Resistance Temperature Detectors - RTD Products
World Class Resistance Temperature Detectors RTD Products www.rtd-products.co.uk
RTD Products - Company Overview RTD Products has focused and specialized on the manufacture of platinum wire wound RTD elements for more than 25 years. All our RTDs are manufactured at our factory in Southport, UK where we work to the regulations of the International Electrochemical Commission (IEC). Our in-house knowledge and experience along with our passion for world class quality and customer service has been key to our continuous growth and success and has resulted in RTD Products position as a worldwide leader in the manufacture of platinum wire wound RTD elements. Our dedicated sales and customer service team ensure that all our customers have the right RTD solution delivered to them on time. Along with our devoted and reliable customer service team, our technical support team is able to provide support to customers requiring more practical information. If you require the highest and most reliable quality of RTD, along with unrivalled sales, customer service and technical support please do not hesitate to contact us. 2
What is an RTD? If the 3.5following are key to your temperature measuring needs then the most effective temperature measuring device would be a Resistance temperature detector: 3 2.5 accuracy and stability accuracy over a wide temperature range area rather than point sensing would improve control a high degree of standardization Class B Class A 2 1/3 RTDs are a type of very accurate and precise thermometer. They function by exploiting the predict1/5 able1.5change in electrical resistance of certain materials with changing temperature. 1/10 1 The most commonly used metal in an RTD element is platinum, which has many characteristics that make it an almost perfect material for resistance temperature measurement. These characteristics 0.5 include its stability, high temperature rating, a near linear relationship between resistance and temperature and its ability to be heated and cooled repeatedly without negative effects. 0 -200 -100 0 100 200 300 400 500 600 The resistance of platinum changes in a positive and virtually linear fashion thus for each increase in temperature there is a directly proportional increase in resistance. 400 350 300 Resistance Ω 250 200 150 100 50 0 -200 -100 0 100 200 300 400 500 600 700 800 Temperature C Fig. 1 Resistance Temperature Curve for 100Pt Platinum RTD (α 0.00385) 3
Wire Wound RTDs A 100Pt wire wound RTD is constructed by winding fine platinum wire into a coil until there is enough to provide a resistance of 100 Ω. This coil is then inserted into a ceramic tube and threaded through 2 bore holes at the top of the ceramic (4 bore holes for a 2 coil, or Duplex, construction). Platinum Resistance Element Ceramic Housing Bore-Glass Seal Lead Wires Standard RTD elements usually range from 1 to 5mm diameter and 10 to 50mm in length. The construction, as shown above, allows the platinum coil to move freely within the ceramic sheath, helping give the RTD long term stability and resistance to vibration. The boreholes are backfilled with bore glass once the coils have been inserted giving additional support to the coils. RTD Products RTDs are capable of withstanding vibration and acceleration levels of up to 30g over the frequency range 10Hz to 1 kHz. Wire wound RTDs are the most accurate RTDs and designed for use in a wide range of applications. Platinum Thin Film RTD The thin film style of RTD is now the most common type of RTD due to the fact that it can be mass produced thus giving these RTDs a relatively low cost. Thin film elements are manufactured by depositing a thin layer of platinum on to a substrate. The metal is deposited in a specific pattern and then trimmed to a specific resistance. The element is then coated with either a thin layer of glass or epoxy for moisture resistance. These platinum RTDs are the least expensive to manufacture, can be mass produced and are relatively hard wearing. The also allow greater resistances (e.g. 1000 Ω) to be placed in smaller areas. 4
