Acromag TT235-0600 User manual

USB Programmable, DIN Rail Mount
Thin Transmitter
Model TT235-0600, Two-Wire Transmitter
RTD/Resistance Input
4-20mA Output
USER’S MANUAL
ACROMAG INCORPORATED
30765 South Wixom Road
Wixom, MI 48393-2417 U.S.A.
Copyright 2018, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice.
Tel: [phone]
Fax: [phone]
email: [email protected]
8500995M

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 2 -
http://www.acromag.com
[2 ]
https://www.acromag.com
Table of Contents
GETTING STARTEDDESCRIPTION ...............................................................4
Key Features........................................................................................................................4
Application..........................................................................................................................4
Mechanical Dimensions .......................................................................................................5
DIN Rail Mounting & Removal..............................................................................................5
ELECTRICAL CONNECTIONS.......................................................................6
Sensor Input Connections ....................................................................................................7
Output/Power Connections ...............................................................................................10
Earth Ground Connections .................................................................................................12
USB Connections................................................................................................................13
CONFIGURATION SOFTWARE..................................................................14
Quick Overview –Android .................................................................................................14
Quick Overview –Windows ...............................................................................................15
OPERATION STEP-BY-STEP......................................................................17
Connections.......................................................................................................................17
Configuration.....................................................................................................................19
Calibration (Optional) ........................................................................................................21
RTD Resistance versus Temperature ..................................................................................23
BLOCK DIAGRAM....................................................................................24
How It Works.....................................................................................................................24
TROUBLESHOOTING ...............................................................................25
Diagnostics Table...............................................................................................................25
Service & Repair Assistance ...............................................................................................26
ACCESSORIES..........................................................................................27
Software Interface Package................................................................................................27
USB Isolator.......................................................................................................................27

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 3 -
http://www.acromag.com
[3 ]
https://www.acromag.com
USB A-B Cable....................................................................................................................27
USB A-mini B Cable............................................................................................................27
USB OTG Cable ..................................................................................................................28
End Stops...........................................................................................................................28
SPECIFICATIONS .....................................................................................29
Model Number ..................................................................................................................29
Input .................................................................................................................................29
Output...............................................................................................................................31
USB Interface.....................................................................................................................33
Enclosure & Physical..........................................................................................................34
Environmental...................................................................................................................34
Agency Approvals ..............................................................................................................35
Reliability Prediction..........................................................................................................35
Configuration Controls.......................................................................................................35
REVISION HISTORY .................................................................................36
All trademarks are the property of their respective owners.
IMPORTANT SAFETY CONSIDERATIONS
It is very important for the user to consider the possible adverse effects of power, wiring, component, sensor, or software
failures in designing any type of control or monitoring system. This is especially important where economic property loss
or human life is involved. It is important that the user employ satisfactory overall system design. It is agreed between the
Buyer and Acromag, that this is the Buyer's responsibility.
The information of this manual may change without notice. Acromag, Inc. makes no warranty of any kind with regard
to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Further, Acromag, Inc. 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.

Model TT235-0600
RTD/Resistance Thermometer 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”.
The TT235-0600 is an ANSI/ISA Type 2 transmitter designed to interface with RTDs
(Resistance Temperature Detector), or resistive elements, isolate the input signal,
and modulate a 4-20mA current signal to drive a two-wire current loop. The
transmitter provides RTD sensor excitation, linearization, lead-wire compensation,
and lead break or sensor burnout detection. Configuration is performed using
software and a USB connection to Windows-based PC’s (Windows XP and later
versions only).
Key Features
•Fully configurable using Windows software via USB.
•Thin 12.5mm wide enclosure for high-density DIN-rail mounting.
•High measurement accuracy and linearity.
•Pt100, Pt200, Pt500, Pt1000, Copper, and Nickel type RTDs supported.
•25Ω, 450Ω, 2250Ω, and 4500Ω resistive ranges also supported.
•Connects to two-wire, three-wire, or four-wire sensors.
•Four-wire configuration eliminates error associated with lead-wire resistance.
•Up or down-scale lead-break/burnout detection.
•RTD inputs are linearized with respect to temperature.
•Supports Celsius, Fahrenheit, and Kelvin temperature units.
•Adjustable input range and selectable output ranges.
•Input and output circuits are fully isolated from each other.
•Convenient two-wire loop power with non-polarized output connections.
•Normal or reverse acting output.
•Namur compliant loop current.
•Variable input filter adjustment.
•Wide-range DC power input from 12–32VDC.
•Wide ambient temperature operation.
•Thoroughly tested and hardened for harsh environments.
•CE Approved.
•FCC Conformity Class B.
•UL/cUL Class I, Division 2 Approved.
•Model TT235-0600 is ATEX/IECEx Certified for Explosive Atmospheres.
II 3 G Ex ec IIC T4 Gc -40oC ≤Ta ≤+80oC
DEMKO 15 ATEX 1561X IECEx UL 18.0091X
Application
For additional information on
these devices and related
topics, please visit our web
site at www.acromag.com.
The TT235 transmitter is designed for high-density mounting on 35mm T-type DIN
rails. Modules may be mounted side-by-side on 0.5 inch (12.5mm) centers.
This model interfaces with RTD or resistive element inputs and isolates the input
signal allowing it to mate with grounded or non-grounded input signals. It provides
an output signal linearized to the RTD sensor temperature. Optionally, it can
support simple resistance input and drive an output signal linear with sensor
resistance.
!

