Technical Information
All devices are manufactured from traceable materials and their construction is controlled by our BS EN ISO 9001: 2000 approved Quality System, using the latest techniques in production and testing.

Temperature Range
Normal operating temperature range is between -200ºC and +600ºC. Extra care, however, should be taken to avoid contamination of the Platinum wire above +450ºC by the correct choice of insulation materials, and protection sheaths.

Stability
Stability is greatly enhanced during the manufacturing process when all detectors are subject to pre-aging at elevated temperatures. All devices easily comply with the requirements of BS EN 60751:1996 showing a typical ice point shift of no more than 0.05% when subjected to 10 consecutive cycles between -200ºC and +600ºC.

Vibration
When correctly housed, standard detectors are capable of withstanding vibration and acceleration levels of up to 30G over the frequency range 10Hz to 1 kHz.

Pressure and Moisture
Detector accuracy wilL remain unaffected by large changes in pressure. They are NOT, however, hermeticaIIy sealed. Therefore devices must be housed in suitable protective sheaths when in contact with fluids or saturated atmospheres.

Self Heating
All detectors comply with the requirements of BS EN 60751:1996 and will show rises of less than 0.3ºC in a stirred ice bath while dissipating 10mW. However, with the more usual 1mA measuring current the rise for a typical detector would be less than 0.002ºC.

Construction
Detectors manufactured by RTD Products are of the partially supported, wirewound type which offer the user, the best available balance of accuracy, stability and ruggedness. They are produced in a comprehensive range of standard diameters and lengths. Non standard sizes are also available - please contact the sales department.

Tolerances
Detectors are available in the two BS EN 60751:1996 tolerance classes A or B. Class A is the closer tolerance device offering an interchangeaility of +/-0.06 Ohms (0.15ºC) at 0ºC. The figures for class B are +/-0.12 Ohms (0.3ºC) at 0ºC.

Closer tolerance devices are available, commonly known
as 1/3, 1/5, or 1/10 DIN. these offer tolerances of 1/3,
1/5 or 1/10 of the class B figures shown above. Detectors
can also be made to the Japanese/American standards
JIS C1604:1997, and the aircraft specification BS2G.148
(PT130 Ohm).

Lead Resistance
Devices up to 1.6mm dia are fitted with pure Platinum leadouts, larger sizes use Platinum / Palladium wires. In all cases lead length is 8mm minimum. Longer leads are available at extra cost.

Lead resistance values are as follows:

Leads
Detector leadouts are designed to withstand a straight pull of 500 or 2000 gf depending on size, however the ceramic body and the glass anchoring the leads will be damaged by excessive bending or twisting. Ideally, extension leads should be spot welded, but brazing or soldering will be satisfactory provided ALL traces of flux residue are removed.

Calibration
The specific calibration point for all detectors is 5mm from the ceramic body. Certification of calibration traceable to UKAS at specific temperatures (normally 0ºC or 100ºC) can be provided from our comprehensive calibration laboratory at extra cost.

Winding Details
The Platinum wire is wound into a very small coil which is inserted into the bores in a high purity alumina tube, where it is “partially supported” by a small amount of high temperature glass. This form of construction results in a detector combining excellent stability with good resistance to high levels of vibration. Duplex winding are also available.

Telephone: +44 (0) 1704 507696
Facsimile: +44 (0) 1704 507055
E-mail: liz@rtd-products.co.uk

RTD Products
Units 10 & 11 A K Business Park, Russell Road
Southport PR9 7SA   Merseyside

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.

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