BS 5248:1990

Foreword
Committees responsible
Specification
Section one. General
1. Scope
Section two. Thermometers
2. Types
3. Range
4. Temperature scale
5. Material
6. Annealing
7. Stabilization
8. Construction
9. Graduation and figuring
10. Accuracy
11. Marking
Section three. Frame
12. General
13. Radiation shields
14. Aspiration motor
15. Thermometer locating holes
16. Ventilation rate
17. Carrying case and accessories
18. Marking of carrying case and frame
Appendices
A. Method of use of aspirated hygrometer
B. Tables suitable for use with aspirated hygrometers
C. Errors in computed relative humidity due to
    thermometer errors
D. Thermometric glasses approved by the National
    Physical Laboratory
E. Testing of thermometers
Tables
1. Dimensions for thermometer
2. Maximum error in computed relative humidity due
    to thermometer error
3. Indication strip(s) or approved abbreviations and
    normal maximum working temperature of all glasses
    that have been approved for the manufacture of
    thermometer bulbs

Celsius scale solid-stem, mercury-in-glass thermometers for electrically or clockwork driven aspirated hygrometers more accurate than the whirling hygrometers described in BS 2842. Essential details of remainder of instrument. Guidance on methods of use and errors in computed humidity.

This British Standard specifies requirements for mercury-in-glass thermometers suitable for use in an electrically or mechanically aspirated wet and dry bulb hygrometer together with the essential construction and performance requirements for the frame.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.