TC-32 and TC-32-EXP
USB/Ethernet-Based High-Precision Thermocouple
Measurement Devices
Features• USB and Ethernet interface• 32 differential thermocouple(TC) inputs with 24-bit
resolution− Expandable to 64 TC inputs
with TC-32-EXP expansion
module− TC channel-to-host isolation
A TC-32 connected to a TC-32-EXP device provides up to 64 TC inputs, 16 digital inputs,
and 64 digital outputs which can be configured as alarms. All DIO channels are isolated.

Overview
The TC-32 and TC-32-EXP offer exceptional performance and accuracy for thermocouple (TC) measurement applications at a low cost per channel. Offering both
Ethernet and USB ports, the TC-32 provides 32 channels of 24-bit resolution for
medium channel installations.
The TC-32-EXP adds 32 high-precision channels to support larger installations.

− Easy-to-connect mini-jackconnectors− 3 S/s per channel maximum
sample rate
− Cold-junction compensation(CJC) sensor per channel− Open thermocouple
detection• 8 digital inputs and 32 digital
outputs/alarms

Accuracy is designed into the product with sigma-delta 24-bit ADCs, differential
inputs, TC-to-host isolation and cold-junction compensation (CJC) for each channel to reduce the effects of thermal gradients.

− Expandable to 16 digital
inputs/64 digital outputs with
TC-32-EXP expansion device

With digital alarming notifications when a temperature exceeds programmed limits,
the TC-32 and TC-32-EXP offer the perfect solution for temperature monitoring
applications including server rooms, refrigerated storage, and long-run test cells− Isolated from TC inputs andhost

Channel Expansion with the
TC-32-EXP
Connect a TC-32-EXP expansion device
to double the number of TC inputs (64),digital inputs (16), and digital outputs/
alarms (64).
The TC-32-EXP connects to the host TC-32
through a 40-pin expansion connector.
The host TC-32 provides all power to the
TC-32-EXPThe TC-32-EXP supports all of the TC
input and digital I/O features of the host
TC-32, including built-in cold-junction
compensation and open thermocouple
detection.

USB or Ethernet Interface

TC Input• 19” rack mountable

Connect up to 32 differential TC input
channels using the four groups of eightmini-jack connectors on the front panelof each device.

• Requires external power (power
adapter included with TC-32)

Both the TC-32 and TC-32-EXP support amaximum sample rate of 3 S/s per channel,
and TC types J, K, R, S, T, N, E, and B. TC
types are software-selectable per channel.

• Windows 11/10/8/7/
Vista® 32/64-bit• Linux®
• Android™

Cold-Junction Compensation(CJC)

Data Linearization

Each TC input on TC-32 devices has ahigh-resolution CJC sensor that provides a
local cold-junction temperature reference
point. This feature ensures the highest levelof temperature measurement accuracy.

The TC-32 can communicate with a hostdevice through either USB or 10/100
Ethernet. By offering both USB and
Ethernet ports, the TC-32 is the perfectsolution for local or remote monitoring.

Measurement Computing− 50-pin header connector(cable sold separately)(508) 946-5100

Supported Operating Systems

After the device performs CJC correction,
an onboard microcontroller automaticallylinearizes the TC data using National
Institute of Standards and Technology (NIST)
linearization coefficients for the selected
TC type.
The data is then output as a 32-bit floating point value in the configured format(voltage or temperature).

1

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TC-32 and TC-32-EXP
Features
Open-Thermocouple
Detection (OTD)
TC-32 devices are equipped with OTD for
all TC input channels. When enabled,
OTD allows users to monitor their TCs
and determine if they are broken or disconnected.

Connecting TCs to CommonMode Voltage Sources
Thermocouple inputs are isolated andthermocouple common-mode voltage
may deviate up to 48 VDC or 3.5 VAC (at60 Hz) from chassis ground without any
negative impact to measurement accuracy. Common-mode voltages between
channels, however, should not vary morethan ±1.4 VDC (refer to Common mode
voltage range specifications on page 4
for more information).

