0000012013 00000 n 0000003834 00000 n 0000030604 00000 n 0000005120 00000 n 0000096795 00000 n 0000018298 00000 n 0000002061 00000 n �:N_��&�q�S��&;$:UZO�P;Q��V��D������T8�R�c�B�ٗ��-�ۖ�^�;�ڿKE��g���Ш? 0000005834 00000 n 0000031052 00000 n Figure 3: This simplified RTD signal conditioning circuit uses the RTD in series with a known reference resistor (R REF) and a current source; the voltage across the RTD is measured along with the voltage across the reference resistor to calculate the RTD … 0000016653 00000 n If we want to measure temperature with high accuracy, an RTD is the ideal … 0000006383 00000 n trailer << /Size 470 /Info 392 0 R /Encrypt 407 0 R /Root 406 0 R /Prev 247936 /ID[<18cf094cbfd7a1e1544aa2437a7dec22><14f00e06d16b556af11d3e3ca922e598>] >> startxref 0 %%EOF 406 0 obj << /Type /Catalog /Pages 393 0 R /Metadata 404 0 R /Threads 408 0 R /Names 411 0 R /JT 403 0 R /PageLabels 391 0 R >> endobj 407 0 obj << /Filter /Standard /R 2 /O (ZM#�p'�a_� U�5L^�ӛ_����oV�s) /U (`��i�fp&[�$��q^D�-�mч�xd�2��) /P -12 /V 1 /Length 40 >> endobj 408 0 obj [ 409 0 R 410 0 R ] endobj 409 0 obj << /I << /Title (�)>> /F 415 0 R >> endobj 410 0 obj << /I << /Title (�Z��+����)>> /F 23 0 R >> endobj 411 0 obj << /Dests 389 0 R >> endobj 468 0 obj << /S 78 /T 214 /E 265 /L 281 /Filter /FlateDecode /Length 469 0 R >> stream The proper design of the signal-conditioning module is critical for maximizing the accuracy of the DAQ system. Note that this circuit was designed for a -50℃ to 150℃ RTD temperature range. When the RTD's cable resistance is significant (greater than a few mΩ for a PT100), a 3-wire or 4-wire RTD will generally be used. 0000017125 00000 n 0000003056 00000 n Signal Conditioning Tutorial Tutorial 459 RTDs Another popular temperature-sensing device is the resistance-temperature detector (RTD), a device whose resistance increases with temperature. 0000010725 00000 n The most popular type of RTD is made of platinum and has a nominal resistance of 100 Ωat 0 ˚C. A Resistance Temperature Detector (also known as a Resistance Thermometer or RTD) is an electronic device used to determine the temperature by measuring the resistance of an electrical wire. 0000017938 00000 n 0000008406 00000 n Simplified RTD signal-conditioning circuit. 2.BRIDGE OUTPUT 0000003344 00000 n 0000071151 00000 n 0000011787 00000 n 0000004909 00000 n The ADR225 is a precision 2.5 V band gap voltage reference specified for a high temperature operation of 175°C and 210°C 0000015821 00000 n RTD SIGNAL-CONDITIONING PATH Changes in resistance of the RTD element over temperature are usually digitized through an A/D conversion, as shown in Figure 5. 0000002514 00000 n 0000011439 00000 n 0000081141 00000 n At -50℃ the RTD resistance is 80.3Ω and the voltage across it is 8.03mV (VRTD = (100µA)(80.3Ω), see Figure 2). 0000002167 00000 n 0000015773 00000 n 0000003455 00000 n 0 ��X endstream endobj 469 0 obj 242 endobj 412 0 obj << /Type /Page /Parent 393 0 R /Resources 421 0 R 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Grab the Signal Conditioner body, at the points marked d‚ and pull it towards C, until the two side lugs e are out of their housing and the internal circuits are visible. 0000003338 00000 n If you excite the bridge with 200 mV (to provide 1 mA at 0 degrees), the differential output at 70 degrees will be about 112 mV and the current in … <<3DF0CFFBDFAC554EB2D5BB6996670115>]>> 0000018074 00000 n 0000030104 00000 n @�\� �w�V���;)�X��:3����$N�&�a���ev�$:��S�1�\�K�u��RY�����1�B�ɩ���d�MI�4�2i\�6�W�1>"�З+��`��p�H6�/���d� k�w���8-���`Ò.$�D��v�/D�?LI��Ȗ�| Although it also measures temperature, an RTD (resistance temperature detector) is a very different kind of temperature sensor compared with the thermocouple. 4. 0000003245 00000 n 0000004058 00000 n This wire is referred to as a temperature sensor. Detector ( RTD ) signal conditioning, the first step is to determine input signal itself shown in Figure )! 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