Model DT233-0600
Dual Two-Wire mV/TC Input Transmitters
Acromag, Inc. Tel: 248-295-0880
- 25 -
http://www.acromag.com
- 25 -
https://www.acromag.com
Configuration
…
HELP
–
You can press
[F1]
for Help on a selected
or highlighted field or control. You can also click
the
[?]
button in the upper-right hand corner of
the screen and click to point to a field or control
to get a Help message pertaining to the item
you pointed to.
At this point, you could choose to test the
module’s operation by clicking the “Diagnostics”
tab which allows you to periodically read the
input channels and display their values, or you
could click the “Calibrate” tab to calibrate this
unit’s inputs, outp
uts, or temperature
references.
Select the Break Direction for the Channel
…
If a T/C lead-wire connected to the channel breaks or its connection
opens, you can select the direction to send the output signal: upscale
or downscale to signal the fault.
Turn CJC (Cold Junction Compensation) On or Off at the Channel
…
There are two very accurate temperature sensors mounted inside in
the plastic of the terminal sockets of the input terminals at TB1 and
TB3 which are used to cold-junction compensate connected
thermocouple signal wires. Because the voltage measured across the
T/C is relative to the difference in temperature between each end, CJC
is used to extract the temperature of the remote end by monitoring
the temperature at the input terminals, usually referred to as the Cold
Junction of the T/C.
Select the I/O Scaling for the Channel
…
You may rescale the nominal input or output range to a smaller sub-
range. For inputs and outputs, be careful not to reduce an I/O range
too much, as resolution diminishes in proportion and noise/error
magnifies (each halving of range reduces respective resolution by 1
bit). A good rule of thumb to achieve rated performance is to maintain
an effective I/O resolution of 12 bits or better when scaling I/O ranges.
In the Input/Output scaling fields for each endpoint, set the input
signal minimum/zero value and maximum/full-scale value inside the
nominal range to correspond to the output range zero/full-scale value
inside the nominal output range. You could optionally swap input
zero/full-scale levels to configure a reverse acting output response if
desired. Note that some under and over-range is built into every I/O
range and these limits vary.
If the input zero and full-scale points are chosen too close together,
performance will be degraded.
Select the Output Limits...
Two-Wire transmitter channels drive current. You can set your own
Minimum and Maximum linear operating range limits, or you may
select Namur limits of 3.7mA and 21.7mA. By setting range limits
inside the a possible range from 3.5mA to 24mA, you can discern a
valid high or low input signal from a range fault (broken lead or open
sensor).
Set Input Units for Display & the Output Will be Linearized to
…
This model supports T/C inputs in your choice of degrees Celsius or
Fahrenheit (millivolt inputs use millivolts).
Once you have made your configuration selections, click the
[Send I/O
Config]
button to write them to the module. You can read the Status
of your sent message to the unit in the “Status” field.
Alternately, you
could click
“
F
ile”
in the upper left corner to save the settings to a file
on your PC, for later reference.