Digital I/O and Alarms
The TC-32 provides up to 8 digital inputs
and 32 digital outputs that are electricallyisolated from the host device and fromthe TC-32 analog circuits. This configuration allows users to optionally configure
a digital output as an alarm for each TC
channel.
When configured as an alarm, the digital
output line is driven to the appropriate
state determined by the alarm options
and input temperature.
Users can also use the alarm outputs
to control a device or application thatindicates:

The TC-32 can connect to an Ethernet or USB port. Both the TC-32 and TC-32-EXP include
50-pin connectors that provide access to all DIO channels. Adding the TC-32-EXP expansion
device doubles the channel count of the system.

Alarm Input Modes

lowing alarm error modes:

Users can set independent temperaturethresholds T1 and T2 for each alarm andenable one of the the following alarm
input modes:•

Alarm disabled; digital output line
can be used for normal operation•

Trigger alarm when input temperature ≥ T1; reset alarm when input
temperature < T2

Alarm enabled; active low output(output line goes low when alarm
condition is met)•

Trigger alarm when input temperature ≤ T1; reset alarm when input
temperature > T2

Alarm enabled; active high output(output line goes high when alarm
condition is met)•

Alarm output may be latched andwill not clear unless explicitly
cleared by the user

•

•

•

Trigger alarm when input temperature is < T1 or > T2

Alarm Error Modes•

when a software-selectable temperature threshold has been exceeded

Users can set the conditions that trigger
each alarm by selecting the following
alarm error modes:•

when an open TC has been detected••

when the common mode voltage isout of range

Trigger alarm based on temperature
reading only•

Trigger alarm based on temperature reading, open thermocouple
detected, or common-mode voltage
error

All alarm mode settings can be configured
with InstaCal.
•

Trigger alarm based on open thermocouple detected or commonmode voltage out-of-range error
only

Alarm Output Modes
Users can set the behavior of each digital/
alarm output by selecting one of the fol-

Measurement Computing(508) 946-5100

2

Power
The TC-32 requires external power. A
5 V, 10 W power adapter (PS-5V2AEPS)
is included with the TC-32.
The TC-32 provides power to the
TC-32-EXP when they are connected.

Calibration
Both the TC-32 and TC-32-EXP arefactory-calibrated using a NIST-traceablecalibration process. Specifications areguaranteed for one year. For calibration
beyond one year, return the device to thefactory for recalibration.
The TC-32 and TC-32-EXP devices also
support field calibration so that users cancalibrate a device locally.

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TC-32 and TC-32-EXP
Software
Software Support
The TC-32 and TC-32-EXP are supported by the software in the table below.
Ready-to-Run Applications
Data acquisition companion software with drag-and-drop interface that is used to acquire,view, and log data, and generate signals. DAQami can be configured to log analog, digital, andcounter channels, and to view that data in real-time or post-acquisition on user-configurable
displays. Logged data can be exported for use in Excel® or MATLAB®. Windows OS

DAQami™

DAQami is included with the free MCC DAQ Software bundle.

An interactive installation, configuration, and test utility for MCC hardware. Windows OS

InstaCal™

InstaCal is included with the free MCC DAQ Software bundle.

TracerDAQ™ andTracerDAQ Pro

Virtual strip chart, oscilloscope, function generator, and rate generator applications used togenerate, acquire, analyze, display, and export data. Supported features may vary by hardware.
The Pro version provides enhanced features. Windows OS
TracerDAQ is included with the free MCC DAQ Software bundle.
TracerDAQ Pro is available as a purchased software download.

General-Purpose Programming Support
Universal Library™
(UL) for Windows

UL for Android™

Library for developing applications in C, C++, VB, C# .Net, VB .Net, and Python on Windows.
The UL for Windows is included with the free MCC DAQ Software bundle.
The UL Python API for Windows is available on GitHub (https://github.com/mccdaq/mcculw).
Programming library of Java classes for programmers who develop apps for Android-based
tablets and phones. UL for Android communicates with select MCC DAQ devices. Supports
Android project development on Windows, Linux, Mac OS X
UL for Android is included with the free MCC DAQ Software bundle.
Library for developing applications in C, C++, and Python on Linux.

UL for Linux®

UL for Linux is available on GitHub (https://github.com/mccdaq/uldaq).
Open-source, third-party Linux drivers are also available for supported MCC devices.

