Directions for use 25
Replacement Parts and Accessories
To order replacement parts and accessories, please contact the Welch Allyn office nearest
to you.
Recommended separation distances between portable and mobile RF communications equipment
and the Welch Allyn SureTemp Plus
The device is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or user of the
Welch Allyn thermometer can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the device as recommended below, according to the maximum output power of the
communications equipment.
Separation distance according to frequency of transmitter (m)
Rated maximum
output power of
transmitter (W)
150 kHz to 80 MHz
d = (1.17)
80 MHz to 800 MHz
d = (1.17)
800 MHz to 2.5 GHz
d = (2.23)
0.01 0.11667 0.11667 0.23333
0.1 0.36894 0.36894 0.73785
1 1.1667 1.1667 2.3333
10 3.6894 3.6894 7.3785
100 11.667 11.667 23.3333
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be estimated
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: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects, and people.
P P P
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