Bently Nevada 177230 Seismic Transmitter

Overview

The Bently Nevada 177230 Seismic Transmitter is a simple, loop-powered vibration transmitter that connects directly to the analog inputs of a programmable logic controller, DCS or SCADA system. It turns casing vibration into an industry-standard 4-20 mA signal proportional to velocity, so plants can trend vibration and raise alarms in the control system they already operate, without installing a separate monitoring rack. Baker Hughes designed it to need no field configuration and few additional parts, which reduces training, maintenance and service cost while helping operators avoid unexpected machinery failures.

Seven Star LLC supplies the Bently Nevada 177230 to oil and gas, power, water and industrial customers in Oman and the GCC. Our engineers in Muscat help users select the right measurement range, frequency response and approvals option, and supply the matching armoured or unarmoured interconnect cables and stud adapters so that each Bently Nevada 177230 can be installed in one visit.

Measurement Principle

Inside the hermetically sealed stainless steel body a ceramic shear-mode accelerometer element senses casing acceleration. The electronics integrate this signal to velocity and convert the broadband level into the 4-20 mA loop current between pin A and pin B, where 4 mA represents zero vibration and 20 mA represents the selected full scale range. With the 10 Hz to 1 kHz frequency option the output is proportional to RMS velocity, and with the 3 Hz to 1 kHz option it is proportional to peak velocity, which helps on slower machines. Output settles within 2 percent of final value in less than 15 seconds after power up.

In addition to the loop current, the Bently Nevada 177230 provides an unbuffered dynamic acceleration signal on pin C, referenced to pin B, with a sensitivity of 100 mV/g and a frequency response of 2.5 Hz to 10 kHz. Maintenance staff can connect a portable data collector to this signal to examine spectra and waveforms when the trend in the control system rises, combining simple alarming with deeper diagnostic capability. The mounted resonant frequency is above 12 kHz and transverse sensitivity is below 5 percent.

Engineering Design of the Bently Nevada 177230

The transmitter body is 316L stainless steel, 25.4 mm in diameter and 66 mm high, weighing about 131 g, with a three-pin MIL-C-5015 connector, also in 316L stainless steel. It is hermetically sealed and rated to 100 percent relative humidity when not submerged, and it operates from -40 °C to +85 °C, which suits outdoor skids in hot, dusty and humid coastal environments. The base has a quarter-inch 28 UNF mounting hole, and M6, M8 and quarter-inch 28 UNF stud adapters are provided with each device; mounting torque is 4 to 7 N-m.

Electrically the device needs 12 to 30 V dc excitation with current limited to 40 mA, matching the internal loop supplies of typical PLC and DCS input cards. Isolation exceeds 10 to the 8th ohms with a breakdown voltage of 600 V rms. Baker Hughes stresses that pin B must stay isolated from ground, and that when a magnetic base is used the transmitter should be rolled onto the machine rather than snapped on, because the impact spike can damage the electronics.

Key Features

The Bently Nevada 177230 offers a straightforward route to continuous vibration monitoring.

• Loop-powered 4-20 mA output proportional to RMS or peak velocity, ready for PLC, DCS and SCADA inputs.
• Three full scale ranges: 12.7, 25.4 and 50.8 mm/s (0.5, 1.0 and 2.0 in/s).
• Unbuffered 100 mV/g acceleration output for portable analysers and diagnostics.
• No field configuration or adjustment, with built-in self-test.
• Hermetically sealed 316L stainless steel case and connector for harsh environments.
• Operating temperature from -40 °C to +85 °C.
• Intrinsically safe Zone 0/1 and Zone 2 approvals under ATEX/IECEx, plus Class I Division 1 and 2.
• Maritime classification approvals from DNV for ship, high-speed craft and offshore use.

Industrial Applications

The Bently Nevada 177230 suits pumps, fans, blowers, cooling towers, motors and gearboxes where operators want vibration levels in the control system rather than in a separate monitoring rack, and where the sensor point count is small enough that a dedicated monitor would add cost without adding useful information. In Oman common uses include water injection and transfer pumps at oil field stations, cooling water and seawater pumps at power and desalination plants, air coolers and fans at gas plants, and conveyors and crushers in mining and cement plants. Where an older two-wire transmitter is installed, engineers often compare it with the Bently Nevada 990-04-70-01-00 2-wire vibration transmitter or a velocity sensor such as the Bently Nevada 330500 Velomitor.

Seven Star LLC supports these users with model selection and sourcing support from Muscat. For assets where cabling is difficult, we also supply wireless options such as the Ranger Pro wireless vibration sensor, helping customers in Oman and the GCC combine wired Bently Nevada 177230 transmitters and wireless sensors in one monitoring strategy.

Technical Specifications

The Bently Nevada 177230 data below is taken from Baker Hughes datasheet 177232; confirm values against the current revision before ordering.

How to Order

Send your formal RFQ for the Bently Nevada 177230 to Seven Star LLC with the full part number or the required range, frequency option, approvals and cable length. Our instrumentation division in Muscat will confirm the configuration, coordinate delivery across Oman and the GCC, and provide the Baker Hughes datasheet available for download on this page. Contact our engineering team for help applying the Bently Nevada 177230 to your machinery.