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MGP DMC 2000S User Manual

Electronic dosimeter
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DMC 2000S
DMC 2000S
Electronic Dosimeter
User's Manual
Document # 15-00007
Revision 1
May 2001

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Summary of Contents for MGP DMC 2000S

  • Page 1 DMC 2000S DMC 2000S Electronic Dosimeter User’s Manual Document # 15-00007 Revision 1 May 2001...
  • Page 2 DMC 2000S Dosimeter REVISION LOG: DMC 2000S Electronic Dosimeter User’s Manual Date Revised Comments Revision # Pages 10/21/98 Original MGPI document # 15-00007, based upon MGPSA document # 115170AA 05/01/01 Revised for new firmware version of DMC 2000 Page 20 Moved ‘SAT’...

  • Page 3: Table Of Contents

    DMC 2000S Dosimeter TABLE OF CONTENTS General Document overview Contents 6 Direct access to information Conventions Illustrations Operating modes of the DMC 2000S dosimeter Operating Mode 2.1.1. Autonomous mode 2.1.2. Satellite mode Dosimeter function mode 2.2.1. Dosimeter storage mode 2.2.2.
  • Page 4 DMC 2000S Dosimeter 6.2.2. Dose equivalent saturation 6.2.3. Displaying the dose rate measurement 6.2.4. Dose rate saturation 6.2.5. Fault and alarm indicators 6.2.6. Viewing alarm thresholds Switching to pause mode Operation in the pause mode 6.4.1. Normal display 6.4.2. Operation of the selector button Alarms 7.1.1.
  • Page 5 DMC 2000S Dosimeter 12.6 Link to LDM 2000 reader 12.7 Storage Replacement parts Appendix 1: connector for teledosimetry, alarm transmission or external probe Glossary 15-00007 Page 5 of 65...
  • Page 6 This section describes the start-up procedures for the dosimeter. ! Operation of the DMC 2000S in the satellite mode This section details the normal conditions of use for the DMC 2000S as part of a dosimetry system. ! Operation of the DMC 2000S in autonomous mode...
  • Page 7 DMC 2000S Dosimeter This section describes the use of a DMC 2000S in a “stand-alone” mode, independent of any peripheral reader. ! The alarming functions of the DMC 2000S This section describes the different operating modes of the audible and visual alarms.

  • Page 8: Direct Access To Information

    2000S dosimeter. To assist the user in understanding the dosimeter’s operation, a glossary of terms has been provided at the end of the document that describes acronyms, abbreviations and terminology typically associated with the DMC 2000S. 1.4 Conventions Use of typographical symbols: Symbols “...

  • Page 9: Operating Modes Of The Dmc 2000S Dosimeter

    2.1.2. Satellite mode This mode allows the DMC 2000S to be used as a part of a dosimetry system, which includes other equipment and software (LDM 2000, MGPAC, Sentinel etc.). 2.2 Dosimeter function mode Regardless of its operating mode (“autonomous” or “satellite”), the DMC 2000S...

  • Page 10: Pause Mode

    The user’s (display) area of message 22 has been reduced from 14 to 12 bits. Those sites using their own access control software may need to make modifications to the program in order to integrate the DMC 2000S into their system. Please contact MGPI for more information.

  • Page 11: Description

    DMC 2000S Dosimeter 3. Description 3.1 Front view display indicator light selector button detector location ISO connector for the CTM 2000, MUX 2000, AM 16, DDC 16 and PEA 20000 speaker 3.2 Back view pocket clip battery cover 15-00007 Page 11 of 65...

  • Page 12: Display

    DMC 2000S Dosimeter 3.3 Display The dosimeter’s top-mounted display allows viewing of measurements and alarms. indicator light display area In the example shown below the display indicates a dose alarm (i.e. the alarm threshold programmed into the dosimeter for the dose...

