数据中心机房冷媒泄漏气体报警器

数据中心精密空调常用冷媒：R134a、R410A、R32、R454Betc., refrigerant leakage will displace oxygen and cause suffocation; R32 is also weakly flammable. The refrigerant leak alarm consists ofOn-site detector + alarm controllerComposition, achieving 24h online monitoring, audible and visual alarm, linked exhaust, and integration with dynamic environment monitoring.

1. Sensor Principle Selection (NDIR infrared preferred for data centers)

1. NDIR non-dispersive infrared (first choice)Strong anti-interference, 8-10 years lifespan, low drift, unaffected by temperature, humidity, dust, or cleaning agents; compatible with R134a/R410A/R32/R454B, mainstream solution for data centers.
2. 电化学传感器: Low cost, 2-3 years lifespan, prone to drift, requires frequent calibration, not recommended for long-term use in data centers.
3. PID Photoionization：适合微量检漏，对部分冷媒选择性差，多用于便携式检漏仪。

量程建议：0‑5000ppm, resolution 1ppm; output interface: 4-20mA, RS485-Modbus RTU, easy to integrate with dynamic environment systems.

二、报警阈值（工程通用设置）

Table

级别	浓度	动作
一级预警	500‑1000ppm	弹窗提示，记录告警
二级报警	3000‑5000ppm	声光报警，自动启动事故排风机
三级联锁	≥8000ppm	强声光，联动空调冷媒切断阀，上传动环告警

参考标准：GB 50019-2015 'Code for Design of Heating, Ventilation and Air Conditioning for Industrial Buildings', GB/T9237-2017 'Refrigerating systems and heat pumps - Safety and environmental requirements', ISO5149 Refrigeration safety standardsAdditional note: R32 is a mildly flammable refrigerant; in addition to ppm concentration, attention should also be paid to25% LEL lower explosive limitAs the hard interlock protection threshold.

三、安装布点关键要点

Installation height (differentiated by refrigerant density)

• R134a, R410A: gas heavier than air, detector installed at a distance from the ground0.3‑0.6m安装。
• R32 (lighter than air): detector installed below the ceiling0.3‑0.6m，气体容易聚集顶部。

布点位置

• Key placement: around precision air conditioner compressors, refrigerant valves, flanges, hose connections, and pipeline welds (high-leakage locations).
• Single detector effective coverage radius ≤7.5m; avoid direct fan airflow, air outlets, strong electromagnetic equipment, and reserve space for calibration and maintenance.
• Alarm controller: placed in the duty room/central control room, 1.4-1.6m above the ground; equipped with backup power supply.Both inside and outside the equipment room, audible and visual alarm devices are installed.。
• Wiring: RS485 uses shielded twisted pair; 4-20mA uses three-core shielded cable; cables are routed through galvanized steel conduit for protection.

4. Linkage Functions (Required for Data Centers)

1. Alarm triggered→Automatically activate emergency exhaust fan(Mandatory requirement of GB50019)
2. High concentration alarm→link refrigerant pipeline shut-off valve
3. Signals are uploaded to the equipment room's DCIM platform for environmental monitoring, with pop-up and SMS alarms.
4. Local audible and visual alarm (inside machine room + duty area)

5. Daily Operation and Maintenance

1. After 30 minutes of stable power-on, perform zero calibration.
2. Calibrate with standard gas every 6 months; infrared sensor recommended to be replaced every 8-10 years.
3. Regularly clean the detector's dust filter screen to prevent dust accumulation from affecting detection accuracy.

6. Common Misconceptions

❌ Do not use ordinary combustible gas detectors to measure R134a/R410A; these two refrigerants are non-flammable, and catalytic combustion sensors cannot detect them. ❌ Portable leak detectors can only be used for manual inspection.Cannot replace fixed online alarm systems❌ Do not install all detectors above the ceiling: R134a/R410A are heavier than air, and after leakage they sink to the ground; installing at the top will cause missed detection.

VII. Equipment Qualifications (Key Points for Bidding/Acceptance)

Detector protection rating ≥ IP65; with metrological CPA type approval; for explosive atmospheres, equipped with Ex explosion-proof certificate; controller has backup battery, can maintain operation for ≥30 minutes after power failure; supports relay dry contact output for interlocking ventilation and shut-off valves.