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 5 -
http://www.acromag.com
[5 ]
https://www.acromag.com
The output signal is transmitted via a two-wire, 4–20mA current loop. The two-wire
current signal can be transmitted over long distances with high noise immunity. Its
inherent live-zero 4mA offset current offers built-in output fault detection, should
an output wire break. Extra connection screws at the output allow it to be
optionally wired for a “sourced” 4–20mA output configuration (see Output Wiring).
Mechanical Dimensions
Modules may be mounted to 35mm
“T” type DIN rail (35mm, type
EN50022), and side-by-side on
12.5mm (0.5-inch) centers.
NOTE:
IEC Safety Standards may require
that this module 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
Refer to the following figure for mounting and removing a module from the DIN rail.
Mounting
A spring loaded DIN clip is located on the input side bottom. The rounded edge of
the output side bottom allows the module to tilt upward so that it may be lifted
from the rail when prying the spring clip back with a screwdriver. To attach a
module to T-type DIN rail, angle the top of the module towards the rail and place
the top groove of the module over the upper lip of the DIN rail. Firmly push the
module downward towards the rail until it snaps into place.
Removal
To remove a module 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. A
screwdriver can be used to pry the pluggable terminals out of their sockets. 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
99.0
(3.90)
114.5
(4.51)
12.5
(0.50)
DIMENSIONS ARE IN MILLIMETERS (INCHES)

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 6 -
http://www.acromag.com
[6 ]
https://www.acromag.com
rail spring clip down while pulling the bottom of the module outward until it
disengages from the rail. Tilt the module upward to lift it from the rail.
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 14–26 AWG (2.08–0.13mm2) solid or stranded
wire with a minimum temperature rating of 85oC. Input wiring may be shielded or
unshielded type. Ideally, output wires should be twisted pair. Terminals are
pluggable and can be removed from their sockets by prying outward from the top
with a flat-head screwdriver blade.
T-Rail
35mm DIN Rail
SCREWDRIVER SLOT
FOR REMOVAL FROM
"T" TYPE DIN RAIL
TOP
BOTTOM
(INPUT SIDE)
(OUTPUT SIDE)
TT2XX MODULE DIN RAIL MOUNTING AND REMOVAL
SPRING CLIP
USE SCREWDRIVER TO REMOVE
MODULE FROM RAIL AS SHOWN
TT2XX MODULE
TILT MODULE UPWARD TOWARDS RAIL AND
HOOK ONTO UPPER LIP OF RAIL. ROTATE
MODULE DOWNWARD TO ENGAGE SPRING
CLIP ONTO LOWER LIP OF RAIL.
!

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 7 -
http://www.acromag.com
[7 ]
https://www.acromag.com
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). Since
common mode voltages can exist on signal wiring, adequate wire insulation should
be used and proper wiring practices followed. As a rule, output wires are normally
separated from input wiring for safety, as well as for low noise pickup.
Important –End Stops: For hazardous location installations (Class I, Division 2 or
ATEX/IECEx Zone 2) it must use two end stops (Acromag 1027-222) to secure the
module(s) to the DIN rail (not shown).
Sensor Input Connections
Sensor wires are connected directly to the transmitter input terminals at the
bottom of the transmitter (the spring-loaded DIN clip side), as shown in the
connection drawing below.
•Transmitter input signal is isolated from output.
•Three-wire input sensors require jumper: For three-wire sensors (including
resistive elements), a copper jumper wire must be connected between input
pins 1 and 4 ([+] and [H]).
•Two-wire input sensors require jumpers: For a two-wire sensor (including
resistive elements), a copper jumper wire must be connected between input
pins 4 and 5 ([–] and [L]) as well as pins 1 and 4 ([+] and [H]).
•Four-wire configuration eliminates error associated with lead-wire resistance:
A four-wire configuration allows the input sensor to be accurately measured
without having to compensate for the resistance of the lead-wires. RTDs are
typically measured by passing an excitation current through the RTD element
and relating the measured voltage drop across the RTD element with a
corresponding temperature. Because the lead-wires to the RTD element have
intrinsic resistance, a voltage drop is created in the lead-wires in addition to the
voltage drop across the RTD element. By using two dedicated wires to directly
measure only the RTD element, the voltage drop created by the resistance of
the lead-wires is removed from the measurement altogether.
!

