BS 4161-1:1967

Cooperating organizations
Foreword
Specification
1. General
1.1 Scope
1.2 Definitions
1.3 Ratings
2. Credit Meters
2.1 Materials
2.2 Design and dimensions
2.3 Assembly and workmanship
2.4 Connections
2.5 Performance
2.6 External leakage
2.7 Internal leakage
2.8 Finish
2.9 Transit cap
2.10 Marking
3. Prepayment meters
3.1 General requirements
3.2 Design and dimensions
3.3 Performance
3.4 Finish
3.5 Marking
Appendices
A. Method of ordering
B. Test requirements for synthetic diaphragms
C. Schedule of requirements for the pressure test
     nipple for fitting on meters
D. Accuracy test for registration
E. Tests for pressure loss and pressure oscillation
F. External leakage test
G. Paint scratch test
H. Paint resistance to humidity test
J. Accuracy test for prepaid volume
K. Warning period test for prepayment valves
L. Requirements for the inclined pressure gauge
M. Conversion factors
N. Notes on case sizes
Tables
1. Case thickness
2. Sealing gland packing length
3. Internal leakage test rates
4. Coinplate range
5. Coinplate setting
6. Coinplate identity colours
7. BS case reference numbers and dimensions
Figures
1. Meter dimensions
2. Pressure test point position
3. Pressure test nippled
4. Meter index, dial type, below 700 ft cubed/h badged
     rating
5. Meter index, dial type, 700 to 1000 ft cubed/h
     badged rating
6. Meter index, direct reading with test dial, below
     700 ft cubed/h badged rating
7. Meter index, direct reading with test dial, 700
     to 1000 ft cubed/h badged rating
8. Escape badge
9. Property badge
10. Maker's badge
11. Prepayment meter
12. Hasp of prepayment meter
13. Internal lock for prepayment meter
14. Bubble leak indicator
15. Paint scratch test apparatus
16. Prepaid volume accuracy test apparatus
17. Inclined pressure gauge