32
The Interface Solution Experts
THZ
2
&
TDZ
2
Programmable Smart HART
Temperature Transmitter and Display
Installation
Installation consists of physically mounting the unit
and completing the electrical connections.
Mounting the THZ
2
or TDZ
2
The THZ
2
HPP fits inside a 30-35mm connection head
(such as the LH1) using captive mounting screws. The
THZ DIN
2
can be mounted on standard DIN mounting
rails. The TDZ
2
HP can be mounted with rails, flanges,
or in one of our larger housings, such as the D-BOX or
BH.
Making the Electrical Connections
The connections for the various inputs are shown in
Figures 7 and 8. The figure shows a single transmitter.
If you are using multiple units, connect them using the
connections shown in Figure 17.
In multi-drop networks, the unit’s receiving device is
normally a HART-communicating control system
acting as the HART Primary Master. The control
system uses each transmitter’s individual address to
access real-time process data, sensor diagnostics
and THZ
2
or TDZ
2
diagnostic data. The address is
also used to locate the appropriate unit, to initiate
configuration and to calibrate. A HART communicator,
acting as the HART Secondary Master, can be used to
simultaneously access information from, or transmit
configuration information to the transmitter from
anywhere along the HART digital link.
Make sure that the total loop resistance is at least
250 ohms so that the 4-20mA signal containing the
HART protocol is not shorted. If loop resistance is
less than 250 ohms, add a resistor.
Recommended Ground Wiring
Practices
Moore Industries recommends the following ground
wiring practices:
• Any Moore Industries product in a metal case or
housing should be grounded.
• The protective earth conductor must be connected
to a system safety earth ground before making
other connections.
• All input signals to, and output signals from,
Moore Industries’ products should be wired using
a shielded, twisted pair wiring technique. Shields
should be connected to an earth or safety ground.
• For the best shielding, the shield should be run
all the way from the signal source to the receiving
device. (see Note below)
• The maximum length of unshielded input and
output signal wiring should be 2 inches.
Note:
Some of Moore Industries’ instruments can be
classified as receivers (IPT
2
, IPX
2
, etc.) and some
can be classified as transmitters (TRX, TRY, etc.)
while some are both a receiver and a transmitter
(SPA
2
, HIM, etc). Hence, your shield ground
connections should be appropriate for the type
of signal line being shielded. The shield should
be grounded at the receiver and not at the signal
source.
Switches and Circuit Breakers
A switch or circuit breaker must be wired in series
with the AC power conductors. The switch or circuit
breaker used must be located within three meters of
the unit.
WARNING:
Terminals on this unit may be connected to
hazardous voltages. Before making ANY
connections to this unit, ALL hazardous voltages
must be de-energized.
The circuit breaker or switch will only remove power to
the unit, hazardous voltages may still be connected to
other terminals on the unit.
Installation Category
All of Moore Industries’ terminals are rated CAT II,
except those with the -RF option. These terminals are
rated CAT I.
