OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9217
4-Channel, 24-Bit, 100Ω RTD Analog Input Module
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Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk or 60 VDC to earth ground.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
Caution Make sure that devices and circuits connected to
the module are properly insulated from human contact.
Caution When module terminals are hazardous voltage
LIVE (>42.4 Vpk/60 VDC), you must ensure that devices
and circuits connected to the module are properly
insulated from human contact. You must use the NI 9939
connector backshell kit to ensure that the terminals are
not accessible.
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Figure 1 shows the NI 9939 connector backshell.
Figure 1. NI 9939 Connector Backshell
Safety Guidelines for Hazardous Locations
The NI 9217 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4, and
Ex nC IIC T4 hazardous locations; and nonhazardous locations
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only. Follow these guidelines if you are installing the NI 9217 in a
potentially explosive environment. Not following these guidelines
may result in serious injury or death.
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system
in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
Caution For Zone 2 applications, connected signals must
be within the following limit:
Capacitance..........................0.2 μF max
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Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked
II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9217 in Gas Group IIC hazardous
locations or in ambient temperatures of –40 °C ≤ Ta ≤ 70 °C, you
must use the device in an NI chassis that has been evaluated as
EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, visit
ni.com/certification and search for the LR certificate, or
look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission requirements
for marine applications, use shielded cables and install
the system in a metal enclosure. Suppression ferrites
must be installed on power supply inputs near power
entries to modules and controllers. Power supply and
module cables must be separated on opposite sides of the
enclosure and must enter and exit through opposing
enclosure walls.
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Connecting the NI 9217
The NI 9217 has a 16-terminal, detachable screw-terminal
connector that provides connections for four RTD channels.
EX0
0
1
RTD0+
RTD0–
COM
2
3
EX1
4
RTD1+
RTD1–
COM
5
6
7
EX2
8
RTD2+
RTD2–
COM
9
10
11
12
13
14
15
EX3
RTD3+
RTD3–
COM
Figure 2. NI 9217 Terminal Assignments
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You can connect any combination of 3-wire or 4-wire RTDs to
the NI 9217. Each NI 9217 channel contains circuitry that
automatically detects the type of RTD connected to the channel.
The NI 9217 scans all four input channels and automatically
configures each channel for the appropriate mode. In 4-wire mode,
the EX terminal is a 1 mA current source. In 3-wire mode, the
RTD+ terminal is a 1 mA current source. The NI 9217
compensates for the error that lead resistance causes in 3-wire
mode. Refer to Figure 3 for an example of the input circuitry for
one channel of the NI 9217 in 4-wire mode.
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 9217.
The NI 9217 channels share a common ground that is isolated from
other modules in the system. Each channel is filtered and then
sampled by a 24-bit analog-to-digital converter (ADC).
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Excitation
Current
4-Wire EX
RTD+
Filtered
Amplifier
ADC
3-wire & 4-wire
Detection &
Compensation
RTD–
COM
NI 9217
Figure 3. Input Circuitry for One Channel of the NI 9217 in 4-Wire Mode
Each channel has one terminal, RTD+, to which you connect the
positive lead of the RTD signal and one terminal, RTD–, to which
you connect the negative lead of the RTD signal. Each channel also
has a common terminal, COM, and an excitation current source
terminal, EX. You must connect the COM terminal to RTD–. All
four COM terminals are internally connected to the isolated ground
reference of the module. If you are using shielded wiring, connect
one end of the shield to the COM terminal. Refer to Figure 4 for an
illustration of how to connect an RTD to the NI 9217.
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If you are using a 4-wire RTD, connect EX to the positive lead of
the RTD. If you are using a 3-wire RTD, do not connect the RTD
to the EX terminal. For the best measurement results when using
the NI 9217 with a 3-wire RTD, use equal-length wires between the
RTD+ terminal and the RTD and between the COM terminal and
the RTD. Also, keep the lead resistance within 5% of the nominal
RTD value. The NI 9217 accuracy specifications account for this
lead error. Refer to the Specifications section for more information
about accuracy.
4-Wire EX
RTD+
RTD
RTD–
COM
NI 9217
Figure 4. Connecting an RTD to the NI 9217
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Wiring for High-Vibration Applications
If an application is subject to high vibration, National Instruments
recommends that you either use ferrules to terminate wires to the
detachable screw-terminal connector or use the NI 9939 backshell
kit to protect the connections. Refer to Figure 5 for an illustration
of using ferrules. Refer to Figure 1 for an illustration of the
NI 9939 connector backshell.
Figure 5. 16-Terminal Detachable Screw-Terminal Connector with Ferrule
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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.
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Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. All voltages are relative to COM unless
otherwise noted.
All specifications given in °C are specific to 100 Ω platinum RTDs.
