Bently Nevada 990-04-50-01-00

Description

Electrical Specifications

• Power Supply: +12 VDC to +35 VDC loop power supply
• Output Signal: 4–20 mA DC peak-to-peak vibration proportional signal, 2-wire loop configuration
• Loop Accuracy: ±1.5% full scale range
• Maximum Loop Resistance: 1000 Ω (at 35 VDC, including cable resistance)
• Typical Current Limiting: 23 mA
• Fault Alarm Current: <3.6 mA (Not OK signal for probe failure/disconnection)
• Frequency Response: 5 Hz – 6 kHz (+0 / -3 dB)
• Temperature Stability: Scale factor variation ≤±10% within 0 °C to +70 °C
• Sensitivity: 7.87 mV/μm

Probe & Mechanical Specifications

• Compatible Probe: Bently Nevada 3300 NSv proximity probe
• System Total Cable Length: 5.0 meters
• Probe Effective Gap Range: 0.5 mm – 1.75 mm (20–55 mils)
• Minimum Measured Target Diameter: 9.5 mm
• Dynamic Signal Output: Non-isolated PROX OUT & COM terminals + coaxial BNC connector
• Maximum Lead Length to BNC Port: 3 meters

Environmental & Physical Specifications

• Transmitter Operating Temperature: -35 °C to +85 °C
• Transmitter Storage Temperature: -52 °C to +100 °C
• Probe Operating Temperature: -52 °C to +177 °C
• Humidity Resistance: 100% condensing, non-submerged
• Mounting Method: DIN rail mounting (35 mm standard DIN rail)
• Construction: Fully potted sealed structure, high humidity resistance
• Transmitter Weight: 0.43 kg; Total system weight: 0.82 kg typical
• Case Material: Industrial engineering plastic, anti-corrosion and anti-interference

Certification

• CSA/NRTL/C, CE compliance, general industrial safety approval

Core Functional Features

1. Integrated Proximitor Sensor Design

   No external proximitor module required; the transmitter integrates probe excitation, signal conditioning and amplification internally for compact installation.

2. Independent Zero & Span Calibration

   Non-interacting external zero and span potentiometers under the label cover, realize accurate loop signal calibration without mutual interference.

3. Built-in Test Input Interface

   Supports function generator signal injection for fast loop output verification and on-site debugging.

4. Complete Fault Protection Circuit

   Not OK/Signal Defeat circuit automatically detects probe damage, loose connection and cable fault; outputs <3.6 mA alarm current to avoid false high vibration alarms.

5. Startup Inhibit Function

   Prevents abnormal signal output and false alarms during power-on startup.

6. Dual Signal Output Mode

   Primary: 4–20 mA analog signal for system control & alarm; Secondary: dynamic vibration + gap voltage analog signal for advanced diagnosis and analysis.

7. Flexible Installation

   Standard DIN rail mounting, plug-and-play wiring, adapt to compact industrial control cabinet space.

8. High Reliability Sealed Packaging

   Fully potted internal circuit, resist dust, moisture and electromagnetic interference in harsh industrial environments.

Main Application Scenarios

• Centrifugal air compressors
• Industrial water pumps & oil pumps
• Induction motors & high-speed motors
• Industrial fans & blowers
• Petrochemical rotating equipment
• Oil & gas processing machinery
• Wastewater treatment rotating machinery
• Predictive maintenance & machinery health management systems

Configuration Definition of Model 990-04-50-01-00

• 990: Product series (vibration transmitter)
• 04: Standard output type
• 50: 5.0 meters total system cable length
• 01: 35 mm DIN rail mounting
• 00: No additional hazardous area certification