Vibration Transmitter | 990-04-XX-01-00 | Bently Nevada

Technical Specifications

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). 

Application Scenarios and Target Equipment

Primarily serves OEM manufacturers: centrifugal air compressor, small pump, motor, and fan manufacturers.

Mechanical Protection: Directly sends a 4-20 mA signal to the control system for alarm and interlocking shutdown logic control.

Usage Precautions

False Alarm Prevention Design: The transmitter integrates a Not OK / Signal Defeat circuit. When the sensor cable is broken, short-circuited, or the probe is significantly outside its linear range, the transmitter will limit the current to below 3.6 mA to prevent the PLC from misinterpreting it as a large vibration and causing the machine to trip erroneously.

Loop Calibration: Non-interfering Zero and Span potentiometers are located below the transmitter label, allowing for fine-tuning of the loop output current using a signal generator or micrometer.

Technical FAQ

Q: In 990-04-XX-01-00, what measurement range does “04” lock in?

A: It locks the full-scale measurement range of the transmitter to 0–4 mils pp (0–100 µm pp).

Q: What specific hardware meanings are represented by the “XX” configuration code in 990-04-XX-01-00?

A: Common options include “50” (matching a 5.0 m system total length) and “70” (matching a 7.0 m system total length). The internal circuitry of the transmitter performs linearity compensation based on the selected cable length.

Q: What happens if a 5.0 m probe is connected to a 990-04-70-01-00 (XX=70) system?

A: It will cause system capacitance mismatch, resulting in severe measurement linearity distortion and deviation of the average scale factor (ASF) from the standard value.

Q: What installation structure is defined by “01” in 990-04-XX-01-00?

A: It defines a standard 35 mm DIN rail clip mounting configuration, allowing vertical or horizontal snap-on installation.

Q: Are your products brand new?
A: Yes. We only supply 100% original and brand-new products. All items are sourced through authorized channels and have never been used or refurbished.

Q: Why can customers buy with confidence?
A: Because every product is backed by our 1-Year Warranty Guarantee of Quality, ensuring reliability, customer satisfaction, and long-term support after delivery.

Q: Do you provide international shipping?
A: Yes. We ship products to customers worldwide using reliable international logistics services such as EMS, DHL, UPS, and FedEx.

Trusted by 5,000+ plants worldwide |  Contact for more Bently Nevada spares: sales1@amikon.cn

You May Also Like: