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Ludlum Measurements 26S User Manual
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Ludlum Measurements 26S User Manual

Integrated scintillator
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Model 26S Integrated Scintillator User's
Manual
Ludlum Measurements
November 2024
Serial Number: PF013016 and Succeeding

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Summary of Contents for Ludlum Measurements 26S

  • Page 1 Model 26S Integrated Scintillator User’s Manual Ludlum Measurements November 2024 Serial Number: PF013016 and Succeeding...
  • Page 3 Model 26S Integrated Scintillator User’s Manual Ludlum Measurements November 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

    The scintillator is energy-dependent, and will over-respond to energies in the 100 keV region. Three modes of operation are available for the Model 26S – 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 –...
  • Page 12 Setup of the instrument is accomplished through the front-panel buttons. (Setup can be disabled via the internal switch on the Model 26S in order to protect settings.) The advanced user or administrator can set calibration constant, dead time correction, efficiency, primary...

  • Page 13: Getting Started

    Check individual item serial numbers and ensure calibration certificates match between instruments and de- tectors (if applicable). The Model 26S serial number is located on a label on the front side of the unit.

  • Page 14: Battery Installation

    The instrument should display "888" and activate 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 the figure below. Ludlum Measurements, Inc.
  • Page 15 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 16: Detector Failure Diagnostic

    CHAPTER 2. GETTING STARTED The detector’s position is indicated by the circular screen on the back of the Model 26S: 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 17: Instrument Use And Controls

    Figure 2.4: Detector Over Range (shown for Sv/h); will also flash. 2.6 Instrument Use And Controls With three front-panel buttons, the Ludlum Model 26S is simple and easy to use with min- imal training required. Default operation is RATE mode, and the display shows the cur- rent rate using the Primary units.

  • Page 18: Rate Mode Operation

    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. Ludlum Measurements, Inc.

  • Page 19: Count Mode Operation

    2.9. COUNT MODE OPERATION If other operational modes are available, pressing the MODE button will move to the next available operational mode. Figure 2.6: MAX Mode operation display with ALARM indicator and alarm LED. 2.9 COUNT Mode Operation When entering COUNT Mode from another operational mode, the currently selected COUNT Units will be displayed for approximately one second.
  • Page 20 • The display will show either the accumulated total for c, d, R, and Sv, or the timed ratemeter average for c/s, c/m, d/s, d/m, or the average exposure or average dose rate in R/h and Sv/h. Ludlum Measurements, Inc.
  • Page 21 2.9. COUNT MODE OPERATION • 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.

  • Page 23: Specifications

    PECIFICATIONS Detector: 2.5 x 1.9 cm (1 x 0.75 in.) (diameter x length) CsI(Tl) scintillator (energy dependent) Exposure Linearity: ±10% from background to 200 Sv/h (20 mR/hr) Count Rate Linearity ±10% from 8 c/s to 8 kc/s (200 c/m to 999 kc/m) Energy Range: from 40 keV to 3 MeV Operating Exposure Rate Range: from .05 to 200 Sv/h (5 R to 20 mR/hr) Energy Response: energy-dependent, will over-respond to energies in the 100 keV region...
  • Page 24 Environmental Rating: NEMA (National Electrical Manufacturers Association) rating of 3 or IP (Ingress Protection) rating of 53 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: 0.35 kg (0.75 lb) Ludlum Measurements, Inc.

  • Page 25: Setup Mode

    4.1 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 26: Default Setup Values

    Sigma Audio Enabled 4.3 Entering Setup Mode To enter setup mode, power down the Model 26S, 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 (c/s, c/m, d/s, d/m, R/h, or Sv/h) are displayed.

  • Page 27: Setup Mode Operation

    4.4 Setup Mode Operation Once the Model 26S 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.
  • Page 28 Primary Count Units (Default R/hr) - Use MODE to select. Available values are dependent on the selected Primary Units: Primary Units Primary Count Units Available c/s, c c/m, c d/s, d Ludlum Measurements, Inc.
  • Page 29 4.4. SETUP MODE OPERATION Primary Units Primary Count Units Available d/m, d R/h, R Sv/h Sv/h, Sv 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.
  • Page 30 Alarm Point, the Alarm Point will be reset to 000. If the Alarm Point it set above the maximum range, the alarm point will be reset to the max- imum value allowed for that unit. Ludlum Measurements, Inc.
  • Page 31 Setting the Response Time to a fixed value is useful primarily when per- forming surveys to a fixed MDA (Minimum Detectable Activity) level. Setting the Response Time to 0 will enable the Auto-Response mode for the Model 26S (see the next parameter). Available values for the Response Time (in seconds) are: •...
  • Page 32 • On - Click Audio is enabled • OFF - Sigma Audio is enabled If no buttons are pressed for four seconds, the Model 26S 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.

  • Page 33: Safety Considerations

    The Model 26S Survey meter is marked with the following symbols: The “crossed-out wheelie bin” symbol notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding.

  • Page 34: Cleaning And Maintenance Precautions

    Be sure to take the precautions noted in the next section whenever necessary. 5.3 Cleaning and Maintenance Precautions The Model 26S 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: •...

  • Page 35: Revision History

    EVISION ISTORY This section of the manual will be updated with each revision of the Model 26S 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 37: 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 39: Maintenance And Spare Parts

    8.1 Maintenance For external cleaning of the instrument, scrub with a dampened, soapy clot. This is the only regular maintenance required. 8.2 Spare Parts Following is a list of spare parts for the Model 26S : Description Part Number AA Batteries...