Fluke 481 Operator's Manual
  1. Manuals
  2. Brands
  3. Fluke Manuals
  4. Measuring Instruments
  5. 481
  6. Operator's manual
Fluke 481 Operator's Manual

Fluke 481 Operator's Manual

Ion chamber survey meter
Hide thumbs Also See for 481:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Operator's Manual
481
Ion Chamber Survey Meter
Operators Manual
April 2011
© 2011 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
MyFlukeStore
1.877.766.5412
www.
.com
Shop for Fluke products online at:

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 481 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Fluke 481

Summary of Contents for Fluke 481

  • Page 1 Ion Chamber Survey Meter Operators Manual April 2011 © 2011 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.

  • Page 3: Table Of Contents

    Table of Contents Title Page Introduction......................1 How to Contact Fluke ..................1 Features......................2 Overrange Rate....................2 Low Battery Indicator..................2 Audio Alarm....................2 Integrate Mode....................3 Freeze Mode ....................3 Auto-On Backlight ..................3 Specifications..................... 3 Receiving Inspection..................5 Operation ......................
  • Page 4 Operators Manual MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...

  • Page 5: Introduction

    The auto-on circuit for the backlight is enabled when twilight conditions occur. The 481 has an audio alarm that can be set by the user. Two nine-volt batteries, located in the back of the instrument, provide over 200 hours of continuous operation.

  • Page 6: Features

    The following sections describe the features of the Survey Meter. Overrange Rate If the instantaneous radiation rate measured by the Model 481 exceeds 50 R/h (0.5 Sv/h), the 'R' in R/h or the 'Sv' in Sv/h displayed will blink to notify the user that the radiation field exceeds the measuring capability of the instrument.

  • Page 7: Integrate Mode

    Radiation Detected ..........Beta above 100 keV, gamma above 7 keV Operating Ranges ..........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 Sv/h, 0 to 500 Sv/h, 0 to 5 mSv/h, 0 to 50 mSv/h, 0 to 500 mSv/h Accuracy..............
  • Page 8 Audio Alarm............Set through communication programs. Setting at 1% increments, 1 % to 100 % full scale Temperature Sensor ..........A temperature sensor in the 481-DE-SI is used to adjust for offset drift due to temperature. Readings are not corrected for changes in air density due to pressure and temperature Check Source ............

  • Page 9: Receiving Inspection

    2. Check that all items listed on the packing slip are present and in good condition. If damage is evident, make a claim with the carrier and contact Fluke immediately. If items are missing, contact Fluke. See the How to Contact Fluke section in this manual.

  • Page 10: Mode Button

    For example, assume the scale units appear as 10, 20, 30, 40, 50, and the freeze bar is at 47 mR/h on the bar graph. If the 481 then measures a radiation field of 120 mR/h, the scale units will change to 100, 200, 300, 400, 500, and the freeze bar will appear on the graph at 120 mR/h.

  • Page 11: Installation

    2. When “CO” appears on the 481 display, press the computer or terminal space bar twice. If the Model 481 displays the “CO” message but there is no response at the terminal after pressing the space bar twice, perform the following tests: Be sure that the 481 and terminal are properly connected via the RS-232 cable.
  • Page 12 2 MeV through the sliding Phenolic shield. It can also be used for x-ray in the energy range of 7 keV to 30 keV with the sliding shield open. The Model 481 responds to, but is not calibrated for, beta radiation, with the slide open. Beta energies that can be measured are above 100 keV.

  • Page 13: Maintenance

    The display will indicate HI for good chamber voltage bias condition. The program in the 481 ROM is proprietary to Fluke. The firmware version appears in the digital part of the LCD display (prior to the “all elements on” display) when the instrument is turned on.

  • Page 14: Storage

    1. Remove the 9-volt batteries to be sure that the instrument will remain off during the disassembly process. 2. Remove the 4 screws from the case top. 3. Carefully remove the case bottom from the thick gasket that seals the top and bottom. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...

  • Page 15: Outer Mylar Window Replacement

    6. Reinstall the cap and install the desiccant vial into the unit by slipping it into the clamp. 7. Secure the case top to the case bottom, with the gasket in between, using the four MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...

  • Page 16: Lithium Cell Replacement

    6. Secure the battery board to the survey meter assembly with the 4 screws and lock washers removed in step 4. 7. Secure the case top to the case bottom, with the gasket in between, using the four screws removed in step 2. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...

  • Page 17: Replaceable Parts Information

    8. Replace the 9-volt batteries, being sure to observe proper polarity. Replaceable Parts Information Fluke maintains a complete inventory of all normal replaceable parts. To place an order, or to obtain information concerning replaceable parts, contact Fluke. See the How to Contact Fluke section in this manual.

  • Page 18: Troubleshooting

    Remove desiccant and bake per the instructions in the Desiccant Regeneration section of this manual. After replacement, bake unit at 50 C for 8 hours. Erratic Readings Check for broken ion chamber window or loose collector. Check for loose chamber bias connector. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...

Table of Contents