Richmar HydraThermDT - Page 22

RECOMMENDED SEPARATION DISTANCES BETWEEN PORTABLE AND MOBILE
RF COMMUNICATIONS EQUIPMENT AND THE E360T-SY-IN Ventilator
The Hydratherm tank is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or the user of the Hydratherm
tank can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the
Hydratherm tank 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
150kHz to 80MHz
outside ISM bands
80 MHz to
800 MHz
800 MHz to
2,5 GHz
P
d = 3,5
Pd 2.1=
Pd 3.2=
0.01
0,35
0.12 0.23
0.1
1,1
0.38 0.73
1
3,5
1.20 2.30
10
11 3.80 7.30
100
35
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 applies.
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.
APPENDIX A - EMC TABLES
150kHz to 80MHz
in ISM bands
P
d = 12
1,2
3,8
12
38
120
NOTE 3 An additional factor of 10/3 has been incorporated into the formulae 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.
Table 4 – Recommended separation distances between portable and mobile RF
communications equipment and the equipment and system – for equipment and
systems that are life supporting
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