Tenmars TM-91N User Manual

RADIATION METER

TM-91N

HB2TM91N0001

TENMARS ELECTRONICS CO., LTD

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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

TM-91N

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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).

TM-91N

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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.