Bently Nevada | 990-04-50-02-00 | 990 Vibration Transmitter

The 990 Vibration Transmitter is designed specifically for original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans. It serves as a simple and reliable means of providing a proportional vibration signal (4 to 20 mA) to the machinery control system.

Electrical Specifications:

• Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
• Power Requirements: Requires +12 to +35 Vdc input at the transmitter terminal.
• Signal Output: Provides a 4 to 20 mAdc signal over specified full-scale range in 2-wire configuration.
• Loop Accuracy: Within ±1.5% over specified full-scale range. Accuracy is rated from the TEST signal input to the voltage measured across a 250 Ω loop resistance.
• Probe Gap: Probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from target to ensure full scale range.
• Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc.
• Current Limiting: 23 mA typical.

Environmental Limits:

• Transmitter Temperature:
  • Operating Temperature: -35 °C to +85 °C (-31 °F to +185 °F)
  • Storage Temperature: -51 °C to +100 °C (-60 °F to +212 °F).
• Probe Temperature:
  • Operating Temperature: -35 °C to +177 °C (-31 °F to +350 °F).
  • Storage Temperature: -51 °C to +177 °C (-60 °F to +350 °F).