177230-00-01-CN | Bently Nevada Seismic Transmitter 4-20 mA

Reliable Vibration Monitoring with the Bently Nevada 177230-00-01-CN

When machinery vibration threatens uptime, the 177230-00-01-CN from Bently Nevada provides a dependable solution. This seismic transmitter converts vibration into a standard 4-20 mA current loop, making it easy to integrate with existing PLC, DCS, or SCADA systems. Its robust design and precise output help you detect issues early, reducing costly downtime.

Key Features and Technical Specifications

• Measurement Range: 0 to 12.7 mm/s (0 to 0.5 in/s) RMS, full scale.
• Frequency Response: 10 Hz to 1 kHz (600 to 60 kcpm) ±10%.
• Output Signal: 4-20 mA current loop, proportional to RMS vibration levels.
• Sensitivity: 4 ±0.3 mA equals 0.0 mm/s; 20 ±2 mA equals full scale.
• 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.
• Sensing Element: Ceramic / shear type.
• Case Material: 316L stainless steel, hermetically sealed.
• Connector: 3-pin MIL-C-5015, 316L stainless steel.
• Mounting Hole: 1/4-28 UNF; mounting threads M6 x 1 SI, M8 x 1.25 SI, 1/4-28 UNF.
• Mounting Torque: 4 to 7 N-m (35.4 to 62.0 in-lbf).
• Operating Temperature: -40°C to +85°C (-40°F to +185°F).
• Relative Humidity: Up to 100% non-submerged.
• Weight: 131 g (4.62 oz) typical.

One distinctive spec is the 4-20 mA loop output with a sensitivity of 4 mA at zero and 20 mA at full scale. This allows direct connection to analog input modules without additional signal conditioning, simplifying installation and reducing cost.

Applications and Use Cases

This transmitter is ideal for monitoring rotating equipment such as pumps, fans, compressors, and motors. Its RMS output reflects overall vibration severity, making it suitable for trend monitoring and alarm setpoints. For example, in a continuous process plant, the 177230-00-01-CN can feed vibration data into a DCS, enabling predictive maintenance and preventing unexpected failures.

Installation and Mounting

Mount the transmitter using the 1/4-28 UNF hole or the provided M6/M8 threads. Apply a mounting torque of 4 to 7 N-m (35.4 to 62.0 in-lbf) to ensure proper coupling. Connect Pin A to the positive loop, Pin B to the loop return, and Pin C for the dynamic acceleration signal. The unit is designed for use with PLC, DCS, and SCADA systems that have internal power supplies typically current limited to 30-35 mA.

Maintenance and Reliability

Because the sensor is hermetically sealed and made of 316L stainless steel, it withstands harsh environments, including 100% humidity. Regular inspection per the manufacturer's manual is recommended to verify mounting integrity and cable condition. This low-maintenance design contributes to long service life and reduced total cost of ownership.

Compatibility and Integration

The 4-20 mA output is universally accepted by most industrial control systems, including PLCs, DCSs, and SCADAs. No special interface is needed, making the 177230-00-01-CN a drop-in solution for vibration monitoring upgrades.

Frequently Asked Questions

Q: What is the output signal of the 177230-00-01-CN?

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

Q: What is the measurement range?

A: The full-scale range is 0 to 12.7 mm/s (0 to 0.5 in/s) ±10%.

Q: What is the frequency response?

A: The frequency response is 10 Hz to 1 kHz (600 to 60 kcpm) ±10%.

Q: What power supply is required?

A: Excitation voltage is 12 to 30 Vdc, current limited to 40 mA.

Q: Can it be used in humid environments?

A: Yes, the transmitter operates in relative humidity up to 100% non-submerged.

Product Support and Availability

The Bently Nevada 177230-00-01-CN is available through Petro Auto Tech. Contact our team for current pricing and lead times. We are ready to support your vibration monitoring needs.