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Monitor 4 & 4EC:

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The MONITOR 4 and MONITOR 4EC are compact, general purpose survey meters capable of detecting alpha, beta, gamma, and x-rays over 3 selectable ranges. A red count light flashes and a beep sounds with each event detected. The Monitor 4EC offers a more accurate linear reading for gamma and x-rays (above 40 keV). *Monitor 4 now available in kit form!*

  • Detector
    • Monitor 4: Halogen-quenched uncompensated GM tube with thin mica window 1.5-2.0 mg/cm2 thick.
    • Monitor 4EC: Halogen-quenched GM tube, energy compensated sidewall 2mm tin filter. Thin mica window 1.5-2.0 mg/cm2 thick.
  • Operating Range
    • 0-.5, 0-5, 0-50 mR/hr and 0-500, 0-5,000, 0-50,000 CPM or 0-500 µSv/hr and 0-50 mR/hr.
  • Range Switch
    • X1, X10, X100, Battery Check.
  • Accuracy
    • ±10% of full scale (referenced to Cs-137)

Monitor 4 Energy Sensitivity

  • 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.
  • Detects beta at 150 keV with 75% typical detection efficiency.
  • Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the sidewall of the detector.
  • Normal background is approximately 10-20 CPM.

Gamma Sensitivity:
1000 CPM/mR/hr

Monitor 4EC Energy Sensitivity Same as Monitor 4 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 (referenced to Cs-137).

 

 

Audio

Internally mounted beeper (can be switched off for silent operation).

Anti-Saturation Meter will hold at full scale in fields as high as 100 times the maximum reading.

Power Requirements One 9-volt alkaline battery. Battery life is up to 2,000 hours at normal background radiation levels

Temperature Range -20° C to 55° C (-4° F to 131° F).

Weight
M4: 178 grams (6.3 oz.) without battery
4EC: 198.1 grams (7 oz.) without battery

Size
145 x 72 x 38 mm (5.7 x 2.8 x 1.5 in.)

Includes
Carrying case and CE mark.

Options
Modification to run Observer Software. Stainless steel belt clip (attached to instrument).

Warranty
1 year limited warranty

Manual
English_Monitor4_Family_Manual.pdf
French_Monitor4_Family_Manual.pdf
Harpell Associates Inc.,
1272 Speers Road, Unit 2, Oakville, Ontario, Canada, L6L 2X4
Phone (905) 825-2588, Fax (905) 825-0234, Toll Free: 1-800-387-7168
Email:  Info@Harpell.ca