  • Page 13: Start-Up

    DMC 2000S Dosimeter 4. Start-up To start up a DMC 2000S dosimeter, the following procedures must be performed: it must be initialized (i.e. switched from storage mode to pause mode) it must be configured (i.e. programmed for alarm threshold values, dose rate display authorization, alarm rate authorization, alarm duration, etc.)

  • Page 14: Operation In The Satellite Mode

    Operation in the satellite mode 5.1 Switching to measurement mode Switching to the measurement mode implies activating the DMC 2000S dosimeter to measure the wearer’s dose equivalent. In a centralized dosimetry system, switching to the measurement mode is accomplished when passing by an LDM 2000 access control reader.
  • Page 15 DMC 2000S Dosimeter 5.2.2. Dose equivalent saturation When the dose equivalent exceeds the value 999.9 Rem (9999.99 mSv), the display reads as shown below. This indicates that the dosimeter has become saturated and must be reset by the appropriate reader / software.
  • Page 16 DMC 2000S Dosimeter 5.2.5. Fault and alarm indicators In the event of a fault or an alarm, additional messages alternate on the display every 2 seconds (see the example of an alarm below): If authorized, the alarm can be acknowledged by pressing the selector button.
  • Page 17 DMC 2000S Dosimeter 5.2.6.2. Rate alarm threshold display This value corresponds to the alarm threshold of the dose rate for the main measurement. The display is shown in scientific notation. In the example above, the value of the rate corresponds to 0.990 mRem/h (9.90 * 10...

  • Page 18: Switching To Pause Mode

    DMC 2000S Dosimeter Switching to pause mode Switching to the pause mode implies deactivating the DMC 2000S dosimeter. In other words, suppressing the dose measurement functions. In a centralized dosimetry system, switching to the pause mode is accomplished when passing by an LDM 2000 access control monitor.

  • Page 19: Operation In The Pause Mode

    5.3 Operation in the pause mode 5.3.1. Normal display When the DMC 2000S dosimeter is in the pause mode, it continuously performs the operations described on page 10. The display shows the message “ PAUSE ” or “ affect ” (or wearer’s name) is depending on whether or not it is assigned.
  • Page 20 5.3.2. Operation of the selector button Using the selector button in the satellite mode allows additional information to be viewed on the DMC 2000S dosimeter’s display. This data and the corresponding displays are described below. Depending on the dosimeter’s configuration, some data can be intentionally concealed.
  • Page 21 DMC 2000S Dosimeter 5.3.2.3. Rate display This data corresponds to the maximum dose equivalent rate for the main measurement during the last time period in the measurement mode. The display is shown in scientific notation. In the example above, the value of the rate corresponds to 208 mRem/h (2.08 * 10...
  • Page 22 DMC 2000S Dosimeter 5.3.2.7. Time alarm threshold display This value corresponds to the time alarm threshold (shown here: 94 hours). 5.3.2.8. Dose pre-alarm warning threshold display This value corresponds to the pre-alarm threshold of the dose equivalent for the main measurement (shown here: 1 mRem).

  • Page 23: Pass-By" Reading

    DMC 2000S Dosimeter 5.3.2.10. Audible alarm operating mode display This value corresponds to the function, which indicates the ambient rate to the user by an audible signal, which is independent of the display: “ BEEP.0 ” : no audible signal for dose increments “...

  • Page 24: Operation In The Autonomous Mode

    6. Operation in the autonomous mode 6.1 Switching to the measurement mode Switching to the measurement mode implies activating the DMC 2000S dosimeter. In other words, programming the dose equivalent measurement. It is performed from the pause mode, as explained below.