Input Characteristics
Number of channels..........................4 analog input channels
ADC resolution.................................24 bits
Type of ADC.....................................Delta-sigma
Sampling mode.................................Scanned
Measurement range
Temperature................................–200 to 850 °C
Resistance...................................0 to 400 Ω
Common-mode range
COM-to-earth ground................. 250 Vrms
Channel-to-COM........................50 mV
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Conversion time
High-resolution mode.................200 ms per channel,
800 ms total for all channels
High-speed mode........................2.5 ms per channel,
10 ms total for all channels
Temperature accuracy (including noise)1, 4-wire mode
Maximum
(–40 to 70 °C)
Measured Value
–200 to 150 °C
150 to 850 °C
Typical (25 °C)
0.15 °C
0.35 °C
0.20 °C
1.0 °C
Temperature accuracy (including noise)1, 3-wire mode
Maximum
(–40 to 70 °C)
Measured Value
–200 to 150 °C
150 to 850 °C
Typical (25 °C)
0.20 °C
0.50 °C
0.30 °C
1.0 °C
1
For high-speed mode, add a 0.1 °C error.
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Noise
High-resolution mode.................0.003 °C
High-speed mode........................0.02 °C
Excitation current..............................1 mA per channel
Noise rejection
Normal mode (50/60 Hz)
High-resolution mode ..........85 dB min
High-speed mode .................None
Common-mode rejection, channel to earth ground (50/60 Hz)
High-resolution mode ..........170 dB min
High-speed mode .................155 dB
Input bandwidth
(high-resolution mode) .....................3.3 Hz
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High-resolution filter response1,2
–0
–20
–40
–60
–80
–100
–120
–140
0
60
120
180
240
Differential Input
Signal Frequency (Hz)
1
2
This image is provided courtesy of Linear Technology Corp.
High-speed filter response has the same characteristics as the high-resolution filter
response except that the first notch is at 14 kHz.
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Overvoltage protection ..................... 30 V between inputs
MTBF ...............................................891,597 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.
Power Requirements
Power consumption from chassis
Active mode ...............................350 mW max
Sleep mode .................................1 mW max
Thermal dissipation (at 70 °C)
Active mode ...............................350 mW max
Sleep mode .................................1 mW max
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Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Screw-terminal wiring ......................16 to 28 AWG copper
conductor wire with 7 mm
(0.28 in.) of insulation
stripped from the end
Torque for screw terminals ...............0.22 to 0.25 N · m
(1.95 to 2.21 lb · in.)
Ferrules .............................................0.25 mm2 to 0.5 mm2
Weight...............................................142 g (5.0 oz)
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Safety
Maximum Voltage1
Connect only voltages that are within the following limits.
All terminals-to-COM......................... 30 V
Isolation Voltages
Channel-to-channel...........................None
Channel-to-earth ground
Continuous .................................250 Vrms, Measurement
Category II
Withstand....................................2,300 Vrms, verified by a 5 s
dielectric withstand test
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
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.
1 The maximum voltage that can be applied between any channel or Vsup terminal and
a COM terminal without damaging the module or other devices.
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Caution Do not connect the NI 9217 to signals or use for
measurements within Measurement Categories III or IV.
Safety Standards
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
•
•
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 visit ni.com/certification, search
by module number or product line, and click the
appropriate link in the Certification column.
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Hazardous Locations
U.S. (UL) ..........................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Canada (C-UL) .................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
Europe (DEMKO).............................EEx nC IIC T4
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 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C
Ingress protection..............................IP 40
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Operating humidity
(IEC 60068-2-56)..............................10 to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-56)..............................5 to 95% RH,
noncondensing
Maximum altitude.............................2,000 m
Pollution Degree (IEC 60664)..........2
Shock and Vibration
To meet these specifications, you must panel mount the system and
either affix ferrules to the ends of the terminal wires or use the
NI 9939 backshell kit to protect the connections.
Operating vibration
Random (IEC 60068-2-64).........5 grms, 10 to 500 Hz
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz
Operating shock
(IEC 60068-2-27)..............................30 g, 11 ms half sine,
50 g, 3 ms half sine,
18 shocks at 6 orientations
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Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement,
control, and laboratory use:
•
•
•
EN 61326 EMC requirements; Industrial Immunity
EN 55011 Emissions; Group 1, Class A
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note For EMC compliance, operate this device with
shielded cabling.
CE Compliance
This product meets the essential requirements of applicable
European directives, as amended for CE markings, as follows:
•
•
2006/95/EC; Low-Voltage Directive (safety)
2004/108/EC; Electromagnetic Compatibility Directive
(EMC)
Note Refer to the Declaration of Conformity (DoC) for
this product for any additional regulatory compliance
information. To obtain the DoC for this product, visit
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ni.com/certification, search by module number or
product line, and click the appropriate link in the
Certification column.
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also 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 their life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit ni.com/
environment/weee.htm.
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about China RoHS compliance, go to
environment/rohs_china
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ni.com/
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Calibration
You can obtain the calibration certificate and information about
calibration services for the NI 9217 at ni.com/calibration.
Calibration interval ...........................1 year
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Where to Go for Support
The National Instruments Web site is your complete resource
for technical support. At ni.com/support you have access to
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 ni.com/support
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,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
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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 3390150,
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
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