Fluke Biomedical 451B - Manual (Page 17)

Ion Chamber Survey Meter
Specifications
7
Environmental ....................................................... Operating Temperature Range: -20 ºC to 50 ºC
Relative Humidity Range: 0 % to 95 % non-condensing
Geotropism: less than 1 %
Altitude 2000 m
For Indoor use
Dimensions (L x W x H) ........................................ 8 ⅝ in x 4 ½ in x 8 in (21.6 cm x 11.3 cm x 20 cm)
Weight .................................................................... Approximately 2 lb, 9 oz (1.16 kg)
Batteries ................................................................. Two 9 volt batteries (NEDA 1604A or 6LR61 or 6AM6) provide over
200 hours continuous operation. Three lithium cells provide chamber
bias voltage of 63 V (10-year life expectancy)
Audio Alarm ........................................................... Set through communication programs. Setting at 1 % increments, 1 %
to 100 % full scale
Temperature Sensor ............................................. A temperature sensor in the 451B-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 ........................................................ Model 450UCS (item number 3267644), allows user to check for
proper instrument operation. Gives a nominal reading of 0.4 mR/h
(4 µSv/h)
IP Rating ................................................................ IEC 60529: IP40
Safety ..................................................................... IEC 61010-1: Pollution Degree 2
Electromagnetic Environment ............................. IEC 61326-1: Portable
Emissions Classification...................................... IEC CISPR 11: Group 1, Class A.
Group 1 ISM equipment: group 1 contains all ISM equipment in which
there is intentionally generated and/or used conductively coupled
radio-frequency energy which is necessary for the internal functioning
of the equipment itself. Class A equipment is equipment suitable for
use in all establishments other than domestic and those directly
connected to a low voltage power-supply network which supplies
buildings used for domestic purposes.
* Specifications are subject to change without notice.
Dose equivalent units were determined using conversion coefficients at H*(10), found in ICRU 47,
April, 1992.
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0 0 0 0 1 0 0 0 1 0 0 1 0 1
Energy (keV)
Indicated / Actual
Side
Slide-Closed
Slide-Opened
hmr02.eps
Figure 2. Model 451B-DE-SI Typical Energy Dependence