32-Channel USB/Ethernet Based Thermocouple Input Data Acquisition System
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- 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
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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.
(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.
A/D Converter Type: Delta-Sigma
A/D Resolution: 24-bit
Number of Channels: 32 (64 when OMB-DAQ-TC-RACK is connected to OMB-DAQ-TC-RACK-EXP32)
Filtering Options: 50 Hz or 60 Hz noise filtering, software-selectable
Isolation Between Any Thermocouple Input Channel and Chassis Ground: 500 Vdc absolute max
Channel Configuration: Software-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 On: 26 M?
60 Hz Filtering, Power On: 20 M?
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
50 Hz Filtering at fIN=50 Hz: 80 dB typ
60 Hz Filtering at fIN=60 Hz: 80 dB typ
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 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, 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
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.
Number of Inputs: 8 channels (16 when OMB-DAQ-TC-RACK connected to OMB-DAQ-TC-RACK-EXP32)
Configuration: Fixed input
Input Voltage Range: 0 to 15V
Input Type: CMOS (Schmitt trigger)
Input Characteristics: 100 k? pull-up resistor, 28.7 k? series 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 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 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
Number of Outputs: 32 channels, shared with alarms (64 when OMB-DAQ-TC-RACK connected to OMB-DAQ-TC-RACK-EXP32)
Configuration: Open drain output
Output Characteristics: 100 k? pull-up, open drain (DMOS transistor)
Pull-Up Configuration: All 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 5V: Internal 100 k? pull-up resistors connected to 5V by default
0 to 15V: Max (using external pull-up resistor)
Ground: Pins labeled IGND are isolated from AGND and chassis 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)
Is the ethernet communication protocol publicly available? We would like to communicate with the DAQ directly from an embedded application, without universal library. Thank you
Is the software compatible with Windows 10?
Will this interface to a SCADA system over Ethernet I/P such as Ignition (Inductive Automation) for data acquisition?
How well do the OMB-DAQ-TC-RACK devices interface with a PLC? What is the minimum time to read in all 32 channels? I know I can expand to 64 channels but how about +/- 300 channels. Would 300 channels require (5) 64 channel setups?
Can you purchase the item calibrated to NIST?