Instruction Manual
Appendix JX Rev. 1.0
January 1997
J-4 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
INSTALLATION
Consult Safety Data Sheet 1M03296
before performing any work on the
CENELEC approved IFT 3000.
Install all protective equipment covers
and safety ground leads after installa-
tion. Failure to install covers and
ground leads could result in serious
injury or death.
J-4 HART COMMUNICATOR SIGNAL LINE
CONNECTIONS
The HART Communicator can connect to the
IFT analog output signal line at any wiring
termination point in the 4-20 mA current loop.
There are two methods of connecting the HART
Communicator to the signal line. For applica-
tions in which the signal line has a load resis-
tance of 250 ohms or more, refer to method 1.
For applications in which the signal line load re-
sistance is less than 250 ohms, refer to method
2.
a. Method 1, For Load Resistance > 250
Ohms
Refer to Figure J-2 and the following steps
to connect the HART Communicator to a
signal line with 250 ohms or more of load
resistance.
HART connections must be made out-
side of the hazardous area. Because
the HART option is not protected by
energy limiting barriers, it must not be
interfaced from within a hazardous
area. The signal cables should be
routed outside the hazardous area and
the connections made external to the
hazardous area.
Explosions can result in death or seri-
ous injury. Do not make connections
to the HART Communicator's serial
port or NiCad recharger jack in an ex-
plosive atmosphere.
1. Program IFT analog output to 4-20 mA.
Select the current mode using the cur-
rent/voltage selector switch on the mi-
croprocessor board in the IFT.
2. Using the supplied lead set, connect
the HART Communicator in parallel to
the IFT 3000. Use any wiring termina-
tion points in the analog output 4-20
mA signal line.
b. Method 2, For Load Resistance < 250
Ohms
Refer to Figure J-3 and the following steps
to connect the HART Communicator to a
signal line with less than 250 ohms load re-
sistance.
1. Program IFT analog output to 4-20 mA.
Select the current mode using the cur-
rent/voltage selector switch on the mi-
croprocessor board in the IFT.
2. At a convenient point, break the analog
output 4-20 mA signal line and install
the optional 250 ohm load resistor.
3. Plug the load resistor into the loop
connectors (located on the rear panel
of the HART Communicator).
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