National Instruments NI 9214 User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9214 with NI TB-9214
16-Channel Thermocouple Input Module with
Terminal Block
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NI 9214 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9214 in
conjunction with an NI TB-9214 terminal block and includes
specifications for the NI 9214 and terminal assignments for the
NI TB-9214. 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.
Visit ni.com/info and enter compatibility for information
about chassis and carrier compatibility for the modules youare
using.
Note The safety guidelines and specifications in this
document are specific to the NI 9214 used in conjunction
with an NI TB-9214. 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.
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© National Instruments Corp. 3 NI 9214 Operating Instructions and Specifications
Safety Guidelines
Operate the NI 9214 only as described in these operating
instructions.
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.
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NI 9214 Operating Instructions and Specifications 4 ni.com
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 TB-9214 terminal block included with the NI 9214
to ensure that the terminals are not accessible.
Figure 1 shows the NI TB-9214 terminal block.
Figure 1. NI TB-9214 Terminal Block
Note The NI TB-9214 contains a plastic insert to prevent
accidental wire contact with the metal enclosure.
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© National Instruments Corp. 5 NI 9214 Operating Instructions and Specifications
Safety Guidelines for Hazardous Locations
The NI 9214 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and
Ex nA IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if youare installing the NI 9214 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 and Zone 2.
Caution For Division 2 and 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 Division 2 and Zone 2 applications,
connected signals must be within the following limit:
Capacitance .......................... 0.2 F max
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NI 9214 Operating Instructions and Specifications 6 ni.com
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment
under DEMKO Certificate No. 07 ATEX 0626664X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations, in ambient temperatures of –40 °C Ta 70 °C. If you
are using the NI 9214 in Gas Group IIC hazardous locations, you
must use the device in an NI chassis that has been evaluated as
Ex nC IIC T4, EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4
equipment.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory
requirements and limits for electromagnetic compatibility (EMC)
as stated in the product specifications. These requirements and
limits are designed to provide reasonable protection against
harmful interference when the product is operated in its intended
operational electromagnetic environment.
This product is intended for use in industrial locations. There is no
guarantee that harmful interference will not occur in a particular
installation, when the product is connected to a test object, or if the
product is used in residential areas. To minimize the potential for
the product to cause interference to radio and television reception
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© National Instruments Corp. 7 NI 9214 Operating Instructions and Specifications
or to experience unacceptable performance degradation, install and
use this product in strict accordance with the instructions in the
product documentation.
Furthermore, any changes or modifications to the product not
expressly approved by National Instruments could void your
authority to operate it under your local regulatory rules.
Caution When operating this product, use shielded
cables and accessories.
Special Guidelines for Marine Applications
Some products are Lloyd’s Register (LR) Type Approved for
marine (shipboard) applications. To verify Lloyd’s Register
certification for a product, visit ni.com/certification and
search for the LR certificate, or look for the Lloyd’s Register mark
on the product label.
Caution In order to meet the EMC requirements for
marine applications, install the product in a shielded
enclosure with shielded and/or filtered power and
input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes
and cables to ensure that the desired EMC performance is
attained.
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NI 9214 Operating Instructions and Specifications 8 ni.com
Connecting the NI 9214
The NI TB-9214 provides connections for 16 thermocouple
channels on the NI 9214.
Figure 2. NI TB-9214 Terminal Reference
TC0+
TC0–
TC1+
TC1–
TC5+
TC5–
TC6+
TC6–
TC2+
TC4–
TC4+
TC3+
TC3–
TC2–
TC7+
TC9–
TC9+
TC8+
TC8–
TC7–
TC10+
TC12–
TC12+
TC11+
TC11–
TC10–
TC13+
TC15–
TC15+
TC14+
TC14–
TC13–
COM
COM
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© National Instruments Corp. 9 NI 9214 Operating Instructions and Specifications
Youcan connect thermocouple input signals to the NI 9214.
Connect the positive lead of the thermocouple to the TC+ terminal
and the negative lead of the thermocouple to the TC– terminal. If
youare unsure which of the thermocouple leads is positive and
which is negative, check the thermocouple documentation or the
thermocouple wire spool.
The NI 9214 also has two common terminals, COM, that are
internally connected to the isolated ground reference of the
module. A connection to COM is not necessary for most
applications. Specifically, leave COM unconnected for
configurations in which all thermocouples are floating, all
thermocouples are referenced to the same common-mode voltage,
or one thermocouple is referenced to a common-mode voltage and
all others are floating.
However, for configurations in which two or more thermocouples
are referenced to different common-mode voltages, connecting
COM according to the following guidelines improves
common-mode rejection performance. Connect COM to chassis
ground if the common-mode to chassis voltages are smaller than
±1.2 V. Otherwise, connect COM to a valid common-mode voltage
reference that is within ±1.2 V of the common-mode voltages of all
the thermocouple inputs.
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NI 9214 Operating Instructions and Specifications 10 ni.com
Connecting the Signals
To connect thermocouple wires to the NI TB-9214, complete the
following steps while referring to Figure 3.
1. Loosen the captive screws and remove the top cover.
2. Remove the foam pad from the NI TB-9214 opening.
3. Prepare the screw-terminal wire by stripping the outer
insulation and inner insulation. Refer to the Specifications
section for more information on screw-terminal wiring.
4. Insert the stripped end of the wire fully into the appropriate
terminal. Make sure no exposed wire extends past the screw
terminal.
5. Secure the connection by tightening the screw for the terminal.
Refer to the Specifications section for information on
screw-terminal torque.
6. Route the wire through the NI TB-9214 opening.
7. Remove slack in the NI TB-9214 wiring and secure the wires
by threading a zip tie through the two strain relief holes on the
NI TB-9214 opening.
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