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 8 -
http://www.acromag.com
[8 ]
https://www.acromag.com
INPUT SIDE OUTPUT SIDE
BOTTOM VIEW
(INPUT SIDE)
MODEL TT235-0600
DIN RAIL
SPRING CLIP
TB3
(OUTPUT)
TB1
(INPUT)
TB2
(INPUT)
21
H
43
–
L
+
TB4
(COMMON)
1
2
3
4
–
L
+
H
MODEL TT235-0600
INPUT SENSOR WIRING
SEE FOLLOWING PAGE
FOR INPUT SENSOR
WIRING DETAILS
INPUT SENSOR
SHIELDED
CABLE
SHIELDED CABLE IS RECOMMENDED.
FOR BEST RESULTS, GROUND THE
CABLE SHIELD AT THE END OF THE
CABLE CLOSEST TO THE GREATEST
POTENTIAL SOURCE OF DISTURBANCE,
USUALLY THE SENSOR END.
NOTE: SHIELDED CABLE GROUND
OPTIONAL
SHIELD
GROUND.
(SEE NOTE)

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 9 -
http://www.acromag.com
[9 ]
https://www.acromag.com
Sensor Input Connections
BOTTOM VIEW
(INPUT SIDE)
1
2
3
4
–
L
+
H
INPUT SENSOR WIRING
4-WIRE RTD
OPTIONAL
SHIELD
GROUND.
(SEE NOTE 2)
SHIELDED
CABLE
BOTTOM VIEW
(INPUT SIDE)
1
2
3
4
–
L
+
H
INPUT SENSOR WIRING
3-WIRE RTD
OPTIONAL
SHIELD
GROUND.
(SEE NOTE 2)
SHIELDED
CABLE
BOTTOM VIEW
(INPUT SIDE)
1
2
3
4
–
L
+
H
INPUT SENSOR WIRING
2-WIRE RTD
OPTIONAL
SHIELD
GROUND.
(SEE NOTE 2)
SHIELDED
CABLE
JUMPER
[+] TO [H]
JUMPER
[+] TO [H]
JUMPER
[–] TO [L]
BOTTOM VIEW
(INPUT SIDE)
1
2
3
4
–
L
+
H
INPUT SENSOR WIRING
RESISTANCE DECADE BOX
(4-WIRE CONFIGURATION)
OPTIONAL
SHIELD
GROUND.
(SEE NOTE 2)
SHIELDED
CABLE
SHIELDED CABLE IS RECOMMENDED. FOR BEST RESULTS, GROUND THE CABLE SHIELD AT THE END OF THE
CABLE CLOSEST TO THE GREATEST POTENTIAL SOURCE OF DISTURBANCE, USUALLY THE SENSOR END.
LEAD-WIRE RESISTANCE HAS A
NEGLIGIBLE EFFECT ON THE RTD
MEASUREMENT WHEN USING A
4-WIRE CONFIGURATION.
NOTE: LEAD-WIRE RESISTANCE
THE LEAD-WIRE RESISTANCE WILL
BE COMPENSATED FOR AS LONG
AS THE RESISTANCE OF THE [+] AND
[L] LEADS ARE MATCHED. ANY
UNBALANCE WILL CONTRIBUTE A
SHIFT IN THE RTD MEASUREMENT.
NOTE: LEAD-WIRE RESISTANCE
THE RESISTANCE OF THE [+] AND [–]
LEAD-WIRES WILL CONTRIBUTE A
POSITIVE SHIFT IN THE RTD
MEASUREMENT. THE DEGREE
AMOUNT SHIFTED WILL BE THE RTD
TEMPERTURE EQUIVALENT OF THE
TOTAL RESISTANCE OF THE [+] AND
[–] LEADS.
NOTE: LEAD-WIRE RESISTANCE
NOTE 2: SHIELDED CABLE GROUND
SEE NOTE 1 SEE NOTE 1
SEE NOTE 1 SEE NOTE 1
THIS GROUND CONNECTION IS RECOMMENDED FOR BEST RESULTS. IF SENSORS ARE INHERENTLY CONNECTED TO GROUND, USE
CAUTION AND AVOID MAKING ADDITIONAL GROUND CONNECTIONS WHICH COULD GENERATE GROUND LOOPS AND MEASUREMENT
ERRORS. DO NOT GROUND THE INPUT SENSOR IF UNIT IS CONNECTED TO A GROUNDED PC WITHOUT AN USB ISOLATOR.
NOTE 1: SENSOR GROUND
LEAD-WIRE RESISTANCE HAS A
NEGLIGIBLE EFFECT ON THE
RESISTANCE MEASUREMENT WHEN
USING A 4-WIRE CONFIGURATION.
NOTE: LEAD-WIRE RESISTANCE
21
H
43
–
L
+21
H
43
–
L
+
21
H
43
–
L
+21
H
43
–
L
+

