202D-M-V3.1
Intrinsic Safety Connections
31
8. INTRINSIC SAFETY
CONNECTIONS
When installing the Model 202Di in hazardous areas, the wiring and
installation must comply with appropriate installation standards.
The approval uses entity parameters on the input for connections to the
flowmeter and associated apparatus type approval for the 4-20mA output.
The 4-20mA output must, therefore, only be connected to barriers with the
specified safety parameters as shown on the following page.
8.1 COILS
The Model 202Di will connect directly to a turbine flowmeter or paddlewheel
with a certified Intrinsically Safe (IS) coil or other certified IS sensor which
produce a pulse input provided they do not exceed the following input
parameters:
Ui = 24V
Ii = 20mA
Pi = 320mW
The maximum allowed capacitance and inductance of the pulse or coil
including the cabling is:
Cext = 20µF
Lext = 1.5H
The internal capacitance and inductance of the Model 202Di seen on the input
are negligibly small with Ci = 0.02uF and Li = 0mH. The maximum voltage and
current produced by the Model 202Di on its inputs (terminals 8 & 7) are:
Uo = 10.0V (open circuit)
Io = 9.0mA (short circuit)
Po = 23mW
To Next Page
Loading...
