NI-9214 Specifications

Definitions

Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.

Characteristics describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.

  • Typical specifications describe the performance met by a majority of models.
  • Nominal specifications describe an attribute that is based on design, conformance testing, or supplemental testing.

Specifications are Typical unless otherwise noted.

TB-9214 Pinout



Table 1. Signal Descriptions
Signal Description
COM Common reference connection
TC+ Positive thermocouple connection
TC- Negative thermocouple connection

Input Characteristics

Number of channels

NI-9214

16 thermocouple channels, 1 internal autozero channel

TB-9214

3 internal cold-junction compensation channels

ADC resolution

24 bits

Type of ADC

Delta-Sigma

Sampling mode

Scanned

Voltage measurement range

±78.125 mV

Temperature measurement ranges

Works over temperature ranges defined by NIST (J, K, T, E, N, B, R, S thermocouple types)

Timing Mode Conversion Time (Per Channel) Sample Rate[1]1 If you are using fewer than all channels, the sample rate might be faster. The maximum sample rate = 1/(Conversion Time x Number of Channels), or 100 S/s, whichever is smaller. Sampling faster than the maximum sample rate may result in the degradation of accuracy. (All Channels[2]2 Including the autozero and cold-junction compensation channels.)
High-resolution 52 ms 0.96 S/s
High-speed 735 μs 68 S/s
Common-mode voltage range

Channel-to-COM

±1.2 V minimum

COM-to-earth ground

±250 V

Common-mode rejection ratio
High-resolution mode (at DC and 50 Hz to 60 Hz)

Channel-to-COM

100 dB

COM-to-earth ground

170 dB

High-speed mode (at 0 Hz to 60 Hz)

Channel-to-COM

70 dB

COM-to-earth ground

120 dB

Thermocouple signal input bandwidth

High-resolution mode

14.4 Hz

High-speed mode

80 Hz

Open thermocouple settling time when switching OTD on/off

6 s

High-resolution noise rejection (at 50 Hz and 60 Hz)

65 dB

Overvoltage proection

±30 V between any two inputs

Differential input impedance

20 MΩ

Input noise
High-resolution mode

RMS

220 nVrms

Crest factor

6

High-speed mode

RMS

2.8 μVrms

Crest factor

10

Gain error

High-resolution mode

0.03% typical at 25 °C, 0.15% maximum at -40 °C to 70 °C

High-speed mode

0.04% typical at 25 °C, 0.16% maximum at -40 °C to 70 °C

Offset error

High-resolution mode

2 μV typical, 8 μV maximum

High-speed mode

15 μV typical, 23 μV maximum

Offset error from source impedance with OTD enabled

Add 0.2 μV per Ω

Input current

OTD enabled

200 nA

OTD disabled

400 pA

OTD bias current drift

200 pA/°C maximum

Cold-junction compensation accuracy[3]3 Cold-junction compensation accuracy assumes that the thermocouple wires are 0.25 mm2 (24 AWG) or smaller.

23 ±5 °C

0.25 °C typical

-20 °C to 70 °C

0.6 °C maximum

-40 °C to 70 °C

0.9 °C maximum

Temperature Measurement Accuracy

Measurement sensitivity[4]4 Measurement sensitivity represents the smallest change in temperature that a sensor can detect. It is a function of noise. The values assume the median of the full measurement range of the standard thermocouple sensor according to NIST Monograph 175.
High-resolution mode

Types J, K, T, E, N

0.01 °C

Types R, S

0.03 °C

Type B

0.04 °C

High-speed mode

Types J, K, T, E

0.10 °C

Type N

0.11 °C

Types R, S

0.36 °C

Type B

0.48 °C

The following thermocouple measurement tables and graphs show the module accuracy for each thermocouple type under the following conditions:

  • Autozero is enabled.
  • Open thermocouple detection is disabled.
  • 0 V common-mode voltage.

The tables include all measurement errors of the module and terminal block including RMS noise. The tables do not include the accuracy of the thermocouple itself.

