Experiment No:1 Aim: To Study various Temperature Measuring Instruments and to Estimate their Response times. Platinum Resistance Temperature Detector Svetlana Avramov-Zamurovic, Carl Wick, Robert DeMoyer United States Naval Academy Abstract This paper describes the use of a platinum resistance temperature detector to develop a calibration experiment and to introduce metrology principles. 0000076051 00000 n The platinum is an unreactive metal and can easily be drawn into fine wires. )[email protected]`9AA�d�[email protected]�j ��F`����{�\C>2�3�c��0�a;S���� %PDF-1.4 %���� Definition: The platinum thermal resistance (PTR) uses platinum for determining the temperature. 0000033675 00000 n The ordinary polynomial fit of higher order (fifth and higher) is derived from the CVD equation. 2. 32 0 obj <> endobj Platinum Resistance Thermometer. While, the ITS-90 equation is usually used for the presenting of the results of the SPRTs calibrated at fixed points. A simple experiment is proposed and the least square fit is used to estimate the parameters. H�l�Mo�0����� )��0�=���x���V\t�~��d];�B(&�����/�~rYL΋B �b=�s�~>RrY.1�,���0�L�1�A�/��`>�X|���Q�y0#T��� �8?���,�^U����ՠ�f� S�>_'�#ϒ�z�T�kK[����ʴk��v��`F2hB�20�n��6C��J��0�&���"�B���eN6s��_oG�1g\B$SLs&��4��x�Ik|hr�#���mr�/���1✣�,�n�G�h&.5����ȹ���ͦZ������V/w��m�pAj���\y\L�C�}w��z[D(��kLF��^�TVw~0�F�TRĉ�9� өc�Q�{#�?����j=�g� aQ>��۶��p�P��Mٚ��(A!R����27F� ���8ùnW�֯z ����{�am:�F �9��Q!�y�����l6�=o�u�ʹ�m�{ ���݆�����%E� ��l�������79mʪ�;���ዧ�v���g�P�2�ӣ)T{G�1������;�����jO ���[��J�6��;]7��붧?^*� � ��0 endstream endobj 52 0 obj <>stream Introduction Electrical resistivity of metals and semiconductors increases when they are heated. It is referred to as a temperature sensor. It is only used when high accuracy is not required as the resistance of the connecting wires is always included with that of the sensor leading to errors in the signal. 4 0 obj In each cycle the resistance of each spiral was measured at temperature of 0, 450 and 600 °С determined with a reference thermometer. 0000001857 00000 n 0000141108 00000 n thermometers), or SPRTs (standard platinum resistance thermometers). Platinum Resistance Thermometers J. P. Evans National Bureau of Standards, Gaithersburg, MD 20899 Accepted: July 17, 1984 ... mometers that were used in the present experiments. PlatinumThermometryat11iffhTemperatures. The platinum-resistance thermometer is a standard type, calibrated from the ultimate but inconvenient temperature reference of a gas expansion thermometer. The thermometer measures the temperature over the range of 200°C to1200°C. 0000153590 00000 n The resistance increases linearly at 0.385 Ohm/°C. ��6�&We2tw)�6�q�.ί��s�L����á�/e�AQ����ӡ����^�pi[���l�W-�����0K'_��l�B���@��VѤks ��o�á>���^o� Z{���Q����A� }f�[email protected]*��ǁw"x�����F��&[�����i�dB/��cpA$�����pW.�.=���M��巛|��ί�;��x��v�шSN= �9fh�Tb��{�.ke�d��:����v`~�$�@�����V�ӽ�� q �ػ=�&��6��[email protected]��U8��JR�98�9�aA�$m��T��Ul�"�҇oڏ�5q9'杝�-�=hy3v�� r�jD��МiB_�X�" �uӴ.\��}��om&���S��f�����S�]$+��A���M��^�4���*|�ҹ�E�҈�������^�}�I�*(�e��U��Ȏe��c���a�������[��� r�'M66��I�l�HR�S��c���� �_���V���R���B�� ��{���� %1� The most common by far is the Platinum RTD. ^uraZT.'] trailer platinum resistance thermometer is distorted by the oxidiza-tion of a platinum sensing wire, which depends on the partial pressure of oxygen in a thermometer sheath.1–4) A small amount of oxygen, less than 10kPa at room temperature, is sealed in a sheath of the standard platinum resistance thermometer. 0000089551 00000 n endstream endobj 51 0 obj <>stream 0000009285 00000 n 0000004263 00000 n {�����b��WM���F��z�-�0޶��Wu����^�p�Rvm�l�*U;MP����r�i���Q6χ�^����I�@����)9���pH�\-C�� Calibration Equations An inverse calibration equation was used to describe the relationship between the temperature (Ts) and resistance (Rs) of Platinum. <]/Prev 247382>> The platinum resistance thermometer was develop- ed into a successful and accurate instrument by Callendar. <> 0 H�TS�r�0��(����[�5��F��#�6�ʈ�=��H*V["��],4�r��\rY�������� `x�쟞g�^��Kf2*c��_Y�{�ix9��rFH^ M���$φ7��E,�m ��o�We�A�!����~]���͒ռa6��{�M�$���BSm%pQ�m�1,�.w3i�W �&S���r���C_Z�۪ӳ���-��=/�$/'z�z ���W������#ky���,ox���g��)G�O�rc,#����nY(":����?2}�E�!���0�I�W���/ To develop a voltage a suitable resistance should be connected between output and +5V and the wire-wound potentiometer is recommended. 0000001518 00000 n In preparation for the ITS-90 many National Laboratories designed Platinum Resistance Thermometers that would work to the Gold Point of 1064°C. Ŕ�ic���%�qd%�pL�0�E�c�r1���q�1���Bp��\U��&��ʎ�&�����/0��G�Z�P�f5�p��IɪHNo~!1MS1#�G:=e;���h�̨� ��D��$m3"��B��iJ�l���z!K�ƀ���W��4���`V \�ہ?zU��?�;���q�؀�i5�w�288�S~lNpU��Ɋ7�NP`ɿi�쎆���43�p�b��f=LƩ�O��&/�҇�� it[ startxref A metre wire bridge or a digital ohm meter, a platinum resistance thermometer, a standard resistor and cell (if using the metre bridge), a Bunsen tripod and gauze, a beaker, water. secondary thermometers, such as the platinum resistance thermometer, whose reproducibility can be better by a factor of ten than that of any primary thermometer. �S,�!�w&6�]��K �2��*�-I>�S�0� �a=��E�f�3�@S��4��^2�dX�� <>>> The platinum resistance thermometer has a long and honorable history. View chapter Purchase book For showing the principles of platinum resistance thermometry and for accurate temperature measurement using a bridge method such as 'Cary-Foster' bridge. Thermometer ( PRT ) is derived from the CVD equation some 500 turns and … technique. 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