Configured for integration with PLC and DCS platforms, the Bently Nevada 177230-02-01-05 (177230 Series Seismic Transmitter) converts broad-band seismic vibration into a proportional 4-20 mA analog current loop signal.

Electrical & Mechanical Characteristics

Cross-Talk Suppression and Loop-Powered Interface

The ceramic shear-element design provides high rejection of base-strain and transverse motion, minimizing cross-talk from adjacent machinery. The device operates as a 2-wire loop-powered transmitter, sourcing current proportional to RMS vibration velocity. It requires no field calibration or zero adjustment. Signal linearity is maintained across the 12-30 VDC excitation range, allowing direct interface to analog input cards without external signal conditioners.

Technical Inquiries

Q: Does this transmitter support HART protocol?

A: No. The 177230 outputs a standard 4-20 mA analog signal only. It does not support digital communication protocols.

Q: What is the maximum loop cable length?

A: Maximum cable length is determined by the power supply voltage and loop resistance. Ensure compliance with Ohm's law to maintain at least 12 VDC at the transmitter terminals under load.

Q: Can it be mounted on a magnetic base?

A: Yes. However, roll the magnetic base onto the surface. Avoid "snapping" it into place, as the resulting mechanical shock can generate voltage spikes that damage the internal circuitry.

Field Installation Guidelines

Mount the transmitter directly to a clean, flat machine surface using the integral stud. Apply a torque of 20 N·m (177 lbf·in). If using a magnetic base, ensure proper seating without impact loading. Use shielded twisted-pair cable for the 4-20 mA loop. Connect the shield drain wire to the PLC/DCS ground terminal only. Verify the loop power supply provides sufficient voltage headroom for the selected cable length.

Ordering Information

• 177230-02-01-05 Seismic Transmitter
• 4-20 mA loop-powered configuration
• Multiple agency approvals included

Dispatch & Packaging

Dispatch occurs within 3-5 days after payment clearance via DHL / FEDEX / UPS. Each transmitter is sealed in anti-static ESD shielding and foam-packaged to prevent piezoelectric damage during transit.