FHG1000-Series

FHG-1000 flow meters measure the flow rate based on the screw pump principle. A pair of rotors fitted precisely into the housing constitutes the measuring element. An integrated gear and non-contact signal pick-up system detects the rotations of the measuring element and converts them to digital pulses. Together with the housing walls, the rotor edges form closed measuring chambers in which the fluid is transported from the inlet to the outlet side. The fluid volume put through within one main rotor rotation is the rotation volume, which is divided by the sensing gear and digitized, processed and output in the sensor module.

Sensor System Explanation
The non-contact pick-up system consists of two GMR-bridges (sin/cos), which are located in a sensor unit in cartridge design. It detects the movement of the sensing gear and routes the sin/cos-signals to the preamplifier electronics. The preamplifier electronics digitize and amplify the sensor signals and multiply them by a high-resolution interpolator using adjustable settings. The square wave signals are bidirectional and can be utilized by any evaluating instrument as well as computers and PLC-controls. The resolution is selectable in steps from factor 1 to 128. In case of an 1-channel evaluation, a separate directional signal is available. An adjustable pulse filter can offset and suppress negative flows (e.g. generated by vibrations) while still in the device. The frequency of the output signals is proportional to the flow (volume flow) and depends on the respective flow meter size. The frequency range is from 0 to 100 kHz. The preamplifier is protected against reverse polarity and incorrect connection. It is suitable for fluid temperatures of -30 to 120°C (-22 to 248°F) and is mounted directly on the flow meter.