Mercury-in-Glass Thermometers for Precise Temperature Measurements Near 0°C

Osterkamp, T. E.

doi:10.3189/s0022143000014350

Cited by 1 publication

(1 citation statement)

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“…Levendis et al developed a three-color optical pyrometer for temperature testing of tube furnaces, but it requires the furnace to be transparent and is difficult to apply to tube furnaces in dusty environments such as industrial production [15]. Contact temperature measurement methods, such as mercury thermometers and discrete-type sensors, offer advantages over non-contact methods for testing temperatures in tube furnaces, but they also present certain drawbacks [16,17]. Mercury thermometers are presently used at lower temperatures and are not suitable for temperature testing in high-temperature environments [18].…”

Section: Introductionmentioning

confidence: 99%

Printed Thick Film Resistance Temperature Detector for Real-Time Tube Furnace Temperature Monitoring

Hai,

Su,

Zhu

et al. 2024

Sensors

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Accurately acquiring crucial data on tube furnaces and real-time temperature monitoring of different temperature zones is vital for material synthesis technology in production. However, it is difficult to achieve real-time monitoring of the temperature field of tube furnaces with existing technology. Here, we proposed a method to fabricate silver (Ag) resistance temperature detectors (RTDs) based on a blade-coating process directly on the surface of a quartz ring, which enables precise positioning and real-time temperature monitoring of tube furnaces within 100–600 °C range. The Ag RTDs exhibited outstanding electrical properties, featuring a temperature coefficient of resistance (TCR) of 2854 ppm/°C, an accuracy of 1.8% FS (full scale), and a resistance drift rate of 0.05%/h over 6 h at 600 °C. These features ensured accurate and stable temperature measurement at high temperatures. For demonstration purposes, an array comprising four Ag RTDs was installed in a tube furnace. The measured average temperature gradient in the central region of the tube furnace was 5.7 °C/mm. Furthermore, successful real-time monitoring of temperature during the alloy sintering process revealed approximately a 20-fold difference in resistivity for silver-palladium alloys sintered at various positions within the tubular furnace. The proposed strategy offers a promising approach for real-time temperature monitoring of tube furnaces.

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