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1.1 This specification defines general specifications for heat meters. Heat meters are instruments that measure heat in heat exchange circuits in which energy is absorbed (cooling) or given up (heating) by a flowing liquid.
1.2 For this specification, the necessary elements of a heat meter consist of a sensor to measure flow of the heat-conveying liquid, a pair of temperature sensors that measure the temperature differential across the heat exchange circuit, and a device that receives input from the flow and temperature sensors and calculates energy.
1.3 Electrical safety is not a part of this specification.
1.4 Mechanical safety (including pressure safety) is not a part of this specification.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
1.6 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.
1.7 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.
IEC StandardsIEC 60068: Environmental Testing Part 2.1 Test A: Cold IEC 60068: Environmental Testing Part 2.2 Tests B: Dry Heat IEC 60068: Environmental Testing Part 2-30 Tests Db: Damp Heat, cyclic IEC 60529 Degrees of protection provided by enclosures (IP Code) IEC 60870 Part 5-1 Telecontrol equipment and systems IEC 61000 Part 4-2 IEC 61000 Part 4-4 IEC TR 61000 Electromagnetic compatibilityPart 2: EnvironmentSection 7: Low frequency magnetic fields in various environments
NEMA StandardsNEMA 250 Enclosures for Electrical Equipment (1000 Volts Maximum)
CCT StandardITS-90 International Temperature Scale of 1990
OIML StandardsOIML R 49 Part 2 Water meters intended for the metering of cold potable water and hot water OIML R75-1 Part 1 General requirements
UNSPSC Code 41112229(Heat meter)
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ASTM E3137 / E3137M-18, Standard Specification for Heat Meter Instrumentation, ASTM International, West Conshohocken, PA, 2018, www.astm.orgBack to Top