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USB and 10/100 Ethernet Interface
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32 Differential Thermocouple Inputs
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Expandable to 64 Thermocouple Inputs with OMB-DAQ-TC-RACK-EXP32 Expansion Module
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Thermocouple Channel-to-Host Isolation
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Inputs Connect Easily to Built-In Miniature Thermocouple Jacks
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24-Bit Resolution
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3 S/s Per Channel Maximum Sample Rate
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Supports Types J, K, T, E, R, S, B, and N Thermocouples (Software-Selectable Per Channel)
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Per Channel Out-of-Range Alarm Configuration
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Cold-Junction Compensation (CJC) Sensor Per Channel
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Open Thermocouple Detection
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8 Digital Inputs and 32 Digital Outputs/Alarms
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Expandable to 16 Digital Inputs, and 64 Digital Outputs/Alarms with OMB-DAQ-TC-RACK-EXP32 Expansion Module
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Isolated from Thermocouple Inputs and Host
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50-pin Header Connector (Cable Sold Separately)
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19" Rack Mountable
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Requires External Power (Power Adaptor Included with OMB-DAQ-TC-RACK)
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OMB-DAQ-TC-RACK-EXP32 is Powered by Connected OMB-DAQ-TC-RACK
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View related products - USB, RS232, RS485 and Ethernet Data Acquisition Systems
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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.
Specifications
(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 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 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 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
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 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 kΩ pull-up resistor, 28.7 kΩ
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 kΩ 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
Digital Output
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 kΩ pull-up, open drain
(DMOS transistor)
Pull-Up Configuration: All pins pulled up to 5V through
individual 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 port
writes per second typ
Output Voltage Range:
0 to 5V: Internal 100 kΩ 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
Environmental
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
Mechanical
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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† All dollar amounts on this site are shown in US currency.
Note: Comes complete with 1 m (3.2') CAT-6 Ethernet cable, 1.8 m (6') USB cable, TracerDAQ software and operator’s manual on CD.
Ordering Example: (1) OMB-DAQ-TC-RACK 32-channel USB/ethernet based thermocouple input data acquisition system, USD$86,825.00, plus (1) OMB-DAQ-TC-RACK-EXP32 32-channel expansion module for OMB-DAQ-TC-RACK, USD$61,045.00, USD$86,825.00 + 61,045.00 = USD$147,870.00
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Related Links -
Manual, Related Products
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Product Manual |
Download 32-Channel USB/Ethernet Thermocouple Data Acquisition Sys |
Download Expansion Module for OMB-DAQ-TC-RACK |
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