LUDLUM 26-1 User Manual
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LUDLUM 26-1 User Manual

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LUDLUM MODEL 26-1 FRISKER
USER'S MANUAL
April 2017
Serial Number PF002366
and Succeeding Serial Numbers

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Summary of Contents for LUDLUM 26-1

  • Page 1 LUDLUM MODEL 26-1 FRISKER USER’S MANUAL April 2017 Serial Number PF002366 and Succeeding Serial Numbers...
  • Page 2 LUDLUM MODEL 26-1 FRISKER USER’S MANUAL April 2017 Serial Number PF002366 and Succeeding Serial Numbers...

  • Page 4: Statement Of Warranty

    RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
  • Page 7 Model 26-1 Frisker User’s Manual...

  • Page 8: Table Of Contents

    Model 26-1 Frisker User’s Manual Table of Contents 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...
  • Page 9 Model 26-1 Frisker User’s Manual...

  • Page 10: Introduction

    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 (0.9 in ) Geiger-Mueller "pancake" detector, which can detect alpha, beta, or gamma radiation.
  • Page 11  Auto-Response Rate (Fast or Slow)  Available Operational Modes  Count Time Setup can be disabled via the 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).

  • Page 12: Getting Started

    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.

  • Page 13: Battery Installation

    Model 26-1 Frisker User’s 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.

  • Page 14: Instrument Operational Test

    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.
  • Page 15 The detector's position is indicated by the circular screen on the back of the Model 26-1: the seam between the enclosure halves indicates 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.

  • Page 16: Detector Failure Diagnostic

    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.

  • Page 17: Instrument Use And Controls

    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.

  • Page 18: Rate Mode Operation

    Model 26-1 Frisker User’s 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”...

  • Page 19: Max Mode Operation

    Model 26-1 Frisker User’s 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.

  • Page 20: Count Mode Operation

    Model 26-1 Frisker User’s 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.
  • Page 21 Model 26-1 Frisker User’s Manual Section 2 In COUNT mode, operation 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.
  • Page 22 Model 26-1 Frisker User’s Manual Section 2 When the Count Timer has finished:  The display will show either the accumulated total for c, d, mR, and µSv, or the timed ratemeter average for cps, cpm, Bq, dpm, or the average exposure or average dose in mR/h and µSv/h.

  • Page 23: Specifications

    Model 26-1 Frisker User’s Manual Section 3 Section Specifications Detector: pancake GM (Geiger-Mueller) detector, stainless steel screen Linearity: ±10% Window Area: Active: 15.51 cm² ( 2.4 in²); Open: 12.26 cm² (1.9 in²) Window Protective Screen: 79% open Efficiency (4pi) Surface Plane:...
  • Page 24 Model 26-1 Frisker User’s Manual Section 3  .000 to 1999 µSv/h Backlight: built-in ambient light sensor automatically activates low-power LED backlight, unless internal dip switch 1 is set to continuous-on. User Controls:  ON/OFF/Quiet – press to turn ON, tap to alternate between ‘click’...

  • Page 25: Gamma Energy Compensation

    Ludlum Measurements offers two energy compensation filters that flatten the energy response of the Model 26-1 to facilitate measuring either the exposure rate or ambient dose equivalent rate. The filters developed by Ludlum Measurements flatten the response to within ±20% referenced to...
  • Page 26 Model 26-1 Frisker User’s 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).

  • Page 27: Setup Mode

    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.

  • Page 28: Default Setup Values

    Model 26-1 Frisker User’s Manual Section 5 Default Setup Values Setup Parameter Default Value Notes Calibration Constant 3.30 kcpm per mR/h Dead Time Correction Microseconds Efficiency 15.0 Efficiency % Primary Units Counts per minute Primary Units RATE/ MAX Disabled Mode Alarm Point...

  • Page 29: Entering Setup Mode

    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.

  • Page 30: Setup Mode Operation

    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.
  • Page 31 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 rate/6.7.
  • Page 32 Model 26-1 Frisker User’s 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 mR/h mR/h µSv/h...
  • Page 33 Model 26-1 Frisker User’s 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.
  • Page 34 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:...
  • Page 35 Tens Place (0-9) Hundreds Place (0-9) 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 be used to advance to the next parameter.

  • Page 36: Safety Considerations

    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.

  • Page 37: Cleaning And Maintenance Precautions

    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.

  • Page 38: Revision History

    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.
  • Page 39 Model 26-1 Frisker User’s Manual Section 7 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.

  • Page 40: Recycling

    “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.

  • Page 41: Maintenance And Spare Parts

    Maintenance and Spare Parts Maintenance 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 Part # AA Batteries 14-5417...

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