ludlum model 26-1 frisker user`s manual
Contents
1. Hundreds Place 1 9 Dead Time Correction Default 75 microseconds Use ON ACK to select the value to adjust and MODE to adjust the value Value is in microseconds Available values are Ones Place 0 9 Tens Place 0 9 Hundreds Place 0 9 Ludlum Measurements Inc Page 5 4 December 2014 Model 26 1 Frisker Users Manual Section 5 Efficiency Default 15 0 Use ON ACK to select the value to adjust and MODE to adjust the value Available values are Ones Place 0 9 Tens Place 0 9 Hundreds Place 0 9 Number of Decimal Places 0 or 1 Normally the efficiency is used on a per detector basis i e the efficiency of the detector is calculated by dividing the count rate recetved from a source by the total disintegration rate of the source But if the user desires to have the Model 26 1 show results in terms of dpm 100 cm the user could manipulate the efficiency to produce this result efficiency count rate disintegration tate 6 7 The factor of 6 7 is the ratio of 100 cm to 15 cm which is the size of the pancake detector If we start with the default value of 15 to measure in dpm then the parameter could be changed to 2 2 to measure in dpm 100 cm Or likewise for Bq en efficiency could be calculated as efficiency countrate disintegration rate 15 Again the factor of 15 is because the area of the pancake detector is 15 cm If we start with the default value of 15 to measure in Bq then the param2. Should the Alarm LED fail to turn on the device is in need of repair Please refer to Figure 2 below Figure 2 Firmware version display and Alarm LED check shown The instrument will then move to normal operation displaying the current rate for the Primary units default cpm The user may select the Secondary units default mR hr by pressing the Units button Page 2 3 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 Ensure that the low battery indicator is not present If the low battery indicator is present replace the batteries as soon as possible Should the instrument detect a battery voltage that is high enough to power on but too low to safely operate the display will blank and the low battery icon will flash Normal operation will not be available until the batteries have been replaced Under extreme low battery conditions be aware that the unit may not even turn on or may turn itself off abruptly A reference reading with a check source 1 Ci 37 kBq of Cs for example should be obtained at the time the instrument is recetved in the field Small check sources of radiation are available from Ludlum Measurements While exempt from many regulations because of their small size these sources are large enough to produce a response on this instrument The detector s position is indicated by the circular screen on the back of the Model 26 1 the seam between the enclosure halves indic
3. or d will not be displayed but mR or uSv will The ALARM LCD Segment will be on to indicate an Alarm parameter Set this Alarm Point to 000 to disable Available values ate Ones Place 0 9 Tens Place 0 9 Hundreds Place 0 9 Thousands Place 1 on or off Number of Decimal Places 0 1 or 2 only available if k selected Range k on or off not available for mR or uSv Note If the Primary Count Units has changed to a value other than that used to previously set this Alarm Point the Alarm Point will be reset to 000 Secondary Units Default mR h Use MODE to select Available values ate cps cpm Bq dpm mR h uSv h and off no units displayed excluding the units selected as Primary Units Ludlum Measurements Inc Page 5 6 December 2014 Model 26 1 Frisker Users Manual Section 5 Secondary Units RATE MAX Mode Alarm Point Default 000 Use ON ACK to select the value to adjust and MODE to adjust the value If the Secondary Units is off this parameter will be skipped Otherwise units will be the same as selected earlier with Secondary Units The ALARM LCD Segment will be on to indicate an Alarm parameter Set this Alarm Point to 000 to disable Available values are Ones Place 0 9 Tens Place 0 9 Hundreds Place 0 9 Thousands Place 1 on or off Number of Decimal Places 0 1 or 2 only available if k selected Range k on or off not available for mR h ot uSv h Note If the Secondary Units
4. LUDLUM MODEL 26 1 FRISKER USER S MANUAL December 2014 Serial Number PF002366 and Succeeding Serial Numbers LUDLUM MODEL 26 1 FRISKER USER S MANUAL December 2014 Serial Number PF002366 and Succeeding Serial Numbers LUDLUM MEASUREMENTS INC M 501 OAK STREET PO BOX 810 SWEETWATER TEXAS 79556 325 235 5494 FAX 325 235 4672 REVISION HISTORV DATE REMOVE STUB DO NOT SCRATCH PLASTIC FOLD RIBBON CABLE IN HALF AND INSERT THRU SLOT INSTALL FIVE PIN HOUSING 13 9264 ONTO RIBBON CABLE 7498 398 M 26 1 FRONT MEMBRANE SWITCH Model 26 1 Frisker Introduction Getting Started Unpacking and Repacking Battery Installation Instrument Operational Test Detector Failure Diagnostic Detector Over Range Instrument Use and Controls RATE Mode Operation MAX Mode Operation COUNT Mode Operation Specifications Gamma Energy Compensation Setup mode Setup Overview Default Setup Values Entering Setup Mode Setup Mode Operation Safety Considerations Environmental Conditions for Normal Use Warning Markings and Symbols Cleaning and Maintenance Precautions Revision History Recycling Maintenance and Spare Parts Users Manual Table of Contents 2 1 2 2 2 3 2 5 2 5 2 6 2 7 2 8 2 9 5 1 5 2 5 3 5 4 6 1 6 1 6 2 Model 26 1 Frisker Users Manual Maintenance 9 1 Spare Parts 9 1 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 1 Introduction The Model 26 1 is an er
