The Monitor 4 is a compact and versatile analog survey meter designed by S.E. International for detecting alpha, beta, gamma and X-ray radiation.
Rugged and easy to operate, it offers three selectable ranges (0-0.5, 0-5 and 0-50 mR/h), displaying readings in CPM or mR/h/µSv/h (with SI option).
Equipped with a halogen-quenched GM tube with a 1.5–2.0 mg/cm² mica window, the Monitor 4 provides excellent sensitivity to low-level radiation.
Each event triggers a red LED flash and audible beep (can be silenced for discreet use).
It runs on a 9 V alkaline battery providing up to 2 000 hours of continuous operation and includes a built-in battery test function.
Ideal for industrial gauge checks (Cs-137), source location, area monitoring and personnel protection, the Monitor 4 is valued for its reliability, accuracy and simplicity.
Applications:
- Ambient dose-rate measurement (alpha, beta, gamma, X-rays)
- Industrial gauge verification (Cs-137 moisture, density, level)
- Radioactive source location
- Area and personnel radiation protection
- Training and radiation safety demonstrations
Specifications
- Detector tube: halogen-quenched GM tube, mica window 1.5–2.0 mg/cm² (active area 9.1 mm Ø)
- Ranges: 0-0.5 / 0-5 / 0-50 mR/h • 0-500 / 0-5 000 / 0-50 000 CPM • or 0-5 / 0-50 / 0-500 µSv/h (SI option)
- Energy sensitivity: 1 000 CPM/mR/h (Cs-137)
- α ≥ 2.5 MeV (~ 80 %)
- β ≥ 50 keV (~ 35 %) – 150 keV (~ 75 %)
- γ/X ≥ 10 keV (window) or ≥ 40 keV through case
- Accuracy: ±15 % typical (±10 % NIST-traceable source)
- Display: analog meter – dual scale (CPM / mR/h / µSv/h)
- Indicators: red count light & audible beep (toggle off option)
- Pulse output: 3.5 mm jack
- Power: 9 V alkaline battery (~ 2 000 h)
- Operating temperature: –10 °C to +50 °C
- Humidity: 10 % to 70 % (non-condensing)
- Size: 209 × 71 × 50 mm
- Weight: 200 g (standard) / 224 g (EC version)
- Included accessories: carrying case with belt clip
- Warranty: 1 year
Models
- 010277 - Radiation Alert Monitor 4 Survey Meter