RTD Tolerances RTDs can be manufactured to different tolerances. Higher tolerances give temperature readings that have a much smaller margin of error relative to those with lower tolerances. A standard tolerance classification system has been defined and is used industry wide. The IEC system is seen as the industry standard, although there are other tolerance classes that exist. The IEC has industry standard classes of W0.1, W0.15, W0.3 and W0.6. These classes translate as follows in terms of resistance and temperature tolerances: IEC Standard DIN4370 Temperature Tolerance Ω at Tolerance at 0 C Range C 0 C W0.03 1/10 Din -100 to 350 100 0.012Ω 0.03 C W0.1 1/3 Din -100 to 350 100 0.04Ω 0.10 C W0.15 Class A (1/2 Din) -100 to 450 100 0.06Ω 0.15 C W0.3 Class B (Din) -196 to 660 100 0.012Ω 0.30 C W0.6 Class C -196 to 660 100 0.23Ω 0.60 C For example a W0.15 (Class A) RTD giving a reading of 0 C has a margin of error of 0.15 C or 0.06Ω. So a W0.15 (Class A) RTD could show a resistance of between 99.94 and 100.06 at 0 C. An RTD giving a resistance value of 99.77 at 0 C would be classed as a W0.6 (Class C) tolerant RTD. 3.5 3 2.5 Class B Class A 2 1/3 1/5 1/10 1.5 1 0.5 0 -200 -100 0 100 200 300 400 500 600 Fig. 2 Tolerances for RTDs as defined by IEC 60751 400 350 300 5
Industry Standards The relationship between platinum resistance and temperature is well understood and depending on the purity of platinum used the temperature coefficient differs. The most common type of RTD sensor is known as the Pt100, this is because the sensor has a resistance of 100 ohms at 0 C. There are RTDs with base resistance of 500 or 1000 ohms available on the market, but they are less widespread. The most widely used platinum is one defined by the IEC 60751 publication (International Electrotechnical Committee). IEC standard platinum has a temperature coefficient, or α value, of 0.00385 ohms/ohms / C. This means that for every degree change in temperature there is a resistance change of 0.385 ohms. So at 0 C the resistance is 100 ohms, at 100 C resistance 138.5 ohms. JIS standard platinum has a temperature coefficient, or (α) value, of 0.003916 ohms/ohms/ C. So a 100 ohm platinum RTD will increase in resistance by 0.3916 ohms for every 1 C of temperature increase. So at 0 C the resistance is 100 ohms, at 100 C resistance 139.16 ohms RTD Product Range Our standard* Platinum RTD Product Range is available in: 2 and 4 wire IEC Classes: W0.6, W0.3, W0.15, W0.1, W0.06 and W0.03 DIN Classes: Class C, B, A, 1/3 Din, 1/5 Din, 1/10 Din Lead length 6mm ( /-1mm) Temperature Range: -200 C to 660 C Pre-aged (as an additional service) Standard Calibration Point: 5mm from ceramic body Calibrated to IEC specifications Manufactured and tested to IEC specifications All RTDs are partially supported by aluminum oxide glass All RTDs are supplied with 2 lead wires for single and 4 lead wires for duplex to avoid resistance pollution All products are batch coded in order to ensure traceability Products are packaged to ensure safe and damage free delivery *Customer specific assemblies and tolerances are available on request 6
RTD Product Range Standard (2 wire) DUPLEX (4 wire) Diameter (mm) Length (mm) Lead diameter (mm) Lead Resistance Sensing Length PR0815 0.8 15 0.15 0.006398 13 PR0915 0.9 15 0.15 0.006398 13 PR1210 1.20 10 0.23 0.002721 8 PR1215 1.20 15 0.23 0.002721 13 PR1408 0.00 PR1415 1.40 PR1415D PR1425 PR1425D PR1515 PR1515D 15 0.23 0.002721 13 1.40 15 0.25 0.002303 13 1.40 25 0.23 0.002721 22 1.40 25 0.25 0.002303 22 1.50 15 0.23 0.002721 13 1.50 15 0.25 0.002303 13 PR1608 1.50 8 0.25 0.002303 8 PR1615 1.60 15 0.23 0.002721 13 PR1615D PR1625 PR1625D 1.60 15 0.25 0.002303 13 1.60 25 0.23 0.002303 22 1.60 25 0.25 0.002303 22 PR2006 2.00 6 0.25 0.002303 6 PR2015 2.00 15 0.35 0.001175 13 2.80 15 0.35 0.001039 13 PR2015D PR2808 2.80 8 0.35 0.001039 8 PR2815 2.80 15 0.35 0.001039 13 PR2815D 2.80 15 0.35 0.001039 13 2.80 25 0.35 0.001039 22 PR2825D 2.80 25 0.35 0.001039 22 PR3008 3.00 8 0.35 PR3015 3.00 15 0.35 0.001039 13 PR2825 PR3015D PR3025 PR3025D 3.00 15 0.35 0.001039 13 3.00 25 0.35 0.001039 22 3.00 25 0.35 0.001039 22 PR3208 3.20 8 0.35 0.001039 8 PR3215 3.20 15 0.35 0.001039 13 PR3215D 3.20 15 0.35 0.001039 13 3.20 25 0.35 0.001039 22 PR3225D 3.20 25 0.35 0.001039 22 3.80 15 0.35 0.001039 13 PR3225 PR3815 PR3815D 3.80 15 0.35 0.001039 13 3.80 25 0.35 0.001039 22 PR3825D 3.80 25 0.35 0.001039 22 4.50 15 0.35 0.001039 13 PR4515D 4.50 15 0.35 0.001039 13 4.50 30 0.35 0.001039 26 PR3825 PR4515 PR4530 7
