Differential Pressure Gauge (MMWC Type) Inquiry

A Differential Pressure Gauge (mmWC type) is an essential instrumentation device used for precise monitoring of pressure differences across filters, strainers, orifices, heat exchangers, and pipelines in boilers, heaters, and process piping systems. It measures the pressure drop between two points, typically expressed in millimeters of water column (mmWC), ensuring safe, efficient, and reliable operation of process equipment.

In boiler and heater systems, the gauge provides critical insights into flow resistance, filter choking, or fouling of heat exchangers, enabling preventive maintenance and avoiding unplanned downtime. With its robust design, corrosion-resistant materials, and accurate sensing mechanism, the differential pressure gauge delivers dependable readings even under demanding industrial conditions.

This instrument is widely adopted in steam boilers, hot water generators, thermic fluid heaters, and chemical/petrochemical process pipelines, ensuring operational safety, energy efficiency, and extended equipment life.

⚙️ Technical Highlights

  • Measuring Principle: Direct mechanical sensing of pressure difference between high-pressure and low-pressure connections.
  • Range: Typically available from 0–50 mmWC up to 0–5000 mmWC (custom ranges as per application).
  • Units: Calibrated in mmWC (millimeters of water column), optionally in Pa or mbar.
  • Accuracy: ±1.6% to ±1% of Full Scale (FS), depending on model and design.
  • Dial Size: Standard 100 mm / 150 mm dial for clear visibility.
  • Case & Wetted Parts: Stainless Steel (SS 304 / SS 316) for high corrosion resistance in steam and process media.
  • Process Connection: 1/4” or 1/2” BSP/NPT (female or male) with two pressure ports (High & Low).
  • Working Pressure & Temperature: Designed for low differential ranges with static pressures up to 10 bar and temperature withstand up to 120°C (with remote capillary or cooling element for higher).
  • Applications:
    • Monitoring filter clogging in boiler feedwater and process lines.
    • Measuring pressure drop across heat exchangers, strainers, and scrubbers.
    • Ensuring correct flow measurement with orifice plates and venturi tubes.
    • Used in combustion air & flue gas monitoring in boilers and heaters.
  • Special Features:
    • Vibration-resistant movement for long service life.
    • Option of liquid-filled case for pulsating conditions.
    • Compact design for easy panel or field mounting.
    • Safety blow-out disc for operator protection.