Category
Instrumentation & Control
Subcategory
Pressure
Applicable standards
2
Issuing bodies
2
Description
Mechanical pressure gauge — Bourdon, diaphragm or capsule type.
Applicable Standards (2)
ASME — 1 standard
ASME B40.100
Pressure Gauges and Gauge Attachments
Pressure gauges, transmitters, gauge attachments — accuracy classes, dial sizes, connections.
Key requirements (7)
- Pressure gauges — Bourdon and diaphragm types.
- Accuracy grades: 4A (±0.10%), 3A (±0.25%), 2A (±0.5%), 1A (±1%), A (±2/1/2%), B (±3/2/3%), 4 (±5%).
- Standard dial sizes: 1.5, 2, 2.5, 3, 4, 4.5, 6, 8.5, 12, 16 inches.
- Range selection: normal operating pressure should be in middle 50% of scale.
- Pulsation: snubber required for fluctuating service.
- Liquid-filled (glycerin) gauges damp vibration; preferred for reciprocating pump discharge.
- Diaphragm seals (chemical seals) protect gauge from corrosive/viscous media.
EN/CEN — 1 standard
EN 837 (1, 2, 3)
Pressure gauges
Bourdon and diaphragm pressure gauge specification.