HLX75 Series
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High-Precision Air / Gas Velocity Transmitter for Industrial Applications The HLX75 series air velocity transmitters were developed to obtain accurate measuring results over a wide range of velocities and temperatures. A high-quality hot film sensor element based on cutting-edge thin film technology ensures maximum sensitivity, even at lowest mass flows. At the same time, the innovative probe design produces reliable measuring results at high flow velocities of up to 40m/s (8000ft/min). The integrated temperature compensation minimises the temperature cross-sensitivity of the HLX75 series which, combined with the robust mechanical design, allows it to be used at process temperatures between -40 to +120°C (-40 to 248°F). In addition to air velocity and temperature values, the transmitter calculates the volumetric flow rate in m³/min or ft³/min. The cross section of the duct needs to be determined for this purpose and the volumetric flow rate can be displayed and directed to one of the analogue outputs. The configuration software included in the scope of supply allows to choose the appropriate output parameter and freely scale the display range and signal level of the two analogue outputs. In addition user-friendly calibration of the air velocity and temperature and the adjustment of key parameters (e.g. response time of the velocity measurement, low flow cut-off points, etc.) are supported as well. An optional illuminated display with two control buttons integrated in the cover is available. In addition, this enables changes of the configuration to be made directly on the unit. The HLX75 series has a robust metal housing to protect against possible damage in rough industrial environments. There are five different models, providing a comprehensive range of mounting options: - Model A for wall mounting Model B for duct mounting Model C with remote probe Model E with remote probe, pressure-tight up to 10bar (145psi) The HLX75 series can be used to measure the velocity of other gasses as well, although a correction has to be applied to the unit at the factory. Typical Applications - monitoring incoming and outgoing air (energy management) in HVAC applications - filter monitoring and laminar flow control in cleanrooms - exhaust systems, exhaust hoods and glove boxes in the pharmaceutical, bio and semiconductor industries - mass flow measurement during incineration processes - monitoring and measurement of compressed air systems - air conveying systems - wind tunnels and climate simulators Features high accuracy working range 0...40 m/s (0...8000ft/min) and -40...120°C (-40...248°F) measurement of air velocity and temperature calculation of volumetric flow rate low dependence on angle of inflow probe diameter 8mm (0.3”) remote probe up to 10m (32.8ft) easy mounting and maintenance correction for pressure, humidity and media low flow cut-off pressure tight up to 10bar (145psi) SI and US units selec

Technical Data Measuring value Air velocity Working range 0... 2m/s (0...400ft/min) 0... 10m/s (0...2000ft/min) 0... 40m/s (0...8000ft/min) 1) 2) Accuracy in air at 25°C (77°F) 0.06... 2m/s (12...400ft/min) ± 0.03m/s / 6ft/min at 45% RH and 1013hPa 0.15...10m/s (30...2000ft/min) ± (0.10m/s / 20ft/min + 1 % of measuring value) 0.2... 40m/s (40...8000ft/min) ± (0.20m/s / 40ft/min + 1 % of measuring value) 1) Uncertainty of factory calibration ± (1% of measuring value, min. 0.015m/s (3ft/min)) Temperature dependence electronics typ. -0.005 % of measuring value / °C Temperature dependence probe...

The innovative design of the probe head minimises the effect of the angle of inflow on the measuring result. The deviation of the measuring value remains < 3% up to an angle of inflow (α) of ± 20° between the direction of inflow and the sensor element's longitudinal axis. velocity measuring error [%] Angular Dependence Low flow cut-off Small temperature differences in shut-off pipes and ducts can cause minimal flows. Even these would be detected and measured by the HLX75. The resulting fluctuations in the output signal can be suppressed by the low flow cut-off. Cut-off point and switching...

code “probe length” code “cable length” code “probe length” code “probe length” code “cable length” (0.3”) code “probe length” HLX75-VTE Remote, pressure tight probe up to 10 bar (145psi) (included in the scope of supply)

Hardware Configuration Output Working range Probe length Cable length Display Pressure tight feedthrough Plug 0...10V 4...20mA 0...2m/s (0...400ft/min) 0...10m/s (0...2000ft/min) 0...40m/s (0...8000ft/min) 200mm (7.9”) 400mm (15.8”) 600mm (23.6”) 2m (6.6ft) 5m (16.4ft) 10m (32.8ft) without display with display 1/2” ISO thread 1/2” NPT thread cable glands 1 plug for power supply and outputs 2 plug for power supply / outputs and USB 1 plug for USB Software Configuration Physical parameters of outputs Measured value units Scaling of v-output in m/s or ft/min Measurement media Select according...