ASTM S20F Non-Mercury Thermometer, 134 to 148F, NIST

ASTM S20F Non-Mercury Thermometer, 134 to 148F, NIST

For precise and safe temperature measurement, the ASTM S20F Non-Mercury Thermometer offers a reliable solution, calibrated to NIST standards for temperatures ranging from 134 to 148°F. This instrument is engineered to mirror the exact physical and performance characteristics of traditional ASTM thermometers for their specified applications, providing equivalent accuracy and dependability without the environmental or safety concerns associated with mercury.

At its core, this liquid-in-glass thermometer utilizes a specially formulated blue indicating liquid. This advanced fluid is not only biodegradable, non-toxic, and non-hazardous, making it a safer choice for both laboratory personnel and the environment, but its dark blue hue ensures exceptional readability against the white-backed stem, reducing the potential for reading errors.

Each thermometer is supplied with a NIST Traceable Certificate of Calibration, guaranteeing the highest level of metrological integrity. This certificate confirms a rigorous five-point calibration conducted in an ISO/IEC 17025 accredited laboratory. The accreditation signifies that the calibration process adheres to stringent international standards, performed in a controlled environment by qualified experts. During calibration, the thermometer undergoes direct comparison against highly stable Precision Reference Thermometers (PRTs) and Standard Platinum Resistance Thermometers (SPRTs) within a high-stability liquid bath. Before testing, each unit is meticulously inspected for any physical defects like cracks or liquid-column separations to ensure optimal performance. This thorough process provides a verified calibration across five distinct temperature points, critical for applications demanding consistent accuracy and regulatory compliance.

Key Specifications:

• ASTM Number: S20F
• Temperature Range: 134 to 148°F (equivalent to 56 to 64°C)
• Immersion: Total (designed for full submersion of the liquid column for accurate readings)
• Application: Ideal for Saybolt Viscosity measurements, ensuring compliance with relevant industry standards.
• Division: 0.2 degrees, offering fine-grained temperature resolution.
• Type: Non-Mercury, providing an environmentally conscious and safe alternative.
• Length: 11 inches (280mm), suitable for various laboratory setups.

Care and Maintenance: To preserve the integrity and accuracy of your Non-Mercury Thermometer, always store it vertically in a dedicated storage rack. This practice is crucial in preventing fluid column separation, which can compromise the thermometer's functionality. For applications in ovens or other exposed and potentially harsh environments, consider using a Thermometer Well. A well offers robust physical protection for the glass bulb and aids in thermal stabilization, ensuring more consistent and accurate readings while extending the thermometer's lifespan.