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Significance and Use
5.1 The examples of DCT criteria noted in this guide are approximately those found to be suitable for replacing some of the noted liquid-in-glass thermometers with a DCT. The criteria are based on the liquid-in-glass (LiG) thermometer design components, which are the bulb length, immersion depth, precision of measurement, thermometer position, and so forth. The parameters for sensor length, immersion depth, sheath diameter are especially critical when measuring the temperature of small static samples due to temperature probe thermal conductivity. A DCT that is suitable for use in a stirred constant temperature bath will likely result in measurement errors when used to measure small sample temperature. These can be a degree or more when the sample temperature differs from room temperature by 40 °C or more using a 7 mm probe. This error is due to the difference in thermal conductivity of a DCT and LiG thermometer. The most effective way to counter this is by reducing DCT sheath diameter, insulating the sheath above the immersion level, and using a probe that has a small immersion depth as determined by Practice . For more guidance on selecting an appropriate DCT, see Guide .
5.2 When replacing a LiG thermometer with a DCT noted in this guide and the test method does not list any DCT criteria, it is incumbent on the user to verify the suitability of the DCT they have selected. This can be done by comparing measurements made with the selected DCT to those of a LiG thermometer and following the test procedure. Comparative measurements are especially important when measuring the temperature of a small static sample where there is a large difference between sample and room temperature. Covering the DCT probe sheath except for the sensing portion with a glass, plastic, or tubing with a lower thermoconductivity can improve the agreement between LiG and DCT measurements.
1.1 This guide provides examples of criteria needed to define a digital contact thermometer (DCT) suitable for measuring temperature in the test methods utilized by Committee D02. The DCT criteria are based on the design and sensing characteristics of the liquid-in-glass thermometers that have been used successfully in Committee D02 test methods. The DCT criteria listed in a test method take precedence over those listed in this guide.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ISO StandardISO 17025
D97 Test Method for Pour Point of Petroleum Products
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D2162 Practice for Basic Calibration of Master Viscometers and Viscosity Oil Standards
D2386 Test Method for Freezing Point of Aviation Fuels
D2500 Test Method for Cloud Point of Petroleum Products and Liquid Fuels
D2532 Test Method for Viscosity and Viscosity Change After Standing at Low Temperature of Aircraft Turbine Lubricants
D2983 Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer
D3829 Test Method for Predicting the Borderline Pumping Temperature of Engine Oil
D4539 Test Method for Filterability of Diesel Fuels by Low-Temperature Flow Test (LTFT)
D4684 Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature
D5481 Test Method for Measuring Apparent Viscosity at High-Temperature and High-Shear Rate by Multicell Capillary Viscometer
D5853 Test Method for Pour Point of Crude Oils
D6371 Test Method for Cold Filter Plugging Point of Diesel and Heating Fuels
D6821 Test Method for Low Temperature Viscosity of Drive Line Lubricants in a Constant Shear Stress Viscometer
D6896 Test Method for Determination of Yield Stress and Apparent Viscosity of Used Engine Oils at Low Temperature
D7279 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids by Automated Houillon Viscometer
D7962 Practice for Determination of Minimum Immersion Depth and Assessment of Temperature Sensor Measurement Drift
D8210 Test Method for Automatic Determination of Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants Using a Rotational Viscometer
E1 Specification for ASTM Liquid-in-Glass Thermometers
E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature
E644 Test Methods for Testing Industrial Resistance Thermometers
E1750 Guide for Use of Water Triple Point Cells
E2251 Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids
E2877 Guide for Digital Contact Thermometers
ICS Number Code 17.200.20 (Temperature-measuring instruments)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D8164-19, Standard Guide for Digital Contact Thermometers for Petroleum Products, Liquid Fuels, and Lubricant Testing, ASTM International, West Conshohocken, PA, 2019, www.astm.orgBack to Top