BS 7234-1:1990

Foreword
Committees responsible
Specification
1. Scope
2. Definitions
3. Technical characteristics
3.1 Design
3.2 Meter size and dimensions
3.3 Working parameters
3.4 Indicating device
3.5 Supplementary indicating devices
3.6 Materials and construction
3.7 Heat meter power supplies and the use of batteries
3.8 Electrical performance and safety requirements
3.9 Strainers
3.10 Protection against fraud
3.11 Marking
3.12 Storage conditions
4. Metrological characteristics
4.1 Metrological classes
4.2 Maximum permissible errors
5. Pressure loss
6. Compliance criteria and testing
6.1 Compliance criteria
6.2 Principles for the measurement error testing of
     combined heat meters
6.3 Principles for the measurement error testing of
     complete heat meters
7. Pattern approval
7.1 Procedure
7.2 Pattern approval tests
7.3 Certificate of pattern approval
8. Initial verification
8.1 Procedure
8.2 Initial verification tests
Tables
1. Table of threaded end connections: range of sizes
     and thread lengths
2. Table of maximum permissible errors +/- E of heat
     meters
3. Table of mains borne transient types
Figures
1. Length of threaded connection and clearance length
2. Waveshape of a single type 1 transient
3. General graph of a type 1 and type 2 fast transient

Establishes definitions, and specifies electrical and mechanical compatibility, accuracy, testing, pattern approval, and initial verification requirements for heat meters for charging for heat supplied (normally in the form of hot water) to domestic or small commercial premises from centralised heat and power systems for district heating purposes.