Bently Nevada 990/04-50-01-00 2-Wire Vibration Transmitter

Description

The 990/04-50-01-00 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system.The transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options).The transmitter conditions the signal into appropriate peakto-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurst.

Key specifications of the Bently Nevada 990 Vibration Transmitter include:
Input: Accepts one non-contacting 3300 NSv Proximity Probe and extension cable.
Power: Requires +12 to +35 Vdc input at the transmitter terminal.
Signal Output: Provides a 4-20 mA signal proportional to relative vibration.
Loop Accuracy: Within ±1.5% over the specified full-scale range.
Probe Gap: The probe must be gapped between 0.5 and 1.75 mm from the target to ensure the full scale range.
Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc.
Current Limiting: Typically 23 mA.
Zero and Span: Non-interacting external adjustments allow for loop adjustment.
NOT OK/Signal Defeat: The signal output goes to less than 3.6 mA within 100 μs after a Not OK condition occurs, and is restored within 2-3 seconds after the condition is removed.
Power-up Inhibit: The signal output stays at less than 3.6 mA for 2 to 3 seconds after power is applied.
Proximitor Sensor Output: Compatible with ungrounded, portable test equipment. A test adapter is recommended for signal isolation when using grounded, ac-powered test equipment.
Output Impedance: Prox Out has a 10 kΩ output impedance calibrated for a 10 MΩ load.
Prox Out Linear Range: 1.4 mm, begins at approximately 0.25 mm from the target surface.
Prox Out Incremental Scale Factor: 7.87 mV/μm (200 mV/mil) ± 6.5% typical, including interchangeability errors when measured in increments of 0.25 mm over the linear range using a flat 30 mm target.
Temperature Stability: The incremental scale factor remains within ±10% of 7.87 mV/μm from 0 °C to +70 °C.
Frequency Response: 5 Hz to 6,000 Hz +0, -3 dB.
Minimum Target Size: 9.5 mm diameter.
Leadwire Length: Maximum for Proximitor Sensor Output (BNC connector), maximum cable distance is 3 meters.
Electrical Classification: General Purpose Approval by Canadian Standards Association (CSA/NRTL/C) in North America and by VDE in Europe. The 990 model also has the CE mark for Europe.

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