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32-Channel USB-Ethernet Based Thermocouple Input Data Acquisition System
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
  • USB and 10/100 Ethernet Interface
  • 32 Differential Thermocouple Inputs
  • Expandable to 64 Thermocouple Inputs with OMB-DAQ-TC-RACK-EXP32 Expansion Module
  • Thermocouple Channel-to-Host Isolation
  • Inputs Connect Easily to Built-In Miniature Thermocouple Jacks
  • 24-Bit Resolution
  • 3 S/s Per Channel Maximum Sample Rate
  • Supports Types J, K, T, E, R, S, B, and N Thermocouples (Software-Selectable Per Channel)
  • Per Channel Out-of-Range Alarm Configuration
  • Cold-Junction Compensation (CJC) Sensor Per Channel
  • Open Thermocouple Detection
  • 8 Digital Inputs and 32 Digital Outputs/Alarms
  • Expandable to 16 Digital Inputs, and 64 Digital Outputs/Alarms with OMB-DAQ-TC-RACK-EXP32 Expansion Module
  • Isolated from Thermocouple Inputs and Host
  • 50-pin Header Connector (Cable Sold Separately)
  • 19" Rack Mountable
  • Requires External Power (Power Adaptor Included with OMB-DAQ-TC-RACK)
  • OMB-DAQ-TC-RACK-EXP32 is Powered by Connected OMB-DAQ-TC-RACK
 Manuals (contact with email : [email protected])


The OMB-DAQ-TC-RACK and OMB-DAQ-TC-RACK-EXP32offer exceptional performance and accuracy forthermocouple measurement applications at a low costper channel. Offering both Ethernet and USB ports,the OMB-DAQ-TC-RACK provides 32 channels of24-bit resolution for medium channel installations. TheOMB-DAQ-TC-RACK-EXP32 adds 32 high-precisionchannels to support larger installations. Accuracy isdesigned into the product with sigma-delta 24-bit ADCs,differential inputs, thermocouple-to-host isolation andcold-junction compensation (CJC) for each channelto reduce the effects of thermal gradients. With digitalalarming notifications when a temperature exceedsprogrammed limits, the OMB-DAQ-TC-RACK andOMB-DAQ-TC-RACK-EXP32 offer the perfect solutionfor temperature monitoring applications including serverrooms, refrigerated storage, and long-run test cells.