5. T mode If other operational modes are available pressing the MODE button will cancel the current Count Timer and move to the next available operational mode Page 2 10 December 2014 Ludlum Measurements Inc Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 When the Count Timer has finished The display will show either the accumulated total for c d mR and uSv or the timed ratemeter average for cps cpm Bq dpm or the average exposure ot average dose in mR h and uSv h Pressing the UNITS button will switch between the Primary and Secondary Count Units The newly selected Count Units will be displayed for approximately one second and the display will then return to the accumulated total or timed ratemeter average depending on the newly selected Count Units Under a non alatm condition the Alarm Status LED will be off pressing the ON ACK button will reset the Count Timer If an alarm condition occurred during the Timed Count a continuous audio tone will sound and the ALARM display indicator and the Alarm Status LED will turn on Pressing the ON ACK button once will acknowledge and turn off the continuous tone alarm audio Pressing the ON ACK button a second time will clear the alarm condition and reset the Count Timer Alarms are latching in COUNT mode If other operational modes are available pressing the MODE button will move to the next available operational mode Figure 7 COUNT mode ope
6. arameter for use with dpm 100 cm or Bq cm Added note to each Alarm Point Parameter to explain that an Alarm Point will be reset to 000 if the units are changed March 2013 Replaced NORMAL Mode with RATE Mode Updated maximum displayable value for mR h Updated order of Setup Parameters Changed default Dead Time Correction setting Updated Battery Life expectations Added Primary and Secondary Count Units Available tables Added details of low battery warning mode Added more detailed descriptions of operation for RATE MAX and COUNT Modes January 2013 New manual Page 7 1 December 2014 Ludlum Measurements Inc Model 26 1 Frisker Users Manual Section 8 Recycling Ludlum Measurements Inc supports the recycling of the electronics products it produces for the purpose of protecting the environment and to comply with all regional national and international agencies that promote economically and environmentally sustainable recycling systems To this end Ludlum Measurements Inc strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products With many different agencies public and private involved in this pursuit it becomes evident that a myriad of methods can be used in the process of recycling Therefore Ludlum Measurements Inc does not suggest one particular method over another but simply desires to inform its consumers of t
7. ates the approximate center of the detector If this procedure is done routinely with the same radiation source instrument malfunction may be detected when anomalous readings are observed If at any time the instrument fails to read within 20 of the reference reading when using the same check source it should be sent to a calibration facility for recalibration and or repair Example log reading Check Source Rate Units Once this procedure has been completed the instrument is ready for use Page 2 4 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 Detector Failure Diagnostic Note that the Model 26 1 has its own diagnostic tests to ensure that the detector is functioning correctly The Model 26 1 can detect when the radiation detector is malfunctioning and will flash the display to indicate a fault If the detector stops detecting radiation for 60 seconds normally through a puncture of the thin mica window the Model 26 1 will flash a zeto reading for the currently selected units If this indication is observed remove the unit from service and have it evaluated by a qualified repair and calibration technician Figure 3 Detector Failure display shown for cpm will also flash Detector Over Range If the unit has an internal malfunction that causes it to count high or excessively the unit flashes the maximum rate for the currently selected units as a warning The user should ensure whet
8. cated on the side panel See section 7 Recycling for further information The CE mark is used to identify this instrument as being acceptable for use within the European Union Cleaning and Maintenance Precautions The Model 26 1 may be cleaned externally with a damp cloth using only water as the wetting agent Observe the following precautions when cleaning or performing maintenance on the instrument 1 Turn the instrument OFF and remove the batteries 2 Allow the instrument to sit for one minute before cleaning the exterior or accessing any internal components for maintenance Page 6 2 December 2014 Model 26 1 Frisker Users Manual Section 7 Revision Historv NOTE This section of the manual will be updated with each revision of the Model 26 1 in order to document changes over time Ludlum Measurements policy is to provide free software upgrades to instruments for the life of the instrument December 2014 Added Section 4 Gamma Energy Compensation Added Section 9 Maintenance and Spare Parts added Instrument Return Form information on page 2 1 March 2014 Added window protective screen to Specs updated window area numbers December 2013 Deleted surface emission rate in Specs Corrected battery reference to AA November 2013 Added Battery Installation procedure and photos on page 2 2 June 2013 Updated Efficiency Setup Parameter to reflect greater value range Added details to Efficiency P
9. cumulated dose over the chosen count time The following tables lists the possibilities UNITS RESULT c counts per count time d disintegrations per count time cpm cps count rate averaged over the count time dpm Bq disintegration rate averaged over the count time mR h uSv h exposute ot dose rate averaged over the count time mR uSv integrated exposure or dose over the count time Audio clicks are disabled in COUNT mode Page 2 9 December 2014 Model 26 1 Frisker Users Manual Section 2 In COUNT mode opetation depends on the current state of the Count Timer When the Count Timer is Ready The display will show the Count Time and the Alarm Status LED will be off Pressing the UNITS button will switch between the Primary and Secondary Count Units The newly selected Count Units will be displayed for approximately one second and the display will then return to the Count Timer Pressing the ON ACK button starts the Count Timer If other operational modes are available pressing the MODE button will move to the next available operational mode When the Count Timer is active The display will show the Count Time remaining Pressing the ON ACK button will reset the Count Timer The UNITS button is disabled If an alarm condition occurs the display will alternate between the Count Time remaining and the Count Rate The ALARM display indicator and the Alarm Status LEDs will turn on Alarms are latching in COUN
10. ector the response time is reduced to 1 second to quickly show the new value Operational Modes Default 0 all modes available Use MODE to adjust the value Available values are 0 RATE MAX and COUNT Modes 1 RATE and MAX Modes only 2 RATE and COUNT Modes only 3 RATE Mode only Count Time Default 1 minute Use ON ACK to select the value to adjust and MODE to adjust the value Setting Count Time to 0 enables continuous count until reset If 19 minutes are selected then the maximum seconds value is 60 otherwise the maximum seconds value is 59 Available values are Ones Place 0 9 Tens Place 0 6 6 only available if minutes value is 19 Hundreds Place 0 9 Thousands Place 1 on or off NOTE If no buttons are pressed for four seconds the Model 26 1 will switch to the next parameter and if on the last parameter will save the parameters and exit Setup mode returning to RATE mode operation The UNITS button can Ludlum Measurements Inc Page 5 9 December 2014 Model 26 1 Frisker Users Manual Section 5 be used to advance to the next patameter To end Setup mode and save the current setting press and hold the UNITS button for approximately 5 seconds Ludlum Measurements Inc Page 5 10 December 2014 Model 26 1 Frisker N Ludlum Measurements Inc Users Manual Section 6 Safetv Considerations Environmental Conditions for Normal Use Indoor or outdoor use While rain resistant user is ca
11. ergies Ludlum Measurements offers two energy compensation filters that flatten the energy response of the Model 26 1 to facilitate measuring either the exposure rate ot ambient dose equivalent rate The filters developed by Ludlum Measurements flatten the response to within 20 referenced to Cs 662 keV over an energy range of 33 keV to 1 2 MeV for exposure and down to 20 keV for ambient dose equivalent Probe Energy Response mir Standard Response Exposure Filter Response Dose Equivalent Filter Response CPP PHI EC PISIS PLP PSP IPP PSS Gamma Energy keV Ludlum Measurements Inc Page 4 1 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 4 Both filters snap on across the face of any Model 26 1 frisker whenever these type of measurements are desired The filters are then again easily removed to continue on with measuring contamination cpm or Bq Filters can be purchased separately from the instrument or together with a new Model 26 1 Exposure Filter is part LMI 4498 334 Ambient Dose Equivalent Filter is LMI part 2002 1050 The dose filter supplies a filter while the exposure filter comes in a kit that provides the filter plus a replacement detector protective screen that can easily be changed out Page 4 2 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 5 Setup Mode Warning Only advanced users or administrator
