Bently Nevada 9200-02-01-10-00 Seismic Velocity Sensor

The Bently Nevada 9200-02-01-10-00 is a passive seismic velocity transducer (sometimes called a geophone) designed for permanent installation on rotating machinery to measure absolute casing or bearing housing vibration. It outputs a voltage proportional to the velocity of vibration, typically used for monitoring pumps, compressors, fans, and turbines.

Electrical and Output Specifications

Sensitivity: 100 mV/in/s (3.94 mV/mm/s) ±5% at 100 Hz. Frequency response: 4.5 Hz to 5 kHz (±3 dB). Transverse sensitivity:<5%. Output impedance: 1.8 kΩ typical. The sensor is self-generating (no external power required); it produces an AC signal proportional to vibration velocity. A two-wire shielded cable (Belden 8760 or equivalent) carries the signal to a monitor such as Bently Nevada 1900/65 or 3500 series.

Mechanical and Environmental

Housing material: 304 stainless steel. Mounting thread: 1/4-28 UNF female (for stud mounting). Dimensions: 1.38 inch (35 mm) diameter, 2.25 inch (57 mm) height. Weight: 6 oz (170 g). Operating temperature: -30°C to +120°C. Sealing: Hermetically sealed, IP68. The sensor is radiation resistant to 10^6 Rad (Gamma). Maximum shock: 100 g peak. Corrosion resistant for offshore or chemical plant environments.

Mounting and Installation

The sensor is designed for stud mounting directly onto the machine housing using a 1/4-28 stud (not included). A mounting pad with a flat, machined surface (16 microinches or better) is recommended. The recommended torque: 60-80 in-lbs. For horizontal or vertical mounting orientation, the sensor’s internal mass is tuned for gravity; the part number 9200-02-01-10-00 is version with standard orientation (axial sensitivity). The cable length (standard 10 ft, 3 m) is integral and terminated with pigtail leads.

Compatibility and Applications

This sensor directly replaces older 9200 series probes and works with Bently Nevada monitors and third-party vibration monitors (e.g., 4-20 mA transmitters that accept velocity signals). Typical machinery: centrifugal pumps, cooling tower fans, gearboxes, and small steam turbines. The 100 mV/in/s sensitivity provides a typical full scale of 0-2 in/s (0-50 mm/s) when paired with a monitor set to 0-10 V DC output.

Maintenance and Calibration

The sensor has no moving electrical parts (coil/magnet) and requires no periodic calibration, but a functional check using a portable shaker table (e.g., Bently Nevada TK-3) is recommended every 2 years. The cable is integral; damage to cable requires replacement of the entire sensor. The sensor is not repairable; field replacement of the connector is not allowed.