  • Page 25: Operation In The Measurement Mode

    6.2 Operation in the measurement mode 6.2.1. Displaying the dose equivalent measurement When in the measurement mode, the DMC 2000S dosimeter continuously measures the Hp (10) dose equivalent, as well as performing other operations (see section 2.2.3, Measurement mode, page 10).
  • Page 26 The unit, format (fixed or floating point) and display resolution are selected during dosimeter configuration. After this 30 seconds, the dose equivalent value is then displayed again: Note: The DMC 2000S may be configured to display other combinations of dose / rate, using DOSIMASS software. Please contact MGPI for details. 6.2.4.
  • Page 27 DMC 2000S Dosimeter 6.2.5. Fault and alarm indicators In the event of a fault or an alarm, additional messages alternate on the display every 2 seconds (see the example of an alarm below): If the user is authorized (by previous configuration of the dosimeter), they may acknowledge the alarm by pressing the selector button.
  • Page 28 DMC 2000S Dosimeter the following thresholds are then displayed: 6.2.6.1. Dose alarm threshold display This value corresponds to the alarm threshold of the dose equivalent for the main measurement. The display is shown in scientific notation. In the example above, the value of the rate corresponds to 5.92 mRem (5.92 * 10 mRem).

  • Page 29: Switching To Pause Mode

    Switching to the pause mode implies deactivating the DMC 2000S dosimeter. In other words, suppressing the dose equivalent measurement. To switch to the pause mode when using the DMC 2000S in the autonomous mode, press the selector button and follow the procedure listed below: The selector button should be held pressed in for approximately 10 seconds.

  • Page 30: Operation In The Pause Mode

    6.4 Operation in the pause mode 6.4.1. Normal display When the DMC 2000S dosimeter is in the pause mode, it continuously performs the operations described in section 2.2.2, page 10. Switching to this mode requires the use of a centralized dosimetry system.
  • Page 31 When in the autonomous mode, the following operations can be performed by using the selector button: activation and deactivation of the DMC 2000S dosimeter (switch from pause mode to the measurement mode and vice versa) viewing of necessary information on the DMC 2000S dosimeter display modification of the alarm thresholds when necessary This information is described below, and includes the corresponding displays.
  • Page 32 DMC 2000S Dosimeter The different functions of the selector button are listed below: pressing the button: displays the next data pressing and holding: maintains the data on the display after 5 seconds without pressing: normal display in the pause mode The following data is displayed in succession (by pressing the selector button): 6.4.2.1.
  • Page 33 DMC 2000S Dosimeter 6.4.2.4. Dose recording mode display The message “ total ” indicates that the dosimeter accumulates the dose equivalent values at the end of each dosimeter use. The message “ reset ” indicates that the dosimeter resets to zero each time it is switched to the measurement mode.
  • Page 34 DMC 2000S Dosimeter In the example above, the value of the rate corresponds to 208 mRem/h (2.08 * 10 mRem/h) 6.4.2.7. Time display (Watch/Clock) This is configured using DOSIMASS or Access Control software for a live time ‘Watch/Clock’ feature (this feature can be ON or OFF). This feature is only available DMC 2000 dosimeters with firmware version 2.6 or higher.
  • Page 35 The EXT mode is for training mode and will not accumulate dose with ionizing radiation in this mode. This feature is only available in dosimeters with firmware version 2.6 or greater. Contact MGP Instruments concerning the use of this feature. 15-00007...
  • Page 36 DMC 2000S Dosimeter 6.4.2.15. Optional external probe number display This value corresponds to the identification number specific to the optional extremity probe, if the external extremity probe is connected. The message “ FFFFFF ” indicates that the dosimeter does not have an extremity probe connected.

  • Page 37: Alarms

    ! The audible alarms and alarm displays can be disabled when configuring the DMC 2000S; this function can be configured at the factory or modified using the DOSIMASS maintenance software or the DOSIVIEW access control software, in conjunction with the LDM 2000 reader.
  • Page 38 DMC 2000S Dosimeter 7.1.2. Rate pre-alarm cause (only in the measurement mode): pre-alarm threshold for the dose rate exceeded audible alarm (see below): On : 150 ms Off : 50 ms display: the message “ Rate ” and the “warning” symbol flash. The dose is still displayed (see...

  • Page 39: Dose Alarm

    DMC 2000S Dosimeter 7.1.3. Dose alarm cause (only in the measurement mode): dose equivalent alarm threshold exceeded audible alarm (see below): On : 50 ms Off : 150 ms display: the message “ Dose Alarm ” flashes. The dose is still displayed (see below): Note: the dose alarm cannot be silenced via acknowledgement.

