National Instruments NI 9211E Specifications

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9211E

4-Channel Thermocouple Input Module

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This document describes how to use the National Instruments 9211E
and includes dimensions, terminal assignments, and specifications for
the NI 9211E. Visit ni.com/info and enter rdsoftwareversion
to determine which software you need for the modules you are using.
For information about installing, configuring, and programming the
system, refer to the system documentation. Visit
enter

cseriesdoc for information about C Series documentation.

Caution National Instruments makes no electromagnetic

ni.com/info and

compatibility (EMC) or CE marking compliance claims
for the NI 9211E. The end-product supplier is responsible
for conformity to any and all compliance requirements.

Caution The NI 9211E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be
present.

NI 9211E Operating Instructions and Specifications 2 ni.com

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NI 9211E Dimensions

The following figure shows the dimensions of the NI 9211E.

73.4 (2.89)

0.0 (0.00)

0.0 (0.00)

Figure 1. NI 9211E Dimensions in Millimeters (Inches)

© National Instruments Corp. 3 NI 9211E Operating Instructions and Specifications

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

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Connecting the NI 9211E

TC0+
TC0–
TC1+
TC1–
TC2+
TC2–
TC3+
TC3–
NC
COM

0
1
2
3
4
5
6
7
8
9

The NI 9211E has a 10-terminal, detachable screw-terminal
connector that provides connections for 4 thermocouple channels.

Figure 2. NI 9211E Terminal Assignments

NI 9211E Operating Instructions and Specifications 4 ni.com

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You can connect thermocouple input signals to the NI 9211E.
Connect the positive lead of the thermocouple to the TC+ terminal
and the negative lead of the thermocouple to the TC– terminal. If
you are unsure which of the thermocouple leads is positive and
which is negative, check the thermocouple documentation or the
thermocouple wire spool. If you are using shielded wiring, connect
one end of the shield to the COM terminal. The COM terminal is
internally connected to the isolated ground reference of the
module. Refer to Figure 3 for an illustration of a typical shielding
configuration.

Thermocouple

Figure 3. Connecting a Shielded Thermocouple Input Signal to the NI 9211E

© National Instruments Corp. 5 NI 9211E Operating Instructions and Specifications

Shield

TC+

TC–

COM

NI 9211E

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Note You must use 2-wire ferrules to create a secure

connection when connecting more than one wire to a
single terminal on the NI 9211E.

The NI 9211E channels share a common ground isolated from
other modules in the system. Each channel passes through a filter
and then a 24-bit analog-to-digital converter (ADC) samples the
channel. Each channel also has an open thermocouple detection
(OTD) circuit, which consists of a current source between the
TC+ and TC– terminals. If an open thermocouple is connected to
the channel, the current source forces a full-scale voltage across the
terminals. Refer to Figure 4 for an illustration of the circuitry for
one channel of the NI 9211E.

Each channel has a resistor that produces an input impedance
between the TC+ and COM terminals and between the TC– and
COM terminals. The gain and offset errors resulting from the
source impedance of connected thermocouples are negligible for
most applications. Thermocouples with a higher lead resistance
can introduce more significant errors. Refer to the Specifications
section for more information about errors resulting from source
impedance.

NI 9211E Operating Instructions and Specifications 6 ni.com

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TC+

10 MΩ

10 MΩ

TC–

COM

Input

Impedance

Open

Thermocouple

Detection

Current

Filtered

Differential

Amplifier

Isolated

ADC

NI 9211E

Figure 4. Input Circuitry for One Channel of the NI 9211E

© National Instruments Corp. 7 NI 9211E Operating Instructions and Specifications

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Temperature Measurement Accuracy
Considerations

Temperature measurement errors depend partly on the
thermocouple type, the accuracy of the thermocouple, the
temperature being measured, and the cold-junction temperature.
Refer to the Temperature Measurement Accuracy section in the

Specifications for the errors of each thermocouple type when

connected to the NI 9211E. The errors do not account for the
accuracy of the thermocouple itself.

For the best accuracy results, keep temperature gradients across
NI 9211E terminals to a minimum. Refer to the Minimizing

Thermal Gradients section for more information.