Application-Specific Programming Support
ULx forNI LabVIEW™

DASYLab®

Measurement Computing

A comprehensive library of VIs and example programs for NI LabVIEW that is used to develop
custom applications that interact with most MCC devices. Windows OS
ULx for NI LabVIEW is included with the free MCC DAQ Software bundle.
Icon-based data acquisition, graphics, control, and analysis software that allows users to create
complex applications in minimal time without text-based programming. Windows OS
DASYLab is available as a purchased software download. An evaluation version is available for28 days.

(508) 946-5100

3

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TC-32 and TC-32-EXP
Specifications
TC-32 and TC-32-EXP Block Diagram

TC 0+ (high)TC 0– (low)TC 31+ (high)TC 31– (low)TC Connectors

CJC Sensors(32)
16(Ch 0-15)

Input
FiltersCJC I/O (0-31)

24-bit
ADC

Mux

Isolated
Microcontroller
DigitalIsolator

VREF
16(Ch 16-31)

Input
Filters

24-bit
ADC

Mux

32

DigitalInputsDigital Isolator

Digital Outputs
and Alarms

Isolated DC-DC

SPI+3.3 VA+5 VA+12 VA+5 VA

USB
Ethernet+3.3 V
Regulator

Isolated
Power
Supplies+5 V

Overvoltage/Negative
Supply Protection

Ext. Power

Isolation Barrier

Control Signals
Control Signals+12 VA+5 VA+3.3 VA

Specifications

Common mode voltage range
TCx channel to TCx channel: ±1.40 V
TCx channel relative to chassis ground,
fin = 60 Hz: ±3.5 VAC p-p
TCx channel relative to chassis ground: ±48 VDCWhen thermocouple sensors are connected to different common mode voltages,
the channels with floating thermocouples sensors are biased to approximately
the average value of the applied common mode voltages. Each of the appliedcommon mode voltages must then be less than or equal to the average common mode voltage ±1.40 V or [CMVapplied ≤ (CMVaverage ±1.4 V)].
Input noise (50 Hz or 60 Hz filtering): 510 nV rms
Gain error: 50 Hz or 60 Hz filtering: 0.004 % FSR
Offset error: 50 Hz or 60 Hz filtering: 3 µV
Measurement sensitivity (smallest change in temperature that can be detected)
Thermocouple type J,K,T,E,N: 0.05 °C
Thermocouple type R,S: 0.10 °C
Thermocouple type B: 0.15 °C
Warm-up time: 20 minutes min
Open thermocouple detect response time: 1 s
CJC sensor accuracy (0 °C to 45 °C): ±0.20 °C typ, ±0.40 °C max

All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
These specifications apply to both the TC-32 and TC-32-EXP unless noted otherwise.

Thermocouple Input

A/D converter type: Delta-Sigma
A/D resolution: 24-bit
Number of channels: 32 (64 when TC-32 connected to TC-32-EXP)
Filtering options: 50 Hz or 60 Hz noise filtering, software-selectable
Isolation between any TC input channel and chassis ground: 500 VDC absolute max
Channel configuration: Software-selectable to match TC sensor type
Differential input voltage range: ±78.125 mV
Absolute maximum input voltage (between any two TCx inputs): ±25 V (power on),
±25 V (power off)
Differential input impedance
50 Hz filtering, power on: 26 MΩ
60 Hz filtering, power on: 20 MΩ
Input current
Open thermocouple detect disabled: 2 nA
Open thermocouple detect enabled: 75 nA
Common mode rejection
50 Hz filtering, at DC and fin=50 Hz: 110 dB
60 Hz filtering at DC and fin=60 Hz: 110 dB
Noise rejection
50 Hz filtering at fin=50 Hz: 80 dB typ
60 Hz filtering at fin=60 Hz: 80 dB typ
Input bandwidth
50 Hz filtering: 22 Hz
60 Hz filtering: 26 Hz
Crosstalk between any two TC inputs: -90 dB
Sample rate: 3 Hz max (per channel)
The enabled thermocouple inputs are continuously converted at the maximum
A/D converter rate.

Measurement Computing

Isolated
Power
Supplies

Microcontroller

Expansion Connector(Expansion/Host
Device)Expansion
Connector
Ex
xpansion Connector(Host /Expansion/Expansion(Host
Device)Device))User I/O Connector+3.3 V8

TC-32 Only

Isolation Barrier(508) 946-5100

Channel Configuration

Thermocouple (J, K, S, R, B, E, T, N): 32 differential channels
Channel configuration is stored on EEPROM external to the isolated microcontroller by the firmware whenever any item is modified. Modification is performedby commands issued from an external application, and the configuration ismade non-volatile through the use of the EEPROM.

