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Ludlum Measurements Frisker 26 User Manual

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Model 26 Frisker User's Manual
Ludlum Measurements
December 2024
Serial Number: PF013016 and Succeeding

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Summary of Contents for Ludlum Measurements Frisker 26

  • Page 1 Model 26 Frisker User’s Manual Ludlum Measurements December 2024 Serial Number: PF013016 and Succeeding...
  • Page 3 Model 26 Frisker User’s Manual Ludlum Measurements December 2024 Serial Number: PF013016 and Succeeding...

  • Page 5: Statement Of Warranty

    STATEMENT OF WARRANTY Ludlum Measurements, Inc. warrants the products covered in this manual to be free of de- fects due to workmanship, material, and design for a period of twelve months from the date of delivery. The calibration of a product is warranted to be within its specified accuracy lim- its at the time of shipment.

  • Page 9: Table Of Contents

    ONTENTS Contents 1 Introduction 2 Getting Started Unpacking and Repacking ....... Battery Installation .

  • Page 11: Introduction

    20-150 keV range. See the Gamma Energy Response graph and more de- tailed information in Chapter 4. Ludlum Measurements recommends the use of its Ambient Dose Equivalent Filter 2002-1050.
  • Page 12 1000 hours under normal usage (as low as 500 hours with backlight configured for continuous-on) with a low-battery indicator on the LCD warning when less than 16 hours of battery life remain. Ludlum Measurements, Inc.

  • Page 13: Getting Started

    ETTING TARTED 2.1 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 between instruments and de- tectors (if applicable).

  • Page 14: Battery Installation

    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.

  • Page 15: Detector Failure Diagnostic

    2.4. DETECTOR FAILURE DIAGNOSTIC 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 of log reading: Check Source # Count Rate Once this procedure has been completed, the instrument is ready for use. 2.4 Detector Failure Diagnostic Note that the Model 26 has its own diagnostic tests to ensure that the detector is functioning correctly.
  • Page 16 Figure 2.1: NORMAL mode display showing typical background radiation rate and the low- battery icon. Figure 2.2: MAX mode operation display with ALARM indicator. Figure 2.3: SCALER mode operation showing SCALER Timer of 10 minutes, 30 seconds. Ludlum Measurements, Inc.

  • Page 17: Specifications

    PECIFICATIONS Detector: pancake GM (Geiger-Mueller) detector, stainless steel screen Linearity: ±10% 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 • Beta: 14% for Tc;...
  • Page 18 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.) (H x W x L) Weight: 0.45 kg (1.0 lb) Ludlum Measurements, Inc.

  • Page 19: Gamma Energy Compensation

    Ludlum Measurements offers an energy compensation filter that flattens the energy response of the Model 26 to facilitate measuring the ambient dose equivalent rate. The filter developed by Ludlum Measurements flattens the response to within ±20% refer- enced to Cs (662 keV) over an energy range of 20 keV to 1.2 MeV.
  • Page 20 CHAPTER 4. GAMMA ENERGY COMPENSATION Since the Model 26 only measures in count rate units, it is not usually used to measure gamma radiation (the Ludlum Model 26-1 may be more appropriate). Ludlum Measurements, Inc.

  • Page 21: Setup Mode

    5.1 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 22: Default Setup Values

    DISPLAY BACKLIGHT ‘Continuous On’: The Model 26 display backlight can be set to re- main on continuously during operation. Follow the steps above for SETUP PROTECT, but use DIP Switch 1 for display backlight selection. Setting DIP Switch 1 to the ON (right) posi- Ludlum Measurements, Inc.

  • Page 23: Setup Mode Operation

    5.4. SETUP MODE OPERATION tion 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 are low. Setting the display backlight for continuous-on operation can result in reduced battery life.
  • Page 24 59. Available values are: • Ones Place (0-9) • Tens Place (0-9) • Hundreds Place (0-9) • Thousands Place (1 on or off) Operational Modes (Default 0) - Use MODE to adjust the value. Available values are: Ludlum Measurements, Inc.
  • Page 25 5.4. SETUP MODE OPERATION 0 - NORMAL, MAX, and SCALER Modes 1 - NORMAL and MAX Modes 2 - NORMAL and SCALER Modes 3 - NORMAL Mode Only If no buttons are pressed for four seconds, the Model 26 will switch to the next parameter, and if on the last parameter, will save the parameters and exit Setup mode, returning to NORMAL mode operation.

  • Page 27: Safety Considerations

    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 spec- ified by Ludlum Measurements, Inc. The GM tube face can rupture above 8000 feet in altitude. When transporting this detector by air, use an airtight container in order to avoid sudden atmo- spheric changes resulting in tube failure.

  • Page 28: Cleaning And Maintenance Precautions

    Observe the following precautions when cleaning or performing maintenance on the instrument: • Turn the instrument OFF and remove the batteries. • Allow the instrument to sit for one minute before cleaning the exterior or accessing any internal components for maintenance. Ludlum Measurements, Inc.

  • Page 29: Revision History

    This section of the manual will be updated with each revision of the Model 26 in order to document changes over time. Ludlum Measurements’ policy is to provide for free, the latest firmware release for an instrument for the life of that instrument.
  • Page 30 May 2024: In Chapter 3 Specifications for Efficiency, changed the Tc efficiency to 14%. September 2024: In Chapter 1, corrected the size of the detector to 15.5 cm (2.4 in December 2024: Added Section 5.2 Default Setup Values. Ludlum Measurements, Inc.

  • Page 31: Recycling

    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.

  • Page 33: Maintenance And Spare Parts

    AINTENANCE AND PARE ARTS 9.1 Maintenance For external cleaning of the instrument, scrub with a dampened, soapy clot. This is the only regular maintenance required. 9.2 Spare Parts Following is a list of spare parts for the Model 26 : Description Part Number AA Batteries...