990 Vibration Transmitter Overview

The 990 Vibration Transmitter is designed for original equipment manufacturers (OEMs) of centrifugal air compressors, small pumps, motors, and fans. It provides a simple 4 to 20 mA proportional vibration signal that can be used as an input to the machinery control system. This transmitter is ideal for applications requiring accurate and reliable vibration monitoring.

Specifications

Electrical Characteristics:

• Input:

  • Accepts 1 non-contacting 3300 NSv Proximity Probe with extension cable.

• Power Supply:

  • Requires +12 to +35 Vdc input at the transmitter terminal.

• Signal Output:

  • 4 to 20 mA DC output in a 2-wire configuration, over the specified full-scale range.

• Loop Accuracy:

  • ±1.5% accuracy over the full-scale range. This accuracy is rated from the TEST signal input to the voltage measured across a 250 Ω loop resistance. The ±1.5% error is in addition to the Prox Out Incremental Scale Factor.

• Probe Gap:

  • The probe must be gapped between 0.5 mm (20 mils) and 1.75 mm (55 mils) from the target to ensure full-scale range.

• Maximum Loop Resistance:

  • Up to 1,000 Ω, including cable, at 35 Vdc.

• Current Limiting:

  • 23 mA typical.

• Zero and Span Adjustments:

  • Non-interacting external adjustments.

• Signal Defeat:

  • Signal output drops to less than 3.6 mA within 100 µs after a "Not OK" condition is detected. The output is restored within 2-3 seconds once the condition is cleared.

Environmental Limits:

• Operating Temperature Range:

  • -35°C to +85°C (-31°F to +185°F).

• Storage Temperature Range:

  • -52°C to +100°C (-62°F to +212°F).

Mechanical Characteristics:

• Transducer Tip Material:

  • Polyphenylene sulfide (PPS).

• Transducer Case Material:

  • AISI 303 or 304 Stainless Steel (SST).

• Probe Cable:

  • 75Ω coaxial, fluoroethylene propylene (FEP) insulated.

• Cable Armor (Optional):

  • Flexible AISI 302 SST with optional FEP outer jacket.

• Tensile Strength:

  • 222 N (50 lbf) maximum between probe case and probe lead.

• Transmitter Weight:

  • 0.43 kg (0.9 lb).

• Total System Weight (Typical):

  • 0.82 kg (1.8 lb).