Fluke 481-DESI Ion Chamber Survey Meter

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Specifications: Fluke 481 DESI Ion Chamber Survey Meter

General specifications
Radiation detected	Beta > 100 keV
Radiation detected	Gamma > 7 keV
Operating ranges	0 mR/h to 5 mR/h (8 sec) 0 mR/h to 50 mR/h (2.5 sec) 0 mR/h to 500 mR/h (2 sec) 0 R/h to 5 R/h (2 sec) 0 R/h to 50 R/h (2 sec)
Accuracy	Within 10% of readings between 10% and 100% of full scale indication on any range, exclusive of energy response
Detector	Chamber (cc volume air ionization) 349 cc
	Chamber wall (phenolic) 246 mg/cm²
	Chamber window (mylar) 6.6 mg/cm²
	Beta slide 440 mg/cm²
Automatic features	Auto-zeroing, auto-ranging, and auto-backlight
Power requirements	Two 9 V alkaline, 200 hours operation
Warm-up time	One minute
Battery life	Four+ hours continuous use per battery pack (assumes 50% brightness of LCD)
Dimensions (W x D x H)	10 x 20 x 15 cm (4 x 8 x 6 in)
Weight	1.11 kg (2.5 lb)
Display LCD analog/digital with backlight
Analog	100 element bar graph 6.4 cm long. Bar graph is divided into 5 major segments, each labeled with the appropriate value for the range of the instrument
Digital	2.5 digit display is followed by a significant zero digit depending on the operating range of the instrument. The units of measurement are indicated on the display at all times. Digits are 6.4 mm (0.25 in) high. Low battery and freeze indicators are also provided on the display
Modes
Integrate mode	Operates continuously 30 seconds after the instrument has been turned on. Integration is performed even if the instrument is displaying in mR/h or R/h
Freeze mode	Will place a tick mark on the bar graph display to hold on the peak displayed value. The unit will continue to read and display current radiation values
Environmental
Temperature range	-4°F to 122°F
Relative humidity	0% to 100% (at 140°F)
Geotropism	< 1%