DPG-A Differential Pressure Gauge for Shelters
The DPG-A Differential Pressure Gauge is a mechanical instrument designed to measure and monitor differential pressure in protected shelter environments. According to the product description, the gauge is intended for monitoring the pressure difference between shelter compartments, such as the main shelter chamber and an airlock, as well as between a protected area and the outside environment.
Differential pressure monitoring in shelters
Differential pressure is the difference between the pressure measured at two separate points.
In a protected facility, monitoring this difference can provide information about the pressure relationship between different areas of the structure. The DPG-A is specified for measuring this differential pressure between shelter compartments or between the protected interior and the external environment.
The product description identifies overpressure as an important part of the protection layer in a shelter and states that its values should be continuously monitored.
Mechanical measurement principle
The gauge belongs to the Magnehelic® differential-pressure gauge family. Dwyer describes the Magnehelic principle as a diaphragm-based measurement system: differential pressure is applied to opposite sides of a diaphragm, causing diaphragm displacement that is mechanically transferred to the indicating mechanism. dwyeromega.com
This design allows differential pressure to be displayed directly on an analog dial without requiring electrical power for the basic measurement function. Dwyer describes the Series 2000 Magnehelic gauge as a low-differential-pressure gauge that requires no power. dwyeromega.com
Measurement range
The product is identified as a 0–25 mmWC differential pressure gauge.
mmWC means millimetres of water column, a pressure unit commonly used for relatively low differential pressures in ventilation and air-handling applications.
Dwyer's documentation confirms that Magnehelic gauges are available in multiple metric water-column ranges, including 0–25 mm w.c. dwyeromega.com
Applications in protected facilities
According to the product description, the gauge can be used to monitor differential pressure:
between the main shelter chamber and an airlock;
between different shelter compartments;
between a protected area and the outside environment.
This makes differential-pressure indication relevant to ventilation and pressure-monitoring arrangements in protected spaces.
The gauge itself should be regarded as a measurement instrument, rather than as a complete pressure-control or ventilation system.
Why differential pressure is monitored
A pressure difference exists when two connected spaces or environments have different air pressures. In a shelter ventilation system, monitoring this difference provides an observable value that can be used to assess the pressure relationship between the protected space and another reference point.
For this reason, differential-pressure gauges are commonly associated with ventilation and air-handling systems. Dwyer specifically describes its Magnehelic gauges as instruments for measuring low differential pressure and lists applications associated with air-handling systems. dwyeromega.com
Installation and measurement connections
Dwyer's installation documentation specifies separate high-pressure (+) and low-pressure (−) connections. The tubing from the higher-pressure source is connected to the positive port, while the lower-pressure source is connected to the negative port. assets.dwyeromega.com
The manufacturer also specifies that the gauge should be mounted vertically and in a location free from excessive vibration. assets.dwyeromega.com
Before operation, the gauge can be zeroed with both pressure connections exposed to atmospheric pressure, using the external zero-adjustment mechanism described in the manufacturer's documentation. assets.dwyeromega.com
Main product information
Parameter | DPG-A |
Product type | Differential pressure gauge |
Measurement range | 0–25 mmWC |
Measurement principle | Mechanical differential-pressure indication |
Application | Shelter differential-pressure monitoring |
Measurement points | Between shelter compartments or protected area and outside |
Product price shown | €464.00 |
Tax | Excluding sales tax |
The price and product configuration above correspond to the product page provided for the DPG-A.
Role in a shelter ventilation system
A differential-pressure gauge does not create overpressure and does not regulate airflow by itself. Its function is to measure and display the differential pressure between two connected pressure points.
In a complete shelter ventilation installation, the measured pressure is related to the operation of other components, such as ventilation equipment, filtration equipment, valves and air ducts. The gauge provides the operator with a direct indication of the pressure difference.
This distinction is important when specifying equipment: the DPG-A is a monitoring instrument, while pressure generation and control are functions of the associated ventilation system.
Technical documentation
Dwyer's documentation provides installation guidance for Magnehelic differential-pressure gauges, including pressure-port identification, vertical mounting, zero adjustment and installation considerations. assets.dwyeromega.com
The manufacturer's published information also confirms that Magnehelic gauges are available with a broad range of differential-pressure scales, including metric water-column measurements. dwyeromega.com
Conclusion
The DPG-A Differential Pressure Gauge is designed for monitoring differential pressure in protected shelter environments. The specified 0–25 mmWC range makes it suitable for observing relatively low pressure differences between shelter compartments or between a protected space and the external environment.
Its principal function is straightforward: measure and display differential pressure so that the pressure condition of the protected space can be monitored continuously.
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