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 10 -
http://www.acromag.com
[10 ]
https://www.acromag.com
Output/Power
Connections
Connect a DC power supply and load in series in the two-wire loop as shown in the
drawing below. This transmitter has an ANSI/ISA Type II output in which the
transmitter’s power and output signal share the same two leads, and the
transmitter output has a “floating” connection with respect to earth ground applied
at the loop supply minus terminal.
Output connections are not polarized. The output + and –designation are for
reference only with current normally input to Output+ and returned via
Output–(current-sinking).
Loop supply voltage should be from 12–32VDC with the minimum voltage level
adjusted to supply over-range current to the load, plus 11V MIN across the
transmitter, plus any transmission line drop.
Variations in power supply voltage between the minimum required and a
maximum of 32VDC across transmitter, has negligible effect on transmitter
accuracy.
Variation in load resistance has negligible effect on output accuracy, as long as
the loop supply voltage is set accordingly.
Note the traditional placement of earth ground in the current loop. The
transmitter output minus varies off this ground by the voltage drop in the load
resistance and lead-wire.
The traditional loop-powered “sinking” output connections are shown above.
Shielded twisted-pair wiring is often used at the output to connect the longest
distance between the field transmitter and the remote receiver as shown. The
output of this transmitter fluctuates relative to earth ground by the voltage drop in
the load and connection wire. This makes it flexible in the way it connects to various
“Receiver” devices.
ANY MODEL TT2XX-0600
I
I
I
RLOAD
THIS TRANSMITTER IS CURRENT LOOP POWERED
NOTE: OUTPUT TERMINALS ARE NOT POLARIZED AND
PLUS & MINUS LABELS ARE FOR REFERENCE ONLY.
OPTIONAL WIRING TERMINALS C ARE HELD IN
COMMON AND USED FOR "SOURCING" LOOP WIRING.
SEE OPTIONAL OUTPUT WIRING DIAGRAM.
5 6
–+
6
5
87
C C
INPUT SIDE OUTPUT SIDE TOP VIEW
(OUTPUT SIDE)
TB3
(OUTPUT)
TB1
(INPUT)
TB2
(INPUT)
TB4
(COMMON)
TRADITIONAL LOOP-POWERED "SINKING OUTPUT" CONNECTIONS
MODEL TT2XX-0600 OUTPUT/POWER WIRING
DC SUPPLY
(12–32V)
EARTH
GROUND
SHIELDED
TWISTED PAIR
4–20mA

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 11 -
http://www.acromag.com
[11 ]
https://www.acromag.com
Output/Power
Connections...
In most installations, the loop power supply will be local to either the transmitter,
or local to the remote receiver. Common receiver devices include the input channel
of a Programmable Logic Controller (PLC), a Distributed Control System (DCS), or a
panel meter. Some receivers already provide excitation for the transmitter loop and
these are referred to as “sourcing” inputs. Other receivers that do not provide the
excitation are referred to as “sinking” inputs, and these will require that a separate
power supply connect within the loop. These types of receivers are depicted below.
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 transmitter.
TIP –Ripple & Noise: Power supply ripple at 60Hz/120Hz is normally reduced at the
load by the transmitter, but additional filtering at the load can reduce this ripple
further. For large 60Hz supply ripple, connect an external 1uF or larger capacitor
directly across the load to reduce excessive 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, as close to the load
as possible.
TIP –Inductive Loads: If the two-wire current loop includes a highly inductive load
(such as an I/P current-to-pressure transducer), this may reduce output stability. In
this case, place a 0.1uF capacitor directly across the inductive load and this will
typically cure the problem.
+
-
6
5
"SINKING OUTPUT" CONNECTIONS WITH
LOOP+
LOOP-
+
-
TWISTED PAIR
I
I
POWER LOCAL TO THE RECEIVER
The 24V DC Excitation is
Provided by the Card
+
RCV
DCS/PLC SINKING
24VDC
Two-Wire Output Connections to the Input Card of a Distributed Control
System or Programmable Logic Controller.
+
-
24VDC POWER SUPPLY
I
I
COMMON TWO-WIRE TRANSMITTER CONNECTION TO "SOURCING" AND "SINKING" INPUT RECEIVERS
+
-
INPUT CARD
-
+
RCV
+
-
P
DCS/PLC SOURCING
24VDC
INPUT CARD
+
-
OR
SOURCING INPUT RECEIVER SINKING INPUT RECEIVER
The 24V DC Excitation is Provided
by a Separate Power Supply
MODEL TT2XX-0600 OUTPUT/POWER WIRING
ANY MODEL TT2XX-0600
5 6
–+
87
C C
INPUT SIDE OUTPUT SIDE TOP VIEW
(OUTPUT SIDE)
TB3
(OUTPUT)
TB1
(INPUT)
TB2
(INPUT)
TB4
(COMMON)

