Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: 248-295-0880
- 18 -
http://www.acromag.com
- 18 -
https://www.acromag.com
TECHNICAL REFERENCE
OPERATION STEP-BY-STEP
Connections
This section will walk you through
the Connection-Configuration-
Calibration process step-by-step.
But before you attempt to
reconfigure or recalibrate this
transmitter, please make the
following electrical connections
Note:
For best results, your input signal source and output meter must be accurate
beyond the unit specifications, or better than ±0.1%. A good rule of thumb is to
ensure that your equipment accuracy be four times better than the rated accuracy
you are trying to achieve with this transmitter (i.e. ±0.025% accurate to achieve
±0.1% accuracy).
1. Connect Input:
Refer to Input Connections Drawings on page 7-9 for your
model. Note that each channel has two input paths, each supporting a
different nominal range. For DT236 models at TB1/TB3, connect a precision
current source to path A, or a precision voltage source to path B, as applicable
to your selected range (signal return is the middle terminal). Your signal source
must be adjustable to nominal range zero and full-scale values.
2. Connect Output/Power (each Output):
Refer to Output/Power Connection of
page 10 and wire an output current loop to the transmitter as illustrated (both
loops if you are using both channels with the unit in splitter or dual transmitter
mode). All modes must connect power to output 1, which drives power to the
unit microcontroller. You will need to measure the output current accurately
at each output to calibrate the unit. You could connect a current meter in
series in each output loop to read the loop current directly (not
recommended). Alternatively, you could simply connect a voltmeter across a
series connected precision load resistor in each loop, and accurately read the
output current as a function of the IR voltage drop produced in the resistor
(recommended). In any case, be sure to power each loop with a voltage that is
minimally greater than the 7V required by the transmitter, plus the IR drop of
the wiring and terminals, plus the IR drop in the load (be sure to use a current
level that considers the over-scale current as follows: Loop Voltage= 7V+
0.024*Rload with negligible line drop). In this model, output channel 1 powers
the unit’s microcontroller and input channel 1 while output channel 2 only
powers input channel 2. Always apply power to at least output loop 1, even
when connected to USB.
3. Connect to PC via isolated USB:
Refer to USB Connection Drawing on page 13
and connect the transmitter to the PC using a USB isolator and cables provided
in the Configuration Kit TTC-SIP. Optionally, you could instead connect the unit
to an Android smartphone or tablet running the Agility mobile app uses a USB-
OTG cable.
Now that you have made your input, output/power, and USB connections, and
applied power to your output loop(s), you can execute the DT236Config.exe,
DT237Config.exe, or DT238Config.exe software per your transmitter model to
begin configuration of your unit (compatible with Windows 7 or later versions
of the Windows operating system), or you may start the Agility mobile app
(Android only).
Connect Input
Connect Output/Pwr
Connect PC/USB
Configure
Optional
Calibrate I/O