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Chapter 4: Specifications
Note: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.
a
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and
land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted
theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an
electromagnetic site survey should be considered. If the measured field strength in the location in which the
hemodialysis device is used exceeds the applicable RF compliance level above, the hemodialysis device
should be observed to verify normal operation. If abnormal performance is observed, additional measures
may be necessary, such as reorienting or relocating the hemodialysis device.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
4.8.3
Recommended separation distances between portable and mobile RF
telecommunication devices and the device
Safety distances by output power rating of the transmitter
Recommended separation distances between portable and mobile RF telecommunication devices and
the hemodialysis device
The hemodialysis device is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or user of the hemodialysis device can contribute to avoiding electromagnetic errors,
by adhering to the minimum distance between portable and mobile HF telecommunications devices (transmitters)
and the hemodialysis device – dependent on the exit performance of the communication device, as indicated
below.
Rated maximum output
power of transmitter
W
0.01
0.1
1
10
100
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: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.
4-10
Separation distance according to frequency of transmitter m
150 kHz to < 80 MHz
d = 1.17 P
0.12
0.37
1.2
3.7
12
Fresenius Medical Care 4008 S (Version V10) SM-EN 7/01.13
80 MHz to < 800 MHz
d = 1.17 P
0.12
0.37
1.2
3.7
12
800 MHz to 2.5 GHz
d = 2.34 P
0.23
0.74
2.3
7.4
23
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