BDDF00171 Issue 4
38/39
BD Alaris™ MRI Capsule
Electromagnetic Emissions
Recommended Separation Distances
Recommended Separation Distances for Life Support Equipment between portable and
mobile RF communications equipment and the MRI Capsule
The MRI Capsule is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled .
The user of the MRI Capsule can help prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the MRI Capsule as recommended below,
according to the maximum output power of the communications equipment .
Rated Maximum
Output Power of
Transmitter
W
Separation Distance According to Frequency of Transmitter
m
150 kHz to 80 MHz
Outside ISM bands
3 .5
d = [------]
√P
V1
150 kHz to 80 MHz
In ISM bands
12
d = [------]
√P
V2
80 MHz to 800 MHz
12
d = [------]
√P
E1
800 MHz to 2 .5 GHz
23
d = [------]
√P
E1
0 .01
0 .03
0 .12
0 .12
0 .23
0 .1
0 .11
0 .38
0 .38
0 .73
1
0 .35
1 .20
1 .20
2 .30
10
1 .11
3 .80
3 .80
7 .28
100
3 .50
12 .00
12 .00
23 .00
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in metres
(m) can be determined using the equation applicable to the frequency of the transmitter, where
P
is the maximum output
power rating of the transmitter in watts (W) according to the transmitter manufacturer .
Note 1 – At 80 MHz and 800 MHz, the separation distance for the higher frequency range apply .
Note 2 – The ISM (Industrial, Scientific, and Medical) bands between 150 kHz and 80 MHz are 6 .765 MHz to 6 .795 MHz; 13 .553 MHz to
13 .567 MHz; 26 .957 MHz to 27 .283 MHz; and 40 .66 MHz to 40 .70 MHz .
Note 3 – An additional factor of 10/3 is used in calculating the recommended separation distance for transmitters in the ISM frequency
bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2 .5 GHz to decrease the likelihood that mobile/portable
communications equipment could cause interference if it is inadvertently brought into patient areas .
Note 4 – These guidelines may not apply in all situations . Electromagnetic propagation is affected by absorption and reflection from
structures, objects, and people .
