Pressure Gauges and Pressure Transmitters:

⚙️ Pressure Gauge

Overview

• A pressure gauge is a mechanical device that provides a direct, local indication of pressure in a system.
• It typically uses a Bourdon tube, diaphragm, or capsule mechanism to convert pressure into needle movement on a dial.
• In HMS test wells, gauges are typically mounted for local operators to quickly check pressure, while transmitters are integrated into the control room software for continuous monitoring, logging, and safety automation.
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Key Features

• Analog display (dial with pointer).
• Range: Commonly from vacuum up to 20,000 psi (special gauges can go higher).
• Accuracy: ±0.5% to ±2% of full scale.
• Construction: Stainless steel case, safety glass dial, and pressure connection (NPT, BSP, or flanged).
• Operation: No external power required.

Applications

• Local monitoring of hydraulic systems.
• Oil & gas wellheads and test wells.
• Compressors, pumps, and pipelines.
• Safety monitoring in boilers and pressure vessels.

📡 Pressure Transmitter

Overview

• A pressure transmitter is an electronic device that converts pressure into a standard electrical signal (e.g., 4–20 mA, HART, or digital protocols).
• It allows remote monitoring, control, and automation.

Key Features

• Sensing element: Strain gauge, piezoelectric, or capacitive sensor.
• Output signal: Analog (4–20 mA) or digital (Modbus, HART, Profibus).
• Accuracy: ±0.1% to ±0.25% of full scale (higher than gauges).
• Range: From vacuum up to 100,000 psi depending on design.
• Construction: Stainless steel housing, explosion-proof or intrinsically safe options for hazardous areas.
• Requires power supply (typically 24 VDC).

Applications

• Integration with SCADA/DCS systems for oil & gas fields.
• Automated test wells and booster systems.
• Pipeline monitoring and leak detection.
• Aerospace and industrial process control.