13
Recommended separation distances between portable and mobile communications equipment and the ventilator 170.
The 170 ventilator is intended for use in an electromagnetic environment in which radiated RF disturbance is controlled. The customer or the user of the 170
ventilator may prevent electromagnetic interference by maintaining a minimum distance between the communications equipment radio frequency (RF)
Portable and mobile equipment (transmitters) and the 170 ventilator, as described below and in accordance with the maximum output power of the
communication device
Maximum output power rating
of the transmitter
Separation distances according to frequency of transmitter (m)
(W)
From 150 kHz to 80 Mhz
Inside and outside ISM bands
d = 0,583x
√P
From 80 Mhz to 800 Mhz
d = 1,2x
√𝑃
From 800 Mhz to 2,7 Ghz
d = 2,3x
√𝑃
0,01
0.058
0,12
0.23
0,1
0.184
0,38
0.73
1
0.583
1,2
2.3
10
1.844
3,8
7,3
100
5.83
12
23
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.
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.
Guide and Manufacturer's Declaration
Immunity to proximity fields from RF wireless communications equipment
Test frequency (MHz)
Modulation
Immunity level (V/m)
385
Pulse modulation
(1)
at 18Hz
27
450
FM
(2)
±5Hz deviation 1kHz sine
28
710
Pulse modulation
(1)
at 217Hz
9
745
Pulse modulation
(1)
at 217Hz
9
780
Pulse modulation
(1)
at 217Hz
9
810
Pulse modulation
(1)
at 18Hz
28
870
Pulse modulation
(1)
at 18Hz
28
930
Pulse modulation
(1)
at 18Hz
28
1720
Pulse modulation
(1)
at 217Hz
28
1845
Pulse modulation
(1)
at 217Hz
28
1970
Pulse modulation
(1)
at 217Hz
28
2450
Pulse modulation
(1)
at 217Hz
28
5240
Pulse modulation
(1)
at 217Hz
9
5500
Pulse modulation
(1)
at 217Hz
9
5785
Pulse modulation
(1)
at 217Hz
9
The carrier shall be modulated using a 50 % duty cycle square wave signal.
As an alternative to FM modulation, 50 % pulse modulation at 18 Hz may be used because while it does not
represent actual modulation, it would be worst case.
If the environmental conditions are appropriate, is possible to install the device verifying that:
The installation floor is leveled and strong enough to withstand accelerations and vibrations to which the device could be subjected
during use on the medical vehicle. It’s suggested the use of a backplate.
The medical gas supply system has been regularly serviced or, in case of initial startup, the periodic maintenance has been programmed.
Fittings, pipes and all means of connection used in the system, are built according to the specific applicable standards.
Verify that purchased tubes and fittings respect the same standard requested for the device.
Distances between other electrical and electronic devices are like described in this manual.
The positioning of the device does not cause any type of obstruction inside the medical vehicle.
The power supply has the characteristics described in this manual. The pressure and flow delivered from the medical gas supply system,
have the characteristics specified in this manual.
The device must be installed using the dedicated surfaces on the lower side of the main body. Other fixation devices are available upon
request.
Any other type of installation, precludes the safety and functionality of the device.