Bently Nevada 177230-01-02-05 Seismic Transmitter

Robust Vibration Transduction for Heavy-Duty Machinery

The Bently Nevada 177230-01-02-05 seismic transmitter converts mechanical vibration into a proportional 4-20 mA signal for continuous monitoring. This two-wire loop-powered device delivers a velocity output that accurately reflects machine casing vibration levels. Its housing measures 89 mm in height and 45 mm in diameter, with a weight of approximately 320 grams. The transmitter operates on a 10-30 Vdc supply voltage and provides a standard 4-20 mA output for direct connection to PLCs and DCS systems. This unit installs directly on bearing housings, pump casings, and compressor frames for reliable condition monitoring.

Measurement Range and Frequency Response

This seismic transmitter covers a full-scale velocity range of 0-50 mm/s peak, with a frequency response spanning 10 Hz to 1 kHz. The device achieves an accuracy of ±5% of full scale at 80 Hz, ensuring dependable vibration readings. Its internal sensing element employs a moving coil design with a permanent magnet for robust signal generation. The transmitter maintains stable operation across a temperature range of -30°C to +100°C, making it suitable for harsh industrial settings. Such performance characteristics enable early detection of bearing wear, imbalance, and misalignment faults.

Detailed Technical Specifications

Installation and Wiring Details

This transmitter includes a two-wire terminal block for simplified field wiring to any 4-20 mA input module. The housing attaches securely to machine surfaces using a 1/4-28 UNF mounting stud or optional adapter kits. A shielded twisted pair cable of up to 300 meters can connect the transmitter to the control room without signal degradation. The unit draws a maximum loop current of 25 mA and stores negligible internal energy. Users can pair this transmitter with the Bently Nevada 3500 Monitoring System or any standard analog input card for vibration data acquisition.

Application and Maintenance Guidance

This seismic transmitter excels in predictive maintenance programs for fans, motors, and centrifugal pumps. The 316L stainless steel housing resists corrosion from process fluids and washdown chemicals. Routine checks of the mounting stud torque ensure optimal mechanical coupling to the machine surface. Operators can verify the output signal using a handheld calibrator without disconnecting the loop wiring. This device requires no periodic recalibration, but users should inspect the cable and connector annually for mechanical damage. The robust design and loop-powered operation make this transmitter a cost-effective choice for continuous vibration protection.