(Typical for 25°C (77°F)unless otherwise specified)
These specifications apply to both the OMB-DAQ-TC-RACKand OMB-DAQ-TC-RACK-EXP32 unless noted otherwise.
Thermocouple Input
A/D Converter Type: Delta-Sigma
A/D Resolution: 24-bit
Number of Channels: 32 (64 when OMB-DAQ-TC-RACK isconnected to OMB-DAQ-TC-RACK-EXP32)
Filtering Options: 50 Hz or 60 Hz noise filtering,software-selectable
Isolation Between Any Thermocouple Input Channeland Chassis Ground: 500 Vdc absolute max
Channel Configuration: Software-selectable to matchthermocouple sensor type
Differential Input Voltage Range: ±78.125 mV
Absolute Maximum Input Voltage (Between anyTwo TCx Inputs): ±25V (power on), ±25V (power off)
Differential Input Impedance:
    50 Hz Filtering, Power On: 26 MΩ
    60 Hz Filtering, Power On: 20 MΩ
Input Current:
    Open Thermocouple Detect Disabled: 2 nA
    Open Thermocouple Detect Enabled: 75 nA
Common Mode Rejection:
    50 Hz Filtering at DC and fIN=50 Hz: 110 dB
    60 Hz Filtering at DC and fIN=60 Hz: 110 dB
Noise Rejection:
    50 Hz Filtering at fIN=50 Hz: 80 dB typ
    60 Hz Filtering at fIN=60 Hz: 80 dB typ
Input Bandwidth:
    50 Hz Filtering: 22 Hz
    60 Hz Filtering: 26 Hz
Crosstalk Between Any Two Thermocouple Inputs: -90 dB
Sample Rate: 3 Hz max (per channel); the enabledthermocouple inputs are continuously converted at themaximum A/D converter rate
Common Mode Voltage Range:
    TCx Channel to TCx Channel: ±1.40V
    TCx Channel Relative to Chassis Ground, fIN = 60 Hz:±3.5 Vac p-p
    TCx Channel Relative to Chassis Ground: ±48 Vdc
When thermocouple sensors are connected to differentcommon mode voltages, the channels with floatingthermocouples sensors are biased to approximately theaverage value of the applied common mode voltages. Eachof the applied common mode voltages must then be less thanor equal to the average common mode voltage ±1.40 V or[CMVapplied = (CMVaverage ±1.4 V)].
Input Noise (50 or 60 Hz Filtering): 510 nV rms
Gain Error (50 or 60 Hz Filtering): 0.004% FSR
Offset Error (50 or 60 Hz Filtering): 3 µV
Measurement Sensitivity (Smallest Change inTemperature That Can Be Detected):
    Thermocouple Type J, K, T, E, N: 0.05°C
    Thermocouple Type R, S: 0.10°C
    Thermocouple Type B: 0.15°C
Warm-Up Time: 20 minutes min
Open Thermocouple Detect Response Time: 1 s
CJC Sensor Accuracy (0 to 45°C): ±0.20°C typ, ±0.40°C max
Channel Configuration
Thermocouple (J, K, T, E, R, S, B, N): 32 differential channelsChannel configuration is stored on EEPROM external to theisolated microcontroller by the firmware whenever any item ismodified. Modification is performed by commands issued froman external application, and the configuration is made nonvolatilethrough the use of the EEPROM.

Digital Input
Number of Inputs: 8 channels (16 when OMB-DAQ-TC-RACKconnected to OMB-DAQ-TC-RACK-EXP32)
Configuration: Fixed input
Input Voltage Range: 0 to 15V
Input Type: CMOS (Schmitt trigger)
Input Characteristics: 100 kΩ pull-up resistor, 28.7 kΩseries resistor
Maximum Input Voltage Range: 0 to 20V max (power on/off,relative to IGND pins)
Pull-Up Configuration: All pins pulled up to 5V via individual100 kΩ resistors using slide switch SW5; SW5 default positionare on (pulled up)
Transfer Rate (Software Paced): 500 port reads persecond typ
Input High Voltage: 1.3V min, 2.2V max
Input Low Voltage: 1.5V max, 0.6V min
Schmitt Trigger Hysteresis: 0.4V min, 1.2V max

Digital Output
Number of Outputs: 32 channels, shared with alarms(64 when OMB-DAQ-TC-RACK connected toOMB-DAQ-TC-RACK-EXP32)
Configuration: Open drain output
Output Characteristics: 100 kΩ pull-up, open drain(DMOS transistor)
Pull-Up Configuration: All pins pulled up to 5V throughindividual 100 kΩ resistors using slide switches SW1-SW4;the default positions for SW1-SW4 are on (pulled up)
Transfer Rate (Software Paced): Digital output–500 portwrites per second typ
Output Voltage Range:
    0 to 5V: Internal 100 kΩ pull-up resistors connected to5V by default
    0 to 15V: Max (using external pull-up resistor)
Ground: Pins labeled IGND are isolated from AGND andchassis ground
Off State Leakage Current: 0.1 µA
Sink Current Capability: 100 mA max (continuous) per output pin
DMOS Transistor On-Resistance (Drain to Source): 4 O

Operating Temperature Range: 0 to 45°C (32 to 113°F)
Storage Temperature Range: -40 to 85°C (-40 to 185°F)
Humidity: 0 to 90% RH non-condensing
Dimensions: 482.6 L x 128.6 W x 43.18 mm H (19 x 6.15 x 1.74")
Weight: OMB-DAQ-TC-RACK: 3.8 lb (1.73 kg);OMB-DAQ-TC-RACK-EXP32: 3.2 lb (1.45 kg)
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