Description

Overview

The Bently Nevada 990‑04‑XX‑01‑05 MOD 165335‑01 vibration transmitter is a modified version of the 990 Series, engineered to convert proximity probe vibration measurements into a standardized 4–20 mA output for direct interface with control and automation systems. Designed for hazardous‑area machinery monitoring, this transmitter integrates the Proximitor® signal conditioning function into a compact, field‑mountable module suitable for compressors, pumps, fans, and other rotating equipment.

Key Characteristics

• Integrated vibration transmitter with built‑in Proximitor® functionality

• Selectable measurement ranges: 0–4 mils pk‑pk or 0–100 µm pk‑pk

• Supports 5 m or 7 m probe/extension cable lengths

• Delivers industry‑standard 4–20 mA proportional vibration output

• Hazardous‑area certified: CSA Div 2, ATEX Zone 0/2, IECEx, ABS marine

• Diagnostic outputs for dynamic vibration and gap voltage

• Zero/span adjustment for field calibration

• Not‑OK/Signal‑Defeat circuitry to prevent false alarms

• DIN‑rail or optional bulkhead mounting

Technical Specifications

Parameter	Specification
Model / Part Number	990‑04‑XX‑01‑05 MOD 165335‑01
Product Type	990 Series Vibration Transmitter
Measurement Range	0–4 mils pk‑pk / 0–100 µm pk‑pk
Output Signal	4–20 mA proportional to vibration amplitude
Frequency Response	Up to 10 kHz
Diagnostic Outputs	PROX OUT terminals + coaxial dynamic output
Cable Compatibility	5 m or 7 m probe/extension cable systems
Certifications	CSA Div 2, ATEX Zone 0/2, IECEx, ABS
Mounting	35 mm DIN rail (standard) or bulkhead
Weight	0.08 kg
Dimensions	116 × 2.5 × 2 cm
System Compatibility	Bently Nevada proximity probe systems
Condition	Brand New
Origin	USA
MOQ	1
HS Code	8537101190

Functional Description

The 990‑04‑XX‑01‑05 MOD 165335‑01 transmitter is designed to simplify vibration monitoring by converting raw proximity probe signals into a 4–20 mA output suitable for PLCs, DCS systems, and SCADA platforms. Its integrated Proximitor® circuitry eliminates the need for separate signal conditioners, reducing installation complexity and panel space requirements.

The module provides two diagnostic outputs:

• Dynamic vibration signal for waveform and spectral analysis

• Gap voltage output for shaft position and probe health verification

The transmitter includes independent zero and span adjustments, enabling precise field calibration without interaction between settings. Its Not‑OK/Signal‑Defeat logic prevents nuisance alarms caused by wiring faults, probe failures, or loose connections.

With multiple hazardous‑area approvals, the transmitter is suitable for offshore platforms, refineries, chemical plants, and marine machinery rooms. Its rugged design ensures stable performance in environments with electrical noise, vibration, and temperature fluctuations.

Application Scenarios

• Compressors and blowers

• Industrial pumps

• Cooling tower fans

• Marine propulsion systems

• Oil & gas rotating equipment

• Machinery located in hazardous or classified areas

FAQ

Q: What is the advantage of the MOD 165335‑01 version?  It incorporates enhanced configuration options and certifications tailored for hazardous‑area and marine applications.

Q: Does this transmitter require an external Proximitor®?  No. The Proximitor® function is built into the module.

Q: Can the transmitter output both 4–20 mA and dynamic vibration signals?  Yes. It provides a 4–20 mA process signal plus separate dynamic and gap outputs.

Specifications

• Dimensions: 116 × 2.5 × 2 cm
• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems