AS 1349-1986 pdf free.Bourdon tube pressure and vacuum gauges.
AS 1349 specifies requirements for Bourdon tube pressure and vacuum gauges with circular concentric scales within the pressure range – 100 kPa to + 100 000 kPa. and the nominal size range (approximate dial diameter) 50 mm to 300 mm. Compound gauges (pressure and vacuum) are also included.
The gauges are graded according to accuracy. two grades being specified, viz test gauges and industrial gauges. The gauges are generally suitable for use with fluids such as air, oil, water or steam, but special provision is made for gauges which are intended for high pressure applications, or for use with oxygen or acetylene, or with other reactive gases.
1.3 DEFINITIONS.
1.3.1 Gauge types.
1.3.1.1 Pressure gauge-an instrument giving a visual indication, by means of a pointer relative to a scale, of the amount by which the pressure of a fluid applied to it exceeds the pressure of the surrounding atmosphere.
1.3.1.2 Vacuum gauge-an instrument giving a visual indication by means of a pointer relative to a scale, of the amount by which the pressure of a fluid applied to it is less than the pressure of the surrounding atmosphere.
1.3.1.3 Compound pressure gauge—an instrument giving a visual indication by means of a single pointer relative to a scale, of the amount by which the pressure of a fluid applied to ii exceeds, or is less than, the pressure of the surrounding atmosphere. The scale is continuously graduated with zero at atmospheric pressure.
1.3.1.4 Duplex gauge-a gauge having two independent Bourdon tubes and two independent pressure connections, and a means to measure and indicate two independent pressures.AS 1349 pdf download.