12. eter could be changed to 225 to measute in Bq cm Primary Units Default cpm Use MODE to select Available values are cps cpm Bq dpm mR h and uSv h Primary Units RATE MAX Mode Alarm Point Default 000 Use ON ACK to select the value to adjust and MODE to adjust the value Units will be the same as selected earlier with Primary Units The ALARM LCD Segment will be on to indicate an Alarm parameter Set this Alarm Point to 000 to disable Available values are Ones Place 0 9 Tens Place 0 9 Hundreds Place 0 9 Thousands Place 1 on or off Number of Decimal Places 0 1 or 2 only available if k selected Range k on or off not available for mR h ot uSv h Note If the Primary Units has changed to a value other than that used to previously set this Alarm Point the Alarm Point will be reset to 000 Ludlum Measurements Inc Page 5 5 December 2014 Model 26 1 Frisker Users Manual Section 5 Primary Count Units Default c Use MODE to select Available values are dependent on the selected Primary Units Primary Primary Primary Count Primary Count Units Units Units Units Available Available cps dpm cps dpm c d cpm mR h cpm p mR h c mR B Sv h Bq a uSv h d uSv Primary Count Alarm Point Default 000 Use ON ACK to select the value to adjust and MODE to adjust the value Units will be the same as selected earlier with Primary Count Units Primary Count Units of c
13. evious state of operation At completion of the shutdown count the LCD will go blank e Normal Operation Will silence click audio in RATE and MAX modes reset MAX mode display start reset COUNT Timer in COUNT mode and acknowledge silence audio in all modes of operation MODE button Used to advance between the three operating modes RATE MAX and COUNT Note that MAX and or COUNT mode may be disabled from use by the administrator or calibrator UNITS button Used to switch between Primary and Secondary units in RATE and MAX modes In COUNT mode the UNITS button will switch between Primary and Secondary units unless a countdown is active The UNITS button is disabled during an active countdown Page 2 6 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 RATE Mode Operation In RATE mode the current count rate will be displayed Pressing the UNITS button will switch the displayed value between the Primary and Secondary Units Under a non alarm condition the Alarm Status LED will be off pressing the ON ACK button will turn the click audio on off If an alarm condition is present pressing the ON ACK button will acknowledge and turn off the continuous tone alarm audio Under an alarm condition the ALARM display indicator will remain on and the Alarm Status LED will be flashing Alarms are non latching in RATE mode If other operational modes are available pressing the MODE but
14. gonomic lightweight instrument which can be used for alpha beta contamination frisking ot for measuring gamma exposure ot dose It features the ability to measure radiation in count rate exposure rate dose activity rate integrated exposure dose time averaged rates and scaler counts The Model 26 1 utilizes a standard 15 cm 0 9 in Geiger Mueller pancake detector which can detect alpha beta or gamma radiation Caution is needed when handling the instrument because of the thin radiation detector s window Three modes of operation are available for the Model 26 1 RATE MAX and COUNT RATE mode operation will display the current count exposure or activity rate MAX mode is used to capture the highest count activity or exposure rate detected useful for finding a peak rate or frisking when the display is not visible Primary and Secondary Units for RATE and MAX modes can be chosen from cps cpm Bg dpm mR h or uSv h COUNT mode allows the user to perform a count for a predetermined time Depending on the Count Units chosen the result can be a scaler count in counts or disintegrations a time averaged rate cpm dpm Bq cps a time averaged exposure or dose mR h uSv h or an integrated exposure or dose mR or pSv Note The use of the unit to measure gamma dose or exposure correctly can be enhanced by using an optional snap on energy filter Without this filter the energy response of the pancake detector will o
15. has changed to a value other than that used to previously set this Alarm Point the Alarm Point will be reset to 000 Secondary Count Units Default mR Use MODE to select If the Secondary Units is off this parameter will be skipped Otherwise the available values are dependent on the selected Secondary Units Ludlum Measurements Inc Secondary Secondary Secondary Count Secondary Count Units Units Units Units Available Available cps dpm cps c dpm d off off cpm mR h cpm c mR h mR off off Bq uSv h Bq d uSv h uSv off off Page 5 7 December 2014 Model 26 1 Frisker Users Manual Section 5 Secondary Count Alarm Point Default 000 Use ON ACK to select the value to adjust and MODE to adjust the value If the Secondary Units is off this parameter will be skipped Otherwise units will be the same as selected earlier with Secondary Count Units Secondary Count Units of c or d will not be displayed but mR ot uSv will The ALARM LCD Segment will be on to indicate an Alarm parameter Set this Alarm Point to 000 to disable Available values are Ones Place 0 9 Tens Place 0 9 Hundreds Place 0 9 Thousands Place 1 on or off Number of Decimal Places 0 1 or 2 only available if k selected Range k on or off not available for mR or uSv Note If the Secondary Count Units has changed to a value other than that used to previously set this Alarm Point the Alarm Point will be rese