Compatible Thermocouple Sensors
Thermocouple

J: –210 °C to 1200 °C
K: –270 °C to 1372 °C
S: –50 °C to 1768 °C
R: –50 °C to 1768 °C

4

B: 0 °C to 1820 °C
E: –270 °C to 1000 °C
T: –270 °C to 400 °C
N: –270 °C to 1300 °C

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TC-32 and TC-32-EXP
Specifications
Accuracy

Thermocouple measurement accuracy specifications include polynomial linearization, cold-junction compensation, and system noise. The accuracy specifications assume the device is operated within its enclosure andwith the enclosure in a horizontal, upright orientation.
The device should also be warmed up for the recommended 20 minutes. If the maximum digital output load of
3.2 amps is applied, add an additional 0.30 °C to the typical and maximum accuracy specifications listed below.
Errors shown do not include inherent thermocouple error. Contact your thermocouple supplier for details on
the actual thermocouple accuracy error.

Thermocouple Measurement Accuracy, Including CJC Measurement Error
All Specifications are (±)
Accuracy Error
SensorType

SensorTemperature

Maximum,
15 °C to 35 °C

Typical,
15 °C to 35 °C

Maximum,
0 °C to 45 °C

Typical,0 °C to 45 °C

J–210 °C

1.965 °C

0.910 °C

2.167 °C

0.989 °C

K

00.787 °C

0.361 °C

0.816 °C

0.375 °C

1200 °C

0.752 °C

0.371 °C

1.148 °C

0.508 °C

–210 °C

2.295 °C

1.061 °C

2.520 °C

1.152 °C

00.821 °C

0.376 °C

0.852 °C

0.392 °C

1372 °C

1.029 °C

0.504 °C

1.560 °C

0.688 °C–50

2.467 °C

1.111 °C

2.655 °C

1.223 °C

S

250 °C

1.835 °C

0.825 °C

1.961 °C

0.904 °C

1768 °C

0.893 °C

0.361 °C

1.519 °C

0.590 °C

R

B

E

T

N

–50

2.609 °C

1.174 °C

2.810 °C

1.293 °C

250 °C

1.862 °C

0.837 °C

1.992 °C

0.918 °C

1768 °C

0.754 °C

0.305 °C

1.346 °C

0.520 °C

250 °C2.450 °C

1.090 °C

2.707 °C

1.254 °C

700 °C0.937 °C

0.424 °C

1.136 °C

0.520 °C

1820 °C

0.610 °C

0.300 °C

1.056 °C

0.467 °C

–200 °C

1.754 °C

0.811 °C

1.933 °C

0.880 °C

00.775 °C

0.355 °C

0.806 °C

0.369 °C

1000 °C

0.657 °C

0.323 °C

0.989 °C

0.437 °C

–200 °C

2.005 °C

0.923 °C

2.207 °C

1.005 °C

00.836 °C

0.382 °C

0.874 °C

0.400 °C

400 °C0.544 °C

0.255 °C

0.659 °C

0.297 °C

–200 °C

2.255 °C

1.038 °C

2.481 °C

1.134 °C

00.908 °C

0.415 °C

0.949 °C

0.437 °C

1300 °C

0.718 °C

0.357 °C

1.157 °C

0.510 °C

Digital Input

Number of inputs: 8 channels (16 when TC-32 connected to TC-32-EXP)
Configuration: Fixed input
Input voltage range: 0 V to +15 V
Input type: CMOS (Schmitt trigger)
Input characteristics: 100 kΩ pull-up resistor, 28.7 kΩ
series resistor
Maximum input voltage range: 0 V to +20 V max(power on/off, relative to IGND pins)
Pull-up configuration: All pins pulled up to +5 V via
individual 100 kΩ resistors using slide switch SW5.
SW5 default position are on (pulled up).
Transfer rate (software paced): 500 port reads per
second typ

Measurement Computing

Input high voltage: 1.3 V min, 2.2 V max
Input low voltage: 1.5 V max, 0.6 V min
Schmitt trigger hysteresis: 0.4 V min, 1.2 V max

