Atec Fluke-451P User Manual
451P
Pressurized µR Ion Chamber Survey Meter
The 451P state-of-the-art ion chamber survey
meter is a handheld battery operated unit
designed for use in both rugged and normal
environments. The 451P is a pressurized ion
chamber for μR resolution. The 451P auto-ranges
and measures radiation rate and accumulated
dose from various radiation sources (beta, x-ray
and gamma). The ion chamber detector allows
for a fast response time to radiation from leakage,
scatter beams, and pinholes. Additionally, the
low-noise chamber bias supply provides for fast
background-settling time.
The digital display features an analog bar graph,
2.5 digit readout, low battery indicator, freeze
(peak hold) mode indicator and an automatic backlight function. User controls consist of an ON/OFF
button and a MODE button. The case is constructed
of lightweight, high strength materials and is
sealed against moisture.
The RS-232 interface can be connected directly
to a computer for use with the Excel add-in for
Windows (451EXL), enhancing the functionality
of the instrument. This software allows for data
retrieval, user parameter selection and provides a
virtual instrument display with audible and visual
alarm indication.
Technical Data
Key features
• High µR sensitivity measurement of rate and dose simultaneously
• Records peak rate using “Freeze Mode”
• Auto-ranging and auto-zeroing
• RS-232 communications interface with optional Windows-based Excel add-in for
data logging
• Ergonomic, anti-fatigue handle with replaceable grip, wrist strap and tripod mount
• Programmable flashing LCD display
• Easily-accessible battery door (operated by two 9-volt alkaline batteries) on the
outside of the bottom case
• Available with dose equivalent energy response (SI units)
Specifications
Radiation detected Beta > 1 MeV
Gamma > 25 keV
Operating ranges,
response time
Accuracy Within 10 % of readings between 10 % and 100 % of full scale indication on any range,
Detector Chamber 230 CC Pressurized ionization chamber to 8 atmospheres or 125 psi
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
Display LCD analog/
digital with backlight
Modes Integrate mode Operates continuously 30 seconds after the instrument has been
Environmental Temperature range -20 °C to 50 °C (-4 °F to 122 °F)
Typical energy
dependence
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)
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)
exclusive of energy response
Controls ON/OFF and MODE
with the surrounding area, typical. (About four minutes for readings if less than 20 μR/h in a
10 μR/h or less background)
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
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
Relative humidity 0 % to 100 %
Geotropism Negligible
16
Nitrogen gamma rays are 110 % to 120 % of indicated readings as determined at the
University of Lowell
2 Fluke Biomedical 451P Pressurized µR Ion Chamber Survey Meter
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