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New ergonomic design. The Monitor 4 and Monitor 4 EC 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 linear reading for gamma and x-rays (above 40 keV).
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.
Display
Analog Meter holds full scale in fields as high
as 100X max reading.
Operating Range
0-50 mR/hr and 0-500, 0-5,000, 0-50,000 CPM or 0-500
µSv/hr
Range Switch
X1, X10, X100.
Monitor 4 Energy Sensitivity
Monitor 4 detects alpha down to 2.5 MeV; typical detection
efficiency at 3.6 MeV < 80%. Detects beta at
50 keV with 35% efficiency. Detects beta at 150
keV with 75% efficiency. Detects gamma and x-rays
down to 10 keV through the window, 40 keV minimum
through the sidewall. Normal background is approximately
10-20 CPM.
Monitor 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.
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Gamma Sensitivity:
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Operating Range |
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.
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0-.5, 0-5, 0-50 mR/hr
0-500, 0-5,000, 0-50,000 CPM or 0-500 µSv/hr
0-50 mR/hr.
Range Switch
X1, X10, X100, Battery Check.
Accuracy
Typically ±15% of reading
(referenced to Cs-137) |
Monitor
4 & Monitor USB
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Monitor 4EC & Monitor
4EC USB
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Accuracy
±15% of full scale (referenced to Cs-137)
Audio
Internally mounted beeper (can be turned
off for silent operation).
Power Requirements
9-volt alkaline battery up to 2,000 hrs at
normal background
Temperature Range
-20° C to 55° C (-4° F to 131° F).
Weight
Monitor 4: 223.9 grams (7.9 oz) without battery
Monitor 4EC: 245.7 grams (8.7 oz) without battery
Outputs
1/8 inch headphone jack with pulse out.
Size
210 x 70 x 48 mm (8.25 x 2.75 x 1.875 in.)
Accessories
Observer Software, SI
Meter Option, NIST Calibration
Warranty
1 year limited warranty
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