National Instruments NI 9211E Bedienungsanleitung

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9211E

4-Channel Thermocouple Input Module

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NI 9211E Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9211E

and includes dimensions, terminal assignments, and specifications for

the NI 9211E. Visit ni.com/info and enter rdsoftwareversion

to determine which software you need for the modules you are 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.

Caution National Instruments makes no electromagnetic

compatibility (EMC) or CE marking compliance claims

for the NI 9211E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9211E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be

present.

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NI 9211E Dimensions

The following figure shows the dimensions of the NI 9211E.

Figure 1. NI 9211E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

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NI 9211E Operating Instructions and Specifications 4 ni.com

Connecting the NI 9211E

The NI 9211E has a 10-terminal, detachable screw-terminal

connector that provides connections for 4 thermocouple channels.

Figure 2. NI 9211E Terminal Assignments

TC0+

TC0–

TC1+

TC1–

TC2+

TC2–

TC3+

TC3–

COM

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You can connect thermocouple input signals to the NI 9211E.

Connect the positive lead of the thermocouple to the TC+ terminal

and the negative lead of the thermocouple to the TC– terminal. If

you are unsure which of the thermocouple leads is positive and

which is negative, check the thermocouple documentation or the

thermocouple wire spool. If you are using shielded wiring, connect

one end of the shield to the COM terminal. The COM terminal is

internally connected to the isolated ground reference of the

module. Refer to Figure 3 for an illustration of a typical shielding

configuration.

Figure 3. Connecting a Shielded Thermocouple Input Signal to the NI 9211E

TC–

TC+

Shield

NI 9211E

COM

Thermocouple

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NI 9211E Operating Instructions and Specifications 6 ni.com

Note You must use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9211E.

The NI 9211E channels share a common ground isolated from

other modules in the system. Each channel passes through a filter

and then a 24-bit analog-to-digital converter (ADC) samples the

channel. Each channel also has an open thermocouple detection

(OTD) circuit, which consists of a current source between the

TC+and TC– terminals. If an open thermocouple is connected to

the channel, the current source forces a full-scale voltage across the

terminals. Refer to Figure 4 for an illustration of the circuitry for

one channel of the NI 9211E.

Each channel has a resistor that produces an input impedance

between the TC+and COM terminals and between the TC– and

COM terminals. The gain and offset errors resulting from the

source impedance of connected thermocouples are negligible for

most applications. Thermocouples with a higher lead resistance

can introduce more significant errors. Refer to the Specifications

section for more information about errors resulting from source

impedance.

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Figure 4. Input Circuitry for One Channel of the NI 9211E

TC+

TC–

COM

NI 9211E

Input

Impedance

Open

Thermocouple

Detection

Current

Filtered

Differential

Amplifier

Isolated

ADC

10 MΩ

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NI 9211E Operating Instructions and Specifications 8 ni.com

Temperature Measurement Accuracy

Considerations

Temperature measurement errors depend partly on the

thermocouple type, the accuracy of the thermocouple, the

temperature being measured, and the cold-junction temperature.

Refer to the Temperature Measurement Accuracy section in the

Specifications for the errors of each thermocouple type when

connected to the NI 9211E. The errors do not account for the

accuracy of the thermocouple itself.

For the best accuracy results, keep temperature gradients across

NI 9211E terminals to a minimum. Refer to the Minimizing

Thermal Gradients section for more information.

Cold-Junction Temperature Measurement Accuracy

Heat dissipated by adjacent modules or other nearby heat sources

can cause errors in thermocouple measurements by heating up the

NI 9211E terminals to a different temperature than the

cold-junction compensation sensor. The thermal gradient across

the terminals can cause the terminals of different channels to be at

different temperatures, in which case the resulting measurement

creates errors not only in absolute accuracy but also in the relative

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accuracy between channels. Refer to the Specifications section for

the cold-junction compensation accuracy specifications. Refer

to the Temperature Measurement Accuracy section in the

Specifications for the thermocouple accuracy specifications. Visit

ni.com/info and enter cjcdatascaling for more information

about isothermal errors and scaling CJC data.

Minimizing Thermal Gradients

Thermal gradients can be caused by changes in the ambient air

temperature near the front connector or by the thermocouple wire

if it conducts heat or cold directly to the terminal junctions. For the

best accuracy results, follow these guidelines for minimizing

thermal gradients:

• Use small-gauge thermocouple wire. Smaller wire transfers

less heat to or from the terminal junction.

• Run thermocouple wiring together near the screw-terminal

connector to keep the wires at the same temperature.

• Avoid running thermocouple wires near hot or cold objects.

• If you connect any extension wires to thermocouple wires,

use wires made of the same conductive material as the

thermocouple wires.

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