Digital Output

Number of outputs: 32 channels, shared with alarms(64 when TC-32 connected to TC-32-EXP)
Configuration: Open drain output
Output characteristics: 100 kΩ pull-up, open drain(DMOS transistor)
Pull-up configuration: All pins pulled up to +5 V
through individual 100 kΩ resistors using slide
switches SW1-SW4. The default positions for
SW1-SW4 are on (pulled up.)(508) 946-5100

5Transfer rate (software paced): 500 port writes per
second typ
Output voltage range
0 V to +5 V (internal 100 kΩ pull-up resistors connected to +5 V by default)
0 V to +15 V max (using external pull-up resistor)
Ground pins labeled IGND are isolated from AGND
and chassis ground.
Off state leakage current: 0.1 µA
Sink current capability: 100 mA max (continuous)
per output pin
DMOS transistor on-resistance (drain to source): 4 Ω

Temperature Alarms

Number of alarms: 32, shared with digital output
Alarm functionality: Each alarm controls its associated digital output line as an alarm output. Whenan alarm is enabled, its associated output line isdriven to the appropriate state determined by thealarm options and input temperature. The alarmconfigurations are stored in non-volatile memory
and loaded at power on.
Alarm input modes (T1 and T2 can be independently set for each alarm)
Alarm when input temperature ≥ T1, reset alarm
when input temperature < T2
Alarm when input temperature ≤ T1, reset alarm
when input temperature > T2
Alarm when input temperature is < T1 or > T2
Alarm error modes
Alarm on temperature reading only
Alarm on temperature reading, open thermocouple,
or common-mode voltage error
Alarm on open thermocouple or common-mode
voltage error only
Alarm output modes
Disabled, digital output line may be used for normal
operation
Enabled, active high output (output line goes highwhen alarm condition is met)
Enabled, active low output (output line goes low
when alarm condition is met)
Alarm output may be latched and will not clear
unless explicitly cleared by the user
Alarm latency: 1 second, max
Alarm settings are applied when changed and at
power-on. Temperatures are constantly converted
on enabled channels and processed for alarm
conditions regardless of the communications
connectivity.

MemoryEEPROM: 4,096 bytes

Microcontroller

Type: One high-performance 32-bit RISC microcontroller

USB (TC-32 Only)

Device type: USB 2.0 full speed
Device compatibility: USB 1.1, USB 2.0, USB 3.0
Connector: Standard B
Cable length: 5 meters max
Power: Self-powered (no USB current consumed)

Network (TC-32 Only)
Ethernet Connection

Ethernet type: 100 Base-TX, 0 Base-T
Communication rates: 10/100 Mbps, auto-negotiatedConnector: RJ-45, 8 position
Cable length: 100 meters max
Additional parameters: HP Auto-MDIX support

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TC-32 and TC-32-EXP
Ordering
Order Information

Network Interface

Protocols used: TCP/IP (IPv4 only), UDP
Network ports used: UDP: 54211 (discovery)
TCP: 54211 (commands)
Network IP configuration: DHCP + link-local, DHCP, static, link-local
Network name: TC-32-xxxxxx, where xxxxxx are the lower 6 digits of thedevice MAC address
Network name publication: By NBNS (responds to b-node broadcasts, therefore
only available on the local subnet)

HardwarePart No.

Description

TC-32

USB- or Ethernet-based 24-bit, 32-channel thermocouple
input device with 8 digital inputs and 32 digital outputs/
alarms. Includes USB cable, Ethernet cable, power supply,and MCC DAQ software.

TC-32-EXP

24-bit, 32-channel thermocouple input expansion device
for TC-32 with 8 digital inputs and 32 digital outputs/
alarms. Includes 40-pin expansion cable for connection
to host TC-32.

