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8-Channel Thermocouple Input Ethernet Data Acquisition Module


8-Channel Thermocouple Input Ethernet Data Acquisition Module | OM-NET-TC


  • Eight 24-Bit Differential Thermocouple Inputs with Thermocouple Channel-to-Host Isolation
  • 4 Samples/Sec Channel Maximum Sample Rate
  • Two Integrated Cold Junction Compensation (CJC) Sensors
  • Open Thermocouple Detection
  • 8 Digital I/O Isolated From Thermocouple Inputs and Host
  • Digital Outputs Have ±24 mA Drive Capability and are Configurable as Thermocouple Alarms
  • 10/100 Ethernet Interface
USB, RS232, RS485 and Ethernet Data Acquisition Systems - View related products


The OM-NET-TC thermocouple input data acquisition module offers high-accuracy temperature measurement with an Ethernet interface. The device offers the best value per channel and the best possible accuracy because the accuracy of the internal measurement electronics exceeds the accuracy specifications of the thermocouple sensors. The OM-NET-TC is functionally equivalent to an OMEGATM OM-USB-TC module (USB interface to computer) which makes application migration very easy.

Ethernet Interface The OM-NET-TC has a built-in highspeed communication port