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| Catalog: 4022258 | UPC: 095969600941 | Model: Fluke 481-DESI
High Sensitivity Pressurized Ion Chamber Survey Meter (Sv and Sv/h)
List Price: $3,299.00
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The 481-DESI state-of-the-art ion chamber survey meter is a handheld battery operated unit designed for use in both rugged and normal environments. Ideally suited for area monitoring to ensure radiation worker safety, the 481-DESI provides precise, mSv, measurements of Deep-Dose Equivalent (ambient dose equivalent, H*(10)) exposure as defined by the United States Nuclear Regulatory Commission and International Commission on Radiation Units & Measurements. The 481-DESI auto-ranges and measures radiation rate and accumulated dose from various radiation sources (beta, x-ray and gamma). The ion chamber detector allows for a fast response time to radiation from leakage, scatter beams, and pinholes. Additionally, the low-noise chamber bias supply provides for fast background-settling time.
The digital display features an analog bar graph, 2.5 digit readout, low battery indicator, freeze (peak hold) mode indicator and an automatic backlight function. User controls consist of an ON/OFF button and a MODE button. The case is constructed of lightweight, high strength materials and is sealed against moisture.
The RS-232 interface can be connected directly to a computer for use with the Excel add-in for Windows (451EXL), enhancing the functionality of the instrument. This software allows for data retrieval, user parameter selection and provides a virtual instrument display with audible and visual alarm indication.
What is the difference between the model 481 and 481-DESI?
Answers (1) - Asked by Anonymous
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There are two versions of the Fluke 481 Ion Chamber Survey Meter available, the Fluke 481 and the Fluke 481-DESI.The Fluke 481-DE-SI has a temperature sensor that is used to adjust for offset drift due to temperature. Please note that readings are not corrected for changes in air density due to pressure and temperature.
Also, the operating ranges, detector, and response time between the two models differ, as follows:
481: 0 to 5 mR/h, 0 to 50 mR/h, 0 to 500 mR/h, 0 to 5 R/h, 0 to 50 R/h
481-DE-SI: 0 to 50 µSv/h, 0 to 500 µSv/h, 0 to 5 mSv/h, 0 to 50 mSv/h,
0 to 500 mSv/h
481: 349 cc volume air ionization chamber; phenolic chamber wall
246 mg/cm2. Chamber window is composed of 6.6 mg/cm2 Mylar. A
coating of graphite has been applied to the walls to make them
conductive. The collection potential is -63 Volts. The Chamber is
vented through the desiccant
481-DE-SI: In order to achieve energy response consistent with
measurements of H*(10) as required by ICRU report 47, aluminum has
been added to the back wall, 38 % of the side wall area, and to the
beta slide. With the Beta Shield open, the 481 can measure skin dose
at H* (0.07), and Deep Dose H* (10) with the Beta shield closed.
Time measured from 10 % to 90 % of final value for a step
increase/decrease in radiation rate such that a range change does not
481: 0 to 5 mR/h, range: 8 seconds. 0 to 50 mR/h, range: 2.5 seconds.
0 to 500 mR/h range: 2 seconds. 0 to 5 R/h, range: 2 seconds. 0 to
50 R/h, range: 2 seconds
481-DE-SI: 0 to 50 µSv/h, range: 8 seconds. 0 to 500 µSv/h, range:
2.5 seconds. 0 to 5 mSv/h, range: 2 seconds. 0 to 50
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Answered by Anonymous
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