BS 7234-3:1990

Foreword
Committees responsible
Method
1. Scope
2. Definitions
3. Requirements common to all tests
3.1 General rules concerning the test installations
      and their locations
3.2 Laboratory ambient conditions
3.3 Test reference conditions
3.4 Test heat-conveying liquid quality
4. Pressure tests
5. Measurement error test
5.1 Introduction
5.2 Principle
5.3 Test equipment
5.4 Method of use and precautions to be taken in using
      a test circuit for measurement error tests
5.5 Method of use and precautions to be taken in using
      a test rig for flow sensors for measurement error
      tests
5.6 Method of use and precautions to be taken in using
      test equipment for the error measurement tests of
      a calculator with temperature probes
5.7 Method of use and precautions to be taken in using
      test equipment for the error measurement tests of
      a calculator with temperature probes (calculator
      and probes deemed separable)
6. Pressure loss tests
7. Accelerated wear tests
7.1 Principle
7.2 Flow sensors with moving parts
7.3 Temperature probes
7.4 Calculators
8. Dry heat test
9. Cold test
10. Tests on the electronic devices of a heat meter
10.1 General
10.2 Tests with static deviations in the supply voltage
10.3 Tests associated with power failures or battery
      replacement
10.4 Tests with short time power reduction in the
      supply voltage
10.5 Tests with mains borne transients
10.6 Tests with transients capacitively coupled into
      the input or output signal cables of a heat meter
10.7 Tests with electrostatic discharge
10.8 Tests with electromagnetic fields
10.9 Tests with induction fields
10.10 Tests for radio frequency interference emissions
10.11 Frequency variation test
11. Electrical safety tests
12. Supplementary tests: hours-run counter
13. Test report
13.1 General rules
13.2 Pattern approval test report
13.3 Initial verification register
Appendices
A. Summary of requirements and permitted tolerances
    in the measurement of physical quantities
    associated with heat meter test methods and test
    equipment
B. Heat meter test circuit for measurement error and
    other tests
C. Heat meter flow sensor test rig for measurement
    error tests
D. Notes to test laboratories on the measurement error
    tests
Tables
1. Table of mains borne transient types
2. Test procedures and test results
3. Test conclusions
Figures
1. Waveshape of a single type 1 transient
2. General graph of a type 1 and type 2 fast transient
3. Heat meter test circuit

Test methods and means to be employed in testing heat meters in accordance with the requirements given in BS 7234:Part 1.