16. he range of recyclable materials present in its products so that the user will have flexibility in following all local and federal laws The following types of recyclable materials are present in Ludlum Measurements Inc electronics products and should be recycled separately The list is not all inclusive nor does it suggest that all materials are present in each piece of equipment Batteries Glass Aluminum and Stainless Steel Circuit Boards Plastics Liquid Crystal Display LCD Ludlum Measurements Inc products that have been placed on the market after August 13 2005 have been labeled with a symbol recognized internationally as the crossed out wheelie bin which notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding Each material must be separated On the Model 26 1 the symbol will be placed on the serial number label located on the side of the instrument The symbol appears as such Ludlum Measurements Inc Page 8 1 December 2014 Model 26 1 Frisker Maintenance Users Manual Section 9 Maintenance and Spare Parts For external cleaning of the instrument scrub with a dampened soapy cloth This is the only regular maintenance required Spare Parts Following is a list of spare parts for a Model 26 1 Description AA Batteries GM Pancake Tube Detector Screen Battery Cover Hook Part 14 5417 01 5008 7241 008 7498 319 Ludlum Measu
17. her this is being caused by a high radiation field or by internal malfunction Figure 4 Detector Over Range shown for uSv h will also flash Page 2 5 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 Instrument Use and Controls With three front panel buttons the Ludlum Model 26 1 is simple and easy to use with minimal training required Default operation is RATE mode and the display shows the current count rate using the Primary units Pressing the UNITS button will switch between Primary and Secondary units Pressing the MODE button will switch the instrument to MAX mode which will display the highest count rate detected Pressing the MODE button again will switch it to COUNT mode which will display the COUNT timer Note that either or both of the MAX and COUNT modes can be locked out in the setup process See the Model 26 1 drawing at the beginning of this manual to reference the following controls ON ACK button Used to power the Model 26 1 ON and OFF silence click audio reset MAX mode start reset the COUNT Timer and acknowledge audio alarms e Power On Press for approximately one second and release all LCD segments will activate and firmware version will be shown e Power Off Press for approximately five seconds The display will show a 3 2 1 countdown for the final three seconds of shutdown Releasing the ON ACK button during shutdown will return the device to the pr
18. ill find a link to the form Page 2 1 December 2014 Model 26 1 Frisker Users Manual Section 2 Battery Installation A low battery indicator appears at the bottom of the LCD when less than 16 hours of battery life remain When this indicator is present follow these steps to replace the two standard AA batteries 1 Grab the ring on the screw 2 Turn the ring one quarter turn countet clockwise 3 Release and remove the battery cover 4 Replace two each AA batteries 5 Firmly insert the barb of the battery cover completely into the body of the Model 26 1 6 Replace the cover and turn ring one quarter of a turn clockwise to secure Warning If this procedure is not followed correctly and the barb is not inserted into the body of the instrument correctly the barb may break off Ludlum Measurements Inc Page 2 2 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 Instrument Operational Test Turn the instrument ON by pressing the ON ACK button for about a second and then releasing The instrument should activate all the LCD segments and the audio Observe the device during this time If any LCD segments are missing or audio fails to work the device is in need of repair Please refer to Figure 1 below Figure 1 Startup display for Model 26 1 with all LCD segments shown The instrument then displays the firmware version number and activates the Alarm LED briefly
19. internal switch on the Model 26 1 in order to protect settings The unit is operated with two alkaline AA batteries for operation from 40 to 65 C 40 to 150 F Battery life is approximately 500 hours under normal usage A low battery indicator on the LCD warns when less than 16 hours of battery life remain Page 1 2 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 Getting Started Unpacking and Repacking Remove the calibration certificate and place it in a secure location Remove the instrument and ensure that all of the items listed on the packing list are in the carton Check individual item serial numbers and ensure calibration certificates match The Model 26 1 serial number is located on a label on the front of the unit To return an instrument for repair or calibration provide sufficient packing material to prevent damage during shipment Be aware that the thin mica window of the detector may be damaged imploded because of pressure differentials if the unit is shipped by air Protect the unit by putting it inside a sealed can or other protective enclosute Every returned instrument must be accompanied by an Instrument Return Form which can be downloaded from the Ludlum website at www ludlums com Find the form by clicking the Support tab and selecting Repair and Calibration from the drop down menu Then choose the appropriate Repair and Calibration division where you w
