Vibration Transmitter | 990-10-XX-01-05 MOD:165353-01 | 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). 

Feature

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 supports 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

Protection and Safety Circuit (Not OK Circuit)

Built-in "Not OK" defect protection. When a cable breaks, the probe short-circuits, or the gap is severely exceeded (probe impact or detachment), the transmitter will automatically lock the loop current below 3.6 mA.

The control system (PLC/DCS) will recognize this low current and determine it as a "channel fault," effectively preventing false tripping and shutdown.

Technical FAQ

Q: What is the function of the “TEST” pin on the 990-10-XX-01-05 MOD:165353-01 transmitter panel?

A: It is a test input terminal. Field technicians can inject an AC signal using a function generator to verify 4–20 mA loop accuracy without removing or mechanically moving the probe.

Q: What are the linear measurement range and probe gap requirements for the 990-10-XX-01-05 MOD:165353-01 transmitter?

A: The proximity measurement range is 10–65 mils. The installation gap on AISI 4140 steel should be set between 0.5 mm and 1.75 mm (20–55 mils) to keep the bias in the center of the linear region.

Q: Can the 990-10-XX-01-05 MOD:165353-01 operate in high-temperature or condensation environments?

A: Yes. It uses a potted construction and can withstand up to 100% condensing humidity, provided the coaxial connector is properly sealed and insulated.

Q: How is calibration adjusted during maintenance for the 990-10-XX-01-05 MOD:165353-01 transmitter?

A: It includes independent Zero and Span potentiometers under the nameplate. These allow fine adjustment of the 4–20 mA output without interaction between the two settings.

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

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