991-01-XX-01-CN mod 284318-01 Vibration Transmitter

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	991-01-XX-01-CN mod 284318-01
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description

991-01-XX-01-CN mod 284318-01 Vibration Transmitter is a two-wire loop-powered device designed for automation monitoring of compressors, pumps, motors, and fans. 991-01-XX-01-CN mod 284318-01 Vibration Transmitter accepts a 3300 NSv proximity probe and converts shaft vibration within the 25-0-25 mil scale into a proportional 4–20 mA signal for PLC or DCS input cards. The transmitter operates from +12 to +35 Vdc and supports loop resistance up to 1000 Ω, allowing cabinet installation several meters from the machine.

Using the 0.25–1.65 mm Prox Out linear range and 10 kΩ output impedance, 991-01-XX-01-CN mod 284318-01 Vibration Transmitter also provides a BNC diagnostic signal for handheld analyzers. 991-01-XX-01-CN mod 284318-01 Vibration Transmitter mounts on DIN rail clips and works between −35°C and +85°C, making it suitable for field panels. The internal 23 mA limiting circuit protects the control loop while the 7 m system length enables direct machine connection without external signal conditioners.

Applications

Shaft vibration monitoring in centrifugal compressors
In compressor skids, 991-01-XX-01-CN mod 284318-01 Vibration Transmitter receives the signal from a 3300 NSv probe and converts the 25-0-25 mil shaft movement into a 4–20 mA output. The 1000 Ω loop resistance allows wiring directly to PLC analog input cards located in a control cabinet several meters away, while the −35°C to +85°C operating range supports outdoor compressor packages.

Motor bearing movement tracking
For medium-size motors, 991-01-XX-01-CN mod 284318-01 Vibration Transmitter uses the 0.25–1.65 mm Prox Out linear range to follow rotor motion during start and load change. The +12 to +35 Vdc loop power simplifies panel wiring because no external signal conditioner is required, enabling continuous monitoring in MCC cabinets.

Pump protection signal to DCS alarm logic
Installed on process pumps, 991-01-XX-01-CN mod 284318-01 Vibration Transmitter sends proportional vibration current to DCS alarm points. The 23 mA current limiting prevents loop overload when cable faults occur, and the 7 m system length supports probe installation close to the bearing housing while the transmitter remains inside the junction box.

Fan skid condition monitoring
On industrial fans, 991-01-XX-01-CN mod 284318-01 Vibration Transmitter outputs both 4–20 mA and BNC dynamic signal. Operators can connect portable analyzers to the 10 kΩ impedance Prox Out connector to observe waveform amplitude while the control system receives continuous current input.

Specifications

Competitive Advantage

Direct connection to PLC analog cards without signal converter
Because 991-01-XX-01-CN mod 284318-01 Vibration Transmitter outputs a standard 4–20 mA signal and operates from loop power, panels do not require extra interface modules. The 1000 Ω allowable loop resistance supports long cable routing in plant wiring trays.

Provide both current signal and waveform test port
991-01-XX-01-CN mod 284318-01 Vibration Transmitter offers a BNC Prox Out with 10 kΩ impedance. Maintenance staff can attach a handheld vibration meter to view shaft motion while the control system continues receiving the 4–20 mA process signal.

Operate in outdoor cabinets and hot machinery areas
With a −35°C to +85°C operating temperature and DIN rail mounting, 991-01-XX-01-CN mod 284318-01 Vibration Transmitter can be installed inside compressor shelters, fan housings, or pump skids without additional cooling equipment.

Protect the loop from wiring faults
The internal 23 mA current limiting in 991-01-XX-01-CN mod 284318-01 Vibration Transmitter restricts excessive current if a probe cable loosens or shorts. This prevents the analog input module from receiving abnormal high current and keeps the monitoring channel available after maintenance.