Acromag DT333-0700 User manual

USB Programmable, DIN Rail Mount, DC-Powered
Dual/Single Transmitter or Signal Splitter w/ Millivolt/
Thermocouple Inputs & Current or Voltage Outputs
Model DT333-0700, Dual Input Transmitter for
Thermocouple and ±100mV/±1V Input
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road
Wixom, MI 48393-2417 U.S.A. email: [email protected]
Copyright 2018, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8501130C

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 2 -
http://www.acromag.com
- 2 -
https://www.acromag.com
Table of Contents
GETTING STARTED ............................................................................................4
DESCRIPTION.......................................................................................................4
Key Features........................................................................................................................4
Application..........................................................................................................................4
Mechanical Dimensions .......................................................................................................5
DIN Rail Mounting & Removal..............................................................................................5
ELECTRICAL CONNECTIONS............................................................................6
SENSOR INPUT CONNECTIONS .......................................................................7
Output Connections.............................................................................................................8
Power Connections..............................................................................................................9
Optional Bus Power Connections .......................................................................................10
Earth Ground Connections .................................................................................................11
USB Connections................................................................................................................12
CONFIGURATION SOFTWARE...................................................................... 13
Quick Overview –Android .................................................................................................13
Quick Overview –Windows ...............................................................................................14
OPERATION STEP-BY-STEP.......................................................................... 17
Connections.......................................................................................................................17
Thermocouple Millivoltage Versus Temperature Reference Table ......................................18
Configuration.....................................................................................................................19
Calibration (Optional) ........................................................................................................22
Diagnostics ........................................................................................................................24
BLOCK DIAGRAM ............................................................................................. 25
How It Works.....................................................................................................................25
TROUBLESHOOTING....................................................................................... 26
Diagnostics Table...............................................................................................................26
Service & Repair Assistance ...............................................................................................27
ACCESSORIES .................................................................................................... 28
Software Interface Package................................................................................................28
USB Isolator.......................................................................................................................28
USB A-B Cable....................................................................................................................28
USB A-mini B Cable............................................................................................................28
USB OTG Cable ..................................................................................................................29
DIN Rail Bus Connector Kit .................................................................................................29
End Stops...........................................................................................................................29
SPECIFICATIONS .............................................................................................. 30
Model Number ..................................................................................................................30
Input (Each).......................................................................................................................30

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 3 -
http://www.acromag.com
- 3 -
https://www.acromag.com
Output (Each) ....................................................................................................................33
USB Interface.....................................................................................................................34
Power................................................................................................................................34
Enclosure & Physical..........................................................................................................35
Environmental...................................................................................................................35
Agency Approvals ..............................................................................................................36
Reliability Prediction..........................................................................................................36
Configuration Controls.......................................................................................................36
REVISION HISTORY......................................................................................... 37
All trademarks are the property of their respective owners.
IMPORTANT SAFETY CONSIDERATIONS
You must consider the possible negative effects of power, wiring, component, sensor, or software failure in the design of
any type of control or monitoring system. This is very important where property loss or human life is involved. It is
important that you perform satisfactory overall system design and it is agreed between you and Acromag, that this is your
responsibility.
The information of this manual may change without notice. Acromag makes no warranty of any kind regarding this
material, including, but not limited to, the implied warranties of merchantability and fitness for its intended purpose.
Further, Acromag assumes no responsibility for any errors that may appear in this manual and makes no commitment
to update, or keep current, the information contained in this manual. No part of this manual may be copied or
reproduced in any form without the prior written consent of Acromag, Inc.
This manual is for dual DT333 4-wire transmitters (4-wire refers to having separate isolated power) that
convert two channels of thermocouple or low DC voltage signals to isolated voltage or current output signals.
However, if your application requires dual 2-wire (loop-powered) transmitter instead, please refer to the
similar DT233 model. For DC voltage and current input signals, please refer to other DT33x (4-wire) and DT23x
(2-wire loop-powered) models.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 4 -
http://www.acromag.com
- 4 -
https://www.acromag.com
GETTING STARTED
DESCRIPTION
Symbols on equipment:
Means “Refer to User’s Manual
(this manual) for additional
information”.
Each I/O channel of the DT333-0700 is modeled after an ANSI/ISA Type IV
transmitter. Isolated input channels interface with thermocouple sensors (type J, K,
T, R, S, B, E or N) or ±100mV/±1V signal sources and modulate isolated DC outputs
that may drive current or voltage. This dual channel device is unique in that it may
operate as a dual transmitter, a single transmitter, or a CH1 signal splitter. Units are
set up, calibrated, and rescaled using configuration software and a USB connection
to Windows-based PC’s (Windows 7 and later versions only), or using a USB-OTG
cable to Android smartphones or tablets using the Agility mobile app. Units provide
adjustable input and output ranges, output signals for voltage or current, three-way
and channel-to-channel isolation, lead-break detection, cold-junction
compensation, and variable input filtering.
