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Description：

The 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal aircompressors or small pumps, motors, or fans who prefer toprovide 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 thataccepts input from our 3300 NSv proximity probe and itsmatching extension cable (available in 5 m and7 m systemlength options).

The transmitter conditions the signal into appropriate peak- to-peak vibration amplitude engineering units, and providesthis value as a proportional 4 to 20 mA industry-standardsignal as the input to the control system where machinery protection alarming and logic occurs.1

Specification：

Frequently asked questions

1.Why does the 990-05-XX-01-00 output drop below 4 mA when turned on?

An integrated Power-up Inhibit circuit intentionally clamps output under 3.6 mA for 2 to 3 seconds to clear power transients.

2.Can the field output scale be adjusted?

Yes, non-interacting zero and span potentiometers are accessible directly underneath the faceplate label.

3.Which sensor options match this transmitter?

It is engineered exclusively to work with a 3300 NSv proximity probe and matching extension cable.

4.What are the supported physical system lengths?

The primary matching configurations are tuned for either 5.0-meter or 7.0-meter overall cable lengths.

Product Applications

Oil & Gas: Widely used in refineries, natural gas pipelines, and liquefied natural gas (LNG) plants to monitor shaft vibration in critical transfer pumps and small to medium-sized compressors.

Power Generation: Used in power plants to monitor non-contact bearing vibration in peripheral rotating equipment such as small to medium-sized steam turbines, water turbines, auxiliary feedwater pumps, and forced draft fans.

Chemical & Petrochemical: Monitors axial or radial vibration in reactor agitators, large industrial fans, and chemical process pumps to prevent mechanical failures leading to hazardous media leaks.

Air Separation & Compressors: The "990 Vibration Transmitter" is primarily targeted at original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, and fans to meet system integration needs.

Water Treatment & Heavy Industry: Monitors large water pumps, wastewater treatment agitators, and large fan systems in steel mills and cement plants.