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 12 -
http://www.acromag.com
[12 ]
https://www.acromag.com
Output/Power
Connections...
This model includes two extra terminal connections at TB4 marked “C”, which
provide a convenient wiring point for a “sourcing” wiring variation as shown below.
Internally, these two terminals are connected in common with each other and do
not connect to the internal circuit. Use of these terminals in the wiring scheme
allows external power to be connected local to the transmitter and form a
“sourcing” output entity from this “sinking” output as shown.
Earth Ground Connections
The transmitter housing is plastic and does not require an earth ground connection,
except where the optional input cable shield is terminated on the transmitter If the
transmitter is mounted in a metal enclosure, an earth ground wire connection to
the metal enclosure’s ground terminal (green screw) is usually required using
suitable wire per applicable codes. See the Electrical Connections Drawing for
Output/Power connections and note the traditional position of earth ground for the
two-wire output current loop. Earth ground is normally applied at the output loop
power minus terminal and in common with the loop load or loop receiver minus.
The Type II transmitter output terminals have a floating connection relative to earth
ground and their potential varies with the voltage drop in the load and connection
wire.
Respect the traditional position of earth ground in a two-wire current loop and
avoid inadvertent connections to earth ground at other points in the output
circuit, which would drive ground loops and negatively affect operation. The
input circuit is isolated and may additionally be earth grounded.
A USB isolator is recommended when configuring or calibrating a transmitter to
avoid the ground loop that occurs if the input sensor is also earth grounded (PC
USB ports are commonly earth grounded and make contact with both the USB
signal and shield ground which is held in common to the input circuit ground of
the transmitter).
R
I
I
LOAD
OPTIONAL COMMON CONNECTIONS
WITH LOCAL EXTERNAL 3-WIRE POWER
FORM A SOURCING OUTPUT RELATIVE
TO THE REMOTE SINKING LOAD.
6
5
–
+
I
I
I
I
8
7
C
OPTIONAL "SOURCING" OUTPUT CONNECTIONS
WITH POWER LOCAL TO TRANSMITTER
C
ANY MODEL TT2XX-0600
5 6
–+
87
C C
INPUT SIDE OUTPUT SIDE TOP VIEW
(OUTPUT SIDE)
TB3
(OUTPUT)
TB1
(INPUT)
TB2
(INPUT)
TB4
(COMMON)
MODEL TT2XX-0600 OPTIONAL
OUTPUT/POWER WIRING
I
REMOTE
RECEIVER/LOAD
TWISTED PAIR
LOCAL 24VDC
POWER SUPPLY
24VDC
LOOP
LOOP

