Bently Nevada 991-01-XX-01-CN 991 Thrust Transmitter

SKU 991-01-XX-01-CN

Disponibile

12-month warranty
Free returns within 30 days

Manufacturer: Bently Nevada
Product No.: 991-01-XX-01-CN
Origin United States
Product Type: Thrust Transmitter
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 0.46 kg
Dimensions: 10cm x 7.3cm x 6cm
Shipping port: Xiamen
Warranty: 12 months

Product Description

Description

The Bently Nevada 991-01-XX-01-CN is a loop-powered, 2-wire industrial instrumentation 991 thrust transmitter engineered for standalone machine protection on tight installation skids. This field-rugged instrument integrates the capabilities of a proximity sensor conditioner and a processing circuit into a single solid-state module, converting dynamic probe inputs directly into a standard 4-20 mA analog current loop output proportional to overall linear shaft position or axial thrust displacement. The 991-01-XX-01-CN connects with a non-contacting proximity transducer assembly to track continuous rotor movement relative to fluid-filmed thrust bearing collars. By routing the current loop directly into programmable logic controllers (PLCs), distributed control systems (DCSs), or SCADA blocks, it provides automatic machine trip protection without requiring a separate intermediate Proximitor sensor housing. The module features an independent buffered voltage terminal to stream unconditioned transducer waveforms directly to portable analyzer tools, a compact rail-ready physical profile, and dedicated market-specific certification codes for international industrial installation areas.

Features

Complete integrated 2-wire architecture delivering a direct 4-20 mA analog current loop for axial thrust displacement tracking.
Independent front-facing buffered voltage terminal providing clean raw proximity waveforms for direct analyzer tool hookup.
Wide input supply flexibility drawing power straight from standard 24 VDC external analog control loops.
Solid-state potted module construction providing high physical insulation and high reliability within confined panel spaces.
Streamlined system footprint eliminating intermediate signal conditioners for space-restricted machinery skids.

Applications

Continuous axial position and thrust bearing wear monitoring on high-pressure centrifugal gas compressors.
Standalone rotor displacement safety loops on industrial process pumps, cooling water fans, and large blowers.
Predictive maintenance and automatic over-travel protection across steam or gas power generation turbines.

Ordering Information

Detail	Product Ordering Reference
Base Model Designation	991 (Thrust Transmitter)
Full Module Part Code	991-01-XX-01-CN
Full Option Suffix Block	-01 (Full-Scale Range Option Suffix)
	-XX (Variable Options Selection Suffix)
	-01 (Mounting Hardware Base Option)
	-CN (Regional Specific Certification / Approval Suffix)

Technical Specifications

Parameter	Detail
Manufacturer	Bently Nevada (Baker Hughes)
Model Designation	991-01-XX-01-CN
Transmitter Product Type	2-Wire Proximity Thrust / Axial Position Transmitter
Electrical Circuit Profile	Loop-powered 2-wire current loop
Analog Output Signal	4-20 mA DC proportional to linear axial displacement
Dynamic Diagnostic Port	Buffered voltage output terminal for local analyzer plug-in
System Power Input Range	Nominal 24 VDC external supply loop
Transducer Input Compatibility	Non-contacting proximity transducer probe assembly
Chassis Assembly Suffix	CN Certified Configuration Variant
Mounting Envelope Selection	01 Mounting Configuration
Chassis Mechanical Envelope	Corrosion-resistant anodized housing with integrated terminal blocks
Hardware Core Dimensions	Low-profile compact footprint optimized for high-density side-by-side rail mounting
Operational Weight Reference	Industrial standard field transmitter assembly weight

Connections/Interfaces

Terminal Point Designation	Terminal Function Assignment
+ / Loop	Positive DC Loop Voltage Input Supply / Signal Connection
- / Return	Negative Return / Current Loop Signal Output Connection
BUF / Dynamic	Dynamic Raw Voltage Output Signal Point (For portable vibration/position meters)
COM / Ground	Common Circuit Ground reference terminal line
Probe Input	Dedicated connection terminal block input for external proximity probe lead

Installation Guidelines

Surface Panel Mounting: Secure the transmitter baseplate firmly against a flat, unpainted, vibration-isolated instrument rail inside a local electrical junction box. Ensure solid physical contact to establish a proper chassis ground.
Proximity Probe Interconnection: Route the proximity transducer coaxial lead wire straight into the designated probe input terminal blocks. Keep these high-impedance input lines separate from heavy industrial motor supply lines to reduce noise coupling.
Current Loop Sizing: Verify total circuit loop resistance values and current loop supply capacities before activating the 24 VDC loop network to prevent voltage drops or components straining.
Diagnostic Port Upkeep: Keep the buffered voltage output terminals clear of conductive dust and moisture when diagnostic testing tools are not connected to protect internal analyzer contacts from atmospheric degradation.

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What primary mechanical parameter does this 991 transmitter measure compared to a 990 module?

The 991 transmitter is calibrated specifically to process linear axial displacement or thrust position measurements, whereas a 990 module is designed to monitor dynamic radial vibration waveforms.

Is an external Proximitor sensor housing necessary to modulate the probe signal into the loop?

No. The transmitter features built-in signal conditioning circuitry that reads the raw proximity probe input and scales it directly into a standard 4-20 mA output loop, removing the need for a separate Proximitor box.

What function does the 'BUF' terminal perform during regular operational monitoring?

The 'BUF' terminal outputs an unconditioned, raw voltage signal from the proximity probe, giving maintenance engineers a safe interface to attach portable test instruments without disrupting the main 4-20 mA control loop.

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