Leak Detection for Liquid-Cooled Data Centers
Leak detection is a critical safety layer in liquid-cooled data centers. Coolant leaks — even small ones — can cause catastrophic damage to IT equipment. Point sensors, rope-style cable sensors, and zone controllers provide early warning of coolant presence, enabling rapid response before equipment damage occurs.
How It Works
Point leak detection sensors use conductive probes that detect the presence of conductive fluid (water or glycol/water) between the probe tips. When fluid bridges the gap, the sensor triggers an alarm output. Rope-style (cable) sensors use a sensing cable that can be routed along floor channels, under raised floors, or around equipment. When conductive fluid contacts the cable, the zone controller detects the change in cable impedance and triggers an alarm, often with location indication. Zone controllers aggregate multiple sensors and communicate with the BMS via relay, 4–20mA, Modbus, or BACnet.
Applications
- Under-floor leak detection in raised floor data centers
- Rack-level leak detection for direct-to-chip cooling
- CDU and cooling infrastructure leak monitoring
- Hot aisle and cold aisle containment monitoring
- Pipe chase and cooling plant room monitoring
- AI data center liquid cooling safety systems
- OEM liquid-cooled rack and server systems
- Modular data center cooling infrastructure
Key Technical Specifications
| Sensor Types | Point sensor, rope/cable sensor, zone controller |
| Detection Fluid | Water, glycol/water, conductive fluids |
| Response Time | < 1 second typical for point sensors |
| Cable Length | Up to 200m per zone (rope type) — model dependent |
| Output | Relay (NO/NC), 4–20mA, Modbus RTU/TCP, BACnet |
| Alarm Integration | BMS, DCIM, standalone alarm panel, email/SMS gateway |
| Installation | Floor-mount, rack-mount, cable routing in floor channels |
| Power Supply | 12–24VDC, 110–240VAC — model dependent |
| Protection Rating | IP65 typical for zone controllers |
| Certifications | Options available depending on configuration and manufacturing partner. Please specify project requirements. |
Specifications are indicative. Final parameters depend on manufacturing partner and project configuration. Contact us with your specific requirements.
Available Configurations
- Point sensor — for specific leak-prone locations (pipe joints, valve connections)
- Rope/cable sensor — for continuous coverage along floor channels or under raised floors
- Zone controller with multiple sensor inputs — for large area coverage
- Relay output — for simple alarm panel integration
- Modbus-enabled zone controller — for BMS and DCIM integration
- Location-indicating system — identifies leak location along the cable
- Standalone alarm panel — for sites without BMS integration
- Wireless sensor — for retrofit installations where cabling is difficult
Materials
Operating Conditions
- Detection fluid: water and glycol/water are conductive and detectable; confirm dielectric fluid compatibility
- Temperature: confirm ambient temperature range for sensor and controller
- Cable routing: avoid routing near high-voltage cables to prevent false alarms
- Floor type: raised floor, slab, or trench — specify for appropriate sensor selection
- BMS integration: specify protocol (relay, Modbus, BACnet) and data points required
- Response time: specify maximum acceptable response time for the application
Selection Guide
Leak detection selection requires: (1) Coverage area — point sensors for specific locations; rope sensors for continuous coverage; (2) Fluid type — confirm the coolant is conductive (water and glycol/water are; dielectric fluids may not be); (3) BMS integration — specify the required protocol and alarm data points; (4) Location indication — systems that identify the leak location along the cable reduce response time; (5) Response time — specify the maximum acceptable time from leak occurrence to alarm; (6) Installation environment — raised floor, slab, or trench affects sensor selection and cable routing.
OEM & Custom Manufacturing
Custom leak detection configurations are available for OEM liquid-cooled rack and server manufacturers. Custom options include integrated rack-level sensors, proprietary alarm interfaces, specific cable lengths and routing configurations, and private label manufacturing. Provide your rack layout and alarm integration requirements for a system design review.
Submit Custom RequirementQuality & Testing
Leak detection systems for data center applications should be tested at commissioning by simulating a leak at each sensor location. Zone controllers should be verified to trigger the correct alarm output and BMS notification. Rope sensors should be tested along their full length to verify continuous coverage. Periodic functional testing is recommended as part of the data center maintenance program.
Frequently Asked Questions
Can leak detection sensors detect glycol/water coolant?
Yes. Glycol/water mixtures are conductive and are detected by standard conductive leak detection sensors. The conductivity of the mixture decreases with increasing glycol concentration, but standard sensors are sensitive enough to detect typical data center coolant concentrations (20–40% glycol). Confirm the specific glycol concentration with the sensor manufacturer.
What is the difference between a point sensor and a rope sensor?
A point sensor detects fluid at a specific location — typically under a pipe joint, valve, or connection point. A rope (cable) sensor provides continuous coverage along its length and can detect a leak anywhere along the cable route. Rope sensors are more effective for large area coverage such as under raised floors or along cooling infrastructure runs.
How is a leak detection system integrated with the BMS?
Zone controllers communicate with the BMS via relay output (for simple alarm), 4–20mA (for analog status), Modbus RTU or TCP, or BACnet. The BMS receives alarm status and, in advanced systems, leak location data. Specify the required protocol and data points when selecting a zone controller.
What should happen when a leak is detected?
The response to a leak alarm depends on the severity and location. Typical responses include: BMS alarm notification to operations staff; automatic shutoff of the affected cooling circuit via motorized isolation valves; server workload migration away from the affected rack; and dispatch of maintenance personnel. The response procedure should be defined in the data center operating procedures before the cooling system is commissioned.
Need Leak Detection Sensors for Your Project?
Send your connection size, coolant type, flow requirements and estimated quantity. Our team will review the application and identify suitable manufacturing options.