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Monitor 4EC Survey Meter

Offers more accurate reading for gamma and x-rays above 40 keV than Monitor 4

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The Monitor 4EC is a compact general purpose easy-to-use survey meter capable of detecting alpha, beta, gamma and x-rays over 3 selectable ranges. A red counting light flashes and audible beep will sound with rising radiation levels. The Monitor 4 EC is accurate for reading gamma and x-rays above 40 keV.

The Halogen-quenched GM tube, energy compensated sidewall detects activity down to 10 keV through the window. The meter reads in Sv or R units and will hold full scale in activity 100 times maximum reading.

Item Numbers
5250-0046 Monitor 4EC Survey Meter

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  • Detector: Halogen-quenched GM tube, energy compensated sidewall 2mm thin filter. 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). M4EC is the same as M4 except the energy response for gamma and x-rays through the detector sidewall is flat within +61% or -26% over the range of 40 keV to 100 keV, and within +35% or -17% over the range of 100 keV to 1.3 MeV. Detects beta at 50 keV with typical 35% detection efficiency and beta at 150 keV with typical 75% detection efficiency.
  • Accuracy: Typically ±15% of reading (Cs137)
  • Range Switch: X1, X10, X100, Battery Check. Meter Face Options
  • 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).
  • Power Requirements: 9-volt alkaline battery. Approx. 2,000 hrs. at normal background
  • Temperature Range: -20° to 55°C (-4° to 131°F)
  • Outputs: 3.5 mm jack with pulse out.
  • Includes: Carrying Case w/ Belt Clip
  • Options: SI Meter Option, Observer Software, Mini-USB Option w/ USB Observer Software
  • Limited Warranty: 1 year limited warranty
  • Monitor 4 Kits: Build your own Monitor 4! Learn about how a geiger counter works!

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  • Weight of the Monitor 4EC: 7.9 oz (224 grams) without battery
  • Dimensions: 8.2″ x 2.8″ x 1.9″ (209 x 71 x 50 mm)

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