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

1.2

Indicated/Actual

1.1

1

0.9

0.8

0.7

0.6

451P typical energy dependence

Side

Face

Front

Ordering
Information

Models

451P-RYR Pressurized µR Ion
Chamber Survey Meter with
standard chamber

451P-RYR-SS Pressurized µR
Ion Chamber Survey Meter
with molded grip handle and

0.5

0.4

0.3

0.2

Effective (keV)

00001000100101

shoulder strap

Optional accessories

451EX L 451 Assistant for
Excel, includes RS-232
interface cable

190 HPS Single Unit
Carrying Case

62 -10 3 Check Source,

137

Cs, 10 µCi. Flat disc,

1-inch diameter

**Due to the pressurized ion chamber,
the 451P is considered U.S. Department
of Transpor tation (DOT) Dangerous Goods
and must be shipped via IAW DOT special
permit DOT-SP 13187.

About Fluke Biomedical

Fluke Biomedical is the world’s leading manufacturer of quality
biomedical test and simulation products. In addition, Fluke Biomedical
provides the latest medical imaging and oncology quality-assurance
solutions for regulatory compliance. Highly credentialed and equipped
with a NVLAP L ab Code 200566- 0 accredited laboratory,
Fluke Biomedical also offers the best in quality and customer
service for all your equipment calibration needs.

Today, biomedical personnel must meet the increas ing
regulatory pressures, higher quality standards, and rapid
technological growth, while performing their work faster and more
efciently than ever. Fluke Biomedical provides a diverse range
of sof tware and hardware tools to meet today’s challenges.

Fluke Biomedical Regulatory Commitment

As a medical test device manufacturer, we recognize and follow certain
quality standards and certications when developing our products. We
are ISO 9001 and ISO 13485 medical device certied and our products are:

•  CE Certied, where required

•  NIST Traceable and Calibrated

•   UL, CSA, ETL Certied, where required

•  NRC Compliant, where required

3 Fluke Biomedical 451P Pressurized µR Ion Chamber Survey Meter

Fluke Biomedical.

Better products. More choices. One company.

Fluke Biomedical

6045 Cochran Road
Cleveland, OH 44139-3303 U.S.A.

Fluke Biomedical Europe

Science Park Eindhoven 5110
5692EC Son, The Netherlands

For more information, contact us:

In the U.S.A. [phone] or
Fax [phone]
In Europe/M-East/Africa [phone] or
Fax [phone]
From other countries [phone] or
Fax [phone]
Email: sales@flukebiomedical.com
Web access: www.flukebiomedical.com

©2007-2013 Fluke Biomedical. Specifications subject
to change without notice. Printed in U.S.A.
8/2013 3948032D_EN

Modification of this document is not permitted
without written permission from Fluke Corporation.