Updated:2023-09-18
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The Monitor 4 is compact, analog radiation detector. A general purpose survey meter capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges. Proven and reliable over decades of use in the industry, the Monitor 4 has evolved into one of the best analog radiation detectors of today. Simple and ergonomic , a red count light flashes and a beep sounds with each count detected. Battery check and silent operation with the flick of your thumb.
Applications & Uses:Checking industrial gauges, such as moisture, density, or level gauges containing Cesium-137, Locating Sources, Personal protection, General surveying
Specifications
Detector |
Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm 2 thick. Effective diameter of window is 9.1 mm (.36 in.). |
Operating Range |
0-.5, 0-5, 0-50 mR/hr 0-500, 0-5,000, 0-50,000 CPM or 0-5, 0-50, 0-500 μSv/hr (SI Scale Meter Option) |
Range Switch | X1, X10, X100, Battery Check. |
Energy Sensitivity |
1000 CPM/mR/hr (Cs137). Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%. Detects beta at 50 keV with typical 35% detection efficiency and beta at 150 keV with typical 75% detection efficiency. Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case. |
Accuracy | Typically ±15% from factory, ±10% with NIST Source Calibration |
Display |
Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available |
Audio Indicator | Internally mounted beeper (can be turned off for silent operation). |
Outputs | 3.5 mm jack with pulse out. |
Power Requirements | 9-volt alkaline battery (included). Approx. 2,000 hrs. at normal background |
Temperature Range | -10° to +50°C (14° to 122°F) |
Humidity | 10% to 70% Non-Condensing. |
Weight | M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz) |
Size | 209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.) |
Includes | Carrying Case w/ Belt Clip |
Options | SI Meter Option, Observer Serial Software |
Limited Warranty | 1 year limited warranty |
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