Key Features
•Digitally configured and calibrated w/ Windows software via USB, or a wired
USB-OTG connection to Android smartphones or tablets.
•Dual Channels in a thin 17.5mm wide enclosure for high-density mounting.
•Operates as a dual transmitter, a single transmitter, or a CH1 signal splitter.
•High measurement accuracy and linearity with 16-bit I/O conversion.
•Adjustable/scalable inputs and outputs.
•TC Type J, K, T, R, S, B, E, N, ±100mV, or ±1V input signal support.
•TC inputs are linearized with respect to temperature and include Cold-
Junction Compensation which may be turned on/off.
•Supports both Celsius and Fahrenheit temperature units.
•Variable digital input filter adjustment.
•Separate short-circuit protected voltage and current output terminals at each
output supports ±10V, ±5V, 0-10V, 0-5V, or 0-20mA, 4-20mA output.
•Output channels can transmit Normal or Reverse Acting output signals.
•Up-scale or down-scale lead-break/burnout detection.
•Reverse-polarity protected 6-32VDC power is bus/redundant power ready.
•Wide ambient temperature operation from -40°C to +70°C.
•Thoroughly tested and hardened for harsh environments.
•CE Approved.
•FCC Conformity Class B
•cULus Listed - Class I/Division 2 - Haz. Loc., ATEX, & IECEx.
Application
For additional information on
these devices and related topics,
please visit our web site at
www.acromag.com.
These dual transmitters are designed for high-density mounting on T-type DIN rails
and may be mounted side-by-side on 0.7-inch (17.5mm) centers and support 6-32V
DC power via terminals on the unit, or optionally via power wired to a DIN-rail bus
connector. Each channel isolates a thermocouple or low voltage input signal and
can mate with grounded or non-grounded sensors. They drive isolated outputs that
source current or voltage with support for 0-20mA, 4-20mA, or ±10V, ±5V, 0-10V,
and 0-5V output ranges.
!

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 5 -
http://www.acromag.com
- 5 -
https://www.acromag.com
Mechanical Dimensions
Units may be mounted to 35mm
“T” type DIN rail (35mm, type
EN50022), and side-by-side on 0.7-
inch centers.
WARNING: IEC Safety Standards
may require that this device be
mounted within an approved
metal enclosure or sub-system,
particularly for applications with
exposure to voltages greater than
or equal to 75VDC or 50VAC.
DIN Rail Mounting & Removal
NOTE: It is recommended that this
unit be mounted upright on a DIN
rail allowing free air flow intake
from the bottom vent to flow
through the unit and out the top
vent. This will allow the unit to
run cooler, perform better and
help to extend the life of the
electronics.
Refer to the following figure for attaching and removing a unit from the DIN rail. A
spring-loaded DIN clip is located on the input side bottom. The opposite rounded
edge at the bottom of the output side allows you to tilt the unit upward to lift it
from the rail while prying the spring clip back with a screwdriver. To attach the
module to T-type DIN rail, angle the top of the unit towards the rail and place the
top groove of the module over the upper lip of the DIN rail. Firmly push the unit
downward towards the rail until it snaps into place. To remove it from the DIN rail,
first separate the input terminal blocks from the bottom side of the module to
create a clearance to the DIN mounting area. You can use a screwdriver to pry the
pluggable terminals out of their sockets. Next, while holding the module in place
from above, insert a screwdriver into the lower path of the bottom of the module to
the DIN rail clip and use it as a lever to force the DIN rail spring clip down while
pulling the bottom of the module outward until it disengages from the rail. Then
simply lift it from the rail.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 6 -
http://www.acromag.com
- 6 -
https://www.acromag.com
ELECTRICAL CONNECTIONS
WARNING –EXPLOSION HAZARD –Do not disconnect equipment unless power has
been removed or the area is known to be non-hazardous.
WARNING –EXPLOSION HAZARD –Substitution of any components may impair
suitability for Class I, Division 2.
WARNING –EXPLOSION HAZARD –The area must be known to be non-hazardous
before servicing/replacing the unit and before installing.
