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Bently Nevada 3500/46M 176449-06 Hydro Monitor

Configured for hydro turbine shaft position and vibration signal monitoring in the Bently Nevada 3500 Machinery Protection System, the Bently Nevada 3500/46M 176449-06 (176449-06 Hydro Monitor) provides direct physical/electrical execution for hydro machinery monitoring channels.

Hardware Specifications

Parameter	Specification
Model	3500/46M 176449-06
Brand	Bently Nevada
Product Type	Hydro Monitor
Origin	USA
Weight	0.8 kg
Dimensions	2.6 cm x 25.8 cm x 24 cm
Operating Temp	-40 deg C to +85 deg C
Humidity	0-95% RH, non-condensing
Power Consumption	7.7 watts, typical
Input Signal	4-20 mA, 0-10 VDC pressure transmitters
Contact Rating	5 A @ 30 VDC / 250 VAC
Rotor Speed Range	25 to 1,500 cpm
Multimode Positive Input Impedance	50 kOhm
Direct Filter Range	0.104 Hz to 500 Hz
Direct Filter -3 dB Point	1.2 Hz
Gap Filter -3 dB Point	0.05 Hz

Rotor Dynamics and Probe Signal Processing

The 3500/46M Hydro Monitor processes input signals associated with hydro machinery position and vibration measurements. The module supports Bently Nevada TSI monitoring principles by applying signal conditioning methods for rotating equipment analysis.

The module can interface with displacement and process measurement signals while maintaining measurement stability through configured filtering functions. Eddy-current probe scaling and gap voltage validation methods support accurate shaft position evaluation when compatible transducer systems are installed.

The monitor design considers rotor dynamics parameters, including rotational speed range and low-frequency measurement behavior. Signal processing paths include filtering functions to reduce unwanted vibration components and improve channel measurement consistency.

Frequently Asked Questions

Q: What input signal types does the 3500/46M 176449-06 accept?
A: The module accepts 4-20 mA and 0-10 VDC transmitter inputs for hydro monitoring measurement applications.

Q: What filtering functions are available in this Hydro Monitor?
A: The module provides direct filtering from 0.104 Hz to 500 Hz and includes a gap filter with a -3 dB point at 0.05 Hz.

Q: What operating conditions are specified for this module?
A: The module operates from -40 deg C to +85 deg C and supports 0-95% RH non-condensing humidity conditions.

Field Installation Guidelines

Install the 3500/46M module in the designated Bently Nevada 3500 rack slot according to system configuration requirements.

Verify field wiring polarity before connecting pressure transmitters or voltage signal sources. Use shielded cables for low-level measurement signals and connect cable shields according to the site grounding practice to reduce electrical interference.

Keep measurement signal wiring separated from high-voltage power cables and switching circuits. Confirm configured channel parameters, filter settings, and input scaling before placing the monitoring channel into service.

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