Graetz GammaTwin Operation Manual
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Graetz GammaTwin Operation Manual

Dose rate meter
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Operation Manual
for the
GRAETZ Dose Rate Meter
GammaTwin
23.51
10.02
Release: October 2017, Software Version 1.4/1.5
Part Number 5641 9877

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Summary of Contents for Graetz GammaTwin

  • Page 1 Operation Manual for the GRAETZ Dose Rate Meter GammaTwin 23.51 10.02 Release: October 2017, Software Version 1.4/1.5 Part Number 5641 9877...
  • Page 2 Operation Manual GammaTwin Software Version 1.4/1.5...

  • Page 3: Table Of Contents

    GammaTwin Operation Manual 1. Inhalt 1. Preface ..............5 2. Introduction ............6 2.1 Possibilities of use ..........6 2.2 Control and display ele men ts ......8 3. Putting into operation ..........9 3.1 Before use ............9 3.2 Switching ON/OFF ..........9 3.3 Indication ............
  • Page 4 Operation Manual GammaTwin 5.1.5 Setting basic display ......... 19 6. Possible defects ............ 20 6.1 Error messages ..........20 6.2 Batteries discharged ......... 20 6.3 Other error messages ........21 6.4 Switching on ............21 7. Disposal of disused devices ........24 8.

  • Page 5: Preface

    Please note: When applied in pulsed radiation fields 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.

  • Page 6: Introduction

    GammaTwin 2. Introduction 2.1 Possibilities of use The GammaTwin is a very robust, reliable and easy to operate PTB-approved dose rate meter. It is used for the safe determination of the current local dose rate as well as the accu- mulated dose of photon radiation.
  • Page 7 GammaTwin Operation Manual The GammaTwin offers the following features: 9 activatable acoustic single-pulse indica- tion 9 activatable acoustic function control 9 4 dose and dose rate alarm thresholds each 9 alternatively either simultaneous or separate indication of dose or dose rate...

  • Page 8: Control And Display Ele Men Ts

    Operation Manual GammaTwin 2.2 Control and display ele men ts privileged direction of irradiation and position of reference point in 12 mm depth LC- display button for ON/OFF and background illumination button for menu and acoustic single-pulse indication screw for battery compartment sound source Software Version 1.4/1.5...

  • Page 9: Putting Into Operation

    Remove the protective foil from the display. 3.2 Switching ON/OFF The GammaTwin is turned on by briefly press- ing the -button. The instrument passes a self- test, in which the user may control the alarm signal and all segments of the display.

  • Page 10: Indication

    Gam- maTwin. 3.3 Indication The user can either select the separate indica- tion of dose and dose rate or the simultaneous indication („Twin“-indication). The dual „Twin“- indication is preset by GRAETZ. Software Version 1.4/1.5...

  • Page 11: Twin"-Indication

    GammaTwin Operation Manual 3.3.1 „Twin“-indication Displayed elements: • bargraph (analog/logarithmic indication of the dose rate) • dose rate • dose • activated dose rate alarm threshold (DRA) • activated dose alarm threshold (DA) • function control (flashing once per second) •...

  • Page 12: Dose Indication

    Operation Manual GammaTwin 3.3.2 Dose indication Displayed elements: • bargraph (shows the dose in per- centages of the activated alarm threshold) • dose • active alarm thresholds (DRA/DA – as shown above) • function control (flashing once per second) •...

  • Page 13: Dose Rate Indication

    Displayed elements: • bargraph (analog/logarithmic indication of the dose rate) • dose rate • measured peak value since switching on the GammaTwin • active alarm thresholds (DRA/DA – as shown above) • function control (flashing once per second) • loudspeaker symbol (when acoustic single-pulse indication is activated) •...

  • Page 14: Single-Pulse Indication And Functional Control Signal

    GM-tube pulse will trigger a sound. Additionally, a functional control signal sounds approx. every two min- utes, indicating the GammaTwin is correctly working. This signal can be combined with both acoustic single-pulse indications. 3.5 Display illumination During operation the display illumination can be turned on by pressing the button .

  • Page 15: Acknowledgement Of Acoustic Alarms

    Then, the acoustic alarm signal is switched off, but the optical warning remains still active. In case of serious errors, the GammaTwin auto- matically switches off after acknowledgement (see chapter 6). Software Version 1.4/1.5...

  • Page 16: Alarm Messages

    Operation Manual GammaTwin 4. Alarm messages 4.1 Dose and dose rate alarm When an activated alarm threshold is exceed- ed, the display is blinking. In case of an exceeded dose alarm threshold, the display switches to the dose indication and in case of an exceeded dose rate alarm threshold to the dose rate indication.