Wire terminals can accommodate 14–28 AWG (2.08–0.081mm2) solid or stranded
wire with a minimum temperature rating of 90oC. Input wiring may be shielded or
unshielded type. Ideally, output wires should be twisted pair, or shielded twisted
pair. Terminals are pluggable and can be removed from their sockets by prying
outward from the top with a flat-head screwdriver blade. This model allows
thermocouples or low voltage inputs to be wired to TB1 and drivers separate
outputs. Strip back wire insulation 0.25-inch on each lead and insert the wire ends
into the cage clamp connector of the terminal block. Use a screwdriver to tighten
the screw by turning it in a clockwise direction to secure the wire (0.5-0.6Nm
torque). Use adequate wire insulation and follow proper wiring practice, as
common mode voltages can exist on signal wiring. As a rule, output wires are
normally separated from input wiring for safety, as well as for low noise pickup.
!

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 7 -
http://www.acromag.com
- 7 -
https://www.acromag.com
Sensor Input Connections
Sensor wires are wired directly to transmitter input terminal TB1 (channel 1) or TB3
(channel 2) at the bottom of the module (the spring-loaded DIN clip side), as shown
in the connection drawing below. Observe proper polarity when making input
connections.
•Transmitter input signals are separately isolated from the outputs, each
other, and power.
•TC inputs use ± polarized terminals at TB1 and TB3, observe proper polarity.
The positive input is on the left and labeled “+”, and the negative input is to its
right. See connection figure below per input model. Each output channel may
drive current or voltage from separate channel terminals that share a return.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 8 -
http://www.acromag.com
- 8 -
https://www.acromag.com
Output Connections
(To DC Current or DC Voltage
Terminals)
Outputs are short-circuit protected
from damage.
This transmitter is modeled after ANSI/ISA Type 4 transmitters in which unit power,
is separate from the input and output, except this unit includes two channels.
•Output connections are polarized. Tandem current and voltage output
terminals at each isolated output channel share an output return (RTN).
Current output is sourced from I Out+ and returned to RTN. Voltage
output is sourced positive at V Out+ with respect to RTN. Only one channel
output terminal (voltage or current) may be loaded at a time.
•Variations in load resistance has negligible effect on output accuracy
when load limits are respected with respect to output type (see below).
Observe proper polarity. Note that twisted-pair wiring is often used to connect the
longest distance between each field transmitter output and the remote load as
shown above. Additionally, shielded twisted pair wiring is recommended for best
results. An output connection to earth ground at each output return will help
protect the circuit from damage in noisy environments.
WARNING: For compliance to applicable safety and performance standards,
the use of twisted pair output wiring is recommended. Failure to adhere to
sound wiring and grounding practices as instructed may compromise safety,
performance, and possibly damage the unit.
TIP - Ripple & Noise: Place additional capacitance at the load to help reduce the
60Hz/120Hz ripple sometimes present in industrial applications. For large 60Hz
ripple, connect an external 1uF or larger capacitor directly across the load to reduce
excess ripple. For sensitive applications with high-speed acquisition at the load,
high frequency noise may be reduced significantly by placing a 0.1uF capacitor
directly across the load, and as close to the load as possible.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 9 -
http://www.acromag.com
- 9 -
https://www.acromag.com
Power Connections
The power terminals are reverse
polarity protected.
IMPORTANT –External Fuse: If
this unit is powered from a supply
capable of delivering more than 3A
to the unit, it is recommended that
potential fault current be limited
via a high surge tolerant fuse rated
for a maximum current less than
3A (for example, see Bel Fuse MJS
or RJS fuse types).
The unit is powered from 6-32V DC (36V DC peak) by connecting power as shown
below. This transmitter can be optionally powered (or redundantly powered) via
the DIN rail bus when coupled to an optional DIN rail bus connector (Acromag
Model 1005-063) with a bus terminal block (Acromag 1005-220 or 1005-221). This
optional power connection method can allow several modules to share a single
power supply without wiring power to each power terminal block individually.
•Power connections are isolated from the inputs and outputs. The supply
voltage should be from 6-32V DC. This voltage must never exceed 36V DC
peak, or damage to the unit may result.
•Variations in power supply voltage between the minimum required and
32V maximum, has negligible effect on transmitter accuracy.
•Note the placement of earth ground at power. The power cable shield and
DC- should ideally be grounded closest to the module. The input and
output circuit commons are capacitively coupled to earth ground at DC-
through high-voltage isolation capacitors, offering some protection if their
circuits happen to float relative to power (not recommended).
Power Connections…
CAUTION: Risk of Electric Shock –More than one disconnect switch may be
required to de-energize this equipment before servicing.