RTD Products, part of the British Rototherm Group of Companies, is the UK’s leading manufacturer of platinum resistance temperature detectors and associated products. From our factory in Southport, Merseyside, the highest quality platinum resistance temperature detectors are manufactured and sent across the world. All devices are manufactured from traceable materials and their construction is controlled by our BS EN ISO 9001: 2008 approved Quality System, using the latest techniques in production and testing. RTD Products TM ISO9001:2008 RTD Products Units 10 & 11 A K Business Park, Russell Road Southport, Merseyside PR9 7SA Telephone: Facsimile: E-mail us : 44 (0) 1704 507696 44 (0) 704 507055 sales@rtd-products.co.uk RTD Products is part of the British Rototherm Group of Companies British Rototherm Co. Ltd. Kenfig Industrial Estate, Margam, Port Talbot SA13 2PW United Kingdom Registered in the UK. 2570730 at the above address. In keeping with RTD Products policy for continual product development and improvement, we reserve the right to amend specifications without notice. 2011 RTD Products. All rights reserved. Company registered in Wales : 2570730.
So at 0 C the resistance is 100 ohms, at 100 C resistance 138.5 ohms. JIS standard platinum has a temperature coefficient, or (α) value, of 0.003916 ohms/ohms/ C. So a 100 ohm platinum RTD will increase in resistance by 0.3916 ohms for every 1 C of temperature in-crease. So at 0 C the resistance is 100 ohms, at 100 C resistance 139. .
The RTD Series Precision RTD (Resistance Temperature Detector) Simulator provides a very broad-range of absolute resistance values that replace RTD’s,thermocouples. Thermocouples present a re-sistance that depends on the temperature. The RTD simulator effectively replaces an RTD to test, analy
The previous equations define the RTD resistance as a function of its temperature, R. RTD (t). However, to implement an RTD sensor interfacing circuit, the RTD temperature must be deter-mined, instead, as a function of its resistance, T. RTD (r). This may be less straightforward, given the
Table 2 lists the coefficients used in this equation for each of the TCR values that the [c]FP-RTD-124 supports. If you have a nonstandard RTD that does not match one of these linearization curves, measure the resistance with the [c]FP-RTD-124 and convert the resistance to temperature in the manner suggested by t
TX92 RTD Transmitter. The TX92 Two-Wire RTD Transmitter will produce a standard 4-20 mA output signal proportional to that produced by its RTD input temperature sensor. Transmission of the proportional current output may be accomplished by using copper wires. The TX92 RTD Transmitter accepts 100 Ohm, Plat
About the Excel RTD app The Excel RTD app lets you do two things: Put real-time data into Excel using only Excel's RTD() function. No macros; no . MT4/5: the app will report all the symbols which are included in the MT4/5 market watch . 2.2 Excel formula Once the RTD app is running, you can use the following formula in Excel to insert a .
the Resistance Temperature Detector (RTD), its construction, and how it operates. We saw that choosing one RTD type over another gave consideration to its physical construction, sensitivity, material and insulation, and temperature range. We also looked at the RTD Temperature Coefficient of Resistance (TCR)
4-Wire RTD or 3-Wire RTD (100 W platinum [PT100], D100, F100, PT385, PT3916, or user 0 W to 10 kW) (Selectable Offset compensation On or Off) For 3-wire RTD, dmm.connect dmm.CONNECT_FOUR_WIRE, 0.1 W lead resistance mismatching in Input HI and LO. Add 0.25 C/0.1 W of lead resistance mismatch. 4-Wire RTD –200 to 630 C 0.01 C 0.06 C 0 .
NORTH & WEST SUTHERLAND LOCAL HEALTH PARTNERSHIP Minutes of the meeting held on Thursday 7th December 2006 at 12:00 Noon in the Rhiconich Hotel, Rhiconich. PRESENT: Dr Andreas Herfurt Lead Clinician Dr Moray Fraser CHP Medical Director Dr Alan Belbin GP Durness Dr Anne Berrie GP Locum Dr Cameron Stark Public Health Consultant Mrs Sheena Craig CHP General Manager Mrs Georgia Haire CHP Assistant .
