Tenmars TM-91N Bedienungsanleitung

RADIATION METER

TM-91N

HB2TM91N0001

TENMARS ELECTRONICS CO., LTD

EN-2

CONTENTS

1. introduction .............................................3

2. Safety Precaution....................................4

3. Specification............................................6

4. Identifying parts.......................................7

5. Operation Procedure ..............................7

6. Battery Replacement ............................11

7. NOTICE ............................................... 12

8. Interaction of radiation with matter....... 13

9. End of life............................................. 15

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1. INTRODUCTION

This manual contains valuable information about

the nature of ionizing radiation that should be

understood by the user so that accurate

measurements can be made. Information on the

care of your Geiger counter is also included. If the

following instructions are followed, your radiation

monitor will give you many years of reliable

service.

The radiation meters are very sensitive pieces of

equipment. Although housed in a high –impact

case, the Geiger-Mueller tube that senses

radiation is fragile. If the unit is dropped, the G-M

tube may break. Exposure of the unit above 40℃

(100℉) may also cause the G-M tube to stop

functioning.

The electronic circuitry is sensitive to high

humidity(over 90%RH).

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2. SAFETY PRECAUTION

CAUTION

Take extremely care for the following

conditions while measuring

CAUTION

Please put the radiation monitor into a

plastic zipper bag before operating it

in a radiative contaminated area to

avoid radiative dust falling on the

monitor’s surface

Do not operate the meter under the

environment with explosive gas (material),

combustible gas (material) steam or filled

with dust.

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Do NOT put the unit in a very hot place(such

as a car, glove box, especially during

summer).

Do NOT allow the unit to get wet. However,

if it cannot be avoided, clean it with a towel

and allow unit to air-dry for several days(do

not place in an oven or microwave).

Do NOT back cover to bemoved only by

qualified service technician.internal

operating voltage is over 400VDC.

In order to avoid reading incorrect data,

please replace the battery immediately

when the symbol “ ” appears on the

LCD.

In order to avoid the damage caused by

contamination or static electricity, do not

touch the circuit board before you take any

adequate action.

Operating Environment: Indoors use. This

instrument has been designed for being

used in an environment of pollution degree 2.

Operation Altitude: Up to 2000M.

Operating Temperature & Humidity: 5℃~40

℃, 0%~ 80%RH.

Storage Temperature & Humidity: -10℃~

50℃, 0%~ 70%RH.

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3. SPECIFICATI

Display : 3 1/2 digits LCD with maximum

reading 1999.

Sampling :

10 second/ times(<20µSv/h).

1 second/ times(>20µSv/h)

unit selection :

µSv/h,µRem/h or mRem/h .

Measurement Range :

0.50µSv/h~1400µSv/h or

50µRem/h~140.0mRem/h

Alarm function : alarm set default

0.50µSv/h,can set 0~19.99µSv/h

Auto Power Off function : set time default

30 min, can set 0~60min;0 min disable auto

power off.

Low battery indication “”.

Power : 9V battery、NEDA 1604、IEC

6F22 or JIS 006P

Battery Life : About 50 hours(Alkaline

battery).

Over load display “OL”

Accuracy : ±20% (Cesium-137)

Energy dependency : 30KeV to 1.3 Mev

Weight : 220g.

Size : 143x74 x34 mm（LxWxH）

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4. IDENTIFYING PARTS

1. LCD display.

2. Setup function button.

3. Units and setup function down button.

4. Power ON / OFF button.

5. Unit and setup function up button.

5. OPERATION PROCEDURE

Press : All segment of the LCD

indicator is illuminated together with

BEEP signal for about two second. We

are now ready for testing.

Intermittent BEEP signal follows during

detection,auxliary radiation strength

sensing. The higher the repetition rate.

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Press : Select test unit µSv/h

Press : Select test unit µRem/h.

Press r more than 1 second to enter

setting alarm mode , the LCD display

“ALR”first the press the setting value, press

the ””or ””change the digit

value, Alarm the initial value 0.5µSv/h.

Press more than 1 second to enter

setting auto power-off(APO), the LCD

display “APO”first the setting value, press

the ””or ””change the digit

value, Auto power-off setting, the initial

value is 30 minutes.

Press more than 1 second to enter

setting buzzer ON or OFF ,the setting

default is always “ON”, the LCD display

“ON”or ”OFF”,press””or ””

change the ON or OFF.

Press more than 1 second to enter

setting calibration facfor, the LCD display

“CF”first the setting value,

press ””or ””change the digit

value, Calibration facfor the initial value

1.00.

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Press more than 1 second to exit

and return to measurment mode.

The Geiger-mueller tube is located behind

the slots in the upper edge of the case. The

surface of the tube is very thin .This allows

beta radiation to penetrate and to be

detected with greater efficiency. (Beta rays

and other types of radiation will be

discussed in the next section). This thin

surface is fragile and poking sharp objects

through the slots will damage the tube.

Your Geiger Counter is designed to be

sensitive to:

1. Gamma radiation (which includes X-rays).

2. Beta radiation.

Gamma radiation and X-rays can

penetrate the plastic case with

comparative ease.

Beta radiation can most efficently enter

the case through the slots. Although Beta

radiation is easily detected. It is difficult to

measure accurately. Therefore, when a

radioactive object is being searched for

Beta radiation, the open slots in the case

should be positioned in such a way that

TM-91N

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they are exposed to the object(see Figure

1).

(Figure 1)

If the unit shows a significantly higher

reading with increasing beep sound volume

in this position, you can be certain that the

object is emitting Beta radiation.

Now position the unit as shown in Figure 2.

In this position, where radiation cannot pass

directly through the slots (Beta radiation

travels in straight lines for the most part )

only gamma and X-ray radiation from the

object wil be detected.

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