Linearized Velocity Sensor LVS-301 Omnidirectional Monitoring solution Frequency response down to 0.5Hz Built-in linearization micro-electronics circuit for low fre- Shaft & bearing vibration absolute quency amplitude and phase compensation • Models for horizontal and vertical mounting positon Stainless steel body Dynamic signal carried on DC bias voltage Push-Pull Connector or integral cable Typical applications Hydrogenerators Pumps, fan, cooling towers... Gas & steam turbines DESCRIPTION The LVS-301 velocity sensors have been designed for low frequency vibration monitoring applications of rotating machines. More specifically, the sensors fulfil the special low frequency requirements of very low speed hydroelectric machines. The LVS sensors operate in accordance with the electrodynamic principle and are used for measuring the bearing absolute vibration of the machines. The sensing element of the sensor is a coil supported by high precision springs moving around a permanent magnet which produces a voltage directly proportional to the vibration velocity. By design, the sensor has an excellent sensitivity and linearity down to very low vibration levels. The built-in electronics allows the sensor to accurately monitor vibration frequency down to 0.5Hz. The sensor provides two voltage outputs proportional to the vibration velocity : • A raw output corresponding to buffered non-linearized signal • The low frequency linearized vibration signal for monitoring purposes down to 0.5 Hz • The sensor can be powered with +24VDC or -24VDC depending on the ordered version. The sensor can be wired by push-pull connector (C3), so the extension cable can be detached during installation. Or by integral cable (C1).

GLOBAL SPECIFICATIONS OPERATION Sensitivity Transverse sensitivity Horizontal vs Vertical sensitivity Maximum displacement Natural frequency Resonance Frequency Output Impedance Output bias voltage Output bias voltage tolerance Maximum output voltage Temperature coefficient Typical frequency response at 2mm/s Analog band pass filter Power 100mV/mm/s ±5% (Vertical) < 7% max. of nominal 0.5-28Hz < +10%, 28-1500 Hz < +2% 1.52mm peak-peak 28Hz typ. >4kHz Linearized Raw 100Q + 12V or +6V for +24Vdc / -12V or -6V for -24Vdc ±5% of bias voltage 10V peak for 12V bias / 5V peak for 6V bias 0.1%/°C (<0.3%/°C...

MECHANICAL DRAWING

ORDERING INFORMATION Ordering code 05.301.028 C Y L C - Cable Options 1 Integral cable 3 Push-pull connector L - extension cable length 5m 10m Part Stud M10 to M8 Stud M10 to M6 Temporary mounting magnet : See PMH-140 MC-monitoring Quality certifications LOCAL REPRESENTATIVE MC-monitoring SA Route Andre Piller 19 CH-1762 Givisiez | Switzerland Phone : +41 58 411 54 00 Mail : [email protected]