1 Scope
This regulation is applicable to the initial verification, subsequent verification, in-service inspection, type approval and prototype test of heat meters.
Verification of heat meters used to measure the absorbed heat quantity may refer to this regulation.
1 Scope
2 References
3 Terms and Definitions
3.1 Heat Meter
3.2 Sub-assemblies of A Heat Meter
3.3 Ruted Operating Conditions
3.4 Total Verification
3.5 Component Verification
4 General
4.1 Working Principle
4.2 Structure
4.3 Calculation Formulas of Heat Energy
5 Metrological Performance Requirements
5.1 Airtightness and Strength of Flow-rate Sensor
5.2 Accuracy Grade of Heat Meter
5.3 Error Limit of Heat Meter
5.4 Repeatability Er of Non-impeller Flow-rate Sensor
5.5 Lower Temperature Limit of Heat Meter
5.6 Maximum Pressure Drop of Flow-rate Sensor
6 General Technical Requirements
7 Control of Measuring Instruments
7.1 Verification Conditions
7.2 Verification Items
7.3 Verification Methods
7.4 Treatment of Verification Result
7.5 Verification Cycle
Appendix A Type Approval and Prototype Test
Appendix B Enthalpy Value and Density of Water
Appendix C Thermal Coefficient Table
1 Scope
This regulation is applicable to the initial verification, subsequent verification, in-service inspection, type approval and prototype test of heat meters.
Verification of heat meters used to measure the absorbed heat quantity may refer to this regulation.
Contents of JJG 225-2001
1 Scope
2 References
3 Terms and Definitions
3.1 Heat Meter
3.2 Sub-assemblies of A Heat Meter
3.3 Ruted Operating Conditions
3.4 Total Verification
3.5 Component Verification
4 General
4.1 Working Principle
4.2 Structure
4.3 Calculation Formulas of Heat Energy
5 Metrological Performance Requirements
5.1 Airtightness and Strength of Flow-rate Sensor
5.2 Accuracy Grade of Heat Meter
5.3 Error Limit of Heat Meter
5.4 Repeatability Er of Non-impeller Flow-rate Sensor
5.5 Lower Temperature Limit of Heat Meter
5.6 Maximum Pressure Drop of Flow-rate Sensor
6 General Technical Requirements
7 Control of Measuring Instruments
7.1 Verification Conditions
7.2 Verification Items
7.3 Verification Methods
7.4 Treatment of Verification Result
7.5 Verification Cycle
Appendix A Type Approval and Prototype Test
Appendix B Enthalpy Value and Density of Water
Appendix C Thermal Coefficient Table
