National Instruments NI 9217 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9217

4-Channel, 24-Bit, 100ΩRTD Analog Input Module

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NI 9217 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9217

and includes specifications and terminal assignments for the

NI 9217. 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.

Note The safety guidelines and specifications in this

document are specific to the NI 9217. 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.

Safety Guidelines

Operate the NI 9217 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.

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 9939

connector backshell kit to ensure that the terminals are

not accessible.

NI 9217 Operating Instructions and Specifications 4 ni.com

Figure 1 shows the NI 9939 connector backshell.

Figure 1. NI 9939 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9217 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4, and

Ex nC IIC T4 hazardous locations; and nonhazardous locations

only. Follow these guidelines if youare installing the NI 9217 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.

Caution For 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 Zone 2 applications, connected signals must

be within the following limit:

Capacitance .......................... 0.2 μF max

NI 9217 Operating Instructions and Specifications 6 ni.com

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as EEx nC IIC T4 equipment

under DEMKO Certificate No. 03 ATEX 0324020X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations. If youare using the NI 9217 in Gas Group IIC hazardous

locations or in ambient temperatures of –40 °C ≤Ta ≤70 °C, you

must use the device in an NI chassis that has been evaluated as

EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.

Special Conditions for Marine Applications

Some modules are Lloyd’s Register (LR) Type Approved for

marine applications. To verify Lloyd’s Register certification, visit

ni.com/certification and search for the LR certificate, or

look for the Lloyd’s Register mark on the module.

Caution To meet radio frequency emission requirements

for marine applications, use shielded cables and install

the system in a metal enclosure. Suppression ferrites

must be installed on power supply inputs near power

entries to modules and controllers. Power supply and

module cables must be separated on opposite sides of the

enclosure and must enter and exit through opposing

enclosure walls.

Connecting the NI 9217

The NI 9217 has a 16-terminal, detachable screw-terminal

connector that provides connections for four RTD channels.

Figure 2. NI 9217 Terminal Assignments

EX0

RTD0+

RTD0–

COM

EX1

RTD1+

RTD1–

COM

EX2

RTD2+

RTD2–

COM

EX3

RTD3+

RTD3–

COM

NI 9217 Operating Instructions and Specifications 8 ni.com

Yo ucan connect any combination of 3-wire or 4-wire RTDs to

the NI 9217. Each NI 9217 channel contains circuitry that

automatically detects the type of RTD connected to the channel.

The NI 9217 scans all four input channels and automatically

configures each channel for the appropriate mode. In 4-wire mode,

the EX terminal is a 1 mA current source. In 3-wire mode, the

RTD+ terminal is a 1 mA current source. The NI 9217

compensates for the error that lead resistance causes in 3-wire

mode. Refer to Figure 3 for an example of the input circuitry for

one channel of the NI 9217 in 4-wire mode.

Note Youmust use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9217.

The NI 9217 channels share a common ground that is isolated from

other modules in the system. Each channel is filtered and then

sampled by a 24-bit analog-to-digital converter (ADC).

Figure 3. Input Circuitry for One Channel of the NI 9217 in 4-Wire Mode

Each channel has one terminal, RTD+, to which youconnect the

positive lead of the RTD signal and one terminal, RTD–, to which

youconnect the negative lead of the RTD signal. Each channel also

has a common terminal, COM, and an excitation current source

terminal, EX. Youmust connect the COM terminal to RTD–. All

four COM terminals are internally connected to the isolated ground

reference of the module. If youare using shielded wiring, connect

one end of the shield to the COM terminal. Refer to Figure 4 for an

illustration of how to connect an RTD to the NI 9217.

NI 9217

ADC

4-Wire EX

COM

RTD+

RTD–

Excitation

Current

Filtered

Amplifier

3-wire & 4-wire

Detection &

Compensation

NI 9217 Operating Instructions and Specifications 10 ni.com

If youare using a 4-wire RTD, connect EX to the positive lead of

the RTD. If youare using a 3-wire RTD, do not connect the RTD

to the EX terminal. For the best measurement results when using

the NI 9217 with a 3-wire RTD, use equal-length wires between the

RTD+ terminal and the RTD and between the COM terminal and

the RTD. Also, keep the lead resistance within 5% of the nominal

RTD value. The NI 9217 accuracy specifications account for this

lead error. Refer to the Specifications section for more information

about accuracy.

Figure 4. Connecting an RTD to the NI 9217

NI 9217

4-Wire EX

RTD+

RTD–

COM

RTD

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