Monitor 4 and 4EC Radiation Survey Meters

order online Monitor 4 pancake G-M detector by S.E. International

The Monitor 4 and Monitor 4EC are compact, general purpose survey meters capable of detecting gamma, and x-rays over 3 selectable ranges. A red count light flashes and a beep sounds with each event detected. The Monitor 4EC, (energy compensated) offers a more accurate linear reading for gamma and x-rays above 40 keV. Gamma sensitivity is typical of a G-M detector: 1000 CPM/mR/hr, referenced to Cs-137. Energy Sensitivity for the 4EC is the same as Monitor 4, but 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.

Note:

Our Survey Meters are new and up-to date. Included is a fresh calibration and warranty. Some vendors sell older versions with expired calibration and warranty. The meters are warranted for one year and the tubes are warranted for 90 days. We provide unlimited technical assistance via phone. To whatever vendor you choose, always ask about warranty, calibration, and technical assistance. Also, tell them your application to confirm that you are buying the appropriate survey meter.

Monitor 4 Demo video:

 

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Monitor 4 G-M Survey Meter
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Monitor 4EC G-M Survey Meter (Energy Compensated)
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Monitor 4 Survey Meter Specifications:

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.
Effective diameter of window is 9.1 mm (.36 in.).


Display
Analog Meter Scale.
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 (referenced to Cs-137)
Energy Sensitivity for the 4EC is the 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.

Operating Range

0-.5, 0-5, 0-50 mR/hr
0-500, 0-5,000, 0-50,000 CPM or 0-500 ÁSv/hr
0-50 mR/hr.

Range Switch
X1, X10, X100, Battery Check.
Accuracy
▒15% of full scale (referenced to Cs-137)

Monitor 4 Response Curve

Energy Response Curvey for the Monitor 4 Pancake G-M survey meter

Monitor 4EC Response Curve

Energy Response Curvey for the Monitor 4EC Pancake G-M survey meter

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
Monitor 4: 178 grams (6.3 oz.) without battery
Monitor 4EC: 198.1 grams (7 oz.) without battery
Size
145 x 72 x 38 mm (5.7 x 2.8 x 1.5 in.)
Warranty
1 year limited warranty

Accessories

SI meter dial for Monitor 4 pancake G-M Survey meter

Carrying Case | Observer Software

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