NI 9425 Getting Started Guide

Introduction

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.

ℹ️ Note: Before you begin, complete the software and hardware installation procedures in your chassis documentation.

ℹ️ 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

Operate the NI 9425 only as described in this document.

⚠️ Caution: Do not operate the NI 9425 in a manner not specified in this document. Product misuse can result in a hazard. You can compromise the safety protection built into the product if the product is damaged in any way. If the product is damaged, return it to NI for repair.

Hazardous Voltage: This icon denotes a warning advising you to take precautions to avoid electrical shock. A hazardous voltage is a voltage greater than 42.4 Vpk voltage or 60 VDC to earth ground.

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the device, take the following precautions:

• ⚠️ Caution: Ensure that hazardous voltage wiring is performed only by qualified personnel adhering to local electrical standards.
• ⚠️ Caution: All wiring must be insulated for the highest voltage used.
• ⚠️ 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 VDC), 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.

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.

⚠️ 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.

Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system, referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.

⚠️ Caution: Do not connect the NI 9425 with DSUB to signals or use for measurements within Measurement Categories II, III, or IV.

ℹ️ 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 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 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, 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 to 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.
• ⚠️ 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 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.

⚠️ 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.

Preparing the Environment

Ensure that the environment in which you are using the NI 9425 meets the following specifications:

• Operating temperature: -40 °C to 70 °C (IEC 60068-2-1, IEC 60068-2-2)
• Operating humidity: 10% RH to 90% RH, noncondensing (IEC 60068-2-78)
• Pollution Degree: 2
• Maximum altitude: 5,000 m
• Indoor use only.

ℹ️ Note: Refer to the device datasheet on ni.com/manuals for complete specifications.

NI 9425 Pinout

The NI 9425 is available with two connector types: spring terminal and DSUB. The pinouts are described below.

DSUB Connector Pinout

Spring Terminal Connector Pinout

Signal Descriptions

Connecting a Sourcing-Output Device

You can connect 2-, 3-, and 4-wire sourcing-output devices to the NI 9425.

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.
• 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 NI 9940 backshell kit to protect connections to the NI 9425 with spring terminal.

Where to Go Next

Explore these resources for further information:

• CompactRIO
• CompactDAQ
• NI 9425 Datasheet: Located at ni.com/manuals
• NI-RIO Help
• LabVIEW FPGA Help
• NI-DAQmx Help
• LabVIEW Help
• C Series Documentation & Resources: Visit ni.com/info cseriesdoc
• Services: Visit ni.com/services

Worldwide Support and Services

The NI website 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.

Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and other services.

Visit ni.com/register to register your NI product. Product registration facilitates technical support and ensures that you receive important information updates from NI.

A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European Communities using the manufacturer's declaration of conformity. This system affords the user protection for electromagnetic compatibility (EMC) and product safety. You can obtain the DoC for your product by visiting ni.com/certification. If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration.

Contact and Legal Information

NI corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. NI also has offices located around the world. For telephone support in the United States, create your service request at ni.com/support or dial 1 866 ASK MYNI (275 6964). For telephone support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information, support phone numbers, email addresses, and current events.

Information is subject to change without notice. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on NI trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering NI products/technology, refer to the appropriate location: HelpPatents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the NI global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.

[NI Logo] 2004--2017 National Instruments. All rights reserved. Document version: 373782J-01 April 28, 2017.