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PTW DIAMENTOR E Instruction Manual

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(01/98)
Ra/ri (15113100.Gbe)
(
* PTW-Freiburg
FAX
Loerracher Straße 7
E-Mail
D-79115 Freiburg
Instruction manual
DIAMENTOR E
[D151.131.0/2]
(+49) 761-490550
(+49) 761-49055-70
PTW@PTW.DE
Registergericht Freiburg
HRB NR. 1673
Geschäftsführer:
Dr. Edmund Schüle,
Dr. Christian Pychlau

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  • Page 1 Instruction manual DIAMENTOR E [D151.131.0/2] (01/98) Ra/ri (15113100.Gbe) * PTW-Freiburg (+49) 761-490550 Registergericht Freiburg Geschäftsführer: Loerracher Straße 7 (+49) 761-49055-70 HRB NR. 1673 Dr. Edmund Schüle, E-Mail D-79115 Freiburg PTW@PTW.DE Dr. Christian Pychlau...
  • Page 2 • PTW-Freiburg cannot be held liable for damages • The product is a medical device. Only person resulting from the use of accessories or with sufficient knowledge and skill may use the consumables from other manufacturers.

  • Page 3: D151.131

    Instruction Manual - 3 - Security Information DIAMENTOR E [D151.131.0/3] Operation in the patient environment Never touch the patient and open connectors of the • The product represents a medical system. The device at the same time. product may be operated in the patient environment.

  • Page 4: Table Of Contents

    C o n t e n t s Page: 1 Introduction ..........................5 2 Connecting the DIAMENTOR E to the Mains ..............6 3 Description of the DIAMENTOR E..................7 4 Description and Mounting of the Ionization Chamber............8 5 Connection and Care of the Ionization Chamber..............9 6 Adjusting the DIAMENTOR E ....................10...

  • Page 5: Introduction

    The DIAMENTOR E complies with the rules laid down in the German regulation DIN 6819. The working principle of the DIAMENTOR E is based on the fact that X-rays inside the special DIAMENTOR ionization chamber produce a well defined amount of charge during the time of exposure.

  • Page 6: Connecting The Diamentor E To The Mains

    1). For a mains voltage of 115 V AC it is recommended that the PTW power supply T99021 or T99008 is used. For a mains voltage of 230 V AC, it is recommended that the PTW power supply T99009 or T99008 is used.

  • Page 7: Description Of The Diamentor E

    A detailed description of this subject is given in chapters 6 and 7 of this manual. If the high voltage is not sufficient or missing at all, the DIAMENTOR E shows a colon between the second and third and between the third and fourth digit of the display. This also happens immediately after switching on the DIAMENTOR E until the high voltage has reached its final value.

  • Page 8: Description And Mounting Of The Ionization Chamber

    DIN 6863 part 2. Further information about the ionization chambers can be extracted from the data sheets. The ionization chamber is connected to the DIAMENTOR E via cable type K3S. This cable has an inner conductor which is connected to the collecting electrode, a first inner shield connected to the guard potential, a second little shield connected to the polarizing voltage of + 500 V and a third outer shield connected to earth.

  • Page 9: Connection And Care Of The Ionization Chamber

    [D151.131.0/3] 5 Connection and Care of the Ionization Chamber The connection between the ionization chamber and the DIAMENTOR E is performed by the cable T26004. This is a special cable with cable core and three concentric shieldings. The metal parts of plug and socket are connected to the outer shielding which has mass potential. When installing the cable, it must be sure that plug and socket of the cable do not touch metallic parts of the X-ray machine, to avoid current loops.

  • Page 10: Adjusting The Diamentor E

    The DIAMENTOR E is calibrated in the factory. During this calibration the ionization chamber gets a chamber factor K G . The DIAMENTOR E itself gets a characteristic factor Q T . The product of these two factors gives the check reading n c : n c = Q T ⋅...
  • Page 11 100 cm). A reference dosemeter should be placed in the reference plane. A comparison of the dose area product as indicated by the DIAMENTOR E with that calculated from the reference dosemeter (dose times area) should then be made at a range of set kVp values across the normal operating range of the X-ray unit.

  • Page 12: Checking The Stability

    This amount of charge is constant within ± 1 %. If the sensitivity of the DIAMENTOR E has not changed, the check reading n c must also be constant. If it is not (i.e. the check reading deviates by more than ± 5 % from that check reading calcu- lated with the values in the test certificate), a calibration according to chapter 6 should be per- formed.

  • Page 13: Further Information

    8 Further Information 8.1 Influence of Air Temperature and Humidity As long as the DIAMENTOR E is used in the range + 10 °C to + 40 °C, the response changes by less than ± 5 %. If the DIAMENTOR E is used in environments with high humidity (for example 30 °C, 75 % relative humidity), a film of moisture might cover parts of the instrument or chamber and can cause an increase of the leakage current (see chapter 8.2).

  • Page 14: Wall Mounting

    Please make sure that the maximum distance between the wall and the head of the screw is 6 mm. Now you can slide the DIAMENTOR E over the screws through the holes in the rear of the instrument. The DIAMENTOR E is finally fixed by now sliding it a little bit downwards.

  • Page 15: Time Schedule For Regular Checks

    [D151.131.0/3] 9 Time Schedule for regular Checks The proper function of the DIAMENTOR E can be checked with the help of the test button (picture 3, 3) and by a calibration according to chapter 6 of this instruction manual. It is recommended to perform the check with the test button regularly (especially if there are hints concerning changed or irregular measuring results).

  • Page 16: Technical Data

    Instruction Manual - 16 - Technical Data DIAMENTOR E [D151.131.0/3] 10 Technical Data Device designation and use: DIAMENTOR E type 11002 dose area product meter according to IEC 580 for measurements in diagnostic radiology Manufacturer: PTW-Freiburg Mode of operation: Continuous operation Electrical Resolution: (0.4 ...
  • Page 17 Instruction Manual - 17 - Technical Data DIAMENTOR E [D151.131.0/3] Chamber: PTW type B, type no. 57523 Filtration of the chamber: equivalent to 0.2 mm Al Transparency of the chamber: > 70 %...

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