Product Description:

The Bently Nevada 990-08-XX-01-00 MOD147202 is a specialized, 2-wire loop-powered vibration transmitter. To interface proximity probe signals directly into PLC or DCS control systems. The "MOD147202" refers to a specific manufacturing modification layer, often standardizing specific full-scale ranges or structural configurations. The 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system. The transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options).

Frequently Asked Questions (FAQ)

Q:How do you properly gap the sensor?

A:To ensure the transmitter tracks vibration linearly across its full scale, the 3300 NSv probe must be physically gapped between 0.5 mm and 1.75 mm away from the target shaft/surface during mechanical installation.
Q:What diagnostic outputs are available?
A:The device features non-isolated PROX OUT and COM terminals alongside a physical coaxial BNC connector. This gives field technicians instant access to raw dynamic vibration data and gap voltage signals using an oscilloscope or machinery analyzer without breaking the primary 4-20 mA control loop

Q:Does it feature false-alarm protection?
A:Yes. The transmitter includes an integrated Not OK / Signal Defeat circuit. If the companion proximity probe suffers a physical failure, short-circuit, or loose terminal connection, the transmitter automatically clamps its output behavior to prevent high current surges and false plant alarms.

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