Product Overview
When rotating machinery experiences excessive vibration, unplanned downtime and costly repairs follow. The Bently Nevada 177230-01-01-CN Seismic Transmitter provides a reliable solution by converting vibration velocity into a standard 4-20 mA current loop signal. This rugged transmitter is designed for continuous monitoring in harsh industrial environments, enabling early detection of bearing wear, imbalance, and misalignment.
Technical Specifications Breakdown
The 177230-01-01-CN offers a measurement range of 0 – 25.4 mm/s (0 – 1.0 in/s) RMS, covering the most common vibration levels in industrial machinery. Its frequency response spans 10 Hz to 1 kHz (600 to 60 kcpm) ±10%, ensuring accurate detection of both low-speed and high-speed faults. The output signal is proportional to RMS vibration, providing a stable, noise-immune reading.
Key electrical specifications include an excitation voltage of 12 to 30 Vdc (current limited to 40 mA) and a settling time of less than 15 seconds within 2% of final value. The transmitter is designed for use with PLCs, DCS, and SCADA systems that have internal power supplies typically current limited between 30 mA and 35 mA. The 4-20 mA loop wiring uses Pin A (positive) and Pin B (return), with Pin C providing an unbuffered dynamic acceleration signal referenced to Pin B.
Industry Applications
This seismic transmitter excels in continuous vibration monitoring of pumps, fans, compressors, motors, and turbines. In a petrochemical plant, for example, the 177230-01-01-CN can be mounted on critical centrifugal pumps to detect early bearing degradation before catastrophic failure occurs. Its 316L stainless steel case and hermetically sealed sensor withstand corrosive atmospheres and 100% non-submerged humidity, making it suitable for offshore platforms and chemical processing facilities.
Installation & Setup Guidance
Mount the transmitter using the 1/4-28 UNF mounting hole in the body or the optional M6 x 1 SI or M8 x 1.25 SI threads. Apply a mounting torque of 4 to 7 N-m (35.4 to 62.0 in-lbf) to ensure proper mechanical coupling without over-stressing the sensor. Connect the 3-pin MIL-C-5015 connector per the wiring convention: Pin A to 4-20 mA positive loop, Pin B to loop return, and Pin C for dynamic acceleration signal if needed. Allow the transmitter to settle for at least 15 seconds after power-up before taking readings.
Maintenance & Reliability
The hermetically sealed sensor requires no routine internal maintenance. However, periodic inspection of the connector and cable for damage is recommended, especially in high-vibration or corrosive environments. The transmitter operates reliably from -40°C to +85°C (-40°F to +185°F) and can survive shock drops up to 9.810 m/s² (1.000 g peak). Its transverse sensitivity is less than 5% of sensitivity, minimizing cross-axis errors.
Compatibility & Integration
This transmitter integrates seamlessly with any PLC, DCS, or SCADA system that accepts a standard 4-20 mA input. The dynamic acceleration output (Pin C) provides an additional vibration signal for advanced analysis. The 177230-01-01-CN is part of the Bently Nevada family of condition monitoring solutions, ensuring compatibility with existing Bently Nevada systems and software.
Selection Guide & Purchasing Advice
Before ordering, verify that the measurement range (-AA option 01: 0-25.4 mm/s) and frequency response (-BB option 01: 10 Hz-1 kHz) match your application requirements. Confirm the approval option (CN for country-specific approvals) is appropriate for your region. SpareTechPLC stocks the Bently Nevada 177230-01-01-CN and can provide current availability and lifecycle status. Contact our team to ensure this model meets your specific needs.
Frequently Asked Questions
Q: What is the output signal of the 177230-01-01-CN?
A: The primary output is a 4-20 mA current loop proportional to RMS vibration velocity. Pin C also provides an unbuffered dynamic acceleration signal.
Q: What is the excitation voltage requirement?
A: The transmitter requires 12 to 30 Vdc, current limited to 40 mA. It is designed for use with PLC/DCS/SCADA power supplies that typically limit current to 30-35 mA.
Q: Can this transmitter be used in hazardous areas?
A: The provided data does not include hazardous area certifications. Please verify with SpareTechPLC or consult the manufacturer for specific area classification approvals.
Q: What is the mounting thread size?
A: The mounting hole in the body is 1/4-28 UNF. Optional mounting threads include M6 x 1 SI and M8 x 1.25 SI.
Q: What is the weight of the 177230-01-01-CN?
A: The transmitter weighs 131 g (4.62 oz) typical.
