Bently Nevada 74712-06-05-03-00 Seismoprobe Velocity Transducers Dual Probe Transducer

Description Bently Nevada Seismoprobe Velocity Transducer Systems are designed to measure absolute (relative to free space) bearing housing, casing, or structural vibration. The two-wire systems consist of a transducer and appropriate cable. The Seismoprobe family of velocity transducers is a two-wire design that uses moving-coil technology. It provides a voltage output directly proportional to the transducer's vibration velocity. Moving-coil transducers are less sensitive to impact or impulsive excitation than solid-state velocity transducers, which are inherently accelerometers with embedded integration electronics. Moving-coil transducers are less sensitive to impact or impulsive excitation and can represent a good choice for certain applications. Because they don’t require external power, they are convenient for portable measurement applications.

 

74712: The 74712 is a high temperature version of the 9200.

 

Specifications Specifications are at approximately +22°C (+72°F) with 25 mm/s (1 in/s) of machine casing vibration at 100 Hz (6000 cpm) with a 10 kΩ load unless otherwise specified.

Electrical Sensitivity 20 mV/mm/s (500 mV/in/s), ±5% when properly terminated and oriented at the angle of calibration. Calibration Load 10 kΩ Terminal "A" to "B" Output taken across pins "A" and "B"

Sensitivity Temperature Coefficient 0.2%/°C Frequency Response - See Theoretical Velocity Seismoprobe Frequency Response on page 10. 4.5 to 1000 Hz (270 to 60,000 CPM); +0, -3dB typical. 10 to 1000 Hz (600 to 60,000 CAM); +0, -3dB typical. 15 to 1000 Hz (900 to 60,000 CPM); +0, -3dB typical.

Frequency response From minimum operating frequency (see Ordering Information) to 1 kHz (60,000 cpm); +0, -3dB typical. Please contact Bently Nevada for detailed calibration data.

Dynamic operating range 2.54 mm (0.100 in) peak to peak maximum displacement. Velocity Range 25 mm/s (1 in/s) (at +22 °C of casing vibration at 100 Hz with a 10 kΩ load. Coil Resistance 1.25 kΩ ±5% Locked Coil Inductance 125 mH, typical Amplitude Linearity ±5% from 0.01 to 5.0 in/s (0.254 to 127 mm/s) at 100Hz (6000CPM)

Shock resistance Withstands 50 g peak maximum acceleration along non-sensitive axis. Transverse sensitivity ±10% maximum of the sensitive axis sensitivity at 100 Hz and 1.0 in/s (2.54 cm/s)

Polarity of output signal Pin A goes positive with respect to Pin B when the transducer case velocity is towards the connector. Lead wire length 305 meters (1,000 feet) maximum between Seismoprobe Velocity Transducer and 3300 or 3500 Monitor. Consult manual for frequency roll-off at longer lengths.