NI NI-9237 Manuel utilisateur

NI-9237 Getting

Started

2022-07-06

Contents

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Connecting the NI-9237. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Signal Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Connecting a Full Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Connecting a Half Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Connecting a Quarter Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Connecting TEDS Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

ni.com

NI-9237 Getting Started

Overview

This document explains how to connect to the NI-9237. In this document, the

NI-9237 with RJ-50 and the NI-9237 with DSUB are referred to inclusively as the

NI-9237.

Note Before you begin, read the NI-9237 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-9237. 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.

Safety Voltages

Connect only voltages that are within the following limits.

Between any two pins ±30 V maximum

NI-9237 Getting Started

Isolation, channel-to-channel None

Isolation, channel-to-earth ground

Up to 3,000 m

Continuous 60 VDC, Measurement Category I

Withstand 1,000 Vrms, verified by a 5 s dielectric withstand test

Up to 5,000 m

Continuous 60 VDC, Measurement Category I

Withstand 860 Vrms, verified by a 5 s dielectric withstand test

Safety Guidelines for Hazardous Locations

The NI-9237 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-9237 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.

ni.com

NI-9237 Getting Started

Caution For Division 2 and Zone 2 applications, connected signals must

be within the following limits.

Capacitance 0.2 μF maximum

Inductance 80 mH maximum

Special Conditions for Hazardous Locations Use in Europe and

Internationally

The NI-9237 has been evaluated as Ex nA IIC T4 Gc equipment under

DEMKO 07ATEX 0626664X and is IECEx UL 14.0089X certified. Each NI-9237 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-9237 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.

NI-9237 Getting Started

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.

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-9237 meets the following

specifications.

Operating temperature (IEC 60068-2-1, IEC 60068-2-2) -40 °C to 70 °C

ni.com

NI-9237 Getting Started

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-9237 Specifications on ni.com/manuals for

complete specifications.

Connecting the NI-9237

The NI-9237 provides connections for four half or full bridges, and an external

excitation voltage source.

Figure 1. NI-9237 Pinout

AI+

AI–

RS+

RS–

EX+

EX–

T+

T–

Ch0 – Ch3

EX+ EX+

EX– EX–

Ch 0

Ch 1

Ch 2

Ch 3

Caution Do not use RJ-45 cables with the NI-9237 with RJ-50. RJ-45

cables damage the RJ-50 connector, permanently disabling the shunt

calibration, regardless of which connector you use.

Signal Descriptions

Signal Name Description

AI+ Positive analog input signal connection

AI- Negative analog input signal connection

RS+ Positive remote sensing connection

NI-9237 Getting Started

Signal Name Description

RS- Negative remote sensing connection

EX+ Positive sensor excitation connection

EX- Negative sensor excitation connection

T+ TEDS data connection

T- TEDS return connection

SC Shunt calibration connection

Table 1. NI-9237 Signal Descriptions

Connecting a Full Bridge

You can connect a full bridge to the NI-9237.

Figure 2. Connecting a Full Bridge to the NI-9237

You also can connect floating signals to the NI-9237. If you connect floating signals

to the NI-9237, NI recommends connecting the EX- signal to the earth ground or

shield for better noise rejection.

Connecting a Half Bridge

You can connect a half bridge to the NI-9237.

Figure 3. Connecting a Half Bridge to the NI-9237

You also can connect floating signals to the NI-9237. If you connect floating signals

to the NI-9237, NI recommends connecting the EX- signal to the earth ground or

shield for better noise rejection.

ni.com

NI-9237 Getting Started

Bridge Calibration

When you insert or remove a new sensor from the NI-9237, slight changes in the

excitation voltages can cause a mismatch between the internal half-bridge

completion resistors and the half-bridge sensors, which results in a change in the

measurement osets. NI recommends performing bridge calibrations of quarter- or

half-bridge sensors aer connecting all sensors to the NI-9237 and aer removing or

attaching any additional sensor. For more information about changes in voltage

osets in the NI-9237, visit ni.com/info and enter the Info Code rdw9237.

Connecting a Quarter Bridge

You can connect a quarter bridge to the NI-9237 by adding a resistor externally to

create a half bridge.

Figure 4. Connecting a Quarter Bridge to the NI-9237

You also can use a quarter bridge with the NI-9237 with RJ-50 if you use the NI 9944

or NI 9945 Quarter Bridge Completion Accessory.

Connecting TEDS Sensors

You can connect TEDs sensors to the NI-9237.

Figure 5. Connecting TEDS Sensors to the NI-9237

Ensure that neither the TEDS data (T+) nor the TEDS return (T-) signal is tied in

common to any AI signals on the NI-9237. The NI-9237 connects all the T- signals

together internally. The NI-9237 with DSUB has only three T- pins. To connect four

TEDS sensors to the NI-9237 with DSUB, wire the TEDS return signals of two of the

sensors to one of the T- pins.

NI-9237 Getting Started

Where to Go Next

NI Services

Visit ni.com/support to find support resources including documentation,

downloads, and troubleshooting and application development self-help such as

tutorials and examples.

Visit ni.com/services to learn about NI service oerings such as calibration options,

repair, and replacement.

Visit ni.com/register to register your NI product. Product registration facilitates

technical support and ensures that you receive important information updates from

NI.

NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX,

78759-3504, USA.

ni.com

NI-9237 Getting Started

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