Fluke-biomedical 451P User Manual download pdf (Page 11)

Introduction

The Model 451P Ion Chamber Survey Meter (the Survey Meter) is a hand-held,

pressurized, battery operated meter designed to measure gamma and x-ray

radiation above 25 keV, and beta radiation above 1 MeV, using the latest CMOS

and LCD technology. The Survey Meter case is constructed of high strength ABS

plastic. A gasket seals moisture out of the Survey Meter and provides a cushion

for the internal components. The readout consists of a 2½ digit liquid crystal

display and a 100 segment analog bar graph. The bar graph contains a zero

segment and twenty groups of five segments each. A permanent scale is located

on the display screen. The major divisions of the scale indicate the units

corresponding to the range that the meter is measuring. The units of

measurement show next to the 2½ digit display. LOW BAT and FREEZE appear

on the display when the Survey Meter is operating in these modes. External

controls consist of an ON/OFF button and a MODE button. The Survey Meter is

auto-ranging and auto-zeroing. The auto-on circuit for the backlight is enabled

when twilight conditions occur. An internal factory-set alarm blinks the display if

the rate exceeds 5 R/hr. Two 9 volt batteries, located in the rear of the Survey

Meter, provide over 200 hours of continuous operation.

Intended Use

The 451P Ion Chamber Survey Meter is a hand-held, pressurized, battery

operated unit designed to measure gamma and x-ray radiation above 25 keV and

beta radiation above 1 MeV.

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Fluke-biomedical 451P User Manual Page 11