National Instruments NI 9217 User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9217
4-Channel, 24-Bit, 100ΩRTD Analog Input Module
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NI 9217 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9217
and includes specifications and terminal assignments for the
NI 9217. Visit ni.com/info and enter rdsoftwareversion to
determine which software youneed for the modules youare using.
For information about installing, configuring, and programming
the system, refer to the system documentation. Visit ni.com/info
and enter cseriesdoc for information about C Series
documentation.
Note The safety guidelines and specifications in this
document are specific to the NI 9217. The other
components in the system might not meet the same safety
ratings and specifications. Refer to the documentation for
each component in the system to determine the safety
ratings and specifications for the entire system. Visit
ni.com/info and enter cseriesdoc for information
about C Series documentation.
Safety Guidelines
Operate the NI 9217 only as described in these operating
instructions.

© National Instruments Corp. 3 NI 9217 Operating Instructions and Specifications
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), youmust ensure that devices
and circuits connected to the module are properly
insulated from human contact. Youmust use the NI 9939
connector backshell kit to ensure that the terminals are
not accessible.

NI 9217 Operating Instructions and Specifications 4 ni.com
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

© National Instruments Corp. 5 NI 9217 Operating Instructions and Specifications
only. Follow these guidelines if youare 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

NI 9217 Operating Instructions and Specifications 6 ni.com
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 youare 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.

© National Instruments Corp. 7 NI 9217 Operating Instructions and Specifications
Connecting the NI 9217
The NI 9217 has a 16-terminal, detachable screw-terminal
connector that provides connections for four RTD channels.
Figure 2. NI 9217 Terminal Assignments
EX0
RTD0+
RTD0–
COM
EX1
RTD1+
RTD1–
COM
EX2
RTD2+
RTD2–
COM
EX3
RTD3+
RTD3–
COM
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

NI 9217 Operating Instructions and Specifications 8 ni.com
Yo ucan 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 Youmust 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).

© National Instruments Corp. 9 NI 9217 Operating Instructions and Specifications
Figure 3. Input Circuitry for One Channel of the NI 9217 in 4-Wire Mode
Each channel has one terminal, RTD+, to which youconnect the
positive lead of the RTD signal and one terminal, RTD–, to which
youconnect the negative lead of the RTD signal. Each channel also
has a common terminal, COM, and an excitation current source
terminal, EX. Youmust connect the COM terminal to RTD–. All
four COM terminals are internally connected to the isolated ground
reference of the module. If youare 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.
NI 9217
ADC
4-Wire EX
COM
RTD+
RTD–
Excitation
Current
Filtered
Amplifier
3-wire & 4-wire
Detection &
Compensation

NI 9217 Operating Instructions and Specifications 10 ni.com
If youare using a 4-wire RTD, connect EX to the positive lead of
the RTD. If youare 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.
Figure 4. Connecting an RTD to the NI 9217
NI 9217
4-Wire EX
RTD+
RTD–
COM
RTD

© National Instruments Corp. 11 NI 9217 Operating Instructions and Specifications
Wiring for High-Vibration Applications
If an application is subject to high vibration, National Instruments
recommends that youeither 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

NI 9217 Operating Instructions and Specifications 12 ni.com
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, youcannot
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. 13 NI 9217 Operating Instructions and Specifications
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 Ωplatinum 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

NI 9217 Operating Instructions and Specifications 14 ni.com
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
Temperature accuracy (including noise)1, 3-wire mode
1 For high-speed mode, add a 0.1 °C error.
Measured Value Typical (25 °C)
Maximum
(–40 to 70 °C)
–200 to 150 °C 0.15 °C 0.35 °C
150 to 850 °C 0.20 °C 1.0 °C
Measured Value Typical (25 °C)
Maximum
(–40 to 70 °C)
–200 to 150 °C 0.20 °C 0.50 °C
150 to 850 °C 0.30 °C 1.0 °C

© National Instruments Corp. 15 NI 9217 Operating Instructions and Specifications
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

NI 9217 Operating Instructions and Specifications 16 ni.com
High-resolution filter response1,2
1 This image is provided courtesy of Linear Technology Corp.
2 High-speed filter response has the same characteristics as the high-resolution filter
response except that the first notch is at 14 kHz.
–20
–0
–40
–60
–80
–100
–120
–140
0 60 120
Differential Input
Signal Frequency (Hz)
Normal Mode Rejection (dB)
180 240

© National Instruments Corp. 17 NI 9217 Operating Instructions and Specifications
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

NI 9217 Operating Instructions and Specifications 18 ni.com
Physical Characteristics
If youneed 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
(1.95to2.21lb·in.)
Ferrules ............................................. 0.25 mm2to 0.5 mm2
Weight............................................... 142 g (5.0 oz)

© National Instruments Corp. 19 NI 9217 Operating Instructions and Specifications
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 Vsupterminal and
a COM terminal without damaging the module or other devices.

NI 9217 Operating Instructions and Specifications 20 ni.com
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.