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
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