RTD Temperature Sensor Assemblies I YAGEO Nexensos

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YAGEO Nexensos not only supply a wide range of platinum RTD elements but also temperature sensor assemblies in various formats. Of all the numerous sensor designs, two of the most interesting are as follows;

EC3032 temperature sensors are high integrity, encapsulated RTD sensors primarily designed for use in e-vehicle e-motor applications. Their small size and IP68 insulation rating makes them ideal for use in the e-motor stator windings and they are also impervious to varnish ingress and other fluids such as oil or grease. Using a Pt1000B element as standard, the 410mm PTFE long leads make this a very versatile sensor that can be used from -50°C to +200°C.

Our PCB RTD temperature sensors are basically chip RTD elements pre-soldered onto printed circuit boards (PCBs) originally designed for use in domestic calorimeters. The PCB has a meandering, zigzag circuit path to help minimise heat loss from the RTD to improve temperature measurement accuracy. These RTD PCB sensors are sometimes preferred to NTC versions, as their inherent long-term stability is extremely important when accurately measuring and apportioning consumer energy consumption in district heating systems.

At ATC Semitec, we listen to your requirements and preferences, then work with experts in YAGEO Nexensos to supply you with anything from a simple part modification, to a totally new product development. As well as standardised products, for volume applicatoins we produce solutions according to your needs and budget.

For further technical information on Platinum Sensors, see our Frequently Asked Questions section

Call us today on 01606 871680 or complete the Contact us form, to discuss your application’s thermal sensor requirements. Using our extensive technical knowledge and innovative supplier base, we will work with you to provide the optimum solution for your product.

YAGEO Nexensos PCB Platinum Sensors
These YAGEO Nexensos p.c.b. temperature sensors use SMD Pt100 (or Pt500 or Pt1000) chip elements to create a very neat solution for calorimeters and other heat-source measurement devices.
Pt100, Pt500 or Pt1000 Options
Available on 3 different p.c.b. sizes
Temperature range; -40°C to +150°C
View Product Details
Yageo Nexensos PCB2225 RTD SMD- PCB Sensor Assembly.pdf
YAGEO Nexensos EC3032 IP68 E-Motor Temperature Sensor
The YAGEO Nexensos EC3032 E-motor Pt1000 temperature sensor is ideal for e-vehicle motors and other high end electric motor applications. The EC3032 is a fully encapsulated, IP68 rated sensor. Qualified to IATF 16949 standards.
IP68 Encapsulated Temperature Sensor
Pt1000B High-Integrity Element
200°C Continuous (250°C short-term)
View Product Details
Yageo Nexensos EC3032 IP68 RTD Sensor Datasheet.pdf
YAGEO Nexensos W-SZK RTD Surface Temperature Sensor
The YAGEO Nexensos W-SZK sensor is a robust platinum temperature sensor with a single-hole mounting option. The tough PPE encapsulated housing is fitted with 2.5m long 24AWG double-insulated cable.
Pt100 or Pt1000 sensor enclosed in tough PPE housing
Single mounting hole for ease of fixing
For use from -20°C to +110°C
View Product Details
Yageo Nexensos W-SZK Pt Surface Temperature Sensor Datasheet.pdf
IP68 RTD Temperature Sensor Probes
Our IP68 platinum temperature sensors offer an even higher water-proof integrity than the W-SZK type. Water ingress is not an issue and these probes are available with Pt100, Pt500 or Pt1000 RTD elements.
IP68 waterproof temperature sensor
Use from -50°C to +110°C (125°C short term use)
Single & double-insulated versions with dielectric up to 3.75kV
View Product Details
IP68 Platinum RTD Temperature Sensors.pdf

What is the current self-heating effect of the Pt100?
The current self-heating effect in a platinum sensor element has to be carefully considered to avoid errors in temperature measurement. Applying too much measuring current to a Pt100 or Pt1000 element will result in it warming up by an amount that will create an offset between the exact temperature and the element temperature.
Each element datasheet shows a value for this self-heating in K/mW and it also shows a value for the maximum measuring current that should be applied. As this self-heating value is determined at 0°C, it is not representative of many applications the sensor will be used in. So it should be primarily used to compare between different element types.
Also if you put the platinum element inside a probe, then the extra thermal mass helps to effectively lower the self-heating value. Conversely if you use a platinum sensor in a full or partial vacuum, then the self-heating value can increase due to the reduced thermal conductivity of the surrounding medium.
Finally self-heating can be used to good effect in air-flow measurement applications where two platinum elements are used together in a comparator network. One is self-heated and the other acts a reference sensor, so that the airflow over the self-heated element can be measured by a calculation derived from experimental observation.
Have a question or need a sample ? Call one of our engineers today on 01606 871680
How is the temperature coefficient of a Platinum RTD Element defined?
The temperature coefficient, also referred to as the “alpha value”, is the average change in resistance between 0 and 100 °C, and calculated using the formula.
Where R100 is the resistance at 100°C and R0 is the resistance at 0°C.
YAGEO NEXENSOS supplies Thin Film Platinum RTD Elements with the following temperature coefficients:
3850ppm
3750ppm (Pt1000 only)
3770ppm (Pt200 for automotive application only)
Have a question or need a sample ? Call one of our engineers today on 01606 871680

Which Pt100 /Platinum RTD Sensor should I use for my application?

