Product Description

The Bently Nevada 74712 Seismoprobe® Velocity Transducer provides accurate absolute vibration measurements for bearing housings, casings, and structural components. It uses a moving-coil sensing element, which offers stable low-frequency performance and reduced sensitivity to impacts. Moreover, the self-generating design eliminates the need for external power, making the device ideal for portable vibration analysis or permanent monitoring systems.

This sensor delivers a voltage output directly proportional to vibration velocity, giving maintenance teams a reliable way to detect unbalance, looseness, misalignment, and structural resonance. In addition, its robust, contamination-resistant design ensures dependable operation in challenging process environments including oil and gas, power generation, and heavy industrial facilities.

Because the 74712 belongs to the widely trusted Seismoprobe family, it integrates easily with existing Bently Nevada monitoring hardware. Therefore, it supports both field troubleshooting and long-term condition monitoring programs for critical rotating machinery.

Technical Specifications

Model Number: 74712
Type: Seismoprobe® Velocity Transducer
Measurement Principle: Moving-coil velocity sensor
Sensitivity: 50 mV/in/sec (±5%)
Frequency Response: 10 Hz to 1,000 Hz (±5%)
Dynamic Range: Up to 50 in/sec peak
Linearity: ±2% across full measurement range
Power Requirement: None
Output Signal: Voltage proportional to vibration velocity
Operating Temperature: –30 °C to +120 °C
High-Temperature Option: Available
Mounting Style: Stud-mount to bearing housings or machine casings
Weight: 450 g
Environmental Resistance: Oil-resistant, industrial-grade enclosure
Country of Origin: USA

FAQ

Q1: Does the 74712 require an external power source?
No, the moving-coil design is self-generating and operates without external power.

Q2: Is this sensor suitable for low-frequency vibration monitoring?
Yes, its moving-coil principle delivers excellent stability for low-frequency measurements.

Q3: Can it replace accelerometer-based velocity probes?
Yes, and it performs better in applications where shock sensitivity is a concern.

Q4: Does Bently Nevada offer a high-temperature version?
Yes, several 74712 variants support elevated temperature environments.

Q5: What mounting method is recommended?
A threaded stud mount ensures proper mechanical coupling for accurate readings.