IMPORTANT –External Fuse: If a unit is powered from a supply capable of
delivering more than 3A to the unit, it is recommended that this current magnitude
be limited via a high surge tolerant fuse rated for less than 3A (for example, see Bel
Fuse MJS or RJS fuse types).

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 10 -
http://www.acromag.com
- 10 -
https://www.acromag.com
Optional Bus Power Connections
TIP: How many units may share a
bussed connection to power? This
device consumes up to 1.6W. For
a bussed power connection, it is
recommended that you fuse-limit
the maximum supply current to 3A
or less including inrush. The turn-
ON inrush current may peak up to
twice its DC value. To calculate
the safe maximum number of units
that can share this supply
connection, multiply 1.5A and your
supply voltage and divide the
result by 1.6W. For this model,
this is roughly equivalent to the
number of supply volts. That is, a
24V supply fused with 3A may
drive 24 units safely.
Power is normally wired to the TB5 terminals of the unit as shown on the previous
page. However, this device is equipped to be optionally or redundantly powered via
a DIN rail bus connector (Acromag 1005-063) mated to an optional plug-in terminal
block (Acromag 1005-220 or 1005-221, depending on left or right-side wire entry).
Any power input via the bus connector is diode-coupled to the same point in the
circuit as unit power connected at power terminal TB5. You could power multiple
units by snapping them together along the DIN rail bus using connector 1005-063,
then connecting a mating terminal block (select a Left or Right-side connector, see
figure below). While the intent of the bus power connector is to allow several units
to conveniently share a single supply, you could also use the bus power connector
to redundantly power units (with local power also applied at TB5), allowing a
backup supply to maintain power to the units should the main supply at TB5 fail.
Acromag TTBUS-KIT connector kit contains bus connector 1005-063, plus left-side
terminal 1005-220, and right-side terminal 1005-221, allowing units to snap
together, side-by-side, along the DIN rail and share the power connection.
Important –End Stops: If this module uses the optionally powered (or redundantly
powered) via the DIN rail bus for hazardous location installations (Class I, Division 2
or ATEX/IECEx Zone 2) it should use two end stops (like Acromag 1027-222) to
secure the terminal block and module (not shown).
Optional Bus Power
Connections…
The figure below shows how to wire power to the optional bus terminal block when
mated to the bus connector. Note that power is wired to the rightmost bus
terminals on the right, or the left-most terminals on the left. Observe proper
polarity.
!

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 11 -
http://www.acromag.com
- 11 -
https://www.acromag.com
Earth Ground Connections
The unit housing is plastic and does not require an earth ground connection. Internally, the inputs, each output, and
power circuits are electrically isolated from each other, allowing these circuits to be individually earth grounded as
indicated. Additionally, if the transmitter is mounted in a metal housing, a ground wire connection is typically required
for the enclosure and you should connect that metal enclosure’s ground terminal (green screw) to earth ground using
suitable wire per applicable codes. See the Electrical Connections Drawings for Inputs, Outputs, and Power, and note the
position of earth ground for each isolated circuit. Earth ground provides a safe destination for potentially destructive
transient energy in each isolated circuit, helping to prevent damage to circuitry, as circuit capacitors and transient voltage
suppressors steer towards the negative terminals of their circuits, where earth ground is normally applied.
•Avoid inadvertent connections to earth ground at other points than those indicated, as this could drive ground
loops and negatively affect operation.
•A USB isolator is recommended when configuring or calibrating a unit to avoid the ground loop that occurs if
your input is also earth grounded (A PC commonly earth grounds its USB port contacting both the USB signal and
shield ground which are held in common to the input circuit ground of this transmitter).

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 12 -
http://www.acromag.com
- 12 -
https://www.acromag.com
USB Connections
This transmitter is configured and calibrated via configuration software that runs on
a Windows-based PC connected to the unit via USB (Windows 7 or later required),
or via a USB-OTG connection to an Android smartphone or tablet using the Acromag
Agility mobile app. Refer to the following drawing to connect your PC or laptop to
the transmitter to reconfigure or calibrate it using this software.
WARNING: The intent of mating
this transmitter to USB is so that it
can be conveniently set up and
calibrated in a safe area, then
installed in the field which may be
in a hazardous area. Do not
attempt to connect a PC or laptop
to this unit while installed in a
hazardous area, as USB energy
levels could ignite explosive gases
or particles in the air.
•USB Signal Isolation is recommended and required when connected to a
grounded input –Input 1 and USB connections are isolated from each output
and power of this model. USB Isolation is recommended for safety and noise
suppression. It is required when the input signal happens to be grounded. 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).
