Sper scientific 840024 Manuel utilisateur

Digital Radiation

Meter

840024

Instruction Manual

- 2 -

Digital Radiation Meter 840024

Printed in the USA

7720 E. Redfield Rd. Suite #7,

Scottsdale, AZ 85260

Tel: (480) 948-4448 Fax: (480) 967-8736

Web: www.sperscientific.com

The contents of this manual may not be

reproduced or transmitted in any form or

by any means electronic, mechanical, or

other means that do not yet exist or may

be developed, including photocopying,

recording, or any information storage

and retrieval system without the express

permission from Sper Scientific.

- 3 -

TABLE OF CONTENTS

INTRODUCTION. . . . . . . . . . . . . . . . . . . .

CAUTION . . . . . . . . . . . . . . . . . . . . . . . . .

KEYPAD . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATING PROCEDURES . . . . . . . . .

METER SETUP . . . . . . . . . . . . . . . . . . . .

ESTABLISHING BACKGROUND

LEVELS . . . . . . . . . . . . . . . . . . . . . . . . . .

AREA MONITORING . . . . . . . . . . . . . . . .

CHECK SURFACE CONTAMINATION . .

CHECK AN OBJECT . . . . . . . . . . . . . . . .

MAINTENANCE AND CALIBRATION . . .

RADIATION AND RADIOACTIVITY . . . . .

SPECIFICATIONS . . . . . . . . . . . . . . . . . .

WARRANTY . . . . . . . . . . . . . . . . . . . . . . .

NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . .

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This manual provides the necessary

information for proper use and care of

Sper Scientific Model 840024 Radiation

Meter. We recommend reading this

manual completely prior to using the

instrument. It also contains valuable

information about the nature of ionizing

radiation that should be understood by

the user so that accurate measurements

can be made.

This Radiation Meter features selectable

measurement scales, adjustable audible

alarm and auto power off. It uses a thin

wall glass Geiger-Mueller (GM) tube that

will detect Beta and Gamma ionizing

radiation and X-rays. The GM tube

generates an electrical pulse each time

radiation passes through the tube.

These pulses are then electronically

detected and displayed in either SI units

(micro-sieverts per hour) or conventional

units (milliroentgens per hour).

INTRODUCTION

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Although housed in a high-impact

case, the Geiger-Mueller tube that

senses radiation is fragile and may

break If the unit is dropped, exposed

to high temperature (above 122°F/50°

C) and/or high humidity (over 90%

RH).

x Do not allow surface of housing to

come in direct contact with

radioactive contamination

x Do not leave meter in

temperatures above 122°F (50°C)

x Do not expose to wet or high

humidity conditions

x Do not place meter in a microwave

oven

x Do not remove back cover

x Replace battery when is

displayed

CAUTION

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KEYPAD

1. 3.5 Digit LCD display

2. setup function button

3. (T2) and setup function down button

4. Power ON / OFF button

5. (T1) and setup function up button

- 7 -

1. Press the button. The meter

performs a system check and

displays all indicators for

approximately two seconds together

with a Beep signal. When in use,

the instrument will emit a “chirping”

sound that increases in rate

according to the radiation intensity.

2. When powered on, the

measurement scale will default to

Micro-Sieverts per hour (T1).

Press the button to change

the measurement scale to

milliroentgens per hour (T2).

3. Hold the meter as shown on page

12 for detecting Beta radiation. Hold

the meter as shown on page 13 for

detecting gamma and x-ray

radiation.

OPERATING

PROCEDURES

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1. To change the factory set alarm

level of 0.5 μSv/h press and release

the button. “ALA” appears in

the display followed by the alarm

set point. Press the Ÿor źarrows

to change the alarm point anywhere

in the range of 0 ~ 199.9 μSv/hr. It

is only necessary to set the alarm in

the range. The meter will

automatically select the

corresponding value for the

range. Once selection is made

press and release the button.

2. To change the 30 minute Auto

Power Off default press and release

the button until “APO”

appears in the display followed by

the current value in minutes. Press

the Ÿor źarrows to change the

Auto Off setting to anytime from 0 ~

60 minutes (selecting 0 will defeat

METER SETUP

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1. the Auto Off function). Once

selection is made press and release

the button.

3. To cancel or restore audible

chirping press and release the

button. The current setting will be

displayed (either “ON” or “OFF”).

Press the Ÿor źarrows to change

the setting. Selecting “OFF”

silences audible chirping. Once

selection is made press and release

the button to return to the

measurement screen.

METER SETUP

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There is always naturally occurring

radiation around us, which is categorized

as background radiation. The radiation

levels vary at different locations and at

different altitudes. To attain the highest

degree of accuracy from this instrument a

background reading should be established

for each location being monitored. This

can be accomplished by taking an

unshielded reading or by shielding the

meter with a 0.5” thick lead barrier on all

sides. The following procedure can be

used to obtain a background level:

1. Press the button

2. Select measurement scale: or

3. Take a 5 minute reading

4. Maintain this reading for future

reference

5. Repeat this procedure each time meter

is moved to a different location

ESTABLISHING

BACKGROUND LEVEL

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