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Summary of Contents for Digi-Sense 20250-13
- Page 1 User Manual Pressure and Flow Meter with NIST-Traceable Calibration Model 20250-13 P/V/F THE STANDARD IN PRECISION MEASUREMENT...
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Page 3: Key Features
Introduction The Digi-Sense Pressure and Flow Meter (Model 20250-13) measures differential and static pressure, and calculates air velocity and airflow. This heavy-duty meter ensures proper airflow balance and monitors air pressure across key HVAC components—promoting good indoor air quality and a comfortable environment. -
Page 4: Meter Description
Meter Description 1. Pitot tube 2. Input port (+); white tubing 3. Reference port (–); black tubing 4. Temperature sensor 5. LCD Power on/off button 6. Press to turn the meter on and off. 7. Press MAX/MIN button to step through the maximum, minimum, and average P/V/F readings. -
Page 5: Display Functions
Display Functions 10 11 1. Hour:min and min:sec icons 2. Pressure, velocity, flow and temperature modes 3. Primary display 4. Units of air velocity (knots, MPH, ft/min, m/s, km/h) 5. Units of pressure (psi, mbar, in. H O, mm H O, Pa) 6. -
Page 6: Changing Setup Options
Changing Setup Options Use the Setup mode to choose duct shape and dimensions, set duct parameters, set which measurement parameters are displayed, change sleep mode, and clear memory. The meter stores the new settings into its memory. Option Menu item Settings Duct dimensional units Unit... - Page 7 Setting the Duct Dimensional Units 1. While the meter is in Setup mode, press /Unit or Unit/ button to scroll to the duct dimension units setup option (Fig. 1). Fig. 1 Fig. 2 2. Press Avg/Rec button to access the units; “cm” will appear on the display (Fig. 2). 3.
- Page 8 Changing Setup Options (continued) Setting Duct Parameters 1. If duct shape is rectangular, the width of duct numbers and “W=” will appear on the display (Fig. 5). 2. Press /Unit or Unit/ button to move the position of the decimal point. 3.
- Page 9 Clearing Memory Data 1. While in Setup mode, press /Unit or Unit/ button to scroll to the Clear Memory setup option (Fig. 7). 2. Press Avg/Rec button to access the choices (Fig. 8). 3. Press SAVE/CLEAR button to toggle between four selections: PRESS VEL FLOW = all pressure, velocity and flow sample data PRESS = only pressure sample data VEL = only velocity sample data...
- Page 10 Changing Setup Options (continued) Selecting which Measurement Parameters are Displayed 1. While in Setup mode, press /Unit or Unit/ button to scroll to the Measurement Type setup option (Fig. 9). 2. Press the Avg/Rec button to access the three types. Use the /Unit or Unit/ button to toggle between the three choices: Fig.
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Page 11: Setup And Operation
Setup and Operation Measuring Pressure The gauge/differential pressure value is shown on the primary display. 1. Press P/V/F button to enter the pressure measuring mode; PRESS icon will appear. 2. Use /Unit or Unit/ button to toggle between five units of measurement (psi, mbar, in. - Page 12 Setup and Operation (continued) Measuring Air Velocity The meter uses standard ambient conditions (temperature @ 70°F/21.1°C, barometric pressure @ 14.7 psi/1013 mbar) to approximate actual air velocity and airflow. Air velocity value is shown on primary display. 1. Press P/V/F button to enter the air velocity measuring mode; VEL icon will appear.
- Page 13 Measuring Airflow The airflow value is shown on the primary display. 1. Press P/V/F button to enter the airflow measuring mode; FLOW icon will appear. 2. Use Unit/ button to toggle between two units of measurement (CFM or CMM). 3. Press P/V/F button to access the Duct Shape screen. The display shows the previously entered duct shape and size.
- Page 14 Setup and Operation (continued) Saving Measurement Samples The meter can save up to 99 samples in each of the three measuring parameters. Once the memory is full for a measuring parameter, “FU” will appear under the MEM icon and the meter will emit a short beep. You will not be able to save any additional samples until some or all saved data samples are deleted for that parameter.
- Page 15 Recording/Data Logging Operation (Software) 1. First install software on PC following the setup wizard (see “Software Installation” below). Once software is successfully installed, the “Mano and Flow” software icon shortcut will be automatically placed on your PC desktop. 2. Connect the meter to your PC via the supplied USB cable. 3.
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Page 16: Software Installation
Software Installation 1. Insert the CD into the PC. 2. Double click the set up.exe file to launch the software installation program. 3. Follow the installation wizard to complete the installation. 4. If the USB driver needs to be updated or driver error message is received, please go to the folder with driver on the CD and double-click the file CP210xVCPInstaller.exe to update the driver. -
Page 17: Specifications
Specifications Units Range Resolution Accuracy Pressure 0 to 0.7252 0.0001 mbar 0 to 50 0.01 ±0.3% in. H 0 to 20.07 0.01 full-scale mm H 0 to 509.8 0 to 5000 Air Velocity m/s (meters per sec) 1.00 to 80.00 0.01 —... - Page 18 Replace the 9 V battery in the rear battery compartment by removing the cover. Ensure that the cover is securely refastened when finished. It is recommended that Digi-Sense products are calibrated annually to ensure proper function and accurate measurements; however, your quality system or regulatory body may require more frequent calibrations.
- Page 20 For Product and Ordering Information, Contact: Toll-Free: 1-800-358-5525 Phone: 1-847-327-2000 Fax: 1-847-327-2700 Davis.com/Digi-Sense 1065DGMAN_20250-13 Rev.1 Manual Part No. 00100-52...
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