MiniPuck Model ST132-06x0 Two-Wire TC/mV Transmitter
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Acromag, Inc. Tel: 248-295-0880 Email:
6
•
Output connections are not polarized. The + and
– designations are for
reference only with current normally input to and returned via
Output-.
•
Loop supply voltage should be from 7-32V DC with the minimum level
set to supply over-range current to the load, plus 7V across the
transmitter, plus any transmission line drop.
•
Variations in power supply voltage between the minimum required and
32V maximum, has negligible effect on transmitter accuracy.
•
Variations in load resistance has negligible effect on output accuracy as
long as the loop supply voltage is set accordingly.
•
Note the placement of earth ground in the current loop. This is very
important when making a connection to USB and will drive the need for
USB isolation (see below).
•
Always connect the output/power wires and apply loop power before
connecting the unit to USB.
The output of this transmitter has a floating connection relative to ground
which makes it flexible in the way it connects to
various “Receiver” devices.
In most installations, the loop power supply will be local to either the
transmitter, or local to the remote receiver. Shielded twisted pair wiring is
often used to connect the longest distance between the field transmitter and
remote receiver. The receiver device is commonly the input channel of a
Programmable Logic Controller (PLC), a Digital Control System (DCS), or a
panel meter. Some receivers already provide excitation for the transmitter
and these are referred to as “sourcing” inputs. Other receivers that do not
provide excitation are referred to as “sinking” inputs, and these will require
that a separate power supply connect in the loop.
T
1
T
2
T
3
T
4
T
5
T
6
+
-
1
+
-
OUT+
I
N
OUT
2
3
4
5
6
U
S
B
6
5
OUTPUT
TERMINALS
OUT-
+
-
+
I
DC SUPPLY
(7-32V)
+
-
MODEL ST132-0600 OUTPUT/POWER WIRING
EARTH
GROUND
I
I
NOTE: OUTPUT TERMINALS ARE NOT POLARIZED
PLUS & MINUS LABELS ARE FOR REFERENCE ONLY.
R
LOAD
-
THIS TRANSMITTER IS LOOP POWERED
4-20mA
ELECTRICAL
CONNECTIONS
Output/Power
Connections