Handheld Micromanometer – Model 6850

Designed for HVAC Duct Traverse and Airflow Testing

For HVAC technicians performing duct traverses, the Model 6850 simplifies the process of converting velocity pressure measurements into useful air velocity and airflow data. When used with a compatible Pitot tube, the instrument calculates air velocity from measured pressure and can determine volumetric airflow based on the dimensions of the duct.

Users can enter dimensions for either round or rectangular ducts directly into the instrument, allowing the 6850 to calculate airflow from the measured air velocity and duct cross-sectional area. A configurable Pitot factor also allows the instrument to account for the correction factor specified for the Pitot tube being used.

Measure Differential Pressure, Air Velocity, and Airflow

The Model 6850 provides the primary measurements HVAC professionals need when evaluating duct systems with a Pitot tube. Its high-resolution differential pressure measurement capabilities support accurate assessment of relatively small pressure changes, while onboard calculations convert those measurements into air velocity and volumetric airflow.

The instrument supports multiple engineering units, including Pa, inH2O, mmH2O, and mmHg for differential pressure; m/s and ft/min for velocity; and m³/h, CFM, and L/s for airflow. This flexibility makes the 6850 practical for HVAC testing workflows that use either SI or commonly used U.S. measurement units.

Actual and Standard Airflow Measurements

Air velocity can vary with environmental conditions such as temperature and atmospheric pressure. To support more consistent airflow analysis, the Model 6850 provides both actual and standard measurement modes.

Users can enter the current air temperature and atmospheric pressure so the instrument can calculate actual air velocity or convert measurements to standard air conditions. This capability is particularly useful when HVAC airflow measurements need to be compared across changing environmental conditions or documented using standardized values.