Thermal mass flow regulator MV-391-HE

for gasprecisiondigital

Direct thermal mass flow measurement High accuracy Actual calibrated on Helium He Bright, graphical OLED display Digital or analog output; alarm and counter functions High precision needle valve Features Clear indication in: - actual flow rate (bar graph and value) - desired flow units - type of gas - totalised flow Bright, wide-angle OLED display Free of parallax error Virtually independent of temperature and pressure variations Low pressure drop Wide flow ranges Fast response High accuracy Configurable password protection Alarm and counter functions Relays High resolution needle valve Digitally calibrated Free software tools Technical specifications Accuracy ± 2% RD for flow > 50% of max. capacity ± (1% RD + 0.5% FS) on lower flows Technical specifications are based on Air at maximum FS Repeatability < 0.2% FS typical Pressure coefficient 0.2% / bar typical at Air Standard calibration gas Helium He Rangeability up to 1:20 Response time (sensor) (t63%) 2 seconds Operating temperature 0 … 50 °C (32 … 122°F) Temperature coefficient Zero: <0.1%FS/°C, Span: <0.2%RD/°C Leak integrity, outboard tested < 2 x 10-9 mbar l/s He Attitude sensitivity < 0,1 % FS Mechanical parts Material (wetted parts) Meter: aluminium, Viton® (FPM) Needle Valve: Fluorisint, Brass, Buna N Process connections G 1/4" BSPP female (compression fittings optional) Seals Viton®, PTFE Weight 0.7 kg Electrical properties Power supply +15 … 24 Vdc (+/- 10%) Max. power consumption approx. 135 mA Output 0 .. 5 Vdc EMC EU declaration