AS 2831-1985

1 - AS 2831-1985 THERMOMETERS-SOLID STEM-LONG AND SHORT-FOR PRECISION USE
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE.
6 - 2 REFERENCED DOCUMENTS.
6 - 3 DEFINITIONS.
6 - 3.1 Complete immersion
6 - 3.2 Permanent marki ngs
6 - 3.3 Secular change
6 - 3.4 Stiction
6 - 3.5 Thermometer
6 - 3.6 Total immersion
6 - 4 THERMOMETER TYPE.
6 - 5 SCALE AND DESIGNATION.
6 - 5.1 General.
6 - 5.2 Auxiliary scale.
7 - 5.3 Designation.
7 - 6 GRADUATION FOR IMMERSION.
7 - 7 MATERIALS.
7 - 7.1 Glass.
7 - 7.1.1 General
7 - 7.1.2 Glass for the bulb
7 - 7.2 Liquid filling.
7 - 7.2.1 General
7 - 7.2.2 Thermometers designated AS 2831/0.2/-55/+5 and AS 2831/0.5/-55/+2
7 - 7.3 Gas filling.
7 - 8 CONSTRUCTION.
7 - 8.1 Shape.
7 - 8.2 Dimensions.
9 - 8.3 Finish at top.
9 - 8.4 Capi llary tube.
9 - 8.5 Expansion chamber.
9 - 8.6 Contraction chamber.
9 - 9 GRADUATION AND FIGURING.
9 - 9.1 General.
9 - 9.2 Range and graduation interval.
10 - 9.3 Extension of range.
10 - 9.4 Style of graduation.
10 - 9.5 Graduation lines.
10 - 9.5.1 Construction
10 - 9.5.2 Position
10 - 9.5.3 Length
10 - 9.5.4 Thickness
10 - 9.5.5 Spacing
10 - 9.6 Figuring
10 - 10 ACCURACY.
10 - 10.1 General.
10 - 10.2 Scale error.
10 - 10.3 Interval error.
10 - 10.4 Change in zero.
11 - 11 MARKING.
11 - 12. ACCOMPANYING LITERATURE.
12 - APPENDIX A - METHOD FOR DETECTING STRAIN IN A GLASS THERMOMETER USING A SIMPLE POLARISCOPE
12 - A1 SCOPE.
12 - A2 APPARATUS.
12 - A2.1 Polariscope.
12 - A2.2 Polarizing sunglasses.
12 - A3 PROCEDURE.
12 - A4 GUIDELINES FOR ASSESSING THE PRESENCE OF STRAIN.
12 - A5 REPORT.
14 - APPENDIX B - GLASSES FOR THE BULBS OF SOLID-STEM THERMOMETERS
15 - APPENDIX C - METHOD FOR ASSESSING THE PERMANENCE OF PIGMENTED FILLERS USED TO HIGHLIGHT MARKINGS ON SOLID STEM THERMOMETERS
15 - C1 SCOPE.
15 - C2 PRINCIPLE.
15 - C3 REAGENTS.
15 - C3.1 Introduction.
16 - C3.2 Test liquids.
16 - C4 APPARATUS.
16 - C4.1 Constant temperature environment.
16 - C4.2 Test bath(s)/container(s).
17 - C4.3 Test thermometers.
17 - C5 TEST PLAN.
17 - C5.1 Preliminary considerations.
17 - C5.2 Choice of plans.
17 - C6 PROCEDURE.
19 - APPENDIX D - METHOD FOR DETERMINING CHANGE IN ZERO
19 - D1 SCOPE.
19 - D2 PROCEDURE.
19 - D3 REPORT.
19 - APPENDIX E - DETERMINATION OF COMPLIANCE OF A LOT
19 - E1 AUSTRALIAN STANDARDS MARK.
19 - E2 ASSESSMENT OF COMPLIANCE ON THE BASIS OF STATISTICAL SAMPLING
19 - E3 ASSURANCE OF COMPLIANCE ON THE BASIS OF SUPPLIERS’ QUALITY CONTROL SYSTEMS

Specifies requirements for long and short solid stem thermometers intended for general use over the ranges from -55 degrees Celsius to 420 degrees Celsius for long thermometers and from -55 degrees Celsius to 410 degrees Celsius for short thermometers. Details the coding which designates the graduation interval and the practical temperature range over which the thermometer is useful. Includes procedures for detecting strain in the glass, determining the change in zero and assessing the resistance of pigment fillers to chemical agents.

This standard specifies requirements for long solid-stem thermometers not exceeding 375 mm in length, and short solid-stem thermometers not exceeding 250 mm in length, intended for general use in precision temperature measurement. Nominal temperature ranges covered by these thermometers are from 55C to 420C for long thermometers and from 55C to 410C for short thermometers.