MiniPuck Model ST132-06x0 Two-Wire TC/mV Transmitter
_________________________________________________________________________________
______________________________________________________________________________________
Acromag, Inc. Tel: 248-295-0880 Email:
8
!
This transmitter is setup, configured, and calibrated via configuration
software that runs on a Windows-based PC that is connected to the unit via
USB. Refer to the drawing below to connect your PC or laptop to the
transmitter for the purpose of reconfiguration and calibration using this
software.
WARNING
– USB Connector is not for operational or maintenance use
in hazardous locations.
The intent of mating USB with this transmitter is
so that it can be conveniently setup and calibrated in a safe area, then
installed in its connection head, which may be in a hazardous area. Do not
attempt to connect a PC or laptop to this unit while installed in a hazardous
environment, as USB energy levels could ignite explosive gases or particles
in the air.
•
USB Signal Isolation Required (See Below) -
You may use Acromag
model USB-ISOLATOR to isolate your USB port, or you can optionally
use another USB signal isolator that supports USB Full Speed operation
(12Mbps).
•
Configuration Requires USB and Loop Power
- This transmitter
draws power from both the current loop and from USB during setup.
•
Connect Loop Power Before USB
- Always connect the transmitter to
its loop power supply before connecting USB, or erratic operation may
result.
IMPORTANT:
All USB logic signals to the transmitter are referenced to the
potential of its internal signal ground. This internal ground is held in
common with the USB ground and shield ground. The potential of the
transmitter’s current output pin (output minus) relative to earth ground will
vary according to the load current and load resistance (net IR drop).
Without isolation, this IR voltage drop would drive a potential difference
between the normally grounded current loop and the grounded USB
connection at the PC, causing a ground loop that would inhibit setup and
calibration, and may even damage the transmitter. This is why an isolated
USB connection is recommended. You could alternately avoid the use of an
isolator if a battery powered laptop was used to connect to the transmitter,
and the laptop has no other earth ground connection.
USB Connections
ELECTRICAL
CONNECTIONS
USB Connections