Graetz GammaTwin User manual
Operaon Manual
for the
GRAETZ Dose Rate Meter
GammaTwin
Release: October 2017, Soware Version 1.4/1.5 Part Number 5641 9877
23.51
10.02
Soware Version 1.4/1.5
GammaTwinOperaon Manual
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GammaTwin
Soware Version 1.4/1.5
Operaon Manual
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1. Inhalt
1. Preface .................................................................... 5
2. Introducon ............................................................ 6
2.1 Possibilies of use ............................................... 6
2.2 Control and display ele men ts ............................. 8
3. Pung into operaon ............................................. 9
3.1 Before use ........................................................... 9
3.2 Switching ON/OFF ............................................... 9
3.3 Indicaon .......................................................... 10
3.3.1 „Twin“-indicaon .................................... 11
3.3.2 Dose indicaon ........................................ 12
3.3.3 Dose rate indicaon ................................ 13
3.4 Single-pulse indicaon and funconal control
signal ............................................................... 14
3.5 Display illuminaon .......................................... 14
3.6 Acknowledgement of acousc alarms .............. 15
4. Alarm messages .................................................... 16
4.1 Dose and dose rate alarm ................................. 16
4.2 Baery alarm .................................................... 17
5. The menu .............................................................. 17
5.1 Acvate the menu ............................................. 17
5.1.1 Menu operaon ....................................... 17
5.1.2 Dose and dose rate alarm thresholds ...... 18
5.1.3 Acouscs .................................................. 18
5.1.4 Dose ......................................................... 19
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5.1.5 Seng basic display ................................. 19
6. Possible defects .................................................... 20
6.1 Error messages .................................................. 20
6.2 Baeries discharged ......................................... 20
6.3 Other error messages ....................................... 21
6.4 Switching on ...................................................... 21
7. Disposal of disused devices .................................. 24
8. Technical data ....................................................... 25
9. Repair and maintenance ....................................... 31
GammaTwin
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Operaon Manual
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1. Preface
To guarantee a faultless handling of the dose
rate meter GRAETZ GammaTwin, please read
the following operaon manual carefully.
Aer having inserted the baeries and swit-
ched on the instrument, the user can immedi-
ately start measurement of ionizing radiaon.
Please note: When applied in pulsed radiaon
elds the measuring results of the GammaTwin
are not reliable as measurements are based on
Geiger-Müller-tube technology. Thus, it is not
suitable for pulsed X-rays.
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2. Introduction
2.1 Possibilies of use
The GammaTwin is a very robust, reliable
and easy to operate PTB-approved dose rate
meter. It is used for the safe determinaon of
the current local dose rate as well as the accu-
mulated dose of photon radiaon. The measu-
rands are the ambient dose equivalent rate
Ḣ*(10) as well as the ambient dose equivalent
H*(10).
The ambient dose equivalent rate Ḣ*(10) as
well as the ambient dose equivalent H*(10) are
PTB-approved.
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The GammaTwin oers the following features:
9acvatable acousc single-pulse indica-
on
9acvatable acousc funcon control
94 dose and dose rate alarm thresholds
each
9alternavely either simultaneous or
separate indicaon of dose or dose rate
9automac and connuous storage of
the dose
9simple menu navigaon
9illuminable display
9measured peak value of dose rate since
switching on the GammaTwin
3
6
4
5
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2.2 Control and display elements
1 privileged direcon of irradiaon
and posion of reference point in
12 mm depth
2 LC- display
3 buon for ON/OFF and background
illuminaon
4 buon for menu and acousc
single-pulse indicaon
5 screw for baery compartment
6 sound source
1
2
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Operaon Manual
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3. Putting into operation
3.1 Before use
Before starng the instrument the user has to
ensure that the GammaTwin is not damaged
and is correctly equipped with two baeries of
the type AAA 1,5 V (polarity acc. to the corres-
ponding label). For perfect contacng, please
ghten the screw of the baery compartment
by means of a coin. Remove the protecve foil
from the display.
3.2 Switching ON/OFF
The GammaTwin is turned on by briey press-
ing the -buon. The instrument passes a self-
test, in which the user may control the alarm
signal and all segments of the display. Further-
more, the serial number, the soware version
as well as the check sum of the soware are
displayed. The PTB-approved version of the
rmware and the corresponding check sum are
indicated in chapter 8 (technical data). If there
is no error, the GammaTwin is directly starng
operaon.
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When pressing the buon for more than 2
seconds during operaon, the instrument is
switched o and the following safety check will
appear:
All acve sengs and the acousc single pulse
indicaon will be stored. An acvated acousc
alarm or acousc error messages have to be
acknowledged before switching o the Gam-
maTwin.
3.3 Indicaon
The user can either select the separate indica-
on of dose and dose rate or the simultaneous
indicaon („Twin“-indicaon). The dual „Twin“-
indicaon is preset by GRAETZ.
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