  • Page 40: Time Alarm

    DMC 2000S Dosimeter In the event that a rate alarm occurs at the same time as a pre-alarm or a dose alarm, the audible alarm indication is as follows: On : 150 ms On : 50 ms Off : 50 ms...

  • Page 41: Setting Operating Parameters

    8.2 In the autonomous mode When the DMC 2000S is in the Autonomous mode, the user can directly modify the main operating parameters by simply using the selector button. No other equipment is required. This can only be accomplished while the dosimeter is in the pause mode.
  • Page 42 DMC 2000S Dosimeter 8.3.1.2. Dose alarm threshold modifiable in both the satellite (with an LDM-101 or LDM 2000 and the appropriate software) and autonomous modes This parameter corresponds to the dose equivalent value above which an alarm will be triggered.
  • Page 43 DMC 2000S Dosimeter 8.3.1.5. Dose pre-alarm warning threshold modifiable in both the satellite (with an LDM-101 or LDM 2000 and the appropriate software) and autonomous modes This parameter corresponds to the dose equivalent value above which a pre-alarm will be triggered.
  • Page 44 DMC 2000S Dosimeter 8.3.1.7. Audible alarm indications modifiable only in the satellite mode, with an LDM-101 or LDM 2000 and the appropriate software This parameter provides an indication of the ambient rate to the User by an audible signal, which is independent of the display.

  • Page 45: Modifying Parameters

    Press and release the selector button once and the display changes to: Press and release the selector button a second time and the DMC 2000S dosimeter is now in the parameter modification mode. First, the message below will be displayed for a few seconds.
  • Page 46 DMC 2000S Dosimeter The following message is displayed: The modifiable parameters can now be accessed by simply pressing and releasing the selector button. The parameters are then displayed in the order as outlined in the section Modifiable parameters, page 40.
  • Page 47 (for example: “RESET “ or “TOTAL”) Steps “ I ” and “d” are displayed after step “ P ”, but not in any particular order. The DMC 2000S dosimeter automatically switches back to the pause mode after 10 seconds of inactivity on the selector button.
  • Page 48 DMC 2000S Dosimeter press and hold the selector button until the flashing “ I ” is displayed increment the digit to the desired value by pressing and releasing the selector button until this value is reached in the example shown, the selector button must be pressed 4 times in order to obtain the value “9”...
  • Page 49 DMC 2000S Dosimeter validating the new values: press and hold the selector button until the flashing “ P ” is displayed modifying other parameters: press and release the selector button to access the next parameter to be modified repeat the steps as described above for the “dose alarm” parameter return to the pause mode: wait approximately 10 seconds before using the selector button.

  • Page 50: Other Functions

    Setting operating parameters , section “Emergency start-up”, page 43). When the “emergency start-up” operating mode is enabled, the following message is continuously displayed: Simply pressing once on the selector button immediately switches the DMC 2000S dosimeter to the measurement mode: The following message is displayed briefly: then the dosimeter switches to the measurement mode: the “functional indicator”...

  • Page 51: Historical

    (pause and measurement) dosimeter fault saturation dating of the last assignment change In order to provide this function, the DMC 2000S dosimeter is equipped with internal clock functionality, which is set during configuration (refer to the centralized dosimetry system User’s manual). 15-00007...

