350900-394 Bently Nevada Velocity Acceleration Sensor

Bently Nevada 350900-394 High Temperature Velocity and Acceleration Sensor (HTVAS)

• Manufacturer & Model: Bently Nevada 350900-394 High Temperature Velocity and Acceleration Sensor (HTVAS) for continuous vibration monitoring.
• Product Type: Dual output sensor providing both acceleration and velocity signals simultaneously.
• Measurement Type: Continuous acceleration and velocity output from a single device.
• Made in: U.S.A.
• Application: High temperature machinery monitoring including turbines, compressors, and pumps.
• Output Configuration: Two independent analog outputs for velocity and acceleration.

Output Specifications

• Velocity Output: 4 to 20 mA proportional to velocity amplitude.
• Velocity Range: 0 to 50 mm/s RMS standard (configurable).
• Velocity Frequency Response: 10 Hz to 1 kHz ±10%.
• Acceleration Output: 4 to 20 mA proportional to acceleration amplitude.
• Acceleration Range: 0 to 5 g peak standard (configurable).
• Acceleration Frequency Response: 2 Hz to 10 kHz ±10%.
• Output Load: 600 ohms maximum per channel.
• Output Accuracy: ±5% of reading from 10% to 100% of range.

Environmental Specifications

• Operating Temperature: -40°C to 150°C (-40°F to 302°F) continuous.
• Extended Temperature Capability: Up to 180°C (356°F) for short duration.
• Storage Temperature: -50°C to 150°C (-58°F to 302°F).
• Humidity: 100% condensing with IP67 sealing.
• Vibration Limit: 50g peak maximum continuous.
• Shock Limit: 500g peak, 1 ms half-sine.
• Ingress Protection: IP67 when properly installed.

Sensor Specifications

• Sensing Element Velocity: Piezoelectric velocity sensing.
• Sensing Element Acceleration: Piezoelectric accelerometer.
• Transverse Sensitivity: Less than 5% of axial sensitivity.
• Amplitude Linearity: ±2% of full scale.
• Resolution: 0.1 mm/s RMS for velocity, 0.01 g for acceleration.
• Noise Floor: Less than 0.1 mm/s RMS velocity, 0.005 g acceleration.
• Warm-up Time: Less than 10 seconds to stable output.

Model Number Breakdown

• 350900-394: Complete HTVAS sensor assembly part number.
• 350900: Series designation for High Temperature Velocity and Acceleration Sensor family.
• 394: Specific configuration code for output ranges and connector type.

Physical Specifications

• Sensor Height: 85 mm (3.35 in) from mounting surface.
• Sensor Width: 35 mm (1.38 in) hex body.
• Mounting Thread: 1/4-28 UNF female thread.
• Mounting Stud: Included stainless steel stud.
• Housing Material: 316L stainless steel hermetically sealed.
• Connector Type: 2-pin MIL-C-5015 style connector.
• Cable Included: 3 meter (10 ft) high temperature cable with mating connector.
• Cable Temperature Rating: -50°C to 200°C (-58°F to 392°F).
• Total Weight: Approximately 0.4 kg (0.88 lb) including cable.

Electrical Specifications

• Supply Voltage: 18 to 30 Vdc, nominal 24 Vdc.
• Supply Current: Less than 40 mA per output channel.
• Total Power Consumption: 2 watts maximum.
• Reverse Polarity Protection: Yes, internal protection diode.
• Overvoltage Protection: 36 Vdc maximum safe input.
• Output Short Protection: Continuous short to ground or supply.
• Isolation: 500 Vdc from case to electronics.

Frequency Response Details

• Velocity Low Frequency (-3 dB): 8 Hz typical.
• Velocity High Frequency (-3 dB): 1.2 kHz typical.
• Acceleration Low Frequency (-3 dB): 1.5 Hz typical.
• Acceleration High Frequency (-3 dB): 12 kHz typical.
• Phase Linearity: ±10 degrees from 10 Hz to 500 Hz for velocity.
• Resonant Frequency: Greater than 25 kHz for acceleration element.

Installation and Mounting

• Mounting Orientation: Any orientation, no fluid settling issues.
• Mounting Torque: 10 Nm (7.4 lb-ft) recommended.
• Surface Preparation: Clean, flat surface within 0.05 mm.
• Required Tool: 35 mm open-end wrench for installation.
• Cable Bend Radius: Minimum 50 mm (2 in) for cable.
• Grounding: Case isolated from electronics, external ground recommended.

Package Contents and Shipping Information

• Included Components: 350900-394 HTVAS sensor, mounting stud, 3m high temp cable with connector.
• Documentation: Installation manual, calibration certificate, and frequency response graph.
• Certification: Individual factory calibration traceable to NIST.
• Shipping Weight: Approximately 0.6 kg (1.32 lb).
• Packaging: Anti-static foam in heavy duty cardboard box.
• Express Shipping Options: FedEx, UPS, or DHL worldwide.

Frequently Asked Questions

• Q: What is the Bently Nevada 350900-394 HTVAS sensor?
  A: This is a High Temperature Velocity and Acceleration Sensor. It provides continuous acceleration and velocity output from a single device for machinery monitoring.
• Q: What outputs does the 350900-394 sensor provide?
  A: The sensor provides two independent 4 to 20 mA outputs. One output represents velocity amplitude, the other represents acceleration amplitude.
• Q: What temperature range does the 350900-394 handle?
  A: The sensor operates continuously from -40°C to 150°C (-40°F to 302°F). Short duration exposure up to 180°C (356°F) is acceptable.
• Q: What frequency ranges does each output cover?
  A: The velocity output covers 10 Hz to 1 kHz. The acceleration output covers 2 Hz to 10 kHz, making it suitable for both low and high frequency monitoring.
• Q: What power supply do I need for the 350900-394?
  A: You need an 18 to 30 Vdc power supply, 24 Vdc nominal. Total power consumption is only 2 watts maximum for both outputs.