ASTM S18C Non-Mercury Thermometer, 34 to 42C, NIST

ASTM S18C Non-Mercury Thermometer, 34 to 42C, NIST

The ASTM S18C Non-Mercury Thermometer offers precise temperature measurement from 34°C to 42°C, featuring fine 0.1°C graduations. Specifically designed for total immersion applications, this thermometer meets rigorous ASTM E1, E77, and E2251 requirements, making it ideal for Saybolt viscosity testing and other critical laboratory procedures within its operating range. Its total length of 11 inches (280mm) ensures adequate immersion depth.

This non-mercury alternative provides the same high-performance characteristics as traditional mercury thermometers but utilizes a safe, blue indicating fluid. This proprietary formula is non-toxic, non-hazardous, and biodegradable, offering an environmentally responsible choice without compromising accuracy. The dark blue liquid stands out clearly against the white-backed stem, ensuring easy and reliable readings.

Key Features:

• Precise Measurement: Range of 34°C to 42°C with 0.1°C graduations for accurate results.
• ASTM Compliant: Meets ASTM E1, E77, and E2251 standards for quality and reliability.
• Safe Alternative: Uses a non-hazardous, biodegradable blue fluid, eliminating mercury exposure risks.
• Clear Visibility: Dark blue fluid contrasts sharply with the white-backed stem for effortless reading.
• Total Immersion Design: Engineered for applications requiring full immersion, such as Saybolt viscosity tests.
• Durable Construction: High-quality glass ensures longevity and stability in laboratory environments.

Each thermometer includes a NIST Traceable Certificate of Calibration, guaranteeing its accuracy. This five-point calibration is performed by an ISO/IEC accredited laboratory, assuring that each thermometer is tested against a Precision Reference Thermometer (PRT) and Standard Platinum Resistance Thermometer (SPRT) in a controlled, high-stability liquid bath. Before calibration, each unit undergoes thorough inspection for any defects like cracks or liquid-column separations, ensuring peak performance upon delivery.

To maintain the integrity of the fluid column and prevent separation, always store non-mercury thermometers vertically, ideally using a dedicated storage rack. For enhanced protection and thermal stabilization in ovens or other exposed environments, consider using a Thermometer Well, which safeguards the glass against damage and rapid temperature fluctuations.