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 13 -
http://www.acromag.com
[13 ]
https://www.acromag.com
USB Connections
This transmitter is configured and calibrated via configuration software that runs on
Windows-based PCs connected to the transmitter via USB (Windows XP or later
version required). Refer to the following drawing to connect a PC to the transmitter
for the purpose of configuration and calibration using this software.
WARNING:
The intent of mating USB with this
transmitter is so that it can be
conveniently configured 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 transmitter while installed
in a hazardous area, as USB energy
levels could ignite explosive gases
or particles in the air.
•USB Signal Isolation is Required (See Below) –Acromag model USB-ISOLATOR
may be used to isolate the USB port, or optionally, 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.
IMPORTANT: USB logic signals to the transmitter are referenced to the potential of
the transmitter’s input ground. This ground is held in common with USB ground and
USB cable 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 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. The use of an isolator can be avoided if a battery
powered laptop PC is used to connect to the transmitter, and the laptop has no
other earth ground connection, either directly or via a connected peripheral.
PERSONAL COMPUTER
RUNNING WINDOWS OS
1 METER USB CABLE
USB-A MALE
TO HOST USB PORT
HOST
USB
HOST USB SERIAL
PORT CONNECTOR
AT BACK OF PC
CONFIGURATION
SOFTWARE
ACROMAG
HOST PC RUNNING
USB-B MALE
DEVICE
CONNECT
PC
CONNECT
POWER RESET
CONNECTION
USB-A MALE
TT SERIES USB TRANSMITTER CONNECTIONS
(REQUIRED)
USED FOR CONFIGURATION AND CALIBRATION OF THE TRANSMITTER IN A SAFE OR ORDINARY LOCATION
CABLE Model 4001-113
MODEL NO. - USB-ISOLATOR
Model 4001-112
Refer to Configuration Software Kit, Model TTC-SIP, which includes:
1 ea, Model 4001-113 USB Cable
1 ea, Model 4001-112 USB Cable
1 ea, Model USB-ISOLATOR
1 ea, Configuration Software CDROM 5040-944
USB MiniB MALE
USB MiniB Socket
(Front-Panel of Module)
12 –32V
DC POWER
SUPPLY
TB3-5
TB3-6
MODEL TT2XX TRANSMITTER
NOTE: USER MUST MEASURE
OUTPUT/POWER SIGNAL TO
CALIBRATE OUTPUT
TB3
(OUTPUT)
TB4
(COM)
TB1
(INPUT)
TB2
(INPUT)
LOAD
!

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 14 -
http://www.acromag.com
[14 ]
https://www.acromag.com
CONFIGURATION SOFTWARE
Quick Overview –Android
This transmitter can be configured and calibrated via the Acromag Agility™
Config Tool App. This software can be downloaded free of charge from the
Google Play store at play.google.com. To connect to this transmitter, a USB
OTG (On-The-Go) cable (Acromag 5028-565) and USB A to Mini-B cable
(Acromag 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 Setup –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 particular 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 Input and/or Output if Needed)
•On screen instruction will guide the setup 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 miscalibrate a transmitter.

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 15 -
http://www.acromag.com
[15 ]
https://www.acromag.com
Quick Overview –Windows
Click “Open” to connect to the TT235-0600
and the software will look similar to the
following:
This transmitter can be configured and calibrated via its configuration
software and a USB connection to a PC or laptop. The configuration
software is contained in a zip file that can be downloaded free of charge
from our web site at www.acromag.com. If you do not yet have a user
account, you will need to create one before the download becomes
accessible. The zip file will extract to an executable file which installs
software to the “/Program Files/Acromag” directory on your computer.
Note: You need administrator privileges on the PC you wish to install this
software. Once installed, navigate to the “/Program Files/Acromag”
directory and open the correct software for your particular model. This
software is also included on a CDROM bundled with the Configuration Kit
TTC-SIP (see Accessories). For this transmitter, use the software named
“TT235 Config.exe”.
The initial configuration software window for this transmitter is shown at
left. Configuration information is divided across three pages as follows:
Communication Setup, I/O Config/Test, and Calibration.
Communication Setup (First Connect to Transmitter 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.
I/O Config/Test (Configure and/or Test the Transmitter Here)
Optional - Click the [Get I/O Config] button to retrieve the I/O
configuration of the currently connected transmitter.
Select the Input Type: RTD Platinum, Copper, Nickel, or Resistance.
Select the Input Range: RTD alpha value, or resistance range.
Select the Configuration: Four-wire, Three-wire, or Two-wire.
Select the level of digital filtering: High, Medium, Low or None. The
corresponding I/O response times are listed in parenthesis next to the
filter selection.
Select the Break Direction: Under-range or Over-range.
Select the temperature units to use in the configuration software.
•Enter the I/O Scaling. Specify the input temperatures to correspond to
Zero-Scale and Full-Scale.
Submit the configuration settings to the transmitter by clicking the
[Send I/O Config] button to write the settings to the non-volatile
EEPROM memory.
For detailed configuration and calibration procedures, see the Operation
Step-By-Step section of the Technical Reference of this manual.