IMPORTANT: USB logic signals to the transmitter are referenced to the potential of
the transmitter’s input 1 circuit ground. This ground is held in common with USB
ground and USB cable shield ground. Thus, an isolator is required when the input 1
signal has been tied to earth-ground and the unit is connected to the USB port of a
PC that is also tied to earth-ground. You could avoid the use of an isolator if a
battery powered laptop was instead used to connect to the transmitter and the
laptop had no other earth ground connection, either directly or indirectly via a
connected peripheral.
!
Note: Output/Power to Transmitter must
be applied before USB connection
(See Output/Power Connections).

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 13 -
http://www.acromag.com
- 13 -
https://www.acromag.com
CONFIGURATION SOFTWARE
Quick Overview –Android
This dual transmitter can be setup & calibrated via the Acromag
Agility™ Config Tool. The Agility™ software APP can be
downloaded free of charge from play.google.com. To connect to
this transmitter, a USB OTG (On-The-Go) cable (5028-565) and USB
A to Mini-B cable (4001-113) are required. This app is compatible
with Android devices using Ice Cream Sandwich (4.0) or later.
The initial connection screen of the app is shown at left. Once a device is
connected, the main portion of the app will launch. The screen is divided into three
tabs for this model. A short description of each tab follows.
Connection Screen Set up –DEVICE SELECT (First Connect to Unit Here)
•Select from connected transmitters by tapping the [Select Device] button. This
will bring up a list of attached devices. Select the desired device and tap the
Connect button to open the device.
•To view wiring diagrams of a transmitter, tap the [Wiring Diagram] button and
select the desired model. Swipe left or right to view more diagrams. No
connection is required to view the diagrams.
•Android requires user permission to access external hardware. If the Device
List displays “No Device Permission”, select this device and when prompted to
give permission to access the USB device, tap [OK].
Configuration Tab –CONFIGURE I/O
•Once connected, the app will automatically read your transmitter and display
its current configuration.
•Changing any option on this page will send the changes to the transmitter
instantly. The device status at the bottom of the page will report if the changes
were sent successfully.
Calibration Tab –(Calibrate the Inputs and/or Outputs if Needed)
•On screen instruction guides the set up to properly calibrate the transmitter.
After completing instructions, tap the [Calibrate] button.
•The device status at the bottom of the page will report if the calibration was
sent successfully.
Diagnostic Center Tab –(Verify Input operation)
•Select the polling indicator by tapping the [Indicator] button.
•Start polling by tapping the [Start Polling] button.
Utility Page –(Reboot or Restore Settings)
•Tap the [Gear] in the Action bar to access the Utility Page.
•You can tap the [Restore/Reset Factory] utility buttons to get out of trouble if
you ever misconfigure or improperly calibrate a transmitter.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 14 -
http://www.acromag.com
- 14 -
https://www.acromag.com
Quick Overview –Windows
Click “Open” to connect to the DT333-0700 and your
screen will like:
HELP –press F1 for Help on a selected or highlighted field or
button. You can also click [?] in the upper-right hand corner of
the screen and click again to point to a field or button to get a
Help message pertaining to the item you pointed to.
For detailed configuration and calibration procedures, see the
Operation Step-By-Step section of the Technical Reference on
page 18 of this manual.
This transmitter can be
reconfigured and calibrated via
its USB Configuration Software
and a USB connection to your
Windows PC or laptop. The
software can be downloaded
free of charge from https://www.acromag.com, and
is included on a CDROM bundled with the
Configuration Kit TTC-SIP (see Accessories section).
For this model, look for program DT333Config.exe.
This software is compatible with v7 or later versions of
the Windows operating system.
The initial USB configuration software screen for this
model is shown at left. Unit configuration information
is divided across four separately tabbed pages as
follows: Communication Set up, Configuration,
Calibration, and Diagnostics. A short description of
each of these configuration pages follows:
Communication Set up (First Connect to Unit Here)
•Select from connected transmitters and
Open/Close communication with them.
•Display the Model, Serial Number, and
Manufacturer of the connected transmitter and
report the status of communication with it.
Configuration (Configure and/or Test the Unit Here)
•Click [Get I/O Config] to retrieve the I/O
configuration of the current connected unit.
•Select the operating Mode: Dual transmitter,
Single transmitter, or Signal Splitter.
•Set Input type/range: J,K,T,R,S,E,B,N, or ±100mV.
•Set the level of digital filtering to High, Medium,
Low, or None (No digital filter). I/O response
times vary with filter and are indicated next to
your selection (see Specifications for details).
•Set the Break Detection Upscale or Downscale.
•Turn CJC on/off for the channel.
