Overview
Key Features
- Four-channel position monitoring for configured measurement functions.
- Supports proximity probes, RPT sensors, DC/AC LVDTs, and rotary potentiometers with matching I/O.
- Configures channels 1-2 and 3-4 in functional pairs.
- Provides 4-20 mA recorder outputs, subject to channel-specific exceptions.
- Uses configurable alarm setpoints and alert delays for position monitoring.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/45 176449-04 |
| Brand | Bently Nevada |
| Product Type | Four-Channel Position Monitor |
| Spare Model | 176449-04 |
| Measurement Functions | Thrust position, differential expansion, case expansion, valve position |
| Number of Input Channels | 1 to 4 |
| Function Configuration | Channels 1-2 and 3-4 configured in pairs |
| Input Sensor Families | Proximity, RPT, DC/AC LVDT, rotary potentiometer |
| Typical Power Consumption | 7.7 W with Position I/O; 8.5 W with AC LVDT I/O; 5.6 W with potentiometer I/O |
| Recorder Output | 4-20 mA, subject to Ramp/CIDE channel exceptions |
| Recorder Load | 0-600 ohm |
| Recorder Update Interval | 100 ms or less |
| Direct Filter Response | -3 dB at 1.2 Hz |
| Gap Filter Response | -3 dB at 0.41 Hz |
| Alarm Setpoint Accuracy | Within 0.13% of the desired value |
| Alert Delay | 1-60 s, adjustable in 1 s intervals |
| Rack Location | One full-height front slot |
| Stock Availability | 7 units |
Measurement Configuration
The 3500/45 supports several types of position measurements, but the required configuration depends on the application. Thrust position monitoring measures axial shaft movement, while differential expansion monitoring evaluates relative movement between the rotor and casing. Case expansion and valve position monitoring address other mechanical displacement requirements.
The monitor uses paired channel configuration. Therefore, verify the intended functions for channels 1-2 and 3-4 before selecting the replacement. The sensor type, I/O hardware, sensitivity, and measurement geometry must also match the existing installation.
Signal Processing and Alarm Settings
The monitor provides direct and gap filter responses with different frequency characteristics. These settings affect the frequency content of the measured signal and should be considered when checking the existing monitoring configuration.
The alarm setpoint accuracy is specified as within 0.13% of the desired value. Alert delays can be configured from 1 to 60 seconds in 1-second increments, allowing the alarm response to follow the configured monitoring requirements.
Replacement and Configuration Checks
Before replacing an installed 3500/45 monitor, verify the following:
- Confirm the complete part number, 176449-04, and the intended measurement functions.
- Check that the installed I/O module matches the sensor technology, including the required proximity, RPT, LVDT, or potentiometer interface.
- Confirm the channel-pair configuration and measurement geometry.
- Check recorder output requirements and any applicable Ramp/CIDE channel exceptions.
- Verify the existing alarm setpoints, filter settings, and alert delays before returning the monitoring system to service.
A matching rack slot alone does not establish electrical or functional compatibility.
Frequently Asked Questions
Q: How many measurement channels does the Bently Nevada 3500/45 176449-04 support?
A: It supports up to four input channels. Channel functions are configured in pairs, with channels 1-2 and 3-4 assigned according to the selected measurement requirements.
Q: Can the 3500/45 use different position sensor types?
A: The supported sensor families include proximity probes, RPT sensors, DC/AC LVDTs, and rotary potentiometers. The installed I/O hardware must match the sensor technology and measurement arrangement.
Q: Is the 176449-04 a direct replacement for every 3500/45 installation?
A: No. Confirm the complete part number, I/O module, sensor sensitivity, channel configuration, and measurement geometry before replacement. Matching the rack location does not guarantee electrical compatibility.
Reviews
There are no reviews yet.