350900-315 Bently Nevada Velocity & Acceleration Sensor
Manufacturer: Bently Nevada
Product No.: 350900-315
Condition： In stock
Product Type: Acceleration Sensor
Product Origin: USA
Payment: T/T, Western Union
Weight: 500g
Shipping port: Xiamen
Warranty: 12 months
Estimate delivery times: 12-26 days (International), 3-6 days (United States).
Return within 30 days of purchase. Duties & taxes are non-refundable.
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350900-315 | Bently Nevada 350900 High Temperature Velocity and Acceleration Sensor
The Bently Nevada 350900-315 High Temperature Velocity and Acceleration Sensor (HTVAS) provides two vibration outputs from one sensing assembly: velocity for machinery protection and acceleration for condition diagnostics. Its architecture separates the high-temperature sensing head from the signal-conditioning electronics, allowing the sensing head to operate near hot machinery while the electronics remain in a suitable cooler location.
The 350900 family is designed primarily for use with Bently Nevada 3500/42M and 3500/44M monitors. When both outputs connect to the same monitor, assign them to a separate channel pair, such as channels 1 and 3, or use separate monitors. Confirm the monitor configuration and applicable wiring instructions before commissioning.
Why Choose the 350900 HTVAS?
| Engineering requirement | Sensor capability | Practical value |
|---|---|---|
| Hot machinery surfaces | Sensing head rated up to +482°C (+900°F) | Supports vibration measurement where conventional case-mounted sensors may exceed their temperature limits. |
| Protection and diagnostics | Separate velocity and acceleration outputs | Supports velocity-based monitoring alongside acceleration-based vibration analysis. |
| Reduced connector-related failure exposure | Sensing head and electronics permanently connected through a hardline cable | Eliminates an intermediate connection between these assemblies as a potential failure point. |
| Extended cable runs | Maximum cable length: 305 m (1,000 ft), according to the supplied specifications | Supports remote monitoring installations when the complete cable arrangement meets system requirements. |
| Industrial mounting | Four-hole, square mounting pattern | Allows mounting to a prepared surface with suitable flatness and mechanical rigidity. |
Configuration Breakdown — 350900-315
The part number follows the structure 350900-AAA. The suffix identifies the integral cable length option.
-
350900 — Base model
- High Temperature Velocity and Acceleration Sensor (HTVAS)
- Provides velocity and acceleration outputs.
- Separates the sensing head from its signal-conditioning electronics.
-
315 — Integral Cable Length Option
- Specified length: 315 inches
- Metric equivalent: approximately 8.0 metres
- Identifies the selected integral cable configuration.
Ordering guidance: Verify the complete part number and cable routing requirements before replacing an installed sensor. The 315 suffix specifies the integral cable length; it does not independently confirm monitor compatibility, hazardous-area approval, or the suitability of every mounting arrangement.
Technical Specifications
General and Electrical Characteristics
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 350900-315 |
| Product family | 350900 HTVAS |
| Product type | High Temperature Velocity and Acceleration Sensor |
| Country of manufacture | Made in U.S.A. (as specified) |
| Integral cable length | 315 in (approximately 8.0 m) |
| Power supply | −18 to −30 VDC |
| Power supply for hazardous-area approval options | −18 to −28 VDC; confirm the specific approval option |
| Quiescent current | 6 mA nominal, no load |
| Grounding | Case isolated |
| Transverse sensitivity | Less than 5% of axial sensitivity |
| Amplitude linearity | ±1% to 4,900 m/s² (500 g) peak overall acceleration |
| Mounted resonant frequency | Greater than 15 kHz |
| Maximum cable length | 305 m (1,000 ft), subject to the specified system conditions |
Velocity Output
| Parameter | Specification |
|---|---|
| Sensitivity | 3.94 mV/mm/s (100 mV/in/s) ±5% |
| Frequency response, ±5% | 40 Hz to 1 kHz with 305 m (1,000 ft) of cable |
| Frequency response, ±3 dB | 25 Hz to 2 kHz with 305 m (1,000 ft) of cable |
| Output bias voltage | −10.0 ±2.0 VDC |
| Velocity range | 1,270 mm/s (50 in/s) |
| Broadband noise floor, 5 Hz to 2 kHz | 0.05 mm/s RMS maximum |
| Extended-temperature sensitivity stability | Within ±10% up to +399°C sensor temperature; within ±15% up to +482°C, with electronics between −54°C and +125°C |
Acceleration Output
| Parameter | Specification |
|---|---|
| Sensitivity | 1.02 mV/(m/s²), equivalent to 10 mV/g, ±5% |
| Frequency response, ±5% | 25 Hz to 4 kHz with 305 m (1,000 ft) of cable |
| Frequency response, ±3 dB | 10 Hz to 10 kHz with 305 m (1,000 ft) of cable |
| Output bias voltage | −10.0 ±2.0 VDC |
| Acceleration range | 4,900 m/s² (500 g) |
| Broadband noise floor, 5 Hz to 2 kHz | 147 mm/s² RMS (1.5 mg RMS) maximum |
| Extended-temperature sensitivity stability | Within ±10% up to +399°C sensor temperature; within ±15% up to +482°C, with electronics between −54°C and +125°C |
Test conditions: The supplied electrical specifications apply at +20°C to +30°C, with machine casing vibration at 100 Hz and a 10 kΩ load, unless otherwise stated. Frequency-response figures depend on the specified cable arrangement. Confirm the manufacturer's full specification when comparing performance under different loads or installation conditions.
