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USER GUIDE AND SPECIFICATIONS

USB-9211/9211A

4-Channel, 24-Bit Thermocouple Input Devices

This user guide describes how to use the National Instruments 
USB-9211/9211A devices and lists the specifications.

Introduction

The NI USB-9211/9211A data acquisition device provides a USB interface 
for four channels of 24-bit thermocouple inputs with integrated signal 
conditioning. 

The NI USB-9211 consists of two components: an NI 9211 module and a 
USB-9161 carrier, as shown in Figure 1. The NI USB-9211A consists of 
two components: an NI 9211 module and a USB-9162 carrier, as shown in 
Figure 1.

Figure 1.  

USB-9211/9211A Components

 

 NI 9211

USB-9161/9162

USB-9211/9211A

Summary of Contents for 9211A

Page 1: ...9211 9211A data acquisition device provides a USB interface for four channels of 24 bit thermocouple inputs with integrated signal conditioning The NI USB 9211 consists of two components an NI 9211 mo...

Page 2: ...the combined system may be limited Refer to the Specifications section for more details Hot Surface This icon denotes that the component may be hot Touching this component may result in bodily injury...

Page 3: ...evices and circuits connected to the module are properly insulated from human contact Caution When module terminals are live with hazardous voltages make sure that the terminals are not accessible by...

Page 4: ...d the USB 9161 9162 carrier are packaged separately Refer to Figure 3 while completing the following assembly steps 1 Make sure that no signals are connected to the NI 9211 module and the USB cable is...

Page 5: ...3 Module Installation 4 Squeeze the latches and insert the NI 9211 module into the carrier 5 Press firmly on the connector side of the NI 9211 module until the latches lock the module into place as sh...

Page 6: ...o the USB 9211 9211A and the other end into an available USB port on the computer LED Indicator The LED indicator indicates device status Table 2 LED State Device Status LED State Device Status Not li...

Page 7: ...the thermocouple TC The USB 9211 9211A also has a common terminal COM that is internally connected to the isolated ground reference of the module Caution The high voltage screw terminal backshell mus...

Page 8: ...shell must be installed when using hazardous voltages 42 4 Vpk 60 VDC Refer to Figure 7 while completing the following steps 1 Connect the leads to the screw terminal and secure with the strain relief...

Page 9: ...e TC and COM terminals and between the TC and COM terminals Each channel is filtered and then sampled by a 24 bit analog to digital converter ADC There is a current source between the TC and TC termin...

Page 10: ...t errors depend in part on the thermocouple type the temperature being measured the accuracy of the thermocouple and the cold junction temperature Using the Autozero Channel The USB 9211 9211A has an...

Page 11: ...res 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...

Page 12: ...1000 0 2 3 4 Max over Temp Range with Autozero Max at Room Temp Range without Autozero Typ over Temp Range with Autozero Error C Measured Temperature C 1 200 0 200 400 600 800 1000 1200 0 1 2 3 4 Max...

Page 13: ...hermal gradient generated across the terminals can cause the terminals of different channels to be at different temperatures so the resulting measurement creates errors not only in absolute accuracy b...

Page 14: ...ct any extension wires to thermocouple wires use wires made of the same conductive material Specifications The following specifications are typical at 25 C unless otherwise noted All voltages are rela...

Page 15: ...50 60 Hz Overvoltage protection 30 V between any input and common Differential input impedance 20 M Input current 50 nA Input noise 1 Vrms Gain error 0 05 max at 25 C 0 06 typ over temperature 0 1 max...

Page 16: ...m 5 51 in 3 37 in 0 99 in Weight Approx 350 g 12 3 oz Screw terminal wiring 12 to 24 AWG wire with 10 mm 0 39 in of insulation stripped from the end Torque for screw terminals 0 5 0 6 N m 4 4 5 3 lb i...

Page 17: ...and electronics Isolation Channel to channel No isolation between channels Channel to earth ground Withstand 2 300 Vrms 5 seconds max Continuous 250 Vrms Measurement Category II Measurement Category I...

Page 18: ...duct meets the essential requirements of applicable European Directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility Directive EMC 89 336 E...

Page 19: ...National Instruments also has offices located around the world to help address your support needs For telephone support in the United States create your service request at ni com support and follow th...

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