ASTM D8164 - 18a

    Standard Guide for Digital Contact Thermometers for Petroleum Products, Liquid Fuels, and Lubricant Testing

    Active Standard ASTM D8164 | Developed by Subcommittee: D02.91

    Book of Standards Volume: 05.05

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    Significance and Use

    5.1 The DCT criteria listed in Table 1 have been found to be suitable for replacing some of the noted liquid-in-glass thermometers with a DCT. The criteria stated are based on the liquid-in-glass (LiG) thermometer design 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 D7962.

    (A) Indicates placement of the sensor which is typically in the sample or the container (bath) holding the sample.
    (B) A device’s minimum and maximum temperature may be different than the values shown provided the calibration requirements are met.
    (C) Accuracy is the combined accuracy of the DCT unit that is the display and sensor without correction factors. See Guide E2877 for more information regarding selecting a DCT.
    (D) Sensor sheath is the tube that holds the sensing element. The value is the nominal outside diameter of the sheath segment containing the sensing element.
    (E) Supporting data have been filed at ASTM international headquarters and may be obtained by requesting research report RR:D02-1849.
    (F) The physical length of the temperature sensing element. Contact the DCT supplier to determine whether this parameter is met, as it will not be accessible to the user.
    (G) Minimum probe immersion depth needed for an accurate measurement as determined by Practice D7962 and is to be equal to or less than the value in the table.
    (H) As determined by Practice D7962 or an equivalent procedure.
    (I) Minimum number of calibration data points used to establish calibration, subsection 6.4.

    5.2 When replacing a LiG thermometer with one of the D02-DCTs listed in Table 1 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. Scope

    1.1 This guide establishes criteria for the various parameters 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.

    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.

    ASTM Standards

    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

    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

    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

    ISO Standard

    ISO 17025

    ICS Code

    ICS Number Code 17.200.20 (Temperature-measuring instruments)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D8164-18A

    Citation Format

    ASTM D8164-18a, Standard Guide for Digital Contact Thermometers for Petroleum Products, Liquid Fuels, and Lubricant Testing, ASTM International, West Conshohocken, PA, 2018,

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