Temperature Limits and Mechanical Installation
| Component or condition | Specified limit | Installation consideration |
|---|---|---|
| Sensing head | −54°C to +482°C (−65°F to +900°F) | Position the sensing head at the measurement location without exceeding the rated temperature. |
| Mineral-insulated cable | −54°C to +482°C (−65°F to +900°F) | Route and secure the cable to prevent mechanical damage and avoid exceeding the rating. |
| Signal-conditioning electronics | −54°C to +125°C (−65°F to +257°F) | Locate the electronics in an area that remains within their operating temperature limits. |
| Electronics soak-back survivability | +155°C (+311°F) for four hours | Survival does not guarantee electrical performance during this exposure. |
| Shock survivability | 19,620 m/s² (2,000 g) peak maximum | Do not interpret shock survivability as a continuous operating condition. |
| Relative humidity | 100% condensing, non-submerged | The case is hermetically sealed; this does not mean the sensor can operate submerged. |
| Maximum use altitude | 2,000 m (6,561 ft) above sea level | Check site elevation against the stated operating limit. |
| Mounting-hole pattern | 30.2 mm (1.188 in) square | Use the specified four-hole mounting layout. |
| Mounting-hole diameter | 7.2 mm (0.283 in) | Verify hole size and fastener fit before installation. |
| Mounting surface finish | 32 microinch RMS | Prepare a flat, stable mounting surface to support reliable mechanical coupling. |
| Material | Nickel alloy 600 | Check the manufacturer's installation drawing for material and assembly details. |
| Outdoor installation | Protected enclosure with wiring protected in conduit is the standard arrangement | Optional splash boots may provide additional protection where required. |
System Integration: Using Both Outputs Correctly
The 350900 HTVAS is useful when a machine requires a velocity signal for protection while retaining an acceleration signal for diagnostic analysis. These outputs have different sensitivities and frequency-response ranges, so configure each input according to the intended measurement.
- Velocity channel: Apply the specified sensitivity of 3.94 mV/mm/s when scaling and interpreting the velocity output.
- Acceleration channel: Apply the specified sensitivity of 1.02 mV/(m/s²) when scaling and interpreting acceleration.
- Channel allocation: When connecting both outputs to a 3500/42M or 3500/44M, use the required separate channel pair, such as channels 1 and 3, or use separate monitors.
- Cable verification: The selected integral cable is approximately 8.0 m. Include the complete cable arrangement when checking the maximum permitted length and system response.
- Power and grounding: Verify the required negative DC supply and confirm the case-isolated grounding arrangement against the installation documentation.
Do not treat the velocity and acceleration outputs as interchangeable inputs. Their sensitivity, frequency range, scaling, and diagnostic purpose differ. Confirm the monitor channel type and configuration before connecting either signal.
Equipment and Application Scenarios
- High-temperature rotating machinery: Applications where the measurement point approaches the sensing head's rated temperature limit and the electronics can remain within their own limits.
- Turbines and hot-section auxiliary equipment: Potential use where the OEM-approved measurement location and machinery monitoring design require vibration measurements at elevated temperatures.
- Industrial process equipment: Suitable for evaluated applications where both velocity-based monitoring and acceleration-based diagnostics provide useful condition information.
- Machinery using Bently Nevada 3500 monitoring systems: Primarily intended for the 3500/42M and 3500/44M, subject to the correct input arrangement and system configuration.
- Remote signal-conditioning installations: Useful when the sensing head must remain near a hot machine surface while the electronics sit in a cooler, accessible location.
These scenarios are application examples, not confirmation that every turbine, compressor, or machine accepts this sensor. Verify the machinery manufacturer's requirements, mounting arrangement, monitor compatibility, hazardous-area conditions, and expected vibration spectrum before selection.
