Fixed Location Radiation Detection and Alarm System: CESTSEN GM-R200 + RAD-S104
A fixed radiation detection and alarm system is the cornerstone of any serious facility radiation safety program. Unlike portable meters that require staff to actively check readings, a permanently installed detection and alarm system monitors continuously — and responds instantly when radiation levels exceed safe thresholds, whether anyone is watching or not.
The CESTSEN GM-R200 Radiation Monitoring Host paired with RAD-S104 Fixed Sensor Probes delivers exactly this capability: a professionally engineered, scalable, fully integrated radiation detection and alarm solution for facilities of any size.
What a Fixed Radiation Detection Alarm System Must Deliver
A professionally specified fixed radiation alarm system requires five core capabilities:
| Requirement |
Why It Is Non-Negotiable |
| Continuous detection |
Radiation events do not announce themselves — gaps in monitoring create gaps in protection |
| Immediate alarm response |
Delayed alarms allow exposure to continue — response must be instantaneous |
| Multi-level alarm architecture |
Different threat levels demand different responses |
| Remote notification |
Safety officers cannot be on-site 24/7 |
| Compliance data logging |
Regulators require documented proof of monitoring |
The GM-R200 + RAD-S104 system addresses all five.
System Architecture: How GM-R200 + RAD-S104 Works Together
The system separates into two functional layers working in concert:
Detection Layer — RAD-S104 Sensor Probes
Multiple RAD-S104 probes are permanently wall-mounted at critical monitoring points throughout the facility. Each probe independently detects α/β/γ/X-ray radiation continuously, triggers its own onboard alarm if levels exceed thresholds, and transmits real-time dose rate data to the GM-R200 host via RS485 Modbus-RTU.
Control Layer — GM-R200 Monitoring Host
The GM-R200 receives data from all connected probes simultaneously, displays consolidated readings on a 7-inch touch LCD, manages centralized alarm logic, logs historical data, and transmits to cloud platforms and control systems — providing complete facility-wide radiation oversight from a single controller.
Dual-Layer Alarm Architecture — No Alert Ever Missed
The most important safety feature of this system is its two independent alarm layers operating simultaneously:
Layer 1: Probe-Level Onboard Alarm (RAD-S104)
Each RAD-S104 probe has its own built-in 2-level sound and light alarm that fires directly at the detection point — independently of the host controller and independently of network connectivity.
- Level 1 alarm — elevated radiation: alert personnel to investigate
- Level 2 alarm — critical radiation: initiate emergency response immediately
On-site personnel nearest the radiation source receive instant local warning with zero communication delay.
Layer 2: System-Level Cloud Alarm (GM-R200 + Platform)
The GM-R200 simultaneously manages system-level alarms through the ONETEST cloud platform:
- WeChat push notifications to radiation safety officers' smartphones
- SMS alerts to designated emergency contacts
- Email notifications with probe ID, location, and dose rate data
- Timestamped alarm records in the cloud platform database
Remote safety personnel receive complete alarm information within seconds — even when physically off-site.
GM-R200 + RAD-S104 System Specifications
GM-R200 Host:
| Parameter |
Specification |
| Probe Capacity |
1–25 RAD-S104 probes |
| Display |
7-inch touch LCD |
| Data Output |
RS485, 4G |
| Storage |
Large-capacity built-in; USB export |
| Alarm |
Configurable threshold; sound & light |
| Power |
DC 12V |
| Dimensions |
36 × 30 × 10 cm |
RAD-S104 Probe:
| Parameter |
Specification |
| Detectable Rays |
α, β, γ, X-rays |
| Sensor |
45mm mica GM tube — US imported |
| Range |
0.01–1000 μSv/h / 0–5000 CPS |
| Accuracy |
±15% |
| Energy Range |
20 keV – 3 MeV |
| Output |
RS485 Modbus-RTU |
| Alarm |
2-level onboard sound & light |
| Temperature |
-20°C to 60°C |
| Power |
12–24V DC |
| Certifications |
CE, ISO 9001, ISO 14001 |
Recommended Deployment by Facility Type
Hospital Radiation Safety Network
| Location |
RAD-S104 Probes |
Alarm Priority |
| X-ray / CT rooms |
1 per room |
Level 1 + Level 2 |
| Nuclear medicine prep |
1–2 per area |
Level 1 + Level 2 |
| Radioactive waste storage |
1 per room |
Level 2 only |
| Adjacent corridors |
1 per zone |
Level 1 only |
One GM-R200 host at the radiation safety office monitors all points simultaneously.
Industrial NDT Facility
Probes at radiography bay perimeter walls and adjacent work areas — immediate alarm if gamma source exposure creates dose rates exceeding controlled area boundary limits.
Customs and Port Inspection
Probes at cargo X-ray operator workstations — continuous documentation that occupational dose rates comply with national limits, with cloud records available for regulatory inspection at any time.
Scrap Metal Processing
Probes at incoming material gates, storage yard perimeters, and furnace charging zones — real-time alarm chain that stops contaminated material before it reaches the furnace.
System Scalability: Start Small, Expand Freely
| Installation Scale |
Configuration |
| Single room |
1 × GM-R200 + 1 × RAD-S104 |
| Small clinic (3–5 rooms) |
1 × GM-R200 + 3–5 × RAD-S104 |
| Hospital floor (10+ rooms) |
1 × GM-R200 + 10+ × RAD-S104 |
| Large facility (full coverage) |
1 × GM-R200 + up to 25 × RAD-S104 |
The GM-R200 host auto-recognizes newly added probes — expanding coverage requires only mounting a new RAD-S104 and connecting it to the existing RS485 bus.
Conclusion
For facilities requiring a certified, scalable fixed radiation detection and alarm system — with dual-layer probe and cloud alarm architecture, full-spectrum detection, and RS485 system integration — the CESTSEN GM-R200 + RAD-S104 is a proven, professionally engineered solution deployable from single-room to 25-point facility-wide coverage.
Contact ONETEST Technology today for a facility-specific system design and quotation.
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