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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 990 transmitter provides the following notable features:

Integrated Proximitor Sensor requires no external unit

Non-isolated "PROX OUT" and "COM" terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics‡.

Non-interacting zero and span potentiometers under the Transmitter label support loop adjustment.

Test Input pin for quick verification of loop signal output, using a function generator as the input.

A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection.

Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting.

Potted construction for high humidity (up to 100% condensing) environments.

Compatibility with 3300 NSv proximity probe allows transducer installation in small areas with minimal clearance, typical of centrifugal air compressors.

Frequently Asked Questions

Q1: What is the Bently Nevada 990-05-50-03-00 Vibration Transmitter used for?

A1: The Bently Nevada 990-05-50-03-00 Vibration Transmitter is designed to convert shaft vibration measurements into a standard 4–20 mA output signal for continuous machinery monitoring.  

Q2: What is the frequency response of the 990-05-50-03-00 transmitter?

A2: The 990-05-50-03-00 transmitter provides a frequency response of 5 Hz to 6,000 Hz (+0, -3 dB), allowing accurate detection of vibration across a wide range of rotating machinery applications.

Q3: What is the 990-05-50-03-00 operating temperature range?

A3: The 990-05-50-03-00 transmitter operates reliably within a temperature range of -35°C to +85°C (-31°F to +185°F), making it suitable for demanding industrial environments.

Q4: What power supply is required?

A4: The 990-05-50-03-00 requires a +12 VDC to +35 VDC power supply for proper operation and stable signal output.

Product Applications

Air separation plants/air separation workshops: Used for shaft vibration monitoring of centrifugal air compressors to prevent impeller damage.

Petrochemical and oil refineries: Used for continuous status monitoring of small and medium-sized pumps, fans, and various motors.

Power plants (conventional and self-owned): Monitors the vibration amplitude of auxiliary rotating machinery such as forced draft fans, induced draft fans, and circulating water pumps.

Water treatment and wastewater treatment plants: Ensures safe operation of large high-pressure water pumps and booster pumps.