20. nc Users Manual Section 2 COUNT Mode Operation When entering COUNT Mode from another operational mode the currently selected COUNT Units will be displayed for approximately one second The purpose of COUNT mode is to count for a predetermined amount of time and to display the results on the display Note that the predetermined count time can be from 1 second to 20 minutes or can be set to zero to enable continuous counting until stopped by the user Count mode operation is very flexible depending on the units chosen A common choice is for the count mode to just perform a scaler count for a specified time with a resulting answer in counts equaling detected radiation events Ifa result in terms of activity is desired the scaler count can also be in units of d or disintegrations But if the count units are chosen to be cpm or cps then the resulting answer is an averaged count rate over the time interval Similarly if count units of Bq or dpm are chosen the resulting answet is an averaged disintegration rate V NOTE If the user desires the instrument to show results in terms of disintegrations area eg dpm 100em or Bq cm then the appropriate factor should be placed in the Efficiency parameter Other choices are to have count mode units of mR h or uSv h in which case the COUNT mode result is an averaged exposure or dose rate But if count mode units of mR or uSv are chosen the result is shown in accumulated exposure or ac
21. otes Calibration Constant 3 30 kcpm per mR h Dead Time Correction 75 Microseconds Efficiency 150 Efficiency Primary Units cpm Counts per minute i ane a 000 Disabled Primary Count Units c Counts Primary Count Alarm Point 000 Disabled Secondary Units mR h Non SI exposure rate A ieee 000 Disabled Secondary Count Units mR Non SI exposure Secondary Count Alarm Point 000 Disabled Response Time 0 Enable Auto Response Auto Response Rate F Fast Auto Response Operational Modes 0 All Modes Available Count Time 1 00 One Minute Page 5 2 December 2014 Model 26 1 Frisker Users Manual Section 5 Entering Setup Mode To enter setup mode power down the Model 26 1 then turn the unit back ON Following the display of the Firmware version when the instrument has begun normal operation press the MODE button three times within four seconds to enter Setup mode Entry to Setup mode can be confirmed when the numeric portion of the display shows the Calibration Constant parameter and no units cps cpm Bq dpm mR h or uSv h are displayed If you simply wish to view the parameters you may do so by not pressing any other buttons The parameters will change every four seconds when no buttons are pressed or the UNITS button can be pressed to advance to the next parameter The unit will return automatically to normal operation after the last parameter is presented SETUP PROTECT The Model 26 1 parameters can be protected from unauthori
22. ps above for SETUP PROTECT but use DIP Switch 1 for display backlight selection Setting DIP Switch 1 to the ON right position will configure the display backlight to remain on during operation Set DIP Switch 1 to the OFF left position and the display will be backlit only when light levels ate low NOTE Setting the display backlight for continuous on operation can result in reduced battery life Ludlum Measurements Inc Page 5 3 December 2014 Model 26 1 Frisker Users Manual Section 5 Setup Mode Operation Once the Model 26 1 is in Setup mode the Calibration Constant will be displayed on the LCD and the hundredths digit will be blinking indicating it as the selected item Use the MODE button to adjust the value for the selected item When the appropriate value is selected for that item press the ON ACK button to move to the next item When the desired value is displayed either wait for four seconds for the Model 26 1 to switch to the next parameter or press the UNITS button to advance to the next parameter When the Model 26 1 is in PROTECT mode dipswitch setting the Setup parameters will cycle through to display the set values but changes are not possible The order of Setup parameters for the Model 26 1 is as follows Calibration Constant Default 3 30 kepm per mR h Use ON ACK to select the value to adjust and MODE to adjust the value Value is in kepm per mR Available values are Ones Place 0 9 Tens Place 0 9