Cold-Junction Temperature Measurement Accuracy

Heat dissipated by adjacent modules or other nearby heat sources
can cause errors in thermocouple measurements by heating up the
NI 9211E terminals to a different temperature than the
cold-junction compensation sensor. The thermal gradient across
the terminals can cause the terminals of different channels to be at
different temperatures, in which case the resulting measurement
creates errors not only in absolute accuracy but also in the relative

NI 9211E Operating Instructions and Specifications 8 ni.com

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accuracy between channels. Refer to the Specifications section for
the cold-junction compensation accuracy specifications. Refer
to the Temperature Measurement Accuracy section in the

Specifications for the thermocouple accuracy specifications. Visit

ni.com/info and enter cjcdatascaling for more information

about isothermal errors and scaling CJC data.

Minimizing Thermal Gradients

Thermal gradients can be caused by changes in the ambient air
temperature near the front connector or by the thermocouple wire
if it conducts heat or cold directly to the terminal junctions. For the
best accuracy results, follow these guidelines for minimizing
thermal gradients:

• Use small-gauge thermocouple wire. Smaller wire transfers
less heat to or from the terminal junction.

• Run thermocouple wiring together near the screw-terminal
connector to keep the wires at the same temperature.

• Avoid running thermocouple wires near hot or cold objects.

• If you connect any extension wires to thermocouple wires,
use wires made of the same conductive material as the
thermocouple wires.

© National Instruments Corp. 9 NI 9211E Operating Instructions and Specifications

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• Minimize adjacent heat sources and air flow across the
terminals.

• Keep the ambient temperature as stable as possible.

Using the Autozero Channel

The NI 9211E has an internal autozero channel for measuring the
offset error. If the ambient temperature of the NI 9211E is less than
15 °C or more than 35 °C, use this channel to read the offset error.
Subtract the offset error from the data read from each NI 9211E
thermocouple input channel. Refer to the software help for
information about using the autozero channel. Visit
and enter

cseriesdoc for information about C Series

documentation.

NI 9211E Operating Instructions and Specifications 10 ni.com

ni.com/info

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Sleep Mode

This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.

© National Instruments Corp. 11 NI 9211E Operating Instructions and Specifications

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Specifications

The following specifications are typical for the range –40 to 85 °C
internal to any enclosures unless otherwise noted. Accuracy within
typical use can vary based on chassis, mounting parameters, other
modules present in the system, and installed accessories.

Input Characteristics

Number of channels..........................4 thermocouple channels,

1 internal autozero channel,
1 internal cold-junction
compensation channel

ADC resolution................................. 24 bits

Type of ADC..................................... Delta-Sigma

Sampling mode .................................Scanned

Voltage measurement range..............±80 mV

Temperature measurement ranges ....Works over temperature

NI 9211E Operating Instructions and Specifications 12 ni.com

ranges defined by NIST
(J, K, T, E, N, B, R, S
thermocouple types)

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Conversion time................................ 70 ms per channel;

420 ms total for all channels
including the autozero and
cold-junction channels

Common-mode voltage range

Channel-to-COM........................±1.5 V

COM-to-earth ground.................±250 V

Common-mode rejection ratio (0 to 60 Hz)

Channel-to-COM........................95 dB

COM-to-earth ground.................>170 dB

Input bandwidth (–3 dB)...................15 Hz

Noise rejection (at 50 and 60 Hz).....85 dB min

Overvoltage protection ..................... ±30 V between any input

and COM

Differential input impedance ............ 20 MΩ

Input current...................................... 50 nA

Input noise ........................................1 μV

© National Instruments Corp. 13 NI 9211E Operating Instructions and Specifications

rms

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Gain error.......................................... 0.05% max at 25 °C,

0.06% typ at –40 to 85 °C,

0.1% max at –40 to 85 °C

Offset error (with autozero

channel on)........................................ 15 μV typ, 20 μV max

Gain error from

source impedance..............................Add 0.05 ppm per Ω when

source impedance >50 Ω

Offset error from

source impedance..............................Add 0.05 μV typ, 0.07 μV

max per Ω when source
impedance >50 Ω

Cold-junction compensation sensor accuracy

1

0 to 85 °C ...................................0.6 °C typ, 1.3 °C max

–40 to 85 °C ...............................1.7 °C max

1

The maximum errors assume an isothermal error of 1.0 °C. Refer to the

Cold-Junction Temperature Measurement Accuracy section for more information.

NI 9211E Operating Instructions and Specifications 14 ni.com

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MTBF ............................................... 633,012 hours at 25 °C;

Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method

Note Contact NI for Bellcore MTBF specifications

at other temperatures or for MIL-HDBK-217F
specifications.

Temperature Measurement Accuracy

Measurement sensitivity

With autozero channel on

Types J, K, T, E, N............... <0.07 °C

Types B ................................ <0.25 °C

Types R, S ............................ <0.60 °C

1

Measurement sensitivity represents the smallest change in temperature that a sensor
can detect. It is a function of noise. The values assume the full measurement range
of the standard thermocouple sensor according to ASTM E230-87.

