Bently Nevada 990-04-50-01-CN Vibration Transmitter
Bently Nevada 990-04-50-01-CN Vibration Transmitter
The Bently Nevada 990-04-50-01-CN is a two-wire vibration transmitter designed to convert shaft vibration measurements into a standard 4-20 mA process signal. This configuration is engineered for use with a 3300 NSv proximity probe system and incorporates Proximitor sensor functionality within the transmitter, providing a compact solution for machinery vibration monitoring and control applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 990-04-50-01-CN |
| Brand | Bently Nevada |
| Product Type | Vibration Transmitter |
| Measurement Range | 0-100 µm peak-to-peak (0-4 mils pp) |
| System Length | 5.0 m (16.4 ft) |
| Input Signal | 3300 NSv proximity probe and extension cable |
| Output Signal | 4-20 mAdc current loop |
| Supply Voltage | 12-35 VDC |
| Mounting Method | 35 mm DIN rail |
| Operating Temperature | -35 deg C to +85 deg C |
Measurement and Signal Conversion
The transmitter accepts the dynamic signal from a compatible 3300 NSv proximity transducer system and converts the measured shaft vibration into a proportional 4-20 mA output. This output can be connected directly to PLC, DCS, SCADA, or other monitoring systems that support standard analog current loop inputs.
The configured measurement span of 0-100 µm peak-to-peak corresponds to the full-scale output range, allowing vibration levels to be represented as a linear process variable for trending, alarming, and machine condition assessment.
Integrated Proximitor Function
Unlike systems requiring a separate Proximitor module, the 990 series transmitter incorporates the necessary signal conditioning electronics within the transmitter assembly. This integrated architecture reduces installation complexity while maintaining compatibility with the specified 3300 NSv probe system.
A non-isolated PROX OUT connection is provided for diagnostic and signal verification purposes, allowing maintenance personnel to access the conditioned proximity signal during commissioning and troubleshooting.
Installation and Configuration
The transmitter mounts directly onto a standard 35 mm DIN rail, supporting installation within control cabinets and machinery monitoring panels. The two-wire design combines loop-powered operation and signal transmission through the same wiring pair, simplifying field connections.
Independent Zero and Span adjustment controls are provided, enabling calibration without interaction between settings. This arrangement allows technicians to fine-tune output scaling during setup or maintenance activities.
Environmental Performance
The transmitter utilizes a fully potted construction that protects internal electronics from moisture ingress and contamination. This design supports operation in high-humidity environments and in locations where 100% condensing conditions may occur.
The specified operating temperature range of -35 deg C to +85 deg C allows the device to be installed in a wide variety of industrial monitoring applications where ambient conditions may fluctuate significantly.
Frequently Asked Questions
Q: What probe system is required for the 990-04-50-01-CN?
A: This model is designed to operate with a Bently Nevada 3300 NSv proximity probe and the corresponding extension cable configured for a 5.0 m system length.
Q: What does the 4-20 mA output represent?
A: The output is proportional to shaft vibration over the configured measurement range of 0-100 µm peak-to-peak. A receiving control system can scale the current signal into engineering units for monitoring and alarm functions.
Q: Can the transmitter be mounted inside a control cabinet?
A: Yes. The unit is designed for installation on a standard 35 mm DIN rail, making it suitable for control panels, monitoring cabinets, and machinery protection system enclosures.
Bently Nevada 990-04-50-01-CN Vibration Transmitter
