User Manual

Specifications
Radiation detected Beta > 1 MeV
Gamma > 25 keV
Operating ranges,
response time
0 μR/h to 500 μR/h (5 sec)
0 mR/h to 5 mR/h (2 sec)
0 mR/h to 50 mR/h (1.8 sec)
0 mR/h to 500 mR/h (1.8 sec)
0 R/h to 5 R/h (1.8 sec)
Accuracy Within 10 % of readings between 10 % and 100 % of full scale indication on any range,
exclusive of energy response
Detector Chamber 230 CC Pressurized ionization chamber to 8 atmospheres or 125 psi
Controls ON/OFF and MODE
Automatic features Auto-zeroing, auto-ranging, and auto-backlight
Warm-up time Less than one minute for initial operation when the instrument is in temperature equilibrium
with the surrounding area, typical. (About four minutes for readings if less than 20 μR/h in a
10 μR/h or less background)
Display LCD analog/
digital with backlight
Analog 100 element bar graph 6.4 cm long. Bar graph is divided into 5 major
segments, each labeled with the appropriate value for the range of
the instrument
Digital 2.5 digit display is followed by a significant zero digit depending on
the operating range of the instrument. The units of measurement are
indicated on the display at all times. Digits are 6.4 mm (0.25 in) high.
Low battery and freeze indicators are also provided on the display
Modes Integrate mode Operates continuously 30 seconds after the instrument has been
turned on. Integration is performed even if the instrument is
displaying in mR/h or R/h
Freeze mode Will place a tick mark on the bar graph display to hold on the peak
displayed value. The unit will continue to read and display current
radiation values
Environmental Temperature range -20 °C to 50 °C (-4 °F to 122 °F)
Relative humidity 0 % to 100 %
Geotropism Negligible
Typical energy
dependence
16
Nitrogen gamma rays are 110 % to 120 % of indicated readings as determined at the
University of Lowell
Power requirements Two 9 V alkaline, 200 hours operation
Dimensions (WxDxH) 10 cm x 20 cm x 15 cm (4 in x 8 in x 6 in)
Weight 1.07 kg (2.4 lb)
2 Fluke Biomedical 451P Pressurized µR Ion Chamber Survey Meter