Product Overview
When machinery reliability is critical, the Bently Nevada 181M6049 Dual Output Sensor provides essential vibration and temperature data. This sensor combines a piezoelectric accelerometer with a temperature sensor in a single, rugged package. It delivers dynamic vibration measurements and temperature readings, helping operators detect developing faults before they cause unplanned downtime.
Technical Specifications Breakdown
The 181M6049 offers a dynamic sensitivity of 100 mV/g ±5% at 25°C, with an acceleration range of 60 g peak. Amplitude nonlinearity remains within 1%. Frequency response covers ±5% from 3 to 5,000 Hz, ±10% from 1 to 7,000 Hz, and ±3 dB from 0.5 to 12,000 Hz. Resonant frequency reaches 30 kHz. Transverse sensitivity is ±5% of axial maximum. Temperature response shows -10% at -50°C and +10% at +120°C. The temperature sensor outputs 10 mV/°C and measures from 2° to 120°C.
Electrical requirements include a voltage source of 18-28 Vdc and a current regulating diode of 2-10 mA. Broadband electrical noise is 700 µg from 2.5 Hz to 25 kHz. Spectral noise measures 10 μg/√Hz at 10 Hz, 5 μg/√Hz at 100 Hz, and 5 μg/√Hz at 1000 Hz. Output impedance is 100 Ω maximum, and bias output voltage is 12 Vdc. The case is isolated and internally shielded.
Environmental limits span -50°C to +120°C. Vibration limit is 500 g peak, shock limit is 5,000 g peak. Electromagnetic sensitivity is 70 μg/gauss maximum. Hermetic sealing protects internal components. Base strain sensitivity is 0.0002 g/μstrain maximum. The sensing element uses PZT ceramic in a shear design. Weight is 90 grams. Case material is 316L stainless steel. Mounting uses a ¼-28 UNF tapped hole. The connector is a 3-pin MIL-C-5015 style. Recommended cabling includes 16925-XX without armor and 16710-XX with armor.
Industry Applications
In rotating machinery such as turbines, compressors, and pumps, the 181M6049 monitors bearing vibrations and casing temperatures. Its wide frequency response captures both low-speed and high-speed events. The integrated temperature sensor tracks thermal trends, enabling predictive maintenance. For example, in a refinery, this sensor can detect early signs of bearing wear or imbalance, allowing scheduled repairs instead of emergency shutdowns.
Installation & Setup Guidance
Mount the sensor using the ¼-28 UNF tapped hole on a clean, flat surface. Ensure proper torque per manufacturer specifications. Connect the 3-pin MIL-C-5015 connector to the recommended cabling: 16925-XX without armor or 16710-XX with armor. Verify the voltage source supplies 18-28 Vdc and the current regulating diode operates within 2-10 mA. Isolate the case from ground as it is internally shielded. Bias output voltage should read 12 Vdc. Perform a baseline measurement to confirm sensor functionality.
Maintenance & Reliability
Periodically inspect the sensor and cabling for damage. Verify connector integrity and sealing. The hermetic design protects against moisture and contaminants. Monitor bias voltage and noise levels during routine checks. Replace cabling if armor shows wear. Regular calibration checks ensure accuracy. Following these steps extends sensor life and maintains reliable data.
Compatibility & Integration
The 181M6049 interfaces with Bently Nevada monitoring systems that accept dynamic accelerometer signals and temperature sensor inputs. The dual output simplifies wiring by combining both signals. Ensure the monitoring system supports the 100 mV/g sensitivity and temperature sensor output of 10 mV/°C. Compatible cabling options are 16925-XX without armor and 16710-XX with armor.
Selection Guide & Purchasing Advice
Before purchasing, verify the 181M6049 matches your application requirements. Confirm the mounting thread (¼-28 UNF) and connector type (3-pin MIL-C-5015). Choose the appropriate cabling based on environmental conditions. SpareTechPLC stocks this sensor and can assist with availability and replacement options. Contact our team for current lifecycle status and ordering details.
