Manometer
Product Overview
A manometer is a pressure-measuring instrument that uses the height of a liquid column (or a mechanical/electronic element) to indicate pressure. It is widely used for low-pressure measurement of gases and liquids in laboratories, HVAC systems, industrial processes, and calibration applications. Manometers are valued for their simplicity, accuracy, and reliability, especially at low pressures.
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How it works (simple explanation)
A manometer compares an unknown pressure to a reference pressure (usually atmospheric pressure) by observing how far a liquid moves inside a tube:
- When pressure is applied, it pushes the liquid column.
- The difference in liquid height corresponds to the applied pressure.
- The higher the pressure, the greater the height difference.
What it measures
- Gauge pressure
- Differential pressure
- Vacuum or low negative pressure
- Low-range process pressure
Key advantages
- Simple and reliable design
- High accuracy for low pressures
- No external power required (for liquid manometers)
- Ideal for calibration and reference measurements
- Low maintenance and long service life
Applications
- HVAC system testing and balancing
- Laboratory experiments and research
- Gas pressure measurement
- Filter and duct pressure monitoring
- Calibration of pressure instruments
- Medical and pharmaceutical equipment
Installation
- Mount vertically for accurate readings
- Ensure the reference side is open to atmosphere (for gauge measurement)
- Avoid vibration and temperature extremes
- Select appropriate manometer fluid for the process medium
- Connect pressure ports securely to prevent leaks
Technical Specifications
Parameter | Specification |
Measurement Type | Gauge / Differential / Vacuum |
Pressure Range | Very low pressure (e.g., ±10 Pa to several kPa) |
Accuracy | ±0.5% to ±1% of full scale |
Sensing Medium | Liquid (water, mercury, oil) or mechanical |
Display | Scale graduation or digital (for electronic types) |
Operating Temperature | Typically –10 °C to +60 °C |
Mounting | Wall-mounted or panel-mounted |
Power Supply | Not required (liquid type) / Battery or DC (digital type) |
Process Connection | Hose barb or threaded connection |
Housing Material | Glass, plastic, or metal |