Table 2. Thermocouple Type J/N Measurement Accuracy (°C)
Temperature High-Resolution High-Speed
Typical Maximum Typical Maximum
23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C 23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C
-100 °C 0.53 1.70 1.70 1.49 2.79 2.79
0 °C 0.40 1.24 1.26 1.17 2.12 2.12
100 °C 0.37 1.00 1.24 1.05 1.76 2.00
300 °C 0.39 1.16 1.41 0.96 1.78 1.98
500 °C 0.44 1.44 1.69 0.97 1.96 2.17
700 °C 0.45 1.58 1.80 1.03 2.24 2.42
900 °C 0.50 1.89 2.10 1.12 2.59 2.77
1100 °C 0.59 2.33 2.57 1.24 2.99 3.18
Table 3. Thermocouple Type K Measurement Accuracy (°C)
Temperature High-Resolution High-Speed
Typical Maximum Typical Maximum
23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C 23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C
-100 °C 0.50 1.56 1.56 1.17 2.33 2.33
0 °C 0.36 1.06 1.10 0.86 1.64 1.66
100 °C 0.37 0.95 1.20 0.87 1.50 1.76
300 °C 0.42 1.23 1.49 0.95 1.81 2.08
700 °C 0.52 1.82 2.08 1.11 2.46 2.72
900 °C 0.60 2.21 2.48 1.25 2.91 3.19
1100 °C 0.69 2.64 2.93 1.41 3.42 3.71
1400 °C 0.85 3.40 3.71 1.70 4.32 4.64
Table 4. Thermocouple Type T/E Measurement Accuracy (°C)
Temperature High-Resolution High-Speed
Typical Maximum Typical Maximum
23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C 23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C
-100 °C 0.54 1.76 1.76 1.25 2.59 2.59
0 °C 0.37 1.17 1.17 0.88 1.77 1.77
100 °C 0.33 0.89 1.04 0.77 1.38 1.53
300 °C 0.33 1.00 1.17 0.69 1.41 1.53
500 °C 0.37 1.25 1.42 0.69 1.60 1.77
700 °C 0.43 1.58 1.74 0.78 1.96 2.13
900 °C 0.49 1.94 2.11 0.90 2.37 2.55
Table 5. Thermocouple Type R/S Measurement Accuracy (°C)
Temperature High-Resolution High-Speed
Typical Maximum Typical Maximum
23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C 23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C
0 °C 0.81 2.80 2.80 4.50 6.85 6.85
100 °C 0.61 1.94 1.94 3.30 4.91 4.91
300 °C 0.54 1.84 1.84 2.74 4.26 4.27
700 °C 0.57 2.15 2.15 2.54 4.32 4.32
900 °C 0.59 2.31 2.31 2.47 4.38 4.38
1100 °C 0.60 2.48 2.48 2.42 4.47 4.47
1400 °C 0.67 2.86 2.86 2.49 4.85 4.85
Table 6. Thermocouple Type B Measurement Accuracy (°C)
Temperature High-Resolution High-Speed
Typical Maximum Typical Maximum
23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C 23 °C ± 5 °C -20 °C to 70 °C -40 °C to 70 °C
0 °C — — — — — —
100 °C — — — — — —
300 °C 0.94 3.40 3.45 7.36 10.40 10.45
700 °C 0.51 1.97 2.00 3.46 5.21 5.23
900 °C 0.46 1.86 1.88 2.88 4.52 4.54
1100 °C 0.43 1.89 1.89 2.55 4.19 4.21
1400 °C 0.45 2.04 2.05 2.33 4.10 4.11
Figure 1. Thermocouple Error, Typical (High-Resolution), 23 °C±5 °C


Figure 1. Thermocouple Error, Maximum (High-Resolution), -20 °C to 70 °C


Power Requirements

Power consumption from chassis

Active mode

300 mW maximum

Sleep mode

30 μW maximum

Thermal dissipation (at 70 °C)

Active mode

630 mW maximum

Sleep mode

450 mW maximum

Physical Characteristics

Screw-terminal wiring

Gauge

0.05 mm2 to 0.5 mm2 (30 AWG to 20 AWG) copper conductor wire

Wire strip length

Outer insulation

51 mm (2.0 in.) of insulation stripped from the end

Inner insulation

5.1 mm (0.2 in.) of insulation stripped from the end

Temperature rating

90 °C minimum

Torque for screw terminals

0.3 N · m (2.66 lb · in.)

Wires per screw terminal

One wire per screw terminal

TB-9214 securement

Securement type

Jackscrews provided

Torque for jackscrews

0.4 N · m (3.6 lb · in.)

Weight

NI-9214

141 g (5.0 oz)

TB-9214

102 g (3.6 oz)

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

250 V RMS, Measurement Category II

Withstand

2,300 V RMS, verified by a 5 s dielectric withstand test

Shock and Vibration

To meet these specifications, you must panel mount the system.

Operating vibration

Random

5 g RMS, 10 Hz to 500 Hz

Sinusoidal

5 g, 10 Hz to 500 Hz

Operating shock

30 g, 11 ms half sine; 50 g, 3 ms half sine; 18 shocks at 6 orientations

Environmental

Refer to the manual for the chassis you are using for more information about meeting these specifications.

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

-40 °C to 70 °C

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

-40 °C to 85 °C

Ingress protection

IP40

Operating humidity (IEC 60068-2-30)

10% RH to 90% RH, noncondensing

Storage humidity (IEC 60068-2-30)

5% RH to 95% RH, noncondensing

Pollution Degree

2

Maximum altitude

2,000 m

Indoor use only.

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9214 at ni.com/calibration.

Calibration interval

1 year

1 If you are using fewer than all channels, the sample rate might be faster. The maximum sample rate = 1/(Conversion Time x Number of Channels), or 100 S/s, whichever is smaller. Sampling faster than the maximum sample rate may result in the degradation of accuracy.

2 Including the autozero and cold-junction compensation channels.

3 Cold-junction compensation accuracy assumes that the thermocouple wires are 0.25 mm2 (24 AWG) or smaller.

4 Measurement sensitivity represents the smallest change in temperature that a sensor can detect. It is a function of noise. The values assume the median of the full measurement range of the standard thermocouple sensor according to NIST Monograph 175.