Dwyer’s Handheld Digital Manometers

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Outline• Across the Board Features• Manometer Selling Features and Competition– 476A Single Pressure Manometer– 478A, 475, 490A, 477B, 477AV differential

pressure manometers• Applications• Questions

Introduction

• Wide Selection – Single Pressure – Differential Pressure – Air & Gas Measurement – Wet/Wet Measurement– High Accuracy

Across the Board Features

• 9 Volt Battery Powered – Up to 100 Hours of Use

• Extruded Aluminum Case • Ultra-fine Resolution on Low Ranges • Selectable Units of Measure• Includes Wrist Strap• Instructions Printed on Device• Carrying Cases, Air Flow Kits and More Available

476A & 478A Manometers

• Push Button Auto-Zero• ±1.5% FS Accuracy • Low Cost Design• 476A: Single Pressure – -20 to 20 in w.c.

• 478A: Differential Pressure– -4 to 4 in w.c. – -60 to 60 in w.c.

475 Digital Manometer

• Vast Array of Ranges (11 total)– Lowest Range: 0-1 in w.c. – Highest Range: 0-150 psi

• ±0.5% FS accuracy • Measures positive, negative & differential pressures• Air and compatible combustible gases– Can be used for natural gases

490A Hydronic Digital Manometer

• Liquid & Gas Pressure • 316L SS Wetted Materials• ±0.5% FS Accuracy • Memory Function (stores 40 readings)• Audible & Visual Overpressure Alarms• Adjustable Dampening Rate• Optional 3-Valve Manifold Block

477B Digital Manometer

• Measure Positive, Negative, or Differential Pressure

• Accuracy: 0.1% Full Scale• Stores up to 40 Readings • Audible and Visual Alarms• Backlit Display • Perfect for laboratory readings and checking

calibration of other instruments

477AV Digital Manometer

• Pressure, Velocity, and Flow Measurements– Programmable Duct Sizes – Useful with Pitot Tubes

• Measures Positive, Negative, & Differential Pressure• Backlit Display• Up to 40 stored readings

The Traverse Tool!

Manometer Accessories

• A-402A Carrying case– Snaps on belt loop for easy carrying

• A-47X-BOOT Manometer Boot– Extra protection for manometer– Magnetic mounting on back

Clean Room Checks

• Verifies that the correct pressure differential exists between the clean room surrounding outside area– Positively Pressurized: in case of leaks,

clean air leaks out instead dirty air and germs leaking in

– Negatively Pressurized: In case of leaks, clean air enters instead of the dirty air and germs leaking out

Dwyer 478A, 475, or 477B

Traverse Readings in Ducts

• Use with pitot tube or flow sensor

• Measure air flow in ducts to ensure proper system performance

• 477AV calculates average velocity and air flow

Dwyer 477AV

Gas Pressure Testing

• Checks natural gas input to furnaces, boilers, and other gas-fired units

• Low pressure creates small, unsafe flame that cannot combust all gas

• High pressure creates large, hot flame that can cause overheating and warping

• Measure post-regulator and make adjustments

Dwyer 475

Filter Pressure Drop

• Measures the Difference Between the Pressure Pre-filter and Post-filter

• Increase in Differential Pressure Indicates Dirty Filter

Dwyer 478A or 475

Balancing Water Loops

• Measuring actual flow compared to design flow to optimize system performance

• Heating and cooling water systems

• Unbalanced water flow in a building causes higher operating costs and comfort issues

Dwyer 490A

Pressure Head Loss

• Energy lost from flowing fluid due to friction– Major loss: pressure lost due to friction in pipes– Minor loss: pressure lost due to tees, bends, valves,

obstructions• Ensures proper flow to all areas of the water

system

Dwyer 490A

Verifying Calibration

• Compare pressure readings of other instruments to highly-accurate 477B to verify they are reading correctly

Dwyer 477B