National Instruments NI 9235 User manual

GETTING STARTED GUIDE

NI 9235

10 kS/s/channel, 120 Ω Quarter-Bridge Strain

Gage, 8-Channel C Series Strain/Bridge Input

Module

This document explains how to connect to the NI 9235.

Note Before you begin, complete the software and

hardware installation procedures in your chassis

documentation.

Note The guidelines in this document are specific to

the NI 9235. 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 9235 only as described in this document.

Caution This icon denotes a caution, which advises

you to consult documentation where this symbol is

marked.

Caution Do not operate the NI 9235 in a manner not

specified in this document. Product misuse can result in

a hazard. You can compromise the safety protection

2| ni.com | NI 9235 Getting Started Guide

built into the product if the product is damaged in any

way. If the product is damaged, return it to NI for

repair.

Safety Voltages

Connect only voltages that are within the following limits:

Between any two terminals ±30 V maximum

Isolation

Channel-to-channel None

Channel-to-earth ground

Continuous 60 V DC,

Measurement Catergory I

Withstand 1,000 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

NI 9235 Getting Started Guide | © National Instruments | 3

equipment, limited-energy parts of equipment, circuits powered

by regulated low-voltage sources, and electronics.

Caution Do not connect the NI 9235 to signals or use

for measurements within Measurement Categories II,

III, or IV.

Safety Guidelines for Hazardous Locations

The NI 9235 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 9235 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.

4| ni.com | NI 9235 Getting Started Guide

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 9235 has been evaluated as Ex nA IIC T4 Gc equipment

under DEMKO 07 ATEX 0626664X and is IECEx UL 14.0089X

certified. Each NI 9235 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 9235 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.

NI 9235 Getting Started Guide | © National Instruments | 5

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

6| ni.com | NI 9235 Getting Started Guide

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 To ensure the specified EMC performance,

operate this product only with shielded cables and

accessories.

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

NI 9235 Getting Started Guide | © National Instruments | 7

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 9235

meets the following specifications.

Operating temperature

(IEC 60068-2-1, IEC 60068-2-2)

-40 °C to 70 °C

Operating humidity

(IEC 60068-2-78)

10% RH to 90% RH,

noncondensing

Pollution Degree 2

Maximum altitude 5,000 m

Indoor use only.

Note Refer to the device datasheet on ni.com/manuals

for complete specifications.

8| ni.com | NI 9235 Getting Started Guide

NI 9235 Pinout

EXC1

AI1

RC1

EXC3

AI3

RC3

EXC5

AI5

RC5

EXC7

AI7

RC7

EXC0

AI0

RC0

EXC2

AI2

RC2

EXC4

AI4

RC4

EXC6

AI6

RC6

NI 9235 Getting Started Guide | © National Instruments | 9

Table 1. Signal Descriptions

Signal Description

AI Analog input signal connection

EXC Excitation source connection

RC Quarter-bridge completion connection

NI 9235 Connection Guidelines

• Make sure that devices you connect to the NI 9235 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 9235.

• Push the wire into the terminal when using a solid wire or a

stranded wire with a ferrule.

• Open the terminal by pressing the push button when using

stranded wire without a ferrule.

10 | ni.com | NI 9235 Getting Started Guide

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