Bently Nevada 990-05-70-01-01 Vibration Transmitter The Bently Nevada 990-05-70-01-01, also cataloged as the 990 Vibration Transmitter, operates as a dedicated...
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The Bently Nevada 990-05-70-01-01, also cataloged as the 990 Vibration Transmitter, operates as a dedicated hardware component for transforming proximity probe signals into a proportional 4-20 mA current loop within machinery protection and TSI platforms.
Hardware Specifications
Parameter
Specification
Model
990-05-70-01-01
Brand
Bently Nevada
Product Type
Vibration Transmitter
Core Performance Index
0 to 5 mils pp (0 to 125 um pp)
System Cable Length
7.0 metres (23.0 feet)
Mounting Options
35 mm DIN rail clips
Agency Approvals
CSA Division 2
Power Supply Input
+12 to +35 VDC at transmitter terminal
Maximum Loop Resistance
1,000 ohm including cable at 35 VDC
Current Limiting
23 mA typical
Origin
USA
Shipment Location
Xiamen, China
Weight
0.5 kg
Dimensions
7.6 cm x 10.2 cm x 5.1 cm
Rotor Dynamics and Gap Voltage Validation
The transmitter integrates directly with eddy-current proximity probes to capture dynamic shaft motion. Accurate monitoring requires strict gap voltage validation, where a baseline -10 VDC target alignment typically corresponds to the linear mid-point of the proximity sensor transducer system. Proper calibration across this curve eliminates cross-talk suppression issues and ensures precise lateral rotor dynamics tracking without signal clipping or saturation within the loop interface.
Frequently Asked Questions
Q: How does the transmitter handle sensor or cable failure within the loop?
A: The device limits its output current to a typical peak of 23 mA under fault or over-range conditions, preventing downstream loop overload.
Q: Can this device be integrated directly into a standard 4-20 mA DCS or PLC input card?
A: Yes, the loop-powered design outputs a linear 4-20 mA signal proportional to the configured 0 to 5 mils pp full-scale range, provided the loop resistance does not exceed 1,000 ohm at 35 VDC.
Field Installation Guidelines
Ensure the unit is securely clipped to a standard 35 mm DIN rail to prevent mechanical vibration from loosening electrical terminal connections.
Maintain proper shielding termination for the probe extension cable to suppress electromagnetic interference and signal degradation.
Verify that the input supply voltage stays within the +12 to +35 VDC threshold directly at the transmitter terminals under maximum loop current load.