23. ration showing COUNT Timer of 10 minutes 30 seconds Page 2 11 December 2014 Model 26 1 Frisker Users Manual Section 3 Specifications Detector pancake GM Geiger Mueller detector stainless steel screen Window Area Active 15 51 cm 2 4 in Open 12 26 cm 1 9 in Window Protective Screen 79 open Efficiency 4pi Surface Plane Alpha 11 for Pu Beta 18 for Tc 32 for P 2 for FC 22 for St X 0 2 for I Gamma 3300 cpm mR h or 5 5 cps pSv h Cs lt 1 for Tc Resolving Time approximately 110 usec as defined by IEC 60325 Alarms rate and count alarm setpoints adjustable over the display range for Primary and Secondary units Overload high rate saturation protection indicated by flashing display and audio alarm prevents false display of lower count rates Zero Protection after 60 seconds of no pulses from detector unit will flash a zero reading and the alarm audio will be triggered LCD Display 3 2 digit LCD with large 12 7 mm 0 5 in digits k cps k epm k Bq k dpm mR h uSv h low battery indicator MAX ALARM Display Range e 0 0 cps to 19 9 keps e 0 00 cpm to 999 kepm e 0 0 Bq to 19 9 kBq e 0 00 dpm to 999 kdpm e 0 0 to 500 mR h e 000 to 1999 uSv h Ludlum Measurements Inc Page 3 1 December 2014 Model 26 1 Frisker Users Manual Section 3 Backlight built in ambient light sensor automatically activates low power LED backlight unless internal dip s
24. rements Inc Page 9 1 December 2014
25. s should consider changing any of the parameters in the following section Incorrect settings could jeopardize the safety of users depending on this instrument Setup Overview Your instrument has been shipped from Ludlum Measurements only after passing electronic checkout a 30 hour burn in process and a careful calibration process Calibration papers are supplied with each instrument shipped from Ludlum Measurements Recalibration should be accomplished after maintenance or adjustments have been performed on the instrument Recalibration is not normally required following instrument cleaning or battery replacement Recalibration does not require any special tools or software to perform Ludlum Measurements offers a full service repair and calibration department Not only do we repair and calibrate our own instruments we also service most other manufacturers instruments Calibration procedures are available upon request for customers who choose to calibrate their own instruments Note Ludlum Measurements Inc recommends recalibration at intervals no greater than one year assuming that regular operational checks are performed Check the appropriate local state and federal regulations to determine required recalibration intervals Page 5 1 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 5 Default Setup Values Setup Parameter Default Value N
26. t to 000 Response Time Default 0 auto Use ON ACK to select the value to be adjusted and MODE to adjust the value Setting the Response Time to a fixed value is useful primarily when performing surveys to a fixed MDA Minimum Detectable Activity level Setting the Response Time to 0 will enable the Auto Response mode for the Model 26 1 see the next parameter Available values for the Response Time in seconds are Ones Place 0 9 Tens Place 0 6 6 forces max Response Time of 60 Ludlum Measurements Inc Page 5 8 December 2014 Model 26 1 Frisker Users Manual Section 5 Auto Response Rate Default F Use MODE to select Fast F ot Slow S When operating in Auto Response mode the Model 26 1 will vary the Response Time based on the Auto Response Rate selected Fast or Slow and the current Count Rate The following table shows the response time for different count rates when these auto response modes are chosen Auto Response Auto Response Count Rate Time Fast Time Slow Seconds Seconds Less than 3 kepm 50 cps 5 10 Between 3 kcpm and 4 kepm 67 cps 4 8 Between 4 kcpm and 6 kepm 100 cps 3 6 Between 6 kcpm and 12 kepm 200 cps 2 4 More than 12 kepm 1 2 The Model 26 1 also utilizes a Step function in Auto Response mode which enables faster response to a significant increase or decrease in Count Rate When the instrument detects a sudden change in count rate from the det
27. ton will move to the next available operational mode Figure 5 RATE mode display showing typical background radiation rate and the low battery icon Page 2 7 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 2 MAX Mode Operation While in MAX mode the highest detected count rate since the last reset is displayed The word MAX will be displayed when in MAX mode Pressing the UNITS button will switch the displayed value between the Primary and Secondary Units Under a non alarm condition the Alarm Status LED will be off pressing the ON ACK button will turn the click audio on off Pressing the ON ACK button a second time will reset the display and enable the click audio If an alarm condition is present pressing the ON ACK button once will acknowledge and turn off the continuous tone alarm audio The click audio will remain as selected under non alarm conditions Pressing the ON ACK button a second time will reset the display and clear the alarm condition Under an alarm condition the ALARM display indicator will remain on and the Alarm Status LED will be flashing Alarms in MAX mode latch with the display If other operational modes ate available pressing the MODE button will move to the next available operational mode Figure 6 MAX mode operation display with ALARM indicator and alarm LED Page 2 8 December 2014 Model 26 1 Frisker Ludlum Measurements I
