AS 1031-1973

3 - AS 1031-1973 METAL-CASED MERCURY-IN-GLASS THERMOMETERS FOR USE IN THE DAIRYING INDUSTRY - METRIC UNITS
4 - PREFACE
5 - 1 SCOPE.
5 - 2 TEMPERATURE SCALE.
5 - 2.1 Range.
5 - 2.2 Graduation Interval.
5 - 3 MATERIALS.
5 - 3.1 Glass.
5 - 3.1.1 Basic requirements
5 - 3.1.2 Glass for the bulb
6 - 3.2 Metal.
6 - 3.2.1 For the case, scale plate and fittings
6 - 3.2.2 For the tail piece
6 - 4 CONSTRUCTION.
6 - 4.1 Thermometer Tube.
6 - 4.1.1 Shape
6 - 4.1.2 Capillary tube
6 - 4.1.3 Gas filling
6 - 4.1.4 Expansion or safety chamber
6 - 4.1.5 Enlargement of bore
6 - 4.1.6 Anchoring
6 - 4.2 Metal Case.
6 - 4.3 Tail Piece.
7 - 4.4 Scale Plate.
7 - 4.5 Loose Union Fitting.
7 - 5 GRADUATION AND FIGURING.
7 - 5.1 On the Thermometer Tube.
7 - 5.1.1 Length of scale
7 - 5.1.2 Style of graduation
7 - 5.1.3 Length of graduation lines
7 - 5.1.4 Quality and positioning of lines
8 - 5.2 On the Metal Scale Plate.
8 - 5.2.1 Frequency of lines and numerals
8 - 5.2.2 Positioning of lines and numerals
8 - 6 ACCURACY.
8 - 6.1 Scale Error.
8 - 6.2 Repeatability of Reading.
8 - 7 RESPONSE TIME.
8 - 8 MARKING.
11 - APPENDIX A - GLASSES FOR THE BULBS OF THERMOMETERS
13 - APPENDIX B - METHOD FOR THE DETERMINATION OF SCALE ERROR
13 - B1 APPARATUS.
13 - B2 PROCEDURE.
13 - B2.1 Range A Thermometers.
13 - B2.2 Range B Thermometers.
14 - APPENDIX C - METHOD FOR ASSESSING THE REPEATABILITY OF TEMPERATURE READINGS
14 - C1 APPARATUS.
14 - C2 PROCEDURE.
14 - C2.1 Range A Thermometers.
14 - C2.2 Range B Thermometers.

Specifies thermometers, either straight or 90 and, in two temperature ranges viz. -5 to +50 degrees Celsius and -10 to +110 degrees Celsius. Requirements relate to materials, construction, graduation and figuring both on the thermometer tubes and the metal scale plates, accuracy, response time and marking. Appendices list approved thermometric glasses, and describe methods for determining scale error and repeatability of temperature readings.

This specification applies to metal-cased mercury-in-glass thermometers of the solid stem type intended primarily for use in the dairying industry but suitable also for use in other food processing industries. The thermometers are provided with loose-unions that facilitate installation in thermometer pockets on tanks or pipelines.NOTE: Typical straight and 90 degrees bend thermometers are illustrated in Fig. 1.

Reconfirmed 1993