Monitor 4
Applications & Uses: Checking industrial gauges, such as moisture, density, or level gauges containing Cesium-137, Locating Sources, Personal protection, General surveying
Detector
Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 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)
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% of reading (Cs137)
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Range Switch
X1, X10, X100, Battery Check.
Audio Indicator
Internally mounted beeper (can be turned off for silent operation).
Display
Analog Meter holds full scale in fields as high as 100X maximum reading. CPM & mR/hr scale. Optional SI Scale Meter Available
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Outputs
Headphone, 3.5 mm jack with pulse out.
Includes
Carrying Case w/ Belt Clip
Options
SI Meter Option, Observer Software
Limited Warranty
1 year limited warranty
Power Requirements
9-volt alkaline battery (included). Approx. 2,000 hrs. at normal background
Temperature Range
-20° to 55°C (-4° to 131°F)
Weight
M4: 200 g (7.1 oz) M4EC: 224 g (7.9 oz)
Outputs
3.5 mm jack with pulse out.
Size
209 x 71 x 50 mm (8.2 x 2.8 x 1.9 in.)