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 16 -
http://www.acromag.com
[16 ]
https://www.acromag.com
Quick Overview - Windows...
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 window and click to point to a
field or control to get a Help message
pertaining to the item you pointed to.
I/O Test (Optional, Verify Transmitter Operation Here)
After making I/O configuration changes, you can use the I/O Test controls
to start/stop polling the input channel to check your input readings.
Click “Start Polling” to periodically read your input channel and validate its
operation. Click “Stop Polling” to stop polling the input channel. Note the
simulated red lamp next to the button flashes slowly when the software is
polling the input channel.
CALIBRATION (Calibrate the Input and/or Output if Needed)
This transmitter has already been factory calibrated. If you encounter
excessive error, you can click the Calibration tab to display the Calibration
control page as shown at left.
To calibrate the Input or Output stage of this transmitter, simply click the
respective “Cal Instructions” button and follow the prompts.
Input…
Before calibration, first select the Input Type to calibrate from the I/O
Config page and be sure to click the [Send I/O Config] button. On the
Calibration page, click the [Input Cal Instructions] button to begin input
calibration.
When you click [Zero-Scale] or [Full-Scale] of the Input Calibration
section, you will be prompted to apply a specific resistance at the input
terminals. Once you have applied this resistance to the correct input pins,
click the [OK] button of the prompt to calibrate the input.
Output…
Click the [Output Cal Instructions] button to begin output calibration.
When you click [Zero-Scale] or [Full-Scale] of the Output Calibration
section, you will be prompted to measure the output signal and enter the
measurement in the field provided. Click the [Submit Measurement]
button to calibrate the output.
Factory Settings (Use only in case of trouble or for sanitation purposes)
•Restore a transmitter to its original factory calibration
•Restore a transmitter to its initial factory configuration
You can click the [Restore Factory] buttons if you ever misconfigure or
miscalibrate a transmitter in such a way that its operation appears erratic.
Calibration Status (Bottom of Window)
The Calibration Status bar at the bottom of the window will display status
messages relative to calibration.

Model TT235-0600
RTD/Resistance Thermometer 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.
Before attempting to reconfigure or
recalibrate this transmitter, verify
the following electrical
connections:
Calibration Connections:
NOTE: When calibrating, the input source, output meter, and load resistor (for
current output) must be accurate beyond the transmitter specifications, or better
than ±0.1%. As a general rule, calibration equipment accuracy should be four times
better than the rated accuracy you are trying to achieve with this transmitter.
Connect Input: Connect a precision resistance decade box to the input at TB1 and
TB2 according to the RTD configuration you will be using (Refer to Sensor Input
Connections). The resistance source must be adjustable over the range desired for
zero and full-scale. All input types share the same wiring and procedure for the
purpose of calibration.
Calibration & Configuration Connections:
Connect Output/Power: Refer to Output/Power Connection section and wire an
output current loop to the transmitter as illustrated. You will need to measure the
output current accurately in order to calibrate the transmitter. You can connect a
current meter in series in this loop to read the loop current directly (not
recommended). Alternatively, you could simply connect a voltmeter across a series
connected precision load resistor in the loop, and accurately read the output
current as a function of the IR voltage drop produced in this resistor
(recommended). In any case, be sure to power the loop with a voltage that is
minimally greater than the 11V required by the transmitter, plus the IR drop of the
wiring and terminals, plus the IR drop in the load. To computer the IR drop, be sure
to use a current level that considers the over-scale current (up to 24mA).
Loop Power Supply Voltage: Make sure your voltage level is at least 11V plus
0.020*load_resistance. Ideally, it should be great enough to drive the 24mA over-
range current into your load (i.e. up to 11V+ 0.024*Rload, assuming line drop is
negligible and the maximum possible over-range is considered). Always apply
power to the transmitter output loop even when connected to USB.
Connect to PC via USB: Refer to USB Connections section and connect the
transmitter to the PC using the USB isolator and cables provided in the
Configuration Kit TT-SIP.
Now that you have made your connections and applied power to your loop, you
can execute the “TT235 Config.exe”software to begin configuration of the
transmitter (software is compatible with XP or later versions of the Windows
operating system).
Connect Input
Connect
Output/Power
Connect PC/USB
Configure
Optional
Calibrate I/O

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 18 -
http://www.acromag.com
[18 ]
https://www.acromag.com
Connections...
NOTE: You should already have power connected to the
transmitter. You will not be able to calibrate or test the
transmitter without power applied.
After executing the Acromag Configuration software for this
transmitter, the window shown at left will appear, if you have not
already connected to the transmitter via USB (note fields are blank
under these conditions).
Connect your PC to the transmitter via USB, and the transmitter’s
model-serial information will appear in the device field as shown in
the second window at left.
If you happen to be connected to more than one transmitter via a
USB hub, you can use the device scroll field to select another
transmitter, using the serial information suffix of the model
number to discern one transmitter from another.
Select a transmitter from the drop down menu. When you click on
a transmitter name from the drop down menu, the software will
automatically attempt to open a connection with the selected
transmitter. If the software does not have an open connection
with the transmitter, click the [Open] button to open a connection
with the transmitter.
After opening a connection to a transmitter, the transmitter’s
Model, Serial Number, Manufacturer, and connection status will
be displayed as shown in the image on the left. In addition, the
Status field will indicate “Device opened successfully” as shown in
the image at left.

