990-04-50-01-CN Bently Nevada Transmitter | Datasheet & Technical Manual

990-04-50-01-CN 990 2-Wire Vibration Transmitter | Bently Nevada

990-04-50-01-CN 990 2-Wire Vibration Transmitter | Bently Nevada

Availability: 10 left in stock

The Bently Nevada 990-04-50-01-CN, also cataloged as the 990 2-Wire Vibration Transmitter, operates as a dedicated hardware component for proximity...

SKU: 990-04-50-01-CN

Manufacturer: Bently Nevada
Product No.: 990-04-50-01-CN
Product Type: Vibration Transmitters
Product Origin: USA
Payment:T/T, Western Union
Weight: 1500g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

The Bently Nevada 990-04-50-01-CN, also cataloged as the 990 2-Wire Vibration Transmitter, operates as a dedicated hardware component for proximity probe signal conditioning and 4-20 mA loop current conversion within machinery protection platforms.

Suffix Breakdown & Model Matrix

Option Code	Option Description	Technical Definition
990	Base Model	2-Wire Vibration Transmitter
-04	Full-Scale Option	0 to 100 um peak-to-peak measurement range
-50	System Length Option	5.0 meters (16.4 feet) total system length
-01	Mounting Option	35 mm DIN rail clips installed
-CN	Agency Approval Option	ATEX/IECEx and Chinese NEPSI hazardous area approvals

Hardware Specifications

Parameter	Specification
Model	990-04-50-01-CN
Brand	Bently Nevada
Origin	USA
Product Type	Vibration Transmitters
Measurement Range	0 to 100 um peak-to-peak
System Length	5.0 meters (16.4 feet)
Input Device	Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
Output Signal	4-20 mA loop current proportional to vibration amplitude
Mounting	35 mm DIN rail clips
Agency Approvals	ATEX, IECEx, and NEPSI hazardous area marking
Construction	Potted internal assembly for high-humidity environments
Power Consumption	Loop-powered via output 4-20 mA current loop

Gap Voltage Validation (-10 VDC Targets) & Cross-Talk Suppression

The module conditions raw high-frequency signals from a 3300 NSv proximity probe system across a 5.0-meter system length. Non-isolated PROX OUT and COM terminals deliver direct dynamic vibration and static gap voltage signals, requiring physical probe gap voltage validation to maintain a nominal -10 VDC bias at target center. Integrated potted construction and internal filtering facilitate cross-talk suppression and signal integrity when multiple transmitters are co-located in densely wired instrument enclosures.

Frequently Asked Questions

Q: What mechanisms prevent false alarm tripping during power interruption or probe fault states?

A: The transmitter incorporates a power-up inhibit circuit to block line voltage transient errors during startup, alongside a Not OK/Signal Defeat circuit that clamps high output signals caused by a damaged proximity probe or loose wiring.

Q: How are calibration adjustments performed on the transmitter in the field?

A: Zero and span potentiometers are accessible under the front label, allowing field technicians to calibrate the loop current output directly using the integrated Test Input Pin for verification.

Q: Does the transmitter require a separate external Proximitor Sensor unit?

A: No, the transmitter features an integrated Proximitor Sensor circuit inside a single potted module housing, eliminating the need for an external signal conditioner.

Field Installation Guidelines

Mount the module onto a clean 35 mm DIN rail, confirming secure clip engagement against panel vibration.
Connect the 3300 NSv extension cable to the input connector, ensuring a tight coaxial connection.
Measure static DC voltage at the PROX OUT and COM terminals using a calibrated multimeter, adjusting physical probe depth to achieve the -10 VDC gap voltage target.
Wire the 4-20 mA current loop terminals to the control system analog input card using shielded twisted-pair conductors.
Ground the cable shield at a single point on the main enclosure instrument bus bar to prevent ground loops and electromagnetic interference.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.