990-04-50-01-00 Vibration Transmitter

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	990-04-50-01-00
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

The 990-04-50-01-00 Vibration Transmitter converts input from a 3300 NSv Proximity Probe and its extension cable into a 4–20 mA proportional vibration signal suitable for machinery control systems. Designed for centrifugal air compressors, small pumps, motors, and fans, the 990-04-50-01-00 accepts non-contacting probes with linear ranges from 0.25 to 1.65 mm (10–65 mils) and full-scale vibration measurement of 0–4 mils pp (0–100 μm pp). Its two-wire, loop-powered design operates on +12 to +35 Vdc with a maximum loop resistance of 1,000 Ω and provides a Prox Out signal calibrated for 10 MΩ load. The 990-04-50-01-00 supports a system cable length up to 5.0 meters, mounting via 35 mm DIN rail clips, and operates across -35°C to +85°C (-31°F to +185°F), with storage up to -52°C to +100°C (-62°F to +212°F). Features include integrated Proximitor Sensor, non-interacting zero and span adjustments, test input pin, and Not OK/Signal Defeat circuit. Potted construction ensures operation in high humidity environments, while compact form factor allows installation in tight spaces with minimal clearance.

Applications

Monitor Centrifugal Air Compressors
The 990-04-50-01-00 measures casing vibration using a 3300 NSv Proximity Probe, providing a 4–20 mA signal to detect vibration amplitudes from 0.25 to 1.65 mm (10–65 mils). Its compact 5.0-meter system length fits tight installations.

Vibration Monitoring for Small Pumps and Motors
By converting input from a 3300 NSv probe into a proportional signal, the 990-04-50-01-00 enables operators to monitor vibration in small pumps and motors operating up to 100 rpm, ensuring precise equipment feedback.

Fan Speed and Position Measurement
The 990-04-50-01-00 captures dynamic vibration and gap voltage through Prox Out terminals, supporting fan assemblies on cooling towers and air-cooled heat exchangers, enabling precise speed and position monitoring.

OEM Control System Integration
The 990-04-50-01-00 provides loop-powered 4–20 mA output compatible with existing machinery control systems, making it ideal for OEM integration in centrifugal air compressors and small rotating machinery.

Specifications

Competitive Advantage

Integrated Proximitor Sensor
The 990-04-50-01-00 eliminates the need for an external sensor unit, reducing installation complexity and improving measurement consistency across the loop-powered system.

Non-Interacting Zero and Span Adjustment
Operators can fine-tune the 990-04-50-01-00 output signal using built-in potentiometers without affecting other signal parameters, providing precise calibration in the field.

High Humidity Operation
The 990-04-50-01-00 features potted construction and operates in 100% condensing humidity, allowing use in wet or condensing environments without performance loss.

Compact DIN-Rail Mounting
With 35 mm DIN rail clip mounting and a maximum cable length of 5.0 meters, the 990-04-50-01-00 installs easily in confined spaces while maintaining full 3300 NSv probe performance.

Fault Detection and Signal Defeat Circuit
The 990-04-50-01-00 includes a Not OK/Signal Defeat feature, preventing high outputs or false alarms due to faulty probes or loose connections, improving operational safety and reliability.