National Instruments NI 9425 User manual

NI-9425 Getting
Started
2022-07-06

Contents
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
NI-9425 with Spring Terminal Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
NI-9425 with DSUB Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
NI 9425 Pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting a Sourcing-Output Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
NI-9425 Connection Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
High-Vibration Application Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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NI-9425 Getting Started

Overview
This document explains how to connect to the NI-9425. In this document, the
NI-9425 with spring terminal and the NI-9425 with DSUB are referred to inclusively
as the NI-9425.
Note Before you begin, read the NI-9425 Safety, Environmental, and
Regulatory Information document on ni.com/manuals and complete the
soware and hardware installation procedures in your chassis
documentation.
Note The guidelines in this document are specific to the NI-9425. The
other components in the system might not meet the same safety ratings.
Refer to the documentation for each component in the system to
determine the safety and EMC ratings for the entire system.
Safety Guidelines
Caution Observe all instructions and cautions in the user documentation.
Using the product in a manner not specified can damage the product and
compromise the built-in safety protection.
Attention Suivez toutes les instructions et respectez toutes les mises
en garde de la documentation d'utilisation. L'utilisation du produit de
toute autre façon que celle spécifiée risque de l'endommager et de
compromettre la protection de sécurité intégrée.
© National Instruments 3
NI-9425 Getting Started

Safety Guidelines for Hazardous Voltages
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 Ensure 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
V DC), you must ensure that devices and circuits connected to the module
are properly insulated from human contact.
NI-9425 with Spring Terminal Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Up to 8 channels simultaneously ±60 V maximum
All channels simultaneously ±30 V maximum
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 250 V RMS, Measurement Category II
Withstand up to 5,000 m 3,000 V RMS, verified by a 5 s dielectric withstand test
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NI-9425 Getting Started

Caution Do not connect the NI 9425 with spring terminal to signals or use
for measurements within Measurement Categories III or IV.
NI-9425 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-channel
Up to 8 channels simultaneously ±60 V maximum
All channels simultaneously ±30 V maximum
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 V DC, Measurement Category I
Withstand up to 2,000 m 1,000 V RMS, verified by a 5 s dielectric withstand test
Withstand up to 5,000 m 500 V RMS, verified by a 5 s dielectric withstand test
Caution Do not connect the NI 9425 with DSUB to signals or use for
measurements within Measurement Categories II, III, or IV.
Note Measurement Categories CAT I and CAT O are equivalent. These test
and measurement circuits are for other circuits not intended for direct
connection to the MAINS building installations of Measurement Categories
CAT II, CAT III, or CAT IV.
Safety Guidelines for Hazardous Locations
The NI-9425 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 Gc and Ex nA IIC T4 Gc hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
© National Instruments 5
NI-9425 Getting Started

NI-9425 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 o or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched o or
the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Class I,
Division 2, or Zone 2.
Caution The system must be installed in an enclosure certified for the
intended hazardous (classified) location, having a tool secured cover/door,
where a minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in Europe and
Internationally
The NI 9425 with spring terminal has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 12 ATEX 1202658X and is IECEx UL 14.0089X certified. The NI 9425 with
DSUB has been evaluated as Ex nA IIC T4 Gc equipment under DEMKO 03 ATEX
0324020X and is IECEx UL 14.0089X certified. Each NI 9425 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 9425 in Gas Group IIC hazardous locations, you
must use the device in an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
Caution Transient protection shall be provided that is set at a level not
exceeding 140% of the peak rated voltage value of 85 V at the supply
terminals to the equipment.
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NI-9425 Getting Started

Caution The system shall only be used in an area of not more than
Pollution Degree 2, as defined in IEC/EN 60664-1.
Caution The system shall be mounted in an ATEX/IECEx-certified
enclosure with a minimum ingress protection rating of at least IP54 as
defined in IEC/EN 60079-15.
Caution The enclosure must have a door or cover accessible only by the
use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits
for electromagnetic compatibility (EMC) stated in the product specifications. These
requirements and limits provide reasonable protection against harmful interference
when the product is operated in the intended operational electromagnetic
environment.
This product is intended for use in industrial locations. However, harmful
interference may occur in some installations, when the product is connected to a
peripheral device or test object, or if the product is used in residential or
commercial areas. To minimize interference with radio and television reception and
prevent 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.
Special Conditions for Marine Applications
Some products are approved for marine (shipboard) applications. To verify marine
approval certification for a product, visit ni.com/product-certifications, search by
model number, and click the appropriate link.
© National Instruments 7
NI-9425 Getting Started

Notice 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.
Preparing the Environment
Ensure that the environment in which you are using the NI 9425 meets the following
specifications.
Operating temperature (IEC 60068-2-1, IEC 60068-2-2) -40 °C to 70 °C
Operating humidity (IEC 60068-2-30) 10% RH to 90% RH, noncondensing
Pollution Degree 2
Maximum altitude 5,000 m
Indoor use only.
Note Refer to the NI-9425 Specifications on ni.com/manuals for
complete specifications.
NI 9425 Pinout
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
DI0
DI1
DI3
DI5
DI7
DI9
DI11
DI13
DI15
COM
DI2
DI4
DI6
DI8
DI10
DI12
DI14
COM
DI17
DI16
DI18
DI20
DI22
DI24
DI26
DI28
DI30
NC
DI19
DI21
DI23
DI25
DI27
DI29
DI31
NC
DI16
DI17
DI18
DI19
DI20
DI21
DI22
DI23
COM
COM
DI24
DI25
DI26
DI27
DI28
DI29
DI30
DI31
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DO7
COM
COM
DI8
DI9
DI10
DI11
DI12
DI13
DI14
DI15
NC
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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NI-9425 Getting Started

Signal Description
COM Common reference connection to isolated ground
DI Digital input signal connection
NC No connection
Table 1. Signal Descriptions
Connecting a Sourcing-Output Device
You can connect 2-, 3-, and 4-wire sourcing-output devices to the NI-9425.
NI 9425
+
_COM
DI
Sourcing-Output
Device
External
Power
Supply
The NI-9425 channel registers as ON when the sourcing-output device applies a
voltage or drives a current that is in the input ON range to DI. The channel registers
as OFF when the device applies a voltage or drives a current that is in the input OFF
range to DI. If no device is connected to DI, the channel registers as OFF.
NI-9425 Connection Guidelines
■ Make sure that devices you connect to the NI-9425 are compatible with the
module specifications.
■ You must use 2-wire ferrules to create a secure connection when connecting
more than one wire to a single terminal on the NI-9425 with spring terminal.
■ For the NI-9425 with spring terminal, push the wire into the terminal when
using a solid wire or a stranded wire with a ferrule.
■ For the NI-9425 with spring terminal, open the terminal by pressing the
push button when using stranded wire without a ferrule.
© National Instruments 9
NI-9425 Getting Started

■ For CAT II measurements, you must use a power supply with isolated DC
outputs if you are using an external power supply.
High-Vibration Application Connections
If your application is subject to high vibration, NI recommends that you use the
cRIO-9940 backshell kit to protect connections to the NI-9425 with spring terminal.
Where to Go Next
Located at ni.com/manuals Installs with the software
CompactRIO NI CompactDAQ
RELATED INFORMATION
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& Resources
ni.com/info a cseriesdoc
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NI-9425 Getting Started