When selecting a differential pressure gauge for an HVAC system, a critical factor is the display unit on the dial. Depending on engineering habits or design standards, projects may require either mmH2O or Pa units. Dwyer offers both options with the 2000-300MM (mmH2O) and 2000-300PA (Pa) models within the same Magnehelic® 2000 Series, featuring an equivalent measuring range of approximately 300 units.
1. Comparing the 2000-300MM and 2000-300PA
Both models belong to the Magnehelic® 2000 Series – utilizing diaphragm and magnetic technology that requires no power supply, allowing for direct readings on a mechanical dial. The only difference is the display unit: the 2000-300MM shows mmH2O (common in Asian technical standards), while the 2000-300PA displays Pascals (Pa) – the international SI unit. Engineers should choose the unit precisely specified in the project's design documents.
2. Detailed Specifications
|
Specification |
Details |
|
Model |
2000-300MM (mmH2O) & 2000-300PA (Pa) |
|
Manufacturer |
Dwyer (DwyerOmega) – US Brand, USA or Mexico facility |
|
Service |
Air and non-combustible, compatible gases |
|
Accuracy |
±2% of full scale @ 70°F (21.1°C) |
|
Pressure Limits |
-20 inHg to 15 psig (-0.677 to 1.034 bar) |
|
Dial Size |
4" (101.6 mm) diameter |
|
Warranty |
12 months (upgrade to 36 months available) |
3. Installation and Operation Guide
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Select the model matching the unit (mmH2O or Pa) specified in the design documents to avoid data recording errors.
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Mount the gauge with the diaphragm in a vertical position to ensure the stated ±2% accuracy; consult the manufacturer for other mounting orientations.
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Connect pressure signal tubing to the 1/8" NPT High and Low ports using the provided fittings, ensuring an airtight seal.
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Calibrate the zero point using the front zero-adjustment screw before official operation.
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Perform periodic checks and cleaning (every 6-12 months), especially in dusty environments.
⚠️ Important Note: If a project utilizes both mmH2O and Pa gauges, clear labeling should be applied at each location to prevent operator confusion.
4. Common Applications
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Monitoring differential pressure across air filters in AHU/FCU systems.
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Differential pressure control in cleanrooms and laboratories based on specific design standards.
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Monitoring fan and duct pressures in industrial ventilation networks.
5. Why Buy the Series 2000 from DLK?
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✅ 100% Genuine Dwyer products, directly imported with full CO/CQ.
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✅ Expert consultation to choose the correct unit and range for your project.
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✅ Fast technical support and transparent warranty.
📞 Contact DLK for Consultation & Quotations
Looking to buy genuine Dwyer Series 2000 gauges? Contact DLK today for the best prices.
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