177230-01-01-CN | Bently Nevada 25.4 mm/s Seismic Transmitter

Introduction: Solving Vibration Monitoring Challenges

When rotating machinery begins to vibrate excessively, unplanned downtime and costly repairs often follow. The 177230-01-01-CN from Bently Nevada provides a dependable solution by converting vibration levels into a standard 4-20 mA signal that control systems can interpret easily. This seismic transmitter is engineered for continuous operation in demanding conditions, helping maintenance teams detect problems early and avoid catastrophic failures.

With a measurement range of 0 to 25.4 mm/s (0 to 1.0 in/s) and a frequency response of 10 Hz to 1 kHz (600 to 60 kcpm), this device covers the most common vibration frequencies found in industrial rotating equipment. Its robust construction and hermetically sealed sensor ensure long-term reliability, even in humid or dusty environments.

Key Features and Technical Specifications

The 177230-01-01-CN offers a set of performance parameters that make it suitable for a wide range of monitoring applications. Below are the essential specifications, all traceable to the manufacturer's datasheet:

• Output Signal: 4 to 20 mA current loop from Pin A to Pin B, proportional to RMS vibration levels.
• Measurement Range: 0 – 25.4 mm/s (0 – 1.0 in/s) with a full-scale accuracy of ±10%.
• Frequency Response: 10 Hz to 1 kHz (600 to 60 kcpm) ±10%.
• 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.
• 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; mounting torque 4 to 7 N-m (35.4 to 62.0 in-lbf).
• Weight: 131 g (4.62 oz), typical.
• Dimensions: Diameter 25.4 mm (1.00 in), height 66.0 mm (2.60 in).

One distinctive feature is the dynamic acceleration signal available on Pin C. This unbuffered signal, referenced to Pin B, allows users to access raw acceleration data for additional analysis, providing deeper insight into machine health beyond the standard 4-20 mA loop.

Applications and Use Cases

The 177230-01-01-CN is designed for use with PLCs, DCS, and SCADA systems that have internal power supplies typically current-limited to 30-35 mA. This makes it an ideal choice for integrating vibration monitoring into existing control architectures. Common applications include:

• Monitoring fans, pumps, and motors in manufacturing plants.
• Tracking vibration on compressors and gearboxes in oil and gas facilities.
• Providing early warning for bearing wear in rotating equipment.
• Supporting predictive maintenance programs in power generation and chemical processing.

By delivering a standardized 4-20 mA signal, this transmitter simplifies wiring and reduces the need for specialized signal conditioning, lowering overall system cost and complexity.

Installation and Setup

Proper installation is critical to achieving accurate measurements. The 177230-01-01-CN features a 1/4-28 UNF mounting hole and also supports M6 x 1 SI and M8 x 1.25 SI mounting threads, offering flexibility for different mounting configurations. Recommended mounting torque is 4 to 7 N-m (35.4 to 62.0 in-lbf) to ensure a secure and stable attachment.

When wiring, connect Pin A to the positive loop and Pin B to the loop return. The dynamic signal on Pin C is referenced to Pin B, so ensure proper grounding to avoid noise. Always follow the manufacturer's installation manual for detailed guidelines.

Maintenance and Reliability

The hermetically sealed sensor and 316L stainless steel case provide excellent protection against moisture and corrosion, making the 177230-01-01-CN suitable for harsh environments. With no moving parts, the transmitter requires minimal maintenance. However, periodic inspection is recommended to verify that the mounting remains tight and the connector is clean and secure.

Given its robust design and wide operating temperature range, this device offers long service life, reducing replacement costs and downtime. For critical applications, consider periodic calibration checks to maintain measurement accuracy.

Compatibility and Integration

Because the output is a standard 4-20 mA loop, the 177230-01-01-CN integrates seamlessly with most PLC, DCS, and SCADA systems. It does not require proprietary communication protocols, simplifying retrofits and new installations. The excitation voltage range of 12 to 30 Vdc ensures compatibility with common industrial power supplies.

Frequently Asked Questions

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

A: The transmitter provides a 4-20 mA current loop output, proportional to RMS vibration levels, with 4 mA representing 0 mm/s and 20 mA representing full scale.

Q: What is the measurement range?

A: The measurement range is 0 to 25.4 mm/s (0 to 1.0 in/s), with a full-scale accuracy of ±10%.

Q: Can this transmitter be used in high-humidity environments?

A: Yes, it is rated for relative humidity up to 100% non-submerged, and the sensor is hermetically sealed.

Q: What is the operating temperature range?

A: The operating temperature range is -40°C to +85°C (-40°F to +185°F).

Q: What mounting options are available?

A: The device has a 1/4-28 UNF mounting hole, and also supports M6 x 1 SI and M8 x 1.25 SI threads. Recommended torque is 4 to 7 N-m.

Product Support and Availability

The 177230-01-01-CN is available through Petro Auto Tech, a trusted supplier of industrial automation parts. Contact Petro Auto Tech to confirm current availability and lead times. Please verify the latest product lifecycle status before ordering.