181M6049 | Bently Nevada Dual Output Sensor 100 mV/g

Introduction to the Bently Nevada 181M6049

When a rotating machine begins to vibrate unexpectedly, the root cause can be elusive. The 181M6049 from Bently Nevada provides a dual output solution, combining accelerometer and temperature sensing in one rugged package. This sensor helps engineers identify issues early, reducing unplanned downtime and maintenance costs.

Designed for harsh industrial environments, the 181M6049 offers a dynamic sensitivity of 100 mV/g and a measurement range of 60 g peak. Its dual output capability allows simultaneous vibration and temperature monitoring, streamlining data collection and analysis.

Key Features and Technical Specifications

• Dynamic sensitivity: 100 mV/g (±5% at 25°C)
• Acceleration range: 60 g peak
• Frequency response: ±5% from 3 to 5,000 Hz
• Frequency response: ±10% from 1 to 7,000 Hz
• Frequency response: ±3 dB from 0.5 to 12,000 Hz
• Resonant frequency: 30 kHz
• Temperature sensor output: 10 mV/°C
• Temperature sensor range: 2° to 120°C
• Voltage source: 18-28 Vdc
• Current regulating diode: 2-10 mA
• Output impedance: 100 Ω max
• Bias output voltage: 12 Vdc
• Case isolated, internally shielded
• Operating temperature: -50°C to +120°C
• Vibration limit: 500 g peak
• Shock limit: 5,000 g peak
• Hermetic sealing
• Weight: 90 grams
• Case material: 316L stainless steel
• Mounting: ¼-28 UNF tapped hole
• Connector: 3-pin MIL-C-5015 style

The 181M6049's temperature sensor output (10 mV/°C) and measurement range (2° to 120°C) enable accurate thermal monitoring, complementing vibration data for a comprehensive machine health picture.

Real-World Applications

In a typical scenario, a plant engineer notices increasing vibration on a critical pump. By installing the 181M6049, they can simultaneously track vibration amplitude and temperature trends. This dual data stream helps differentiate between bearing wear and lubrication issues, enabling targeted maintenance.

The sensor's wide frequency response (up to 12,000 Hz) makes it suitable for monitoring gearboxes, motors, and fans. Its robust construction (316L stainless steel, hermetic sealing) ensures reliable operation in dusty, wet, or corrosive environments.

With a vibration limit of 500 g peak and shock limit of 5,000 g peak, the 181M6049 withstands harsh transient events, reducing sensor failure risk.

Installation and Setup

Mount the 181M6049 using the ¼-28 UNF tapped hole, ensuring a clean and flat surface for optimal coupling. Recommended cabling includes 16925-XX (without armor) or 16710-XX (with armor). The 3-pin MIL-C-5015 connector provides secure connections.

Wire the connector as follows: Shell connects to ground/case; Pin A carries accelerometer power/signal; Pin B is common for accelerometer and temperature sensor; Pin C carries temperature sensor signal. Verify the voltage source (18-28 Vdc) and current regulating diode (2-10 mA) match your system.

Maintenance and Reliability

Regular inspection of the sensor and cabling is recommended. Check for physical damage, loose connections, or contamination. The hermetic seal and stainless steel case minimize environmental wear, ensuring long-term stability.

Because the 181M6049 is designed for continuous operation, periodic verification of its output against a known reference can confirm accuracy. This proactive approach extends sensor life and maintains data integrity.

Compatibility and Integration

The 181M6049 is compatible with Bently Nevada monitoring systems and other data acquisition platforms that accept standard accelerometer inputs. Its dual output (vibration and temperature) can be integrated into existing condition monitoring software for holistic asset management.

For new installations, consult the system integrator to ensure proper signal conditioning and data logging. The sensor's output impedance (100 Ω max) allows for long cable runs without significant signal degradation.

Troubleshooting and Common Issues

If the sensor fails to provide a signal, check the power supply (18-28 Vdc) and the current regulating diode (2-10 mA). Verify the connector pins are clean and properly seated. If temperature readings are erratic, inspect the temperature sensor wiring (Pin C) and ensure the measurement range (2° to 120°C) is not exceeded.

For vibration signal noise, confirm the sensor is securely mounted and the cable is not routed near high-voltage lines. The case-isolated design helps reduce ground loops, but proper grounding of the shell is essential.

FAQ

Q: What is the dynamic sensitivity of the 181M6049?

A: The dynamic sensitivity is 100 mV/g ±5% at 25°C.

Q: What is the temperature sensor measurement range?

A: The temperature sensor measures from 2° to 120°C.

Q: What voltage source does the 181M6049 require?

A: It requires a voltage source of 18-28 Vdc.

Q: What is the frequency response of the 181M6049?

A: The frequency response is ±5% from 3 to 5,000 Hz, ±10% from 1 to 7,000 Hz, and ±3 dB from 0.5 to 12,000 Hz.

Product Support and Availability

The Bently Nevada 181M6049 is available from Petro Auto Tech. Contact our team for current pricing and lead times. We are ready to support your condition monitoring needs.