28. utioned to avoid getting water through detector opening No maximum altitude Temperature range of 40 to 65 C 40 to 150 F Maximum relative humidity of less than 95 non condensing Pollution Degree 3 as defined by IEC 664 Occurs when conductive pollution or dry nonconductive pollution becomes conductive due to condensation This is typical of industrial or construction sites Not certified for use in an explosive atmosphere Warning Markings and Symbols Caution The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements Inc The Model 26 1 Frisker is marked with the following symbols CAUTION per ISO 3864 No B 3 1 designates hazardous live voltage and risk of electric shock During normal use internal components are hazardous live This instrument must be isolated or disconnected from the hazardous live voltage before accessing the internal components This symbol appeats on the side panel Be sure to take the precautions noted in the next section whenever necessary Page 6 1 December 2014 Model 26 1 Frisker al CE Ludlum Measurements Inc Users Manual Section 6 The crossed out wheelie bin symbol notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding Each material must be separated The symbol is placed on the label lo
29. ver respond to gamma energies in the 20 150 keV range See the Gamma Energy Response graph and more detailed information in Section 4 Ludlum Measurements recommends the use of its Exposure Filter 4498 334 or the Ambient Dose Equivalent Filter 2002 1050 Page 1 1 December 2014 Model 26 1 Frisker Ludlum Measurements Inc Users Manual Section 1 The instrument features a large backlit LCD liquid crystal display a piercing audio warning and easy intuitive use in a single handed platform A comfortable wrist strap and lanyard are also included for keeping the instrument close and secure The unit body is made of lightweight but durable plastic It is intended for outdoor use and can resist splashing water The display will be automatically backlit if light levels are low The display backlight can also be configured for Continuous On operation RATE and MAX modes can be silent or utilize a click audio the click audio is always silent during COUNT mode Setup of the instrument is accomplished through the front panel buttons The advanced user or administrator can set e Calibration Constant e Dead Time Correction e Efficiency e Primary and Secondary Units e Primary and Secondary Unit Alarm Levels e Primary and Secondary Count Units e Primary and Secondary Count Alarm Levels e Response Time e Auto Response Rate Fast or Slow e Available Operational Modes e Count Time Setup can be disabled via the
30. witch 1 is set to continuous on User Controls e ON OFF Quiet press to turn ON tap to alternate between click audio and QUIET hold for OFF e MODE alternates between RATE count rate MAX captures peak rate and COUNT preset count time modes e UNITS alternates between Primary and Secondary units Count Time Range 1 second to 20 minutes or 0 enables continuous counting until stopped by user Click Audio greater than 60 dB at 0 6 m 2 ft approximately 4 5 kHz Power two alkaline AA batteries Battery Life approximately 500 hours of operation as low as 250 hours with backlight configured for continuous on 16 hour low battery warning Construction high impact plastic with water resistant rubber seals and separate battery compartment Environmental Rating NEMA National Electrical Manufacturers Association rating of 3 or IP Ingress Protection rating of 53 Distance from Surface Plane to Grill 0 32 cm one eighth inch Size 4 6 x 6 9 x 27 2 cm 1 8 x 2 7 x 10 7 in Hx Wx L Weight 0 45 kg 1 0 Ib Ludlum Measurements Inc Page 3 2 December 2014 Model 26 1 Frisker Users Manual Section 4 Gamma Energy Compensation The GM pancake detector has a significant over response at lower energies between approximately 20 to 160 keV see red line on graph below Any exposute or dose measurements taken with an unfiltered GM pancake detector would have unacceptable errors at these lower en
31. zed changes via the internal switch located on the Model 26 1 circuit board To change the switch open the battery compartment and remove the batteries from the Model 26 1 Next loosen the four captive Phillips head screws that fasten the detector cover Now turn the Model 26 1 over so that the detector is facing up Gently remove the plastic case that covers the back of the instrument paying careful attention not to lose the protective screen that covers the detector itself Remove the protective screen and gently lift the GM pancake detector and set it to the side The DIP ual in line position switch should now be visible below the detector retainer To protect the Model 26 1 from changes in Setup mode slide DIP Switch 2 closest to the battery compartment to the ON right position If DIP Switch 2 is in the OFF left position changes are allowed in Setup mode Once the DIP Switch is set as desired gently replace the detector in the detector retainer Place the detector screen over the detector and fit the plastic case on the back of the instrument Turn the instrument over and tighten the four Phillips head screws Install the batteries and replace the battery cover Note that with the DIP Switch 2 in the ON position Setup mode may be entered and parameters viewed but changes cannot be made DISPLAY BACKLIGHT Continuous On The Model 26 1 display backlight can be set to remain on continuously during operation Follow the ste
Download Pdf Manuals
Related Search