Network Factory Default Settings

Factory default IP address: 192.168.0.101
Factory default subnet mask: 255.255.255.0
Factory default gateway: 192.168.0.1
Factory default DHCP setting: DHCP + link-local enabled

Network Security

Security implementation: TCP sockets are not opened unless application sends
the correct PIN code (stored in non-volatile memory, may be changed by user,
default value 0000)
Number of concurrent sessions: 1
Vulnerabilities: TCP Sequence Number Approximation Vulnerability

Accessories and Cables

Power (TC-32 Only)

Supply current: 330 mA typ, 610 mA max;
550 mA typ, 1000 mA max (with TC-32-EXP connected)
External power input: +5 VDC ± 5% (+5 VDC power supply provided)
Voltage specification applies at barrel plug power input. The power supply provided with the device meets this specification at the rated total power supply
current. If a different power supply is used, small line resistances could causesignificant voltage drop between the power supply and the barrel plug input.
Power switch: Rocker type
External power supply (included)
MCC p/n PS-5V2AEPS: +5 VDC, 10 W, 5% regulation
External power input voltage supervisor limits
4.0 V > Vext > 5.75 V: PWR LED = Off (power fault)
4.0 V < Vext < 5.75 V: PWR LED = On
Chassis ground connection: 6-32 screw on rear of enclosure

Part No.

Description

C40FF-x40-conductor ribbon cable, female to female; x is thelength in feet. Replacement expansion cable.

C50FF-x

50-conductor ribbon cable, female to female; x is thelength in feet. Use for DIO connections.

CIO-MINI50

50-pin universal screw-terminal board.

SCB-5050-pin signal connection box.

PS-5V2AEPS

Replacement power supply for TC-32 – interchangeable
plugs available separately

Sensors (Sold Separately)Part No.

Description

CN-144-JM

Type J male thermocouple connector

CN-144-KM

Type K male thermocouple connector

CN-144-TM

Type T male thermocouple connector

745690-J001

J-type thermocouple wire, fiberglass(0 °C to 482 °C, 32 °F to 900 °F) 1 m

745690-J002

J-type thermocouple wire, fiberglass(0 °C to 482 °C, 32 °F to 900 °F) 2 m

745690-K001

K-type thermocouple wire, fiberglass(0 °C to 482 °C, 32 °F to 900 °F) 1 m

745690-K002

Operating temperature range: 0 °C to 45 °C
Storage temperature range: –40 °C to 85 °C
Humidity: 0 °C to 90% non-condensing

K-type thermocouple wire, fiberglass(0 °C to 482 °C, 32 °F to 900 °F) 2 m

745690-T001

T-type thermocouple wire, fiberglass(0 °C to 260 °C, 32 °F to 500 °F) 1 m

Mechanical745690-T002

T-type thermocouple wire, fiberglass(0 °C to 260 °C, 32 °F to 500 °F) 2 m

Signal I/O Connectors

Software also Available from MCC

LED Displays and the Factory Reset Button

POWER LED (top): Indicates power on. Blinks when blink command is sent. Boththe POWER and ACTIVITY LEDs blink in firmware upgrade mode.
ACTIVITY LED: On when there is a valid connection and blinks when a command is sent to the TC-32-EXP. Both the POWER and ACTIVITY LEDs blinkin firmware upgrade mode.
ALARM LED: Indicates that an alarm condition is met.
OPEN TC LED (bottom): Indicates that there is an open thermocouple condition.
Factory reset button: When held for 3 seconds, the LEDs turn off for a short time,
indicating a reset is in process. When the LEDs turn back on, reset is complete
and the factory-default network settings are restored.

Environment

Dimensions (L × W × H):482.6 × 128.6 × 43.18 mm (19 × 6.15 × 1.74 in.)
User accessible I/O connectors (excluding USB and Ethernet): Thermocouple
inputs, digital I/O connector, expansion connector, chassis ground
Thermocouple connector type: Thermocouple Mini-Jack
Digital I/O connector type: 50-pin IDC header
Compatible cable for the 50-pin DIO connector: C50FF-x (where x = length in feet)
Compatible accessory products with the C50FF-x cable: CIO-MINI50, SCB-50
Expansion connector type: 40-pin IDC header
Compatible cables for the 40-pin expansion connector: C40FF-x (where x =length in feet)
Chassis ground connector: 6-32 screw

Measurement Computing
DS-TC-32(508) 946-5100

6Part No.

Description

TracerDAQ Pro

Out-of-the-box virtual instrument suite with strip chart,
oscilloscope, function generator, and rate generator –professional version

DASYLabIcon-based data acquisition, graphics, control, andanalysis software

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April 2020. Rev 5© Measurement Computing Corporation