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256 ST 3000 Release 300 and SFC Model STS103 User’s Manual 6/08
D.1 North American Classification of Hazardous
Locations,
Continued
Intrinsically Safe
Apparatus
Parameters
The Apparatus Parameters are defined as follows.
Parameter Description
Vmax Maximum safe voltage that can be applied to the apparatus
terminals.
Imax Maximum safe current that can be applied to the apparatus
terminals.
Ci Unprotected capacitance in the apparatus that can be
considered present at the terminals.
Li Unprotected inductance in the apparatus that can be
considered present at the terminals.
Associated Apparatus
Parameters
The Associated Apparatus Parameters are defined as follows.
Parameter Description
Voc Maximum output voltage that can be delivered to the
hazardous (classified) location. This voltage is the maximum
from a single channel.
Isc Maximum output current that can be delivered to the
hazardous (classified) location. This current is the maximum
from a single channel.
*Vt Maximum output voltage that can be delivered to the
hazardous (classified) location. This voltage is the maximum
across any combination of terminals of a multiple channel
configuration.
*It Maximum output current that can be delivered to the
hazardous (classified) location. This current is the maximum
through any combination of terminals of a multiple channel
configuration.
Ca Maximum capacitance that can be connected to the
apparatus.
La Maximum inductance that can be connected to the apparatus.
*CSA does not recognize these parameters at this time.
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