  • Page 17: Battery Alarm

    GammaTwin Operation Manual 4.2 Battery alarm The GammaTwin regularly checks the charge of the batteries. The displayed battery symbol in- dicates the residual capacity. When this signal starts blinking, the batteries have to be repla- ced as soon as possible (please also see chapter 6.2).

  • Page 18: Dose And Dose Rate Alarm Thresholds

    Operation Manual GammaTwin 5.1.2 Dose and dose rate alarm thresholds In these both menus the activated alarm threshold is marked by a hook. By using the button it is possible to scroll through the single alarm thresholds. With the -button the inver- se shown alarm threshold is chosen (black line, white figures) and activated.

  • Page 19: Dose

    GammaTwin Operation Manual in the line „accept“, the setting is taken over and the GammaTwin changes to the next menu point. 5.1.4 Dose In this menu the user can irrevocably clear the accumulated dose by pressing the button . By...

  • Page 20: Possible Defects

    6. Possible defects 6.1 Error messages Each time being switched on, the GammaTwin passes a self-test. Additionally, all important functions are continuously controlled during operation. In case of an error, the user will be informed by a corresponding error message.

  • Page 21: Other Error Messages

    6.3 Other error messages For all other errors the GammaTwin switches off by pressing the button . Switch the GammaTwin on. If the error occurs again, the GammaTwin has to be returned to GRAETZ for repair. 6.4 Switching on • The GammaTwin cannot be switched Control the batteries (sufficient voltage availa- ble?).
  • Page 22 • Instrument doesn‘t work correctly, function control is not blinking, no ent- ries possible when operating the but- tons. Remove the batteries for approx. one minute. If the error occurs again, the GammaTwin is defective and has to be returned to GRAETZ for repair. Software Version 1.4/1.5...
  • Page 23 GammaTwin Operation Manual Remark: During „Twin“- or dose rate indication, the bar- graph doesn‘t correspond to the measured va- lue. This is correct, as the bargraph shows a mi- nor smoothed measured value than the digital indication. Thus, tendencies can be recognized more quickly.

  • Page 24: Disposal Of Disused Devices

    Disused devices do not be- long to residual waste. GRAETZ Strahlungsmeßtechnik GmbH takes your old device back free of charge and cares for its skilled dis- posal.

  • Page 25: Technical Data

    Operation Manual 8. Technical data Kind of dosemeter portable dose rate meter with built-in Geiger-Müller tube GM-tube type 70019A Type GRAETZ GammaTwin Manufacturer GRAETZ Strahlungsmeßtechnik GmbH Westiger Straße 172 D-58762 Altena/Germany Kind of radiation Gamma and X-rays (for DC-installa- tions only, not suitable for pulsed...
  • Page 26 Operation Manual GammaTwin Angle of incidence ± 45° referred to the reference orientation of incident radiation Normal position horizontal, reading from above Dimensions of the detector 46 mm, ø 19 mm (effective length 39 mm) Position of the detector inside the device...
  • Page 27 GammaTwin Operation Manual Dose rate alarm thresholds 7.5 µSv/h 25 µSv/h 40 µSv/h 300 µSv/h Dose alarm thresholds 200 µSv 500 µSv 1000 µSv 2000 µSv Coefficient of variation ≤15% (see figure 1) depending on the dose rate Linearity of dose rate indica- ±10%...
  • Page 28 1.5 with check sum 5958 REMARK: It is possible that the alarm signal is not sufficient extremely loud working environments. The alarm thresholds are preset by GRAETZ. Upon request, any value within the mea- suring range can be set by GRAETZ. Software Version 1.4/1.5...
  • Page 29 GammaTwin Operation Manual Software Version 1.4/1.5...
  • Page 30 Operation Manual GammaTwin Fig. 1 (page 29) shows the diagram „energy and angle dependence as a function of the respon- se“ (indicated value/real value) for different ra- diation energies. Red curve: incident radiation in the preferred direction Green/blue curve: 45° angle referred to the incident radiation...

  • Page 31: Repair And Maintenance

    GammaTwin Operation Manual 9. Repair and maintenance GRAETZ Strahlungsmeßtechnik GmbH Westiger Straße 172 D-58762 Altena/Germany Phone: +49-2352-70070 Fax: +49-2352-700710 E-Mail: info@graetz.com further information about GRAETZ Strahlungsmeßtechnik GmbH and our products please visit our website under: http://www.graetz.com Software Version 1.4/1.5...
  • Page 32 Operation Manual GammaTwin Software Version 1.4/1.5...

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