For a new application, we typically recommend the YAGEO Nexensos M222 type (2.3mm L x 2.1mm W). The M222 has a relatively low unit price, and will fit in a variety of probe sizes. For existing applications, a larger size element, such as the M1020 (9.5mm L x 1.9mm W) may be required to match an existing size footprint.

The following table summarises some size dependent properties.

Smaller element	Larger element
Faster response time	Higher source currents possible
Higher self-heating constant	Lower self-heating constant
Self-heats at lower power	Requires higher power to self-heat
Fits in small ID sensor housings	Larger contact area for surface mounting

Have a question or need a sample ? Call one of our engineers today on 01606 871680

Which YAGEO NEXENSOS RTD element should I choose for my application ?

Our YAGEO Nexensos Thin Film Elements differ primarily by their operating temperature range.

The table below summarises the various types. It is important that the min/max operating temperature of your application falls within the operating range specified. Using a part outside the rated operating range may produce unpredictable results.

For detailed information please see individual data sheets on our website or call our engineers on 01606 871680.

Element Type	Operating Temperature	Lead Wire Material	Recommended Connection method
C	-196 to +150°C	AgPd	soft soldering
L/LN	-50 to +400°C	AgPd — silver coated Nickel	soft soldering
M/MN	-70 to +500°C	Ni/Pt — Nickel	hard soldering, welding, crimping
HM	-70 to +600°C	PtPd	Hard soldering, welding
HL	-70 to +750°C	Pt/NiCr	hard soldering, welding
HD	-70 to +850°C	Pt	hard soldering, welding

Which applications would use a PRTD sensor?
Thermistors, thermocouples and RTD Sensors are all used to measure temperature. However, in particular circumstances when greater precision, coupled with longevity and stability are required ATC Semitec recommend a Pt100 (Resistance Temperature Detector) should be used.
RTDs give excellent linearity across a wide and high temperature range. This means that as the resistance increases the temperature also increases and therefore can be measured. In comparison to thermistors and thermocouples their stability reduces above certain temperatures.
Based on high precision, accuracy, stability and longevity Pt100, Pt1000 are ideal for use, and frequently used in the following applications:
HVAC
Automotive (Measuring engine temperature, oil level sensors, intake air temperature)
Consumer Electronics
Food handling, processing
Medical Electronics
Military
Aerospace
Other industrial processes
In these situations, it is recommended that a Platinum RTDs is used as it offers the most stable resistance/temperature relationship compared to Nickel or Gold RTDS.
For help with identifying the correct PRTD for your application contact our technical engineers at ATC Semitec on 01606 871680

Thin-film or Wire-wound platinum RTD Elements – which should I choose?

The type of platinum element to be used is usually guided by the requirements of the specific application. The size of the sensor it needs to fit inside, the temperature range to be measured and the accuracy of the element are the key parameters.

Thin-film elements are intrinsically vibration-resistant and lower in cost than wire-wound elements, so thin-film elements meets the needs of the majority of temperature sensing applications.

Wire-wound elements can offer smaller sizes, cylindrical formats and much higher levels of accuracy, e.g 1/5thDIN (W0.06) and 1/10thDIN (W0.03).

The following table summarises the advantages of each type:

THIN-FILM ELEMENTS Advantages	WIRE-WOUND ELEMENTS Advantages
Low-cost	Higher 1/5DIN & 1/10DIN accuracies
Fast response time	Smaller diameters possible
Low thermal mass	Wider operating temperature range
High vibration resistance	Tight tolerance temperature range
High thermal shock resistance	Customisable R0 values
Small size footprint	Larger diameter lead wires

Have a question or need a sample ? Call one of our engineers today on 01606 871680

What is a Pt100 temperature sensor?
Pt100 temperature sensors are platinum sensor elements with a resistance of 100ohms at 0°C. The Pt100 is a temperature sensor in which the resistance changes linearly with temperature. Therefore, by simply measuring a sensor’s resistance, the Pt100 can be used to measure temperature.
Thin-film Pt100 sensors are manufactured by depositing a thin layer of high purity platinum onto a ceramic substrate in clean room conditions. A pattern is then etched onto the element, thus creating the electrical circuit. They are then terminated and sealed with a glass coating, which accounts for their very long term stability and durability.
They are a very popular choice across many different industries due to their characteristics of long-term stability, linearity, accuracy and repeatability.
Whilst the Pt100 is the most common sensor, other variations are available, and the notation used is as follows;
“Pt” followed by a number (say 100), refers to the resistance value at 0°C. Ro resistance values available are 100 ohms (Pt100), 200 ohms (Pt200), 500 ohms (Pt500), 1000 ohms (Pt1000), 2000 ohms (Pt2000) and even 10000ohms (Pt10000).
Have a question or need a sample ? Call one of our engineers today on 01606 871680