177230-00-02-05 | Bently Nevada Seismic Transmitter 0-12.7 mm/s

What Is the Bently Nevada 177230-00-02-05?

The 177230-00-02-05 is a seismic transmitter from Bently Nevada, designed to convert vibration signals into a standard 4-20 mA current loop output. This makes it straightforward to integrate with PLCs, DCS, and SCADA systems that have internal power supplies typically current limited to 30-35 mA. Built in the U.S.A., this transmitter is engineered for reliability in demanding industrial environments.

Its compact form factor—25.4 mm diameter and 66.0 mm height—allows installation in tight spaces. The 316L stainless steel case and connector provide corrosion resistance, while the hermetically sealed sensor ensures long-term stability. With a measurement range of 0 to 12.7 mm/s (0 to 0.5 in/s) and a frequency response of 3 Hz to 1 kHz, it covers common vibration monitoring needs.

Key Features and Technical Specifications

The 177230-00-02-05 offers several features that make it a dependable choice for vibration monitoring. Below are the core specifications extracted from the official datasheet:

• Measurement Range: 0 – 12.7 mm/s (0 – 0.5 in/s) peak
• Frequency Response: 3 Hz to 1 kHz (180 to 60 kcpm) ±10%
• Output Signal: 4-20 mA current loop (Pin A to Pin B)
• Excitation Voltage: 12 to 30 Vdc, current limited to 40 mA
• Settling Time: Less than 15 seconds within 2% of final value
• Mounted Resonant Frequency: Greater than 12 kHz
• Transverse Sensitivity: Less than 5% of sensitivity
• Operating Temperature: -40°C to +85°C (-40°F to +185°F)
• Relative Humidity: Up to 100% non-submerged
• Case Material: 316L stainless steel
• Connector: 3-pin MIL-C-5015, 316L stainless steel
• Mounting Hole: 1/4-28 UNF
• Weight: 0.131 kg (4.62 oz)

One distinctive spec is the transverse sensitivity of less than 5%, which minimizes errors from cross-axis vibrations. This is critical for accurate readings in machinery where vibration may occur in multiple directions.

Applications and Use Cases

The 177230-00-02-05 is ideal for predictive maintenance and condition monitoring in rotating equipment such as pumps, motors, fans, and compressors. Its 4-20 mA output allows direct connection to existing control systems, enabling continuous vibration tracking without additional signal conditioning.

For example, in a manufacturing plant, you can mount this transmitter on a critical pump to monitor vibration levels. The output can trigger alarms when vibration exceeds set thresholds, helping prevent unexpected failures. Because the transmitter is hermetically sealed and rated for 100% relative humidity, it suits washdown areas or humid environments.

Additionally, its multiple approvals (CSA/NRTL/C, ATEX/IECEx) make it suitable for hazardous locations, though you should verify the exact approval rating for your specific area classification.

Installation and Setup

Installing the 177230-00-02-05 is straightforward. The mounting hole is 1/4-28 UNF, and mounting threads include M6 x 1 SI, M8 x 1.25 SI, and ¼-28 UNF. Apply a mounting torque of 4 to 7 N-m (35.4 to 62.0 in-lbf) to ensure a secure fit without damaging the sensor.

Wiring is simple: Pin A connects to the 4-20 mA positive loop, Pin B to the loop return, and Pin C provides a dynamic acceleration signal (unbuffered, referenced to Pin B). Ensure the power supply is current limited to 40 mA, as the transmitter is designed for that range. The settling time is under 15 seconds, so allow a brief warm-up before taking critical readings.

Maintenance and Reliability

Routine maintenance for the 177230-00-02-05 is minimal due to its rugged construction. The 316L stainless steel case resists corrosion, and the hermetic seal protects internal components from moisture and contaminants. Still, periodic inspection is recommended to verify the mounting integrity and check for any physical damage.

Because the transmitter operates over a wide temperature range (-40°C to +85°C), it can be used in harsh environments. The electrical isolation is greater than 10^8 ohms, and the isolation breakdown voltage is 600 Vrms with less than 1 mA leakage current, ensuring safe operation in most industrial settings. Following the manufacturer's manual for periodic checks will help maintain long-term accuracy.

Compatibility and Integration

The 177230-00-02-05 is designed for use with PLCs, DCS, and SCADA systems that have internal power supplies typically current limited to 30-35 mA. Its 4-20 mA output is a universal analog signal, making it compatible with most control systems that accept standard current loops. No special communication protocols are required, simplifying integration.

For dynamic vibration analysis, the unbuffered acceleration signal on Pin C can be connected to a data collector or analyzer. However, ensure that the receiving device is referenced to Pin B as common. This flexibility allows you to use the transmitter for both continuous monitoring and detailed vibration diagnostics.

Buyer's Guide: Evaluating the 177230-00-02-05

When considering the 177230-00-02-05 for your application, evaluate your measurement needs. The 0-12.7 mm/s range is suitable for general machinery vibration, but if you require higher ranges, you may need a different model. The frequency response of 3 Hz to 1 kHz covers most rotational speeds, but verify it matches your machine's operating frequencies.

Check the environmental conditions: the transmitter can handle 100% relative humidity and temperatures from -40°C to +85°C, so it is robust for outdoor or washdown applications. The multiple approvals (CSA/NRTL/C, ATEX/IECEx) indicate suitability for hazardous areas, but confirm the specific zone and gas group with the official documentation.

Finally, consider the mounting requirements. The 1/4-28 UNF hole is common, but ensure your mounting point matches one of the provided thread options (M6, M8, or ¼-28). The weight of 0.131 kg is light enough for most brackets.

Common Questions and Answers

Q: What is the output signal of the 177230-00-02-05?

A: The output is a 4-20 mA current loop from Pin A to Pin B, proportional to peak vibration levels.

Q: What power supply is required?

A: The excitation voltage is 12 to 30 Vdc, with current limited to 40 mA. It is designed for PLC/DCS/SCADA power supplies typically limited to 30-35 mA.

Q: Can the transmitter be used in hazardous areas?

A: Yes, it has multiple approvals including CSA/NRTL/C and ATEX/IECEx, but verify the specific rating for your area.

Q: What is the mounting torque?

A: The recommended mounting torque is 4 to 7 N-m (35.4 to 62.0 in-lbf).

Support and Availability

The 177230-00-02-05 is available through Petro Auto Tech, an industrial automation parts supplier. Contact Petro Auto Tech for current availability and lead times. They can also assist with technical questions about this product.