BS 1365:1990

Foreword
Committees responsible
Specification
1. Scope
2. Type and designation
3. Temperature scale
4. Bulb
5. Stem
6. Annealing
7. Stabilization
8. Graduation and figuring
9. Immersion line
10. Expansion volume
11. Finish
12. Enlargements of the bore
13. Dimensions of scale ranges
14. Marking
Appendices
A. Emergent liquid column temperatures for partial
     immersion thermometers
B. Testing of thermometers
C. Thermometric glasses approved by the National
     Physical Laboratory
D. Stabilization test
Tables
1. Graduation, figuring and general dimensions
2. Scale ranges and tolerances
3. Recommended limits of uncertainty of test
4. Identification strip(s) or approved abbreviations
     and normal maximum working temperature of all
     glasses that have been approved for the
     manufacture of thermometer bulbs
Figure
1. Examples of scale lines and figuring

Two series of mercury-in-glass thermometers for either total immersion or partial immersion. Series A comprises 7 thermometers, scale range approximately 60°C, scale interval 0.5°C covering range -10°C to +360°C. Series B comprises 24 thermometers, scale range approximately 10°C, scale interval 0.1°C covering range -10°C to +220°C.

This British Standard specifies requirements for two series, A and B, of mercury-in-glass thermometers. In each series, thermometers calibrated for total immersion, i.e. immersion to the reading (designated A1 or B1) and thermometers calibrated for partial immersion (designated A2 or B2) are included for each temperature range.

Series A1 comprises seven total immersion thermometers, each with a scale span of approximately 60 Celsius degrees, covering the range − 10 °C to + 360 °C.

Series A2 covers the same range for an immersion of 80 mm.

Series B1 comprises 24 total immersion thermometers, each with a scale span of approximately 10 Celsius degrees, covering the range − 10 °C to + 220 °C.

Series B2 covers the same range for an immersion of 70 mm.

NOTE The title of the publication referred to in this standard is listed on the inside back cover.