Bently Nevada 990-04-70-01-00 Vibration Transmitter

FAQ

Q1: What is the purpose of the 990 Vibration Transmitter?
A1: It converts vibration signals from a proximity probe into a standard 4–20 mA output for use in control systems of compressors, pumps, motors, or fans.

Q2: What kind of probe does the transmitter use?
A2: It is designed for use with the 3300 NSv non-contacting proximity probe and matching extension cable.

Q3: Can the transmitter be used for dynamic diagnostics?
A3: No. It is intended for general vibration trending. For dynamic diagnostics, a full monitoring system like Bently Nevada System 1 is recommended.

Q4: What output is provided for machinery diagnostics?
A4: The “PROX OUT” terminal offers a non-isolated dynamic signal suitable for battery-powered or isolated test instruments.

Q5: How can the output signal be tested?
A5: There is a dedicated TEST input pin for injecting a test signal using a function generator.

Q6: What happens when the proximity probe fails?
A6: A Not OK/Signal Defeat circuit forces the output below 3.6 mA within 100 µs to avoid false alarms.

Q7: Is there protection against power-up transients?
A7: Yes. Upon startup, the transmitter holds the output below 3.6 mA for 2 to 3 seconds to indicate initialization.

Q8: Can I use the transmitter in hazardous areas?
A8: Yes. It is certified for use in ATEX Zone 0/2 and CSA Class I Div 2 hazardous environments.

990-04-70-01-00 Bently Nevada Vibration Transmitter

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