FLOXACTTM PROBE Multifunctional air flow probe FloXact probe measures air velocity / air volume in HVAC systems. Its intelligent design makes for easy installation in existing ducts or terminals. Operating on the pitot tube principle, FloXact probe measures the total (PTOTAL) and static (PSTATIC) pressure components of air flow. The probe determines average air velocity, measured over 6, 8, or 10 precisely positioned sensing ports, depending on the length of ducts. The unique shape (patent pending) of the probe profile creates a linear amplification of at least 2.5 times the velocity pressure (PVEL), providing accurate measurement of lower air velocities down to 1.0 m/s (200 FPM). Chamfered entrances to the sensing ports eliminate air-direction affects, making the FloXact probe insensitive to approaching multi-directional, rotating airflow with yaw and pitch up to 30º from straight flow. FloXact probe is easy to install and completes an accurate and costeffective air flow station, when combined with a differential pressure transmitter. The probe integrates with most differential pressure transmitters, yet improved accuracy is obtained when output is linear to airflow rather than pressure. HK Instruments DPT-Flow line of air flow transmitters pairs well with FloXact probe. KEY FEATURES • Multi-point averaging based on the “Log-Tchebycheff“ method, providing greater accuracy • Chamfered sensing points ensure consistent readings • Easy installation in existing air ducts or terminals • 2% accuracy • 2.5 times linear amplification of Velocity Pressure • Accepts 1/4” OD tubing Easy installation with sizing that matches existing ducts. HOW IT WORKS FloXact probe operates on the pitot tube principle measuring the total (PTOTAL) and static (PSTATIC) pressure components of air flow. Pressure ports located on the leading surface of the probe sense the total pressure (PTOTAL) and pressure ports on the trailing surface sense the static pressure (PSTATIC). The difference between the total pressure and the static pressure is velocity pressure (PVEL), which relates to the squared air velocity as: PVEL = ½ x p x v2 PVEL = velocity pressure (Pressure units i.e. Pa, inWC, etc.) p = density of the gas (air) in kg/m3 v = velocity in m/s To simplify calculations and provide for amplification and air duct area (allowing calculation of air volume), FloXact probes have a KVOL value, which are outlined in FloXact installation instructions. Air volume can be determined with this formula: Q = KVOL x √PFP Q = air volume in l/s KVOL = Kvol value in l/s/Pa (see Installation Instructions chart) PFP = pressure difference measured by probe Velocity pressure (PVEL) times the amplification factor) in Pa

specifications Performance Accuracy: ±2.0 % Technical Specifications Media compatibility: Dry air or non-aggressive gases Measurement units: Pa, m/s, l/s Environment: Operating temperature: 5...95 °C Storage temperature: -20...95 °C Humidity: 0 to 95 % rH, non condensing Physical Dimensions: Probe: < 200 mm: 15 x 20 x Lenght (mm) > 200 mm: 25 x 20 x Length (mm) Mounting plate: 60 W x 50 H x 1.5 D (mm) Lengths: Round: All standard round duct sizes up to 1200 mm. (100, 125, 160, 200, 250, 315, 400, 450...1200 mm) Rectangular: 250, 300... 1200 (50 mm steps) Additional lenghts available on request. Mounting: 2...