Split-Type Multi-Function Radiation Dose Rate Meter: Why the CESTSEN GM-R200 + RAD-S104 Is the System of Choice
When a single fixed radiation detector is not enough — when your facility has multiple rooms, multiple radiation sources, and multiple regulatory monitoring requirements — a split-type multi-function radiation dose rate meter system is the right architectural choice.
The CESTSEN GM-R200 Radiation Monitoring Host paired with RAD-S104 Fixed Sensor Probes is precisely this: a professionally engineered, modular, scalable split-type system that brings together intelligent centralized control and distributed high-sensitivity detection in one unified solution.

What Is a Split-Type Radiation Dose Rate Meter?
A split-type radiation dose rate meter separates the system into two functional layers:
The sensor probe layer — multiple detection units permanently installed at critical monitoring points throughout the facility, each independently measuring local radiation dose rates in real time.
The host controller layer — a centralized display and data management unit that collects readings from all connected probes, displays consolidated data, manages alarms, logs historical records, and transmits data to control systems or cloud platforms.
This split architecture offers decisive advantages over single-unit standalone monitors:

The System: GM-R200 Host + RAD-S104 Probe
GM-R200 — The Intelligent Monitoring Host
The GM-R200 Online Radiation Monitoring System is a Geiger-Müller tube based radiation monitoring host developed by CESTSEN (Shenzhen WanYi Technology Co., Ltd.). It serves as the brain of the split-type system — collecting, processing, displaying, and transmitting radiation data from all connected sensor probes.

GM-R200 Key Specifications:

RAD-S104 — The Professional Sensor Probe
The RAD-S104 Fixed Radiation Sensor Probe is the recommended sensing front-end for the GM-R200 system. Each probe operates as an independent detection node, continuously measuring local radiation levels and transmitting data to the GM-R200 host via RS485 Modbus-RTU.
RAD-S104 Key Specifications:

5 Key Advantages of the GM-R200 + RAD-S104 Split System
1. True Multi-Function Detection in One System
The RAD-S104's 45mm US-imported mica GM tube detects all four ionizing radiation types simultaneously — α, β, γ, and X-rays. Combined with the GM-R200's multi-probe architecture, the system functions as a complete multi-function radiation monitoring platform covering every radiation type at every monitoring point in your facility.
2. Freely Scalable — 1 to 25 Probes Per Host
Start with a single RAD-S104 probe monitoring one critical room, and scale up to 25 probes on a single GM-R200 host as your monitoring requirements grow — without replacing the host controller. This modular scalability dramatically reduces both initial investment and future expansion costs.
3. Mixed Probe Configuration
The GM-R200 host is compatible with the full CESTSEN RAD-S sensor probe family. A single host can simultaneously connect:

This mixed-probe flexibility allows a single GM-R200 host to serve a diverse facility with different radiation monitoring requirements in each zone — truly multi-function at the system level.
4. Dual-Level Alarm Architecture
The GM-R200 + RAD-S104 system provides alarm coverage at two independent levels:
Probe-level: Each RAD-S104 has its own onboard 2-level sound and light alarm — triggering immediately at the point of detection, independent of host communication status. Personnel near the probe receive instant local warning.
System-level: The GM-R200 host manages consolidated alarm logic across all probes — triggering centralized alarms, logging alarm events with timestamps, and pushing notifications to remote operators via cloud platform.
This dual-layer architecture ensures no alarm is ever missed — even during network interruptions or host maintenance.

5. Factory Pre-Calibrated — Zero Commissioning Overhead
Every RAD-S104 probe ships fully calibrated against CESTSEN's in-house Co-60 and Cs-137 standard radioactive sources. The GM-R200 host auto-recognizes connected probes on power-up. The complete system can be commissioned in hours, not days — minimizing installation downtime and specialist commissioning costs.

Typical Deployment Scenarios
Multi-Room Hospital Radiation Safety Network
Connect RAD-S104 probes in X-ray rooms, CT suites, nuclear medicine prep areas, and radioactive waste storage — all monitored from a single GM-R200 host at the radiation safety office, with cloud alerts to the radiation protection officer's smartphone.
Industrial NDT Facility Perimeter Monitoring
Deploy RAD-S104 probes at the walls and doorways of radiography bays, with the GM-R200 host in the control room — providing real-time verification that radiation levels in adjacent occupied areas comply with controlled zone boundary limits during exposure operations.
Customs and Port Inspection Infrastructure
Install probes at operator workstations beside multiple cargo X-ray inspection lanes — one GM-R200 host centrally monitoring all operator positions simultaneously, with immediate alarm if any position exceeds occupational dose rate limits.
Pharmaceutical and Radiopharmacy Facilities
Monitor isotope preparation rooms, dispensing areas, patient injection bays, and decay storage simultaneously — with mixed RAD-S104 and RAD-S101 probes on one host providing application-matched detection at each zone.
Scrap Metal and Steel Processing Facilities
Deploy probes at incoming material gates, storage yard boundaries, and furnace charging areas — the GM-R200 providing centralized monitoring with immediate alarm to halt contaminated scrap before furnace entry.