© National Instruments Corp. 15 NI 9211E Operating Instructions and Specifications

1

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With autozero channel off

Types J, K, T, E, N............... <0.05 °C

Type B ..................................<0.20 °C

Types R, S ............................ <0.45 °C

Figures 5, 6, 7, 8, and 9 show the typical and maximum errors

1

for
each thermocouple type when used with the NI 9211E over the full
temperature range. The figures also display the maximum errors
for the thermocouple types with the NI 9211E at room
temperature, which is 15 to 35 °C. The figures account for gain
errors, offset errors, differential and integral nonlinearity,
quantization errors, noise errors, and isothermal errors. The figures
do not account for the accuracy of the thermocouple itself.

1

The maximum errors assume an isothermal error of 1.0 °C. Refer to the

Cold-Junction Temperature Measurement Accuracy section for more information.

NI 9211E Operating Instructions and Specifications 16 ni.com

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4

3

2

1

Measurement Error (°C)

0

–200 0 200 400 600 800 1000 1200

Measured Temperature (°C)

Max (Autozero on), –40 to 85 °C
Typ (Autozero on), –40 to 85 °C

Max (Autozero off), room temp

Figure 5. Thermocouple Type J and N Errors

© National Instruments Corp. 17 NI 9211E Operating Instructions and Specifications

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4

3

2

1

Measurement Error (°C)

0

–200 0 200 400 600 800 1000 1200

Measured Temperature (°C)

Max (Autozero on), –40 to 85 °C
Typ (Autozero on), –40 to 85 °C

Max (Autozero off), room temp

Figure 6. Thermocouple Type K Errors

NI 9211E Operating Instructions and Specifications 18 ni.com

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© National Instruments Corp. 19 NI 9211E Operating Instructions and Specifications

–200 0 200 400 600 800 1000

0

2

3

4

Measurement Error (°C)

Measured Temperature (°C)

1

Max (Autozero on), –40 to 85 °C

Max (Autozero off), room temp

Typ (Autozero on), –40 to 85 °C

Figure 7. Thermocouple Type T and E Errors

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NI 9211E Operating Instructions and Specifications 20 ni.com

200 400 600 800 1200 1600 1800

0

2

4

6

Measurement Error (°C)

1000 1400

Measured Temperature (°C)

Max (Autozero on), –40 to 85 °C

Max (Autozero off), room temp

Typ (Autozero on), –40 to 85 °C

Figure 8. Thermocouple Type B Errors

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–200 0 200 400 600 800 1000 1200

0

2

4

6

Measurement Error (°C)

1400 1600

Measured Temperature (°C)

Max (Autozero on), –40 to 85 °C

Max (Autozero off), room temp

Typ (Autozero on), –40 to 85 °C

Figure 9. Thermocouple Type R and S Errors

© National Instruments Corp. 21 NI 9211E Operating Instructions and Specifications

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Power Requirements

Power consumption from chassis

Active mode ............................... 170 mW max

Sleep mode ................................. 4 mW max

Thermal dissipation (at 85 °C)

Active mode ............................... 170 mW max

Sleep mode ................................. 4 mW max

Physical Characteristics

Use a dry, low-velocity stream of air to clean the module. If
needed, use a soft-bristle brush for cleaning around components.

Note For two-dimensional drawings and

three-dimensional models of the C Series module and
connectors, visit ni.com/dimensions and search by
module number.

Screw-terminal wiring ...................... 12 to 24 AWG copper

conductor wire with 7 mm
(0.28 in.) of insulation
stripped from the end

NI 9211E Operating Instructions and Specifications 22 ni.com

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Torque for screw terminals ...............0.5 to 0.6 N · m

(4.4 to 5.3 lb · in.)

Ferrules ............................................. 0.25 mm

2

to 2.5 mm

2

Weight...............................................63 g (2.2 oz)

Safety

Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM ..............................±30 V max

Isolation

Channel-to-channel .................... None

Channel-to-earth ground

Continuous ...........................250 V

Measurement Category II,
(Double insulation)

Withstand .............................2,300 V

dielectric withstand test

Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.

© National Instruments Corp. 23 NI 9211E Operating Instructions and Specifications

,

rms

, verified by a 5 s

rms

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This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for U.S.
or 230 V for Europe.

Caution Do not connect the NI 9211E to signals or use

for measurements within Measurement Categories III
or IV.