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 19 -
http://www.acromag.com
[19 ]
https://www.acromag.com
Configuration
At this point, you can click the “I/O Config/Test” tab to begin
configuring the transmitter, or to optionally test its operation.
The I/O Config/Test window is the second image shown at left.
When you click the “I/O Config/Test” tab, the software retrieves
the transmitter’s current configuration and displays it similar to
the second image shown at left.
If you are connected to a transmitter, the initial I/O Config page
represents the current configuration of the connected
transmitter before making changes. Otherwise, if you have
loaded the configuration from a saved a file, or if you have made
changes to any fields, you can click the [Get I/O Config] button to
retrieve the transmitter’s current configuration.
NOTE: If you make any changes to the selections indicated, the
only way to preserve your changes is to write them to the
transmitter by clicking the [Send I/O Config] button after
completing your selections, or save them to a file by opening the
“File” menu in the upper left-hand corner of the window.
Select the Input Type...
•If you select a RTD type, the output will be linear with respect
to the sensor temperature.
•If you select Resistance,the output will be linear with respect
to the input resistance, not temperature, and no special
linearization will be performed.
Select the Input Range...
•If RTD Input Type is selected, then the Input Range menu will
display RTD alpha values. Refer to “RTD Resistance versus
Temperature” section for an explanation of alpha value.
•If Resistance Input Type is selected, then the Input Range
menu will display resistance ranges. Select the lowest
resistance range that can support the input resistance full-
scale.
Select the Configuration...
•If you select “Four-wire”, the sensor lead-wire resistance will
have a negligible effect on the sensor measurement.
•If you select “Three-wire”, the sensor lead-wire resistance
will be compensated for, as long as the [+] and [L] leads are
of the same length, size, and type.
•If you select “Two-wire”, the sensor lead-wire resistance will
not be compensated for, and the total resistance of the ±
lead-wires will contribute a positive shift in the sensor
measurement.

Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: [phone] - 20 -
http://www.acromag.com
[20 ]
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 window
and click on a field or control to get a Help message
pertaining to the item you clicked on.
NOTE:
Under-range (3.5mA) and over-range (24mA)
capability is built into the output range by design.
See Output Specifications for more detail.
Select the Input Filtering...
Select the level of digital filtering to apply to the input channel as
“None”, “Low”, “Medium”, or “High”. The respective I/O
response times are indicated in parenthesis next to the filter
selection. Note that higher filter levels results in lower average
noise, but with slower I/O response times.
Select the Break Direction...
Upon sensor burnout or a broken sensor lead, you can select
“Under-range” to send the output to its under-range limit, or
“Over-range” to send the output to the over-range limit. Note
that outputs can be reverse acting, but in the case, under-range
and over-range remain normal. Under-range and over-range limits
are outside the nominal output range selected.
Select the Temperature Units...
Select the temperature units to use in the Configuration Software.
You may select Celsius, Fahrenheit, or Kelvin.
Enter the I/O Scaling values...
You may rescale the input range to use only a portion of the input
range to drive the output if desired. Be careful not to reduce the
input range too much, as resolution will be proportionally
diminished and noise/error magnified.
In the corresponding I/O Scaling field, enter the input signal
minimum/zero value to correspond to the output range Zero-
Scale value (4mA). Also set the input range Full-Scale (20mA). You
can optionally swap I/O Scaling values to configure a reverse
acting output response if desired. Note: Under-range (3.5mA) and
over-range (24mA) is built into the output range by design.
If the I/O Scaling Zero-Scale and Full-Scale points are chosen too
close together, performance will be degraded.
Submit I/O Configurations
Once you have made your configuration selections, click the [Send
I/O Config] button to write them to the transmitter. You can read
the status of your sent message in the “Status” field. Alternately,
you could click “File” in the upper left-hand corner to save the
configuration settings to a file on your PC for later reference.
At this point, you can test the transmitter’s operation by clicking
on the [Start Polling] button of the TEST I/O Section of the page to
trigger the software to periodically read the input and display its
value in the field to the right of the polling toggle button. Note the
simulated lamp next to the button flashes each time the input is
sampled. Click [Stop Polling] to stop polling the input.