scope:

GENERAL

This Defence List applies to Pressure Gauges (Gauges, pressure, dial indicating), Vacuum Gauges (Gauges, vacuum, dial indicating) and Combined Pressure and Vacuum Gauges, (Gauges, compound, pressure-vacuum, dial indicating), of the following types:

Industrial gauges with concentric scales.

Test gauges with concentric scales.

This Defence List does not include gauges for installation in aircraft, which are covered by separate aircraft Standards, or gauges for vehicles.

The List is a co-ordinated range of Pressure Gauges for use by the Services and Government departments and is divided into parts as follows:-

Table 1. Showing pressure gauges of the Bourdon tube type conforming to B.S. 1780 and which are used by one or more of the Services and Government departments.

Table II. Showing pressure gauges of the Bourdon tube type which are covered by B.S. 1780 except for the deviations indicated. They are essential for Service and Government department users, and are used by one or more of the Services and Government departments.

Users should refer to B.S. 1780, which contains recommendations regarding the installation and use of Pressure Gauges.

The use of General Purpose Gauges need not be confined to the pressure medium, air, oil, steam, or water, shown in Duty Columns of Tables I and II, provided the material used for the gauge components is suitable for the pressure medium.

The term" Corrosive" in the " Duty" column of Tables I and II is used in its generic sense and it must not be assumed that a gauge suitable for one corrosive is equally suitable for another. The gauges shown are dimensionally and functionally interchangeable but suitable materials must be specified for each corrosive pressure medium.

For gauges with dual pressure scales, the predominant scale appears first in the Tables, e.g. 0-70 ft hd-lb/in2 is where 0-70 ft hd is required to be the predominant scale.