Field Diagnostics: What to Check When Readings Look Wrong
| Symptom | Likely investigation area | Recommended check |
|---|---|---|
| Velocity and acceleration trends disagree | Different frequency ranges, channel scaling, or signal-processing settings | Check each channel's sensitivity, units, frequency filtering, and measurement purpose before assuming a sensor failure. |
| Both signals drift after a hot restart | Temperature exposure, mounting changes, cable stress, or electronics operating conditions | Compare actual sensing-head and electronics temperatures with their respective limits; inspect mounting and cable routing. |
| One output is missing while the other remains available | Output-specific wiring, input configuration, or monitor channel issue | Review the affected channel's wiring and configuration against the manufacturer's drawing. Isolate the system safely before testing connections. |
| High-frequency vibration appears inconsistent | Acceleration channel bandwidth, cable conditions, mounting rigidity, or monitor filtering | Check the acceleration channel's response range, configured filters, mounting surface, and complete cable length. |
| Readings change after maintenance | Sensor reinstallation, mounting surface condition, routing changes, or channel reassignment | Confirm the sensor is mounted correctly, wiring matches the original design, and channel assignments remain valid. |
| Signal problems appear after prolonged heat exposure | Electronics temperature or exposure beyond the specified operating conditions | Review temperature records. The +155°C four-hour soak-back rating describes survivability, not guaranteed measurement performance. |
Field-engineering recommendation: Record baseline readings for both outputs under stable operating conditions. During troubleshooting, compare each output independently, review monitor configuration, and correlate anomalies with machine speed and temperature. Follow site safety procedures and the manufacturer's test instructions before disconnecting protection channels.
Global PLC Spare HUB's Insight
The key selection issue for the 350900-315 is thermal separation, not simply the sensor's maximum temperature rating. The sensing head and mineral-insulated cable can withstand higher temperatures than the signal-conditioning electronics, so the installation must control heat exposure across the entire assembly.
- Map the thermal gradient: Measure or estimate temperatures at the sensing head, cable route, and electronics mounting location separately.
- Preserve dual-signal functionality: Decide which monitor channels will receive velocity and acceleration before installation, and verify their configuration individually.
- Review frequency needs: The acceleration output extends to a higher specified frequency than the velocity output. Select and configure channels according to the diagnostic objective.
- Check cable length end to end: The 315 suffix specifies an approximately 8.0 m integral cable. Verify the complete signal path against the maximum permitted cable length and performance requirements.
- Separate survival from performance: Short-duration electronics exposure at +155°C does not mean the unit maintains normal electrical performance at that temperature.
For a replacement inquiry, provide the complete part number, existing monitor model, intended channel arrangement, measured temperatures, and cable-routing requirements. These details help establish whether the replacement matches the installation rather than relying on the model name alone.
Warranty, Packing and Shipping
- Product condition: New, original item, subject to order confirmation and availability.
- Warranty: 12-month warranty against qualifying product defects, subject to the applicable sales terms.
- Country of manufacture: USA, as specified for this product.
- Packing: Protective packing suitable for industrial spare-part shipment.
- Shipping methods: FedEx, UPS, and DHL, subject to destination and service availability.
- Order verification: Confirm the full part number, required quantity, delivery destination, and any applicable export or documentation requirements before dispatch.
Frequently Asked Questions
1. Why does the 350900 provide both velocity and acceleration instead of only one vibration output?
The two outputs serve different monitoring purposes. Velocity supports machinery protection and overall vibration assessment, while acceleration provides a broader high-frequency response for diagnostic analysis. Using both can improve the information available to maintenance teams, provided each channel uses the correct sensitivity and configuration.
2. Can the electronics be mounted next to the sensing head at +482°C?
No. The sensing head and mineral-insulated cable have a specified upper temperature limit of +482°C, while the electronics have a maximum operating temperature of +125°C. Plan the installation so the electronics remain within their own temperature range, including heat soak after shutdown.
3. How should I verify whether the 8.0 m cable version is long enough?
Measure the actual route from the sensing head to the electronics and onward through the required monitoring connection. Allow for routing, securing, and service access, then verify the complete cable arrangement against the manufacturer's maximum cable-length and performance requirements. The 315 suffix alone does not guarantee suitability for every installation.
4. What information should I provide when requesting a replacement quotation?
Provide the complete part number, monitor model, required velocity and acceleration channels, cable length, operating temperatures, mounting details, and hazardous-area requirements if applicable. A photograph of the nameplate and existing installation can also help identify configuration differences before ordering.
5. Can I connect the velocity and acceleration outputs to adjacent channels on a 3500 monitor?
Do not assume that any two adjacent channels are acceptable. The supplied guidance requires the two outputs to use a separate channel pair, such as channels 1 and 3, or separate monitors. Confirm the applicable 3500/42M or 3500/44M configuration and wiring documentation before commissioning.
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