National Instruments NI 9211E User manual

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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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© National Instruments Corp. 3 NI 9211E Operating Instructions and Specifications
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–
NC
COM
0
1
2
3
4
5
6
7
8
9
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© National Instruments Corp. 5 NI 9211E Operating Instructions and Specifications
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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© National Instruments Corp. 7 NI 9211E Operating Instructions and Specifications
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
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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© National Instruments Corp. 9 NI 9211E Operating Instructions and Specifications
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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NI 9211E Operating Instructions and Specifications 10 ni.com
• Minimize adjacent heat sources and air flow across the
terminals.
• Keep the ambient temperature as stable as possible.
Using the Autozero Channel
The NI 9211E has an internal autozero channel for measuring the
offset error. If the ambient temperature of the NI 9211E is less than
15 °C or more than 35 °C, use this channel to read the offset error.
Subtract the offset error from the data read from each NI 9211E
thermocouple input channel. Refer to the software help for
information about using the autozero channel. Visit ni.com/info
and enter cseriesdoc for information about C Series
documentation.
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© National Instruments Corp. 11 NI 9211E Operating Instructions and Specifications
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.
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NI 9211E Operating Instructions and Specifications 12 ni.com
Specifications
The following specifications are typical for the range –40 to 85 °C
internal to any enclosures unless otherwise noted. Accuracy within
typical use can vary based on chassis, mounting parameters, other
modules present in the system, and installed accessories.
Input Characteristics
Number of channels.......................... 4 thermocouple channels,
1 internal autozero channel,
1 internal cold-junction
compensation channel
ADC resolution................................. 24 bits
Type of ADC..................................... Delta-Sigma
Sampling mode ................................. Scanned
Voltage measurement range.............. ±80 mV
Temperature measurement ranges .... Works over temperature
ranges defined by NIST
(J, K, T, E, N, B, R, S
thermocouple types)
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© National Instruments Corp. 13 NI 9211E Operating Instructions and Specifications
Conversion time ................................ 70 ms per channel;
420 ms total for all channels
including the autozero and
cold-junction channels
Common-mode voltage range
Channel-to-COM........................ ±1.5 V
COM-to-earth ground................. ±250 V
Common-mode rejection ratio (0 to 60 Hz)
Channel-to-COM........................ 95 dB
COM-to-earth ground................. >170 dB
Input bandwidth (–3 dB)................... 15 Hz
Noise rejection (at 50 and 60 Hz) ..... 85 dB min
Overvoltage protection ..................... ±30 V between any input
and COM
Differential input impedance ............ 20 MΩ
Input current...................................... 50 nA
Input noise ........................................ 1 μVrms
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NI 9211E Operating Instructions and Specifications 14 ni.com
Gain error.......................................... 0.05% max at 25 °C,
0.06% typ at –40 to 85 °C,
0.1% max at –40 to 85 °C
Offset error (with autozero
channel on)........................................ 15 μV typ, 20 μV max
Gain error from
source impedance.............................. Add 0.05 ppm per Ωwhen
source impedance >50 Ω
Offset error from
source impedance.............................. Add 0.05 μV typ, 0.07 μV
max per Ωwhen source
impedance >50 Ω
Cold-junction compensation sensor accuracy1
0 to 85 °C ................................... 0.6 °C typ, 1.3 °C max
–40 to 85 °C ............................... 1.7 °C max
1 The maximum errors assume an isothermal error of 1.0 °C. Refer to the
Cold-Junction Temperature Measurement Accuracy section for more information.
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© National Instruments Corp. 15 NI 9211E Operating Instructions and Specifications
MTBF ............................................... 633,012 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.
Temperature Measurement Accuracy
Measurement sensitivity1
With autozero channel on
Types J, K, T, E, N ............... <0.07 °C
Types B ................................ <0.25 °C
Types R, S ............................ <0.60 °C
1 Measurement sensitivity represents the smallest change in temperature that a sensor
can detect. It is a function of noise. The values assume the full measurement range
of the standard thermocouple sensor according to ASTM E230-87.
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NI 9211E Operating Instructions and Specifications 16 ni.com
With autozero channel off
Types J, K, T, E, N ............... <0.05 °C
Type B .................................. <0.20 °C
Types R, S ............................ <0.45 °C
Figures 5, 6, 7, 8, and 9 show the typical and maximum errors1for
each thermocouple type when used with the NI 9211E over the full
temperature range. The figures also display the maximum errors
for the thermocouple types with the NI 9211E at room
temperature, which is 15 to 35 °C. The figures account for gain
errors, offset errors, differential and integral nonlinearity,
quantization errors, noise errors, and isothermal errors. The figures
do not account for the accuracy of the thermocouple itself.
1 The maximum errors assume an isothermal error of 1.0 °C. Refer to the
Cold-Junction Temperature Measurement Accuracy section for more information.
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© National Instruments Corp. 17 NI 9211E Operating Instructions and Specifications
Figure 5. Thermocouple Type J and N Errors
–200 0 200 400 600 800 1000 1200
0
1
2
3
4
Max (Autozero on), –40 to 85 °CMax (Autozero off), room temp
Typ (Autozero on), –40 to 85 °C
Measurement Error (°C)
Measured Temperature (°C)
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NI 9211E Operating Instructions and Specifications 18 ni.com
Figure 6. Thermocouple Type K Errors
–200 0 200 400 600 800 1000 1200
0
1
2
3
4
Measurement Error (°C)
Measured Temperature (°C)
Max (Autozero on), –40 to 85 °CMax (Autozero off), room temp
Typ (Autozero on), –40 to 85 °C
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© National Instruments Corp. 19 NI 9211E Operating Instructions and Specifications
Figure 7. Thermocouple Type T and E Errors
–200 0 200 400 600 800 1000
0
2
3
4
Measurement Error (°C)
Measured Temperature (°C)
1
Max (Autozero on), –40 to 85 °CMax (Autozero off), room temp
Typ (Autozero on), –40 to 85 °C
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