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Prevent Costly HVAC Failures with a Simple Dry Switch Monitor!

September 1, 2025

Dry contact monitoring is a critical component in HVAC and Building Automation Systems (BAS), designed to enhance equipment protection, safety, and efficiency. By detecting key process conditions—such as water flow, pressure, or switch positions—it ensures that systems operate only when safe, preventing costly damage and downtime. These systems also play a vital role in meeting regulatory compliance, enabling remote monitoring, and optimizing energy usage across various applications.

 

Ensuring Equipment Protection
Prevents damage to pumps, chillers, compressors, and other equipment by ensuring that a necessary condition (like water flow) is met before operation.
Protects against dry running, which can cause overheating and wear in pumps.

Monitoring Critical Signals
Detects status changes (ON/OFF) in dry contact signals from field devices like float switches, pressure switches, and flow switches. Used in fail-safe mechanisms to shut down equipment when required conditions are not met.

Preventing System Failures
Ensures that motors, pumps, and HVAC components operate only when conditions are safe. Prevents cavitation in pumps due to a lack of water flow.

Safety & Compliance
Many regulatory codes require monitoring of key HVAC/BAS parameters.
Helps in early fault detection and troubleshooting to avoid hazards.

Remote Monitoring & Alerts
In BAS, dry switch monitors help in integrating alarms and alerts for immediate action. Sends a signal to BMS systems to trigger automated responses.

Enhancing Energy Efficiency
Stops unnecessary power consumption when a process condition is not met.
Helps in optimizing equipment runtime and maintenance schedules.

Examples of Use Cases
Chilled Water Pumps – Prevents dry running by detecting water availability.
Cooling Towers – Ensures proper fan operation based on water level.
Fire Sprinkler Systems – Monitors pressure switches for emergency activation.
AHUs & FCUs – Monitors condensate drain float switches to prevent overflow.

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