or merchantability or fitness for a particular purpose.