Safety Standards

This product meets the requirements of the following standards of
safety for electrical equipment for measurement, control, and
laboratory use when installed in a suitable enclosure:

• IEC 61010-1, EN 61010-1

• UL 61010-1, CSA 61010-1

Note For UL and other safety certifications, refer to the

product label or the Online Product Certification section.

NI 9211E Operating Instructions and Specifications 24 ni.com

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Online Product Certification

To obtain product certifications and the Declaration of Conformity
(DoC) for this product, visit

ni.com/certification, search by

model number or product line, and click the appropriate link in the
Certification column.

Environmental

National Instruments C Series modules are intended for indoor use
only but may be used outdoors if installed in a suitable enclosure.
Refer to the manual for the chassis you are using for more
information about meeting these specifications.

Operating temperature

(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C

Storage temperature

(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C

Operating humidity

(IEC 60068-2-56).............................. 10 to 90% RH,

Storage humidity

(IEC 60068-2-56).............................. 5 to 95% RH,

© National Instruments Corp. 25 NI 9211E Operating Instructions and Specifications

noncondensing

noncondensing

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Maximum altitude............................. 2,000 m

Pollution Degree ...............................2

Environmental Management

NI is committed to designing and manufacturing products in an
environmentally responsible manner. NI recognizes that
eliminating certain hazardous substances from our products is
beneficial to the environment and to NI customers.

For additional environmental information, refer to the NI and the
Environment Web page at ni.com/environment. This page
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.

Waste Electrical and Electronic Equipment (WEEE)

EU Customers At the end of the product life cycle,

all products must be sent to a WEEE recycling center.
For more information about WEEE recycling centers,
National Instruments WEEE initiatives, and compliance
with WEEE Directive 2002/96/EC on Waste and
Electronic Equipment, visit

weee

.

NI 9211E Operating Instructions and Specifications 26 ni.com

ni.com/environment/

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Calibration

⬉ᄤֵᙃѻક∵ᶧ᥻ࠊㅵ⧚ࡲ⊩ ˄Ё೑

RoHS

˅

Ё೑ᅶ᠋

National Instruments

ヺড়Ё೑⬉ᄤֵᙃ

ѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ

(RoHS)

DŽ݇Ѣ

National InstrumentsЁ೑RoHS

ড়㾘ᗻֵᙃˈ䇋ⱏᔩ

ni.com/environment/rohs_china

DŽ

(For information

about China RoHS compliance, go to

ni.com/

environment/rohs_china

.)

You can obtain the calibration certificate and information about
calibration services for the NI 9211E at

Calibration interval ...........................1 year

© National Instruments Corp. 27 NI 9211E Operating Instructions and Specifications

ni.com/calibration.

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Where to Go for Support

The National Instruments Web site is your complete resource for
technical support. At
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.

National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at
and follow the calling instructions or dial 512 795 8248. For
telephone support outside the United States, contact your local
branch office:

Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,

NI 9211E Operating Instructions and Specifications 28 ni.com

ni.com/support you have access to

ni.com/support

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Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 328 90 10,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545

LabVIEW, National Instruments, NI, ni.com, the National Instruments corporate logo, and the Eagle logo are
trademarks of National Instruments Corporation. Refer to the Trademark Information at
for other National Instruments trademarks. Other product and company names mentioned herein are trademarks or
trade names of their respective companies. For patents covering National Instruments products/technology, refer to
the appropriate location: Help»Patents in your software, the
Instruments Patent Notice at

© 2009–2010 National Instruments Corp. All rights reserved.

372761B-01 Dec10

ni.com/patents.

patents.txt file on your media, or the National

ni.com/trademarks

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Artisan Technology Group is your source for quality

new and certied-used/pre-owned equipment

• FAST SHIPPING AND

DELIVERY

• TENS OF THOUSANDS OF
IN-STOCK ITEMS

• EQUIPMENT DEMOS

• HUNDREDS OF
MANUFACTURERS

SUPPORTED

• LEASING/MONTHLY
RENTALS

• ITAR CERTIFIED
SECURE ASSET SOLUTIONS

SERVICE CENTER REPAIRS

Experienced engineers and technicians on staff
at our full-service, in-house repair center

Instra

Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com

Contact us: (888) 88-SOURCE | [e-mail] | www.artisantg.com

SM

REMOTE INSPECTION

View

WE BUY USED EQUIPMENT

Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins

www.artisantg.com/WeBuyEquipment

LOOKING FOR MORE INFORMATION?

Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical

specications, manuals, and documentation