BL618 Standard Platinum Resistance Thermometer (SPRT) SPECIFICATION The Standard Platinum Resistance Thermometer (SPRT) is a kind of device to measure temperature through a change in electrical resistance of the length of wire. SPRT is the stipulated interpolation instrument for realizing the International Temperature Scale of 1990 between the defining fixed points, over the range from 13.8033 K (the triple point of equilibrium-hydrogen, -259.3467°C) to 961.78°C (the freezing point of silver). The transfer function of the SPRT is electrical resistance as a function of temperature; therefore an accurate measurement of resistance, referred to a fixed resistance base, is an essential component of the ■ BL618 Standard platinum resistance thermometer ■ Wooden carrying case OPTIONAL ACCESSORIES AND SERVCIE ■ Upgrade the annual drift sensor to 0.5mK measurement chain. ORDERING MODEL NUMBER ■ Fused quartz sheathed BL618-7: SPRT, -200°C to 661°C, < 1mk drift, Quartz BL618-8: SPRT, -200°C to 661°C, < 3mk drift, Quartz ■ Reference thermometer for very accurate temperature measurements ■ Comparative calibration in tube furnaces and liquid bath Address: 1322, F/3, Bldg 1, 33 Zique Rd, Haidian, Beijing100095, China