SJ Gauge differential pressure gauges for industrial monitoring

Differential Pressure Gauges

A differential pressure gauge is designed to measure the pressure difference between two pressure points within a system. By monitoring the pressure differential, it helps evaluate flow conditions, filter blockage, liquid levels, or equipment operating status. Differential pressure gauges are widely used in filtration systems, pumps, clean rooms, HVAC systems, and industrial process control applications.

Differential Pressure Gauges FAQ

Questions for selecting differential pressure gauges used in filters, pumps, tanks, HVAC, and process monitoring.

What does a differential pressure gauge measure?
A differential pressure gauge measures the pressure difference between two points. It is commonly used to monitor filter blockage, pump performance, liquid level, airflow, clean rooms, HVAC ducts, and industrial process conditions.
Which differential pressure gauge is suitable for low pressure air or HVAC?
For low pressure air, filters, fans, ducts, and building automation systems, compact low differential pressure models such as PRMD or PRMDS are typically considered. Confirm the pressure range, gas compatibility, display size, and installation direction before selection.
When is a high static pressure or overload-safe model needed?
Applications with high line pressure or possible pressure surges should use a model designed for higher working pressure and overload safety, such as PRHD or PRDC. These are more suitable for pump monitoring, filter monitoring, and process control conditions.
Can differential pressure gauges measure liquids?
Some models are designed for gases only, while all-metal or diaphragm-based constructions can support more demanding media. Always confirm media type, temperature, pressure range, and material compatibility before choosing a model.
  • SJ Gauge differential pressure gauge with zero to one kilogram per square centimeter rangeSJ Gauge stainless steel differential pressure gauge
    Model: PRDC

    Differential Pressure Gauge, All-metal Media Chamber

    • Feature a highly corrosion-resistant all-metal construction and measuring cell protected against tampering
    • Used for pump monitoring and control, filter monitoring and level measurement
    • For gaseous and liquid aggressive media that are not highly viscous or crystallizing, also in aggressive environments
  • SJ Gauge low-pressure and differential pressure gaugeSJ Gauge gauge for low differential pressure measurement
    Model: PRMD

    Differential Pressure Gauge, Low Differential Pressure

    • Measures the small pressure difference between two pressure sources
    • Only suitable for measuring gases, can not measure liquid
    • Used in hospitals, laboratories, factories, gas stations and storage tanks
    • Same specifications as Series 2000 magnehelic®
  • SJ Gauge differential pressure gauge with mounting clamp
    Model: PRHD

    Differential Pressure Gauge, Double Diaphragm

    • High working pressure (static pressure) and high overload safety, selectable ranges up to 30 MPa
    • The use of high-quality stainless steel materials and the robust design are geared to applications in the chemical and process engineering industries
    • Suitable for liquid and gaseous media in aggressive environments
    • Equivalent specifications that closely match the WIKA 732.14
  • SJ Gauge pressure gauge installed for cryogenic tank serviceSJ Gauge industrial differential pressure gauge
    Model: PRLD

    Differential Pressure Gauge, Cryogenic Tanks

    • Supports cryotechnology; applicable for measuring low-temperature mediums
    • Oil-free is available for measuring special gases such as flammable and explosive gases
    • Commonly used to measure closed tank truck liquid levels for oil, liquid nitrogen, and other materials; also useful for filter monitoring

    ◼️ Fig.1: Differential pressure gauge model PRLD
    ◼️ Fig.2: With Option valve manifold with working pressure indication

  • SJ Gauge analog differential pressure gauge
    Model: PRMDS

    Differential Pressure Gauge, Mini

    • Small size with simple construction
    • Removable lens and rear-housing
    • Used in air conditioners, medical respiratory equipment and filters
  • SJ Gauge differential pressure manometer with two Bourdon tube elementsSJ Gauge pressure gauge with illuminated LED dial
    Model: PRDD

    Differential Pressure Gauge, Duplex

    • The pressure gauges are equipped with two independently working bourdon tube measuring systems
    • LED lighting for operating voltages of DC24V or AC110V
    • Typically used in filters and rail braking systems