Introduction
Vibrations are a common occurrence in machinery such as blowers, fans, mills, and centrifuges. While permissible vibrations are harmless, exceeding these limits can threaten machine safety and lead to costly repairs and production stoppages. ISO 10816 sets the permissible vibration limits.

Causes of Increased Vibrations
Common causes include build-up on fan blades, wear of rotating parts, bearing wear, breakage, and coupling offset due to foundation sinking.

Solution: Electronic Vibration Monitoring
Vibration monitors can prevent damage by alerting operators or shutting down machines when vibrations exceed safe levels. This proactive approach can prevent breakdowns and extend machine life.

Product Variants

• VIBROCONTROL 868 – Monitors horizontal vibrations. Available with 230 V or 115 V AC, or +24 V DC power supply.
• VIBROCONTROL 869 – Monitors vertical vibrations. Available with 230 V or 115 V AC, or +24 V DC power supply.

Optional Accessories
Protective metal conduit and terminal housing for extending cable length.

Technical Specifications

• Measured Values: Vibration velocity (0-50 mm/s) and amplitude (0-500 µm).
• Operating Speed Range: 480 – 60,000 rpm.
• Accuracy: ±10%.
• Limit Value: Selectable 0-100% over full scale.
• Response Delay: 1 or 5 seconds.
• Limit Relay: 1 HV with 1 contact for alarm or shutdown.
• Switching Capacity: AC max. 250 VA, 1A; DC varies by voltage.
• Functional Check: Integral check button.
• Housing: Heavy-duty coated cast aluminium, IP65 rated.
• Weight: 1.6 kg.
• Environmental Temperature: Operating: -30 to +65°C; Storage: -40 to +100°C; Humidity: up to 95% non-condensing.

Contact Information
Brüel & Kjær Vibro A/S, Denmark and Brüel & Kjær Vibro GmbH, Germany, provide contact details for further inquiries.