Shenzhen Wanyi Technology Co., Ltd. (CESTSEN), a radon gas sensor manufacturer based in Shenzhen, China, has released the RAD-S40 diffusive radon sensor, a compact planar silicon detector module built for long-term indoor radon concentration monitoring. The sensor is now available to OEM and ODM customers, system integrators and distributors worldwide.
The RAD-S40 uses the radioactive characteristics of radon gas and its daughters. Alpha counts are collected by a planar silicon detector with a 56 mm2 sensitive area (7.5 x 7.5 mm) and processed by an integrated signal acquisition system, which converts the count rate into a radon concentration value. This static diffusion design delivers stable, continuous measurement without pumps, filters or moving parts.
| Index | Parameter |
|---|---|
| Detector | Silicon detector |
| Measurement Range | 5 - 65535 Bq/m3 |
| Detection Sensitive Area | 56 mm2 (Size: 7.5 x 7.5 mm) |
| Sensitivity | 0.013 cph/[Bq/m3]; 0.481 cph/[pCi/L] |
| Detection Limit | 5 Bq/m3 |
| Background Count Rate | <= 0.05 cph |
| Repeatability | <= 10%, K=2 (After 180 hours, at 200 Bq/m3) |
| Measurement Time | >= 60 min |
| Power Supply | 3.0 V |
| Power Consumption | <= 150 uW |
| Communication | UART / I2C, 9600 bps / 400 kHz |
| Operating Environment | Temp: 0 to +45 C; RH: <= 90% (+45 C) |
| Dimensions | 54.0 x 35.0 x 14.6 mm |
Radon monitoring products usually need a sensor that stays stable for years inside a sealed enclosure. The RAD-S40 combines a wide 5 to 65535 Bq/m3 range with a small 54.0 x 35.0 x 14.6 mm footprint and a simple two-wire digital interface, so hardware teams can add radon measurement to an existing board without redesigning the power budget. The humidity-insensitive detector also reduces calibration workload in the field, which matters for distributors who support end users remotely.
As a radon gas sensor manufacturer with production in Guangdong, China, CESTSEN supports sampling, trial orders and volume production. Minimum order quantity is one piece; stock units ship within three working days and production orders within 15 to 25 days, with a supply ability of 5000 pieces per month. Each sensor is packed in a CESTSEN branded color box with shock-proof foam insert and an export-grade corrugated carton, and the factory operates under ISO 9001:2015 with T/T payment terms.
Founded in 2011, Shenzhen Wanyi Technology Co., Ltd. develops and manufactures indoor air quality and environmental monitoring sensors, with around 70% to 80% of output exported to overseas markets. Distributors, integrators and brand owners looking for a dependable radon gas sensor manufacturer can contact the CESTSEN sales team for datasheets, samples and OEM pricing.