  • Page 52: Faults

    DMC 2000S Dosimeter 10. Faults This section includes a troubleshooting guide, which describes the dosimeter fault messages. Dosimeter faults are indicated by: an audible signal emitted by the dosimeter buzzer display of the current message, alternating with a fault message every 2 seconds, and lasting 2 seconds 10.1.1.
  • Page 53 DMC 2000S Dosimeter 10.1.2. “Defective” battery most likely cause: battery totally discharged or battery removed 3 audible pulses every 10 seconds: 10 s 10 s display: the display reads “DF BAT ” and the “functional indicators” are no longer present the dosimeter completely stops after 3 minutes.
  • Page 54 The Calibration mode is for factory calibration and will not accumulate dose with ionizing radiation in this mode. This feature is only available in dosimeters with firmware version 2.6 or greater. Contact MGP Instruments concerning the use of this feature.
  • Page 55 2 audible pulses every second (only if the dosimeter is in the measurement mode): display: the display reads “ DF DET ” corrective action: return dosimeter to MGP Instruments 15-00007 Page 55 of 65...
  • Page 56 E2PROM memory display: the display reads “ DF E2P ”. corrective action: remove the battery and then reinstall the battery if the fault persists, return the dosimeter to MGP Instruments. 10.1.7. Initialization fault most likely cause: dosimeter data integrity problem display: the display reads “...

  • Page 57: Maintenance

    DMC 2000S Dosimeter 11. Maintenance 11.1 Changing the battery To change the dosimeter Renata battery, follow the steps below. Using the tool provided (or if unavailable, using a screwdriver), unscrew (counterclockwise) the battery cover shown below: battery cover • Remove the battery cover and remove the battery...
  • Page 58 DMC 2000S Dosimeter insert a new Renata battery in the housing (with the “ + ” side of the battery placed towards the back of the dosimeter) replace (clockwise) the battery cover back on using the key. When the battery is removed, the “defective” battery alarm (i.e. DF BAT) is triggered.

  • Page 59: Technical Characteristics

    DMC 2000S Dosimeter 12. Technical characteristics 12.1 Physical characteristics radiation detected: X-rays and gamma fields with energies from 60 keV to 6 MeV quantity measured: individual dose equivalent Hp (10) the corresponding dose rate measurement range: dose equivalent: from background to 1000 Rem (10 Sv)
  • Page 60 DMC 2000S Dosimeter 12.1.1. Isotropic graph curve at a dose rate of 1 rem/h with Cs 137 1,20 antenna side battery side 1,00 0,80 selector button side 0,60 0,40 0,20 vertical 0,00 horizontal 12.1.2. Linearity graph response as a function of exposure rate, of two dosimeters to cesium...

  • Page 61: Functional Characteristics

    DMC 2000S Dosimeter 12.2 Functional characteristics indicators: LCD display (6 alphanumeric characters + symbols) indicator lights (red light-emitting diode) selector button for acknowledging pre-alarms and viewing the rate buzzer: sound level ≥ 85 dBA at 30 cm (12”) alarms: precision: the alarm is triggered when the measured value reaches the corresponding alarm threshold value dose alarm: 2 thresholds (alarm and pre-alarm);...

  • Page 62: Mechanical Characteristics

    DMC 2000S Dosimeter 12.4 Mechanical characteristics dimensions: Width: 44 mm; 1.76 in. Height: 83 mm; 3.26 in. depth: 9 mm .35 in. (18 mm; .70 in. at the display) Weight: approximately 50 g; 1.76 oz. drop resistant (up to 25 drops) from a height of 1.5 m (4’9”) onto a hard surface 12.5 Environmental characteristics...
  • Page 63 DMC 2000S Dosimeter 13. Replacement parts The spare parts listed below can be ordered from MGP Instruments. For special orders or for parts not listed below, contact MGP Instruments’ Customer service department. Name MGP Instruments’ Reference number battery D20-2000 battery cover (with seal)
  • Page 64 DMC 2000S Dosimeter 14. Appendix 1: connector for teledosimetry, alarm transmission or external probe The DMC 2000S connector allows connection to: a teledosimetry transmitter an external alarm indicator an external probe a wired area monitor hub This appendix describes the various functions of the connector’s inputs/outputs.
  • Page 65 “autonomous” mode: this operating mode allows the DMC 2000S to be configured and operated independently, without using any other equipment, such as readers or configuration software. “satellite” mode: this mode is the most typical operating mode of the DMC 2000S. It allows a dosimeter to be used in a centralized dosimetry system.

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