•Set the current or voltage Output Range to ±10V,
±5V, 0-5V, 0-10V, ±20mA, 0-20mA, or 4-20mA.
•View the unit’s configuration message status in
the Status field.
•Use the I/O Scaling fields to specify the input
range endpoints to correspond to the nominal
output range zero and full-scale endpoints (some
over/under-range is included).
•After making changes, send your settings to the
unit by clicking [Send I/O Config] and follow the
on-screen prompts.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 15 -
http://www.acromag.com
- 15 -
https://www.acromag.com
Quick Overview –Windows...
Calibration (Input, Output, or Temp Ref if Needed)
•Calibrate an input channel, output channel, or
temperature reference as needed.
This unit has already been factory calibrated. If you
encounter excessive error, you can choose to click the
Calibration tab to display the Calibration control page
shown in the second screen at left.
To calibrate the Input channel, Output channel, or
Temperature Reference of this model, simply select the
channel click the respective “Cal Instructions” button and
follow the on-screen prompts.
Note that only nominal I/O ranges are used for
calibration, not scaled sub-ranges ranges.
Diagnostics (Optional, to Verify Unit Operation)
•Use this screen to verify communication with the
unit or problems with your input wiring.
•Click [Start Polling] to periodically read your input
channels and validate operation. Click [Stop Polling]
to stop polling the input channels. The simulated
red lamp to the left of the button flashes slowly
when the software polls the input channels. Stop
polling before selecting another page or sending a
new reconfiguration.
After making Configuration changes, you may use the
Diagnostics - TEST I/O controls to start/stop polling the
input channel(s) to check your input readings (see 3rd
screen at left).
The communication status of the polling messages is also
indicated and can be helpful to troubleshoot connection
problems.
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
then click again to point to a field or control to get a Help
message pertaining to the item you pointed to.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 16 -
http://www.acromag.com
- 16 -
https://www.acromag.com
Quick Overview –Windows...
Calibration Input…
Set the Input Range of the channel to calibrate in the I/O
Config/Test page and be sure to click the [Send I/O
Config] button before attempting calibration. In the
Calibration page at left, select the channel and click
[Input Cal Instructions] to begin input calibration.
When you click [Zero] or [Full Scale] of the Calibration
Input section, you will be prompted to apply a specific
voltage signal at TB1/TB3 corresponding to your selected
channel/input range. Once you apply this signal, click
[OK] of the prompt and follow the on-screen
instructions to complete input calibration.
Calibration Output…
Click the [Output Cal Instructions] button to begin
output calibration. You will be prompted to adjust the
input signal to drive the output to its precise output
range zero or full-scale level. Once the output is set to
zero or full-scale, you simply click the corresponding
[Zero] or [Full-Scale] button of Calibration - Output to
set the output range zero or full-scale endpoint.
Calibration Temperature Reference...
This model embeds two very accurate temperature
sensors in the plastic around the input ± terminals at TB1
and TB3 to cold-junction compensate thermocouple
signal wires. To explain, the voltage measured from a
T/C reflects the difference in temperature between each
end. To discern the temperature being sensed, it is
necessary to know the temperature at the other end,
usually referred to as the Cold Junction.
This section calibrates the cold-junction temperature
reference used for cold junction compensation of T/C
input types. Click the [Instructions] button to begin
reference calibration and you will be prompted to
connect a TC Type J ice point reference to the input (see
screen at left). Note that you must already have the
Type J TC range calibrated to accomplish CJC calibration.
Factory Settings (in Case of Trouble or for Sanitation)
•Restore unit to its original factory calibration.
•Restore unit to its initial factory configuration.
You can click the “Restore Factory”buttons if you ever
misconfigure or improperly calibrate a transmitter such
that its operation appears erratic, or for sanitation
purposes when decommissioning a module.
Calibration Status (Bottom of Calibration Screen)...
•Displays communication status messages relative to
the calibration process.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 17 -
http://www.acromag.com
- 17 -
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:Your input sources, output meters, and load resistors (current outputs) must
be accurate beyond the unit specifications, or better than ±0.1%. A good rule of
thumb is that your equipment accuracy should be four times better than the rated
accuracy you are trying to achieve with this transmitter.
Calibration Connections:
1. Connect Transmitter Input(s): Connect a precision signal source to inputs at
TB1/TB3 terminals, as required for your input channel range. Your signal
source must be adjustable to the nominal input range zero and full-scale levels.
Observe proper polarity. It is recommended that your signal source output
impedance be no more than 100.
