Related Manuals for Ludlum Measurements 25
Summary of Contents for Ludlum Measurements 25
- Page 1 LUDLUM MODEL 25 AND 25-1 PERSONAL RADIATION MONITOR USER’S MANUAL October 2014 Serial Number 25000100 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 25 AND 25-1 PERSONAL RADIATION MONITOR USER’S MANUAL October 2014 Serial Number 25000100 and Succeeding Serial Numbers...
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Page 5: Table Of Contents
Model 25 and 25-1 Personal Radiation Monitor User’s Manual Table of Contents Introduction Getting Started Unpacking and Repacking Battery Installation Instrument Operational Test Instrument Use and Controls Distinguishing ALERTs and ALARMs Specifications Calibration and Changing Parameters Calibration Overview Entering SETUP Mode and Changing Parameters... -
Page 6: Introduction
(liquid crystal display), a bright (daylight-visible) warning light, and a piercing audio warning. The unit body is made of lightweight but durable plastic and can survive brief immersion in water. The Model 25 may be clipped to a belt or worn around the neck with a lanyard. -
Page 7: Getting Started
(lanyard, case, etc.) 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 25 serial number is located on the back panel below the battery compartments. - Page 8 The detector's position is marked by the small plus (+) sign on the front panel of the Model 25. A typical 1 µCi (37 kBq) Cs check source will produce an exposure rate of approximately 3 mR/hr (.003 mSv/h).
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Page 9: Instrument Use And Controls
Section 2 Instrument Use and Controls With only two front-panel buttons, the Ludlum Model 25 is simple and easy to use with minimal training required. Under typical use, the display shows just the current exposure rate. Whenever the MODE button is pressed, or... - Page 10 Model 25 and 25-1 Personal Radiation Monitor User’s Manual Section 2 Figure 1: The Exposure Rate Screen shows typical background radiation rate and the low- battery icon. In order to “zero” the accumulated dose, the Zeroing Accumulated Dose: user must enter the setup mode, and then not press any other buttons. The parameters will change every four seconds, and the unit will return automatically to the normal mode after the last parameter is presented.
- Page 11 OVER icon: exceeded, the OVER icon is activated. This is to alert the user that the Model 25 Radiation Monitor is out of range. The display will also flash the maximum displayed value (9.99 Sv/h or 999 R/hr). Ludlum Measurements, Inc.
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Page 12: Distinguishing Alerts And Alarms
Model 25 and 25-1 Personal Radiation Monitor User’s Manual Section 2 Distinguishing ALERTs and ALARMs There are four independent radiation alarms: Exposure Rate ALERT: distinguished by the word ALERT in the exposure rate display and a slow, single beep of the audio. -
Page 13: Specifications
2 seconds or less from <1 to 50 mR/hr (0.5 mSv/h) Energy Dependency: within 15% of true value (60 keV to 3MeV) Maximum Accumulated Dose: limited by display, 999 R for the Model 25 and 9.99 Sv for the Model 25-1 Display: backlit 1.3 cm (0.5 in.) digits with readings from .001 to 999, or from... - Page 14 Model 25 and 25-1 Personal Radiation Monitor User’s Manual Section 3 End-of-Battery Life Warning: At approximately 2.3 Vdc, the low-battery symbol is displayed on the front-panel LCD, indicating that eight hours of use remain. Below 2.0 Vdc, the unit may abruptly turn off (blank the display).
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Page 15: Calibration And Changing Parameters
Calibration 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 16: Entering Setup Mode And Changing Parameters
Entering Setup Mode To enter setup mode, power down the Model 25, then turn the unit back ON. When “0.00 mR/hr” (“.000 mSv/h”) appears on the LCD, press the MODE button three times within four seconds to enter Setup Mode. You will know that the unit is in SETUP mode when the display suddenly changes to “10... -
Page 17: Calibration Procedure
When the desired Rate Alert Setpoint is displayed, simply wait for four seconds. The Model 25 will then switch to the next parameter (Rate Alarm Setpoint in this case). NOTE: If no buttons are pressed for four seconds, the Model 25 will switch to the next parameter, and if on the last parameter, will save the parameters and exit SETUP mode. - Page 18 Model 25 and 25-1 Personal Radiation Monitor User’s Manual Section 4 200 mR/hr (2 mSv/h) and 800 mR/hr (8 mSv/h) 2 R/hr (0.02 Sv/h) and 8 R/hr (0.08 Sv/h) 20 R/hr (0.2 Sv/h) and 80 R/hr (0.8 Sv/h) ...
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Page 19: Safety Considerations
Ludlum Measurements, Inc. The Model 25 Survey Meter 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 20: 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 25 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 21: Revision History
Revision History NOTE: This section of the manual will be updated with each revision of the Model 25 in order to document changes over time. Ludlum Measurement’s policy is to provide free software upgrades to instruments for the life of the instrument. -
Page 22: Recycling
Each material must be separated. On the Model 25, the symbol will be placed on the serial number label located on the back panel of the instrument.
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