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Bently Nevada 121M6469-02 Ranger Pro Wireless Triaxial Vibration and Temperature Sensor

The Bently Nevada 121M6469-02, also cataloged as the 121M6469 Ranger Pro Wireless Triaxial Vibration and Temperature Sensor, operates as a dedicated hardware component for wireless vibration and casing temperature data acquisition within Bently Nevada System 1 condition monitoring networks.

Hardware Specifications

Parameter	Specification
Model	121M6469-02
Brand	Bently Nevada
Origin	USA
Product Type	Wireless Triaxial Vibration and Temperature Sensor
Series	Ranger Pro Wireless Condition Monitoring
Sensor Technology	Piezoelectric ceramic accelerometer with integrated temperature sensor
Measurement Configuration	Triaxial vibration measurement (X, Y, Z axes) with casing temperature monitoring
Wireless Protocol	ISA100.11a / WirelessHART
Wireless Range	Up to 150 m line-of-sight; up to 100 m sensor-to-sensor
Frequency Range	Z-axis: 5 Hz to 10 kHz; X/Y axes: 5 Hz to 4 kHz
Amplitude Range	+/-20 g peak
Accuracy	+/-5% for Z-axis and +/-10% for X/Y axes at 160 Hz
Operating Temp	-40 deg C to +85 deg C
Battery Type	Replaceable 3.6 V lithium-thionyl chloride (Li-SOCl2) D-size battery
Battery Life	Up to 5 years depending on sampling configuration
Power Consumption	Low-power wireless operation with battery supply
Ingress Protection	IP67
Housing Material	316 stainless steel body with glass-reinforced PPS top
Dimensions	Height: 88 mm; Diameter: 40 mm
Weight	Approx. 230 g without battery; approx. 300 g with battery
Mounting Interface	M6 x 1 mm internal thread, 5 mm deep
Hazardous Area Rating	Intrinsically Safe, ATEX/IECEx Zone 0, Class I Division 1

Rotor Dynamics and Vibration Signal Processing

The 121M6469-02 acquires vibration signals from three orthogonal measurement axes and processes velocity, acceleration, timebase waveform, spectrum, and PeakDemod spectrum data. Therefore, the sensor supports mechanical condition evaluation for rotating equipment by identifying vibration changes associated with imbalance, misalignment, bearing degradation, and structural resonance.

Bently Nevada monitoring technology applies rotor dynamics analysis methods to evaluate machine vibration behavior. In addition, the wireless sensor architecture reduces the requirement for permanent cabling while maintaining vibration data availability through System 1 integration.

The sensor design supports measurement consistency by controlling signal interference between measurement channels. Furthermore, triaxial acquisition reduces installation limitations because one sensor can collect directional vibration information from multiple mechanical planes.

Frequently Asked Questions

Q: Does the 121M6469-02 measure vibration and temperature simultaneously?
A: Yes. The sensor integrates a triaxial piezoelectric accelerometer and casing temperature measurement function in one wireless device.

Q: Which wireless communication protocols does the 121M6469-02 support?
A: The device supports ISA100.11a and WirelessHART wireless communication protocols for industrial condition monitoring networks.

Q: What mounting method does the sensor use for mechanical installation?
A: The sensor uses an M6 x 1 mm internal thread with a 5 mm depth mounting interface for direct stud installation.

Field Installation Guidelines

Install the 121M6469-02 directly on the monitored machine casing using a suitable mechanical mounting stud to maintain vibration transmission accuracy. Ensure the mounting surface remains clean, flat, and free from excessive corrosion or contamination.

Avoid installation locations with unnecessary mechanical interference, loose structural components, or external impact sources. Moreover, position the sensor to maintain proper wireless communication paths with the network infrastructure.

For hazardous area installations, verify that the installation location meets the applicable ATEX, IECEx, or Class I Division 1 requirements before commissioning. Follow approved grounding, bonding, and electrical installation practices for the surrounding equipment.

Route the sensor away from strong electromagnetic interference sources when possible. In addition, configure wireless sampling intervals according to required monitoring frequency, battery capacity, and machine operating conditions.

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