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OMB-DAQ-TC-RACK 32-Channel USB/IP Based Thermocouple Data Acquisition System

32-Channel USB/Ethernet Based Thermocouple Input Data Acquisition System

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OMB DAQ TC RACK 32 Channel USBIP Based Thermocouple Data Acquisition System 13114

 The OMB-DAQ-TC-RACK and OMB-DAQ-TC-RACK-EXP32 offer exceptional performance and accuracy for thermocouple measurement applications at a low cost per channel. Offering both Ethernet and USB ports, the OMB-DAQ-TC-RACK provides 32 channels of 24-bit resolution for medium channel installations. The OMB-DAQ-TC-RACK-EXP32 adds 32 high-precision channels to support larger installations. Accuracy is designed into the product with sigma-delta 24-bit ADCs, differential inputs, thermocouple-to-host isolation and cold-junction compensation (CJC) for each channel to reduce the effects of thermal gradients. With digital alarming notifications when a temperature exceeds programmed limits, the OMB-DAQ-TC-RACK and OMB-DAQ-TC-RACK-EXP32 offer the perfect solution for temperature monitoring applications including server rooms, refrigerated storage, and long-run test cells.

• 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
(Typical for 25°C (77°F) unless otherwise specified)These specifications apply to both the OMB-DAQ-TC-RACK and OMB-DAQ-TC-RACK-EXP32 unless noted otherwise.
Thermocouple Input
A/D Converter TypeDelta-Sigma
A/D Resolution24-bit
Number of Channels32 (64 when OMB-DAQ-TC-RACK is connected to OMB-DAQ-TC-RACK-EXP32)
Filtering Options50 Hz or 60 Hz noise filtering, software-selectable
Isolation Between Any Thermocouple Input Channel & Chassis Ground500 Vdc absolute max
Channel ConfigurationSoftware-selectable to match thermocouple sensor type
Differential Input Voltage Range±78.125 mV
Absolute Maximum Input Voltage (Between any Two TCx Inputs)±25V (power on), ±25V (power off)
Differential Input Impedance
50 Hz Filtering, Power On26 M?
60 Hz Filtering, Power On20 M?
Input Current
Open Thermocouple Detect Disabled2 nA
Open Thermocouple Detect Enabled75 nA
Common Mode Rejection
50 Hz Filtering at DC and fIN=50 Hz110 dB
60 Hz Filtering at DC and fIN=60 Hz110 dB
Noise Rejection
50 Hz Filtering at fIN=50 Hz80 dB typ
60 Hz Filtering at fIN=60 Hz80 dB typ
Input Bandwidth
50 Hz Filtering22 Hz
60 Hz Filtering26 Hz
Crosstalk Between Any Two Thermocouple Inputs:-90 dB
Sample Rate3 Hz max (per channel); the enabled thermocouple inputs are continuously converted at the maximum 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 different common mode voltages, the channels with floating thermocouples sensors are biased to approximately the average value of the applied common mode voltages. Each of the applied common mode voltages must then be less than or 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 in Temperature That Can Be Detected):
Thermocouple Type J, K, T, E, N0.05°C
Thermocouple Type R, S0.10°C
Thermocouple Type B0.15°C
Warm-Up Time20 minutes min
Open Thermocouple Detect Response Time1 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 channels Channel configuration is stored on EEPROM external to the isolated microcontroller by the firmware whenever any item is modified. Modification is performed by commands issued from an external application, and the configuration is made nonvolatile through the use of the EEPROM.
Digital Input
Number of Inputs8 channels (16 when OMB-DAQ-TC-RACK connected to OMB-DAQ-TC-RACK-EXP32)
ConfigurationFixed Input
Input voltage Range0 to 15V
Input TypeCMOS (Schmitt Trigger)
Input Characteristics100 k? pull-up resistor, 28.7 k? series resistor
Maximum Input Voltage Range0 to 20V max (power on/off, relative to IGND pins)
Pull-Up ConfigurationAll pins pulled up to 5V via individual 100 k? resistors using slide switch SW5; SW5 default position are on (pulled up)
Transfer Rate (Software Paced)500 port reads per second typ
Input High Voltage1.3V min, 2.2V max
Input Low Voltage1.5V max, 0.6V min
Schmitt Trigger Hysteresis0.4V min, 1.2V max
Digital Output
Number of Outputs32 channels, shared with alarms (64 when OMB-DAQ-TC-RACK connected to OMB-DAQ-TC-RACK-EXP32)
ConfigurationOpen drain output
Output Characteristics100 k? pull-up, open drain (DMOS transistor)
Pull-Up ConfigurationAll pins pulled up to 5V through individual 100 k? resistors using slide switches SW1-SW4; the default positions for SW1-SW4 are on (pulled up)
Transfer Rate (Software Paced )Digital output–500 port writes per second typ
Output Voltage Range
0 to 5VInternal 100 k? pull-up resistors connected to 5V by default
0 to 15VMax (using external pull-up resistor)
GroundPins labeled IGND are isolated from AGND and chassis ground
Off State Leakage Current0.1 µA
Sink Current Capability100 mA max (continuous) per output pin
DMOS Transistor On-Resistance (Drain to Source)4 O
Environmental
Operating Temperature Range0 to 45°C (32 to 113°F)
Storage Temperature Range-40 to 85°C (-40 to 185°F)
Humidity0 to 90% RH non-condensing
Mechanical
Dimensions482.6 L x 128.6 W x 43.18 mm H (19 x 6.15 x 1.74")
WeightOMB-DAQ-TC-RACK: 3.8 lb (1.73 kg); OMB-DAQ-TC-RACK-EXP32: 3.2 lb (1.45 kg)
  • Thumbnail of document Manual - OMB-DAQ-TC-RACK 32-Channel USB/IP Based Thermocouple Data Acquisition System
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    Manual - OMB-DAQ-TC-RACK 32-Channel USB/IP Based Thermocouple Data Acquisition System

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