www.miinet.com
Moore Industries-International, Inc.
- 33 -
User’s Manual
238-760-00K
May 2019
Functional Safety Dual Input Smart HART® Temperature Transmitter
STZ
Input/Output Wiring
The Input/Output connections can be made with 14 to 24 AWG (2.5mm
2
to 0.2mm
2
) wire.
The end of each conductor should be stripped no more than 0.25in (7mm).
Tighten the screws on the terminal block to 4.4 - 5.3 lbf
•
in (0.5 - 0.6 N
•
m).
Power Supply Wiring
All power connections should be made with 14 or 16 AWG (2mm2 or 1.3mm2) wire. The end
of each conductor should be stripped no more than 0.25in (7mm). The end of the stripped wire
should be tinned with solder, or inserted into a ferrule and crimped before being placed into a
terminal block. Tighten the screws on the terminal block to 4.4 - 5.3 lbf/in2 (0.5 - 0.6 N/m2).
Protective Earth Conductor
The Protective Earth Conductor shall be of equal or larger size wire than the other two power
conductors. The Protective Earth Conductor shall be the first conductor connected to the unit
when the unit is being wired. It shall be the last conductor removed when the unit is being un-
wired.
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 un-shielded input and output signal wiring should be 2 inches.
Note:
Some of Moore Industries’ instruments can be classified as receivers (IPT2, IPX2, etc.)
and some can be classified as transmitters (TRX, STZ etc.) while some are both a receiver and
a transmitter (SPA2, 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.
CE Certification-related Guidelines
The grounding and wiring practices described above must be followed in order for the unit(s) to
meet the requirements set forth in EMC standard EN61326.
SECTION 3