2. Connect to One Output, Voltage or Current of Each Output Channel: Wire
output loads to the unit appropriate for either current or voltage, as required
by your application. You will need to measure output current or voltage
accurately to calibrate the output. You could connect a current meter in series
with the load to read the output current directly, or a digital volt meter in
parallel with the load to measure output voltage. Alternatively, you could
simply connect a voltmeter across a precision load resistor to accurately read
an output current as a function of the IR voltage drop produced in the load
resistor (recommended for current output).
3. Connect Power: Wire 6-32VDC power to the unit at TB5 as shown in the
Electrical Connections section. Optionally, you may wire power to the bus
terminal as shown in the optional power connections drawing. But in either
case, never exceed 36VDC peak, or damage to the unit may result.
Apply power to the transmitter before connecting to USB. You will not be able
to configure or calibrate the unit without separate power also applied, as this
device does not draw power from its USB connection.
4. Connect to PC via USB: Connect the transmitter to the PC using the USB
isolator and cables provided in Configuration Kit TTC-SIP (refer to Electrical
Connections section). You may omit the isolator only if you are using a battery
powered laptop to connect to the unit, or if your input source is not already
grounded.
Now that you have made your connections and applied power, you can
execute the DT333Config.exe software to begin configuration of the unit
(software is compatible with v7 or later versions of the Windows operating
system).
Connect Input
Connect Output
Connect Power
Connect
PC/USB
Configure I/O

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 18 -
http://www.acromag.com
- 18 -
https://www.acromag.com
Thermocouple Millivoltage Versus Temperature Reference Table
Thermocouple milliVoltage Versus Temperature (Per National Institute of Standards and Technology (NIST/ITS-90) Thermocouple Tables)1
TEMP
Thermoelectric Voltage In milliVolts (With Reference Junction at 0C)
C
J
K
T
E
R
S
B
N
-260
---
-6.232
---
---
---
---
-250
---
---
-6.180
---
---
---
---
---
-230
---
---
-6.007
---
---
---
---
-4.226
-210
-8.095
---
-5.753
---
---
---
---
-4.083
-200
-7.890
-5.891
-5.603
-8.825
---
---
---
-3.990
-150
-6.500
-4.913
-4.648
-7.279
---
---
---
-3.336
-100
-4.633
-3.554
-3.379
-5.237
---
---
---
-2.407
-50
-2.431
-1.889
-1.819
-2.787
-0.226
-0.236
---
-1.269
0
0.000
0.000
0.000
0.000
0.000
0.000
---
0.000
+ 50
2.585
2.023
2.036
3.048
0.296
0.299
---
1.340
+ 100
5.269
4.096
4.279
6.319
0.647
0.646
---
2.774
+ 150
8.010
6.138
6.704
9.789
1.041
1.029
---
4.302
+ 200
10.779
8.138
9.288
13.421
1.469
1.441
---
5.913
+ 250
13.555
10.153
12.013
17.181
1.923
1.874
---
7.597
+ 260
14.110
10.561
12.574
17.945
2.017
1.962
0.317
7.941
+ 300
16.327
12.209
14.862
21.036
2.401
2.323
0.431
9.341
+ 350
19.090
14.293
17.819
24.964
2.896
2.786
0.596
11.136
+ 390
21.297
15.975
20.255
28.146
3.304
3.164
0.746
12.603
+ 400
21.848
16.397
20.872
28.946
3.408
3.259
0.787
12.974
+ 450
24.610
18.516
---
32.965
3.933
3.742
1.002
14.848
+ 500
27.393
20.644
---
37.005
4.471
4.233
1.242
16.748
+ 550
30.216
22.776
---
41.053
5.021
4.732
1.505
18.672
+ 600
33.102
24.905
---
45.093
5.583
5.239
1.792
20.613
+ 650
36.071
27.025
---
49.116
6.157
5.753
2.101
22.556
+ 700
39.132
29.129
---
53.112
6.743
6.275
2.431
24.527
+ 760
42.919
31.628
---
57.870
7.461
6.913
2.854
26.883
+ 800
---
33.275
---
61.017
7.950
7.345
3.154
28.455
+ 900
---
37.326
---
68.787
9.205
8.449
3.957
32.371
+ 950
---
39.314
---
72.603
9.850
9.014
4.387
34.319
+1000
---
41.276
---
76.373
10.506
9.587
4.834
36.256
+1200
---
48.828
---
---
13.228
11.951
6.786
43.846
+1300
---
52.410
---
---
14.629
13.159
7.848
47.513
+1372
---
54.886
---
---
15.645
14.033
8.642
---
+1400
---
---
---
---
16.040
14.373
8.956
---
+1600
---
---
---
---
18.849
16.777
11.263
---
+1700
---
---
---
---
20.222
17.947
12.433
---
+1750
---
---
---
---
20.877
18.503
13.014
---
+1768
---
---
---
---
21.101
18.693
13.223
---
+1800
---
---
---
---
---
---
13.591
---
+1820
---
---
---
---
---
---
13.820
---
1Note: Shaded cells refer to the calibration range end points used to calibrate the full range of the T/C type for this
model. Bold column entries refer to the nominal T/C input range end points of this model.
2Note: CJC temperature values are resolved to 0.05°C increments using internal lookup tables corresponding to the T/C
type. This means that if an input is scaled to a small input span, its reading may appear less accurate with CJC ON, as
±0.05°C becomes a greater percentage of a smaller span.
The voltage measured from a T/C reflects the difference in temperature between each end. To discern the actual
temperature being sensed at the remote end (in the table above), the unit must subtract the equivalent thermoelectric
voltage of the other end from its measurement (usually referred to as its Cold Junction reading). This unit senses the
temperature of its TB1 and TB3 terminals to cold-junction compensate its T/C reading at channel 1 or channel 2 and
remove the portion of the measured voltage that corresponds to its cold junction.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 19 -
http://www.acromag.com
- 19 -
https://www.acromag.com
Configuration
Note that you should already have power connected to the
transmitter at this point. This model does not utilize USB power and
you will not be able to configure, calibrate, or test the unit without
separate power applied.
After executing the Acromag Configuration software for this model,
the first screen shown at left will appear, if you have not already
connected to your transmitter via USB (note fields are blank under
these conditions).
Connect your PC to the unit via USB, and the unit’s model-serial
information will appear in the Device field as shown in the third
screen at left.
If you happen to be connected to more than one unit via a USB hub,
you can use the Device scroll field to select another unit, using its
serial number suffix of the Device Model number to help discern one
unit from another.
Once you have selected a device, click the [Open] button to open
communication with the unit.
After clicking [Open], the selected unit’s Model, Serial Number,
Manufacturer, and connection status message will be displayed as
shown in the third screen at left.
TIP: Always Close a connection with one device before selecting
another device and make sure you have the correct model software
loaded for the model you are configuring.
After you connect USB and “Open” communications with a unit, the
Status field indicates “Device opened successfully” as shown in the
screen at left.
At this point, you can click the “Configuration”tab to begin
configuring the unit.

Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: [phone] - 20 -
http://www.acromag.com
- 20 -
https://www.acromag.com
Configuration…
The Configuration screen is the first screen at left. When you clicked
the “Configuration” tab, the software retrieved the unit’s current
configuration and displayed it as shown at left.
IMPORTANT: DT models have three modes of operation: Dual
Transmitter, Single CH1 Transmitter, and CH1 Signal Splitter. Your
Configuration screen will vary slightly with the Operating Mode
selection. The second screen at left is for CH1 Single Transmitter
mode, the third screen for CH1 Signal Splitter mode. For single CH2
transmitter operation, select dual transmitter mode and ignore CH1.
When connected to a module, the initial Configuration screen
represents the current configuration and operating mode of the
connected module before making changes. Otherwise, if you have
loaded the configuration from a saved file, or have made changes to
any fields, you can choose to click [Get I/O Config] to retrieve the
connected module’s current configuration.
Note that if you make any changes to the configuration indicated,
the only way to preserve your changes is to write them to the device
by clicking [Send I/O Config] after completing your changes, or by
saving them to a file by clicking “File” in the upper left-hand corner
of the screen.
Select the Input Type/Range for the Channel…
Input Type refers to the nominal input range wired to TB1 (channel
1) or TB3 (channel 2) and you may select TC types J, K, T, R, S, E, B,
N, or ±100mV. Note that nominal input ranges may be rescaled.
Any nominal input type/range you pick here can be rescaled to the
output, allowing you to use only a portion or sub-range of the
selected type to drive its current or voltage output, as desired. Keep
in mind that your resolution will decrease proportionally as you
rescale the input signal to smaller sub-ranges. Each halving of the
nominal range will reduce resolution by 1 bit. This can also magnify
error, especially noticeable for very small input ranges (less than 12
bits) which degrade the signal-to-noise ratio of the input and
resolution of the analog-to-digital conversion.
Select the Input Filtering…
You may select the level of digital filtering to apply to the input
channel as Low, Medium, High, or None (No digital filtering). I/O
response time varies with input filter selection and typical times are
indicated in parenthesis next to filter selection. Higher filter levels
result in lower average noise, but with a slower I/O response time
(see Specifications for detail).