The ITS-90 is realized in the SPRT Laboratory entirely by fixed points over the range from the Ar TP to the Ag FP. Resistance thermometers may be called RTDs (resistance temperature detectors), PRTs (platinum resistance thermometers), or SPRTs (standard platinum resistance thermometers). These thermometers operate on the principle that electrical resistance changes in pure metal elements, relative to temperature. The resistance coil is sealed in a thin-walled platinum sheath 151 pt=ioou1 R—R B /N ' (1) *M00 " whereR=observedresistanceatthetemperature,t°, R=" " "o°C, ^,00="." PlatinumThermometryat11iffhTemperatures. Platinum Resistance Thermometer. Thermometers failed to perform to the expected stabilities and so the ITS-90 reduced the upper temperature of contact thermometry to … (a) calculate the temperature coefficient of resistance of platinum (b) calculate the boiling point of brine . How it works: The simplest resistance thermometer configuration uses two wires. Troemner was founded over 160 years ago by ORIGINAL CONTRIBUTIONS A platinum resistance thermometer for use at low temperatures By C. R. BARBER, B.Sc., F.Inst.P., National Physical Laboratory, Teddington, Middlesex [Paper received 15 July, 19551 A platinum resistance thermometer of external dimensions 75 x 2.5 mm suitable for use at low temperatures is described. 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. Standard platinum resistance thermometer model CTP5000-T25 Applications Reference thermometer for very accurate temperature measurements in a range of -189 … +660 °C Precision standard platinum resistance thermometer (SPRT) designed to realise the international temperature ^uraZT.'] YOU WILL NEED. Platinum Resistance Thermometers (PRT) Characteristics. In preparation for the ITS-90 many National Laboratories designed Platinum Resistance Thermometers that would work to the Gold Point of 1064°C. Platinum Resistance Thermometer Thermocouple Thermistor Sensor Platinum-wire wound or flat- film resistor Thermoelement, two dissimilar metals/alloys Ceramic (metal oxides) Accuracy (typical values) 0.1 to 1.0°C 0.5 to 5.0°C 0.1 to 1.5°C Long term Stability Excellent Variable, Prone to ageing Good Temperature range-200 to 650°C -200 to1750°C -100 to 300°C A High-Quality Platinum Resistance Thermometer to 661°C (85.57 KB) An Investigation of Long-Term Stability of a Precision Platinum Resistance Thermometer up to 660°C (164.52 KB) Fixed Points for Secondary Level and Industrial Calibration (496.68 KB) Fixed … Ag FP, the interpolation instrument is a platinum resistance thermometer constructed with a strain-free platinum resistance element and meeting certain performance criteria. Platinum Resistance Thermometer (PPRT) Calibration Laboratory provides calibrations based on the International Temperature Scale of 1990 (ITS-90) [1] to government owned facilities, industry and secondary calibration laboratories. A platinum resistance thermometer (PRT) is a thermometer constructed from a high purity platinum element (wire-wound coil or thin film) placed in a tube of metal or glass and sealed with an inert atmosphere and/or mineral insulator. 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 …