65
9900 Transmitter
If the 9900 Base Unit will be mounted in a panel, plug-in modules
may be installed either before or after the base unit is mounted.
If the 9900 Base Unit will be mounted using the accessory wall
mount kit
(3-9900.392)
, install plug-in modules
fi
rst.
If the Direct Conductivity/Resistivity Module will be included in
your unit, install the H COMM module
fi
rst and then install
Conductivity/Resistivity Module over the H COMM Module.
To install the H COMM module, carefully align the module pins
into its plug (see illustration) and push the module straight in until
the tabs on the bottom edge snap into place.
To uninstall, squeeze tabs, grasp the module and pull straight out.
3-9900.395
H COMM Module
DC Power
Loop V
oltage
–
+
+
–
PLC
Device
Optional ammeter
(recommended for
4 to 20 mA trim only)
Power
Supply
9900 Device
Connections
Loop +
Loop –
(Primary HART Master)
Hand-held device
(Secondary HART Master)
Red
Black
Connecting HART with a Loop-powered sensor
(Typical installation)
–
+
Power
Supply
Loop +
Loop –
250
Load Resistor
Hand-held device
(HART Master)
9900 Device
Connections
Red
Black
Connecting HART to a Hand-Held Master Device
(Typical installation)
Be careful
not to bend the pins when installing or
removing the module to or from the base unit.
NOTE:
The black rubber jumper adjacent to the power terminal should only be removed when both
the H COMM Module is utilized and the required sensor cable length is over 304 m (1000 ft).
H COMM Module Installation
H COMM Module Wiring