990-05-70-01-TW 990 Series | Bently Nevada | Vibration Transmitter

Product Description

Configured for radial vibration measurement through a 3300 NSv proximity probe, the Bently Nevada 990-05-70-01-TW (990 Series Vibration Transmitter) converts probe input into a proportional 4-20 mA signal for direct connection to PLC or DCS input circuits. The two-wire loop-powered design integrates the proximity signal conditioning function into the transmitter assembly.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling and Gap Validation

The transmitter accepts the electrical signal from a 3300 NSv eddy-current proximity probe and its associated extension cable. The internal signal-conditioning circuit converts the probe response into a vibration amplitude representation suitable for a 4-20 mA control loop.

During commissioning, technicians should verify the probe gap and signal polarity before applying the vibration measurement loop to a control system. For Bently Nevada eddy-current systems, gap voltage provides a direct indication of probe operating position; a nominal -10 VDC target is commonly used where the applicable probe system specifies this condition. The actual target must follow the installed probe and system documentation.

The 990 Series transmitter measures radial vibration as peak-to-peak amplitude. Therefore, the connected PLC or DCS analog input should be scaled according to the configured 0 to 5 mils peak-to-peak measurement range.

Frequently Asked Questions (FAQ)

Q: What probe does the 990-05-70-01-TW accept?
A: The transmitter accepts one 3300 NSv non-contacting proximity probe with the corresponding extension cable.

Q: What electrical signal does the transmitter provide to the control system?
A: It provides a 4-20 mA output proportional to measured radial vibration amplitude.

Q: Can the transmitter operate without a separate monitor rack?
A: Yes. The two-wire loop-powered transmitter conditions the proximity probe signal internally and provides a direct 4-20 mA interface to compatible PLC or DCS analog input circuits.

Field Installation Guidelines

1. Mount the transmitter using the specified 35 mm DIN rail clips and maintain adequate access for wiring and inspection.
2. Connect the 3300 NSv probe and matching extension cable according to the applicable Bently Nevada wiring configuration.
3. Maintain separation between proximity probe wiring and high-current power conductors to reduce electrical interference.
4. Use appropriate shield termination practices for the installed cable system. Avoid unintended ground loops between the transmitter, probe circuit, and control-system cabinet.
5. Verify the transmitter loop supply remains within the specified +12 to +35 VDC range at the transmitter terminals.
6. Confirm the available loop resistance remains within the 1,000 ohm maximum at the applicable supply voltage.
7. Before connecting the signal to a PLC or DCS input, verify probe gap, polarity, loop continuity, and transmitter output behavior.
8. Use the transmitter test input when performing loop verification with an external signal generator.
9. Verify the PLC or DCS scaling against the configured 0 to 5 mils peak-to-peak measurement range before placing the vibration signal into service.
10. Do not bypass the Not OK or signal-defeat circuitry during normal operation unless the applicable commissioning procedure specifically requires diagnostic testing.

Other Attributes

• Series: 24765 and 135613 Case Expansion Transducer Systems
• Country of Origin: USA
• Lead Time: In Stock, 2 Working Days

In Stock Hot Items of The  Bently Nevada

Our Competitive Brands

• - ABB Advant-800xA，Advant OCS，Bailey Infi 90 and Net 90，H&B Freelance 2000，DSQC Robots，IGCT / IGBT
• - GE General Electric Field Control, Genius I/O, QuickPanel, RX3i PacSystem, Series 90, Series 90, Series VersaMax
• - Allen Bradley Allen-Bradley SLC500, MicroLogix, CompactLogix, ControlLogix, PLC-5, Panel View,
• - Bently Nevada 3300 System, 3500 System
• - Honeywell 7800 Series, FSC, IPC, Mxopen, TDC 2000, TDC 3000, Experion PKS(C200,C300)
• - Yokogawa Centum CS - Centum VP, Centum XL - micro XL, FA-M3, ProSafe-PLC
• - Ovation, Foxboro, EPRO, Emerson DeltaV, Fuji, Siemens, HIMA, Prosoft, Invensys Triconex, ICS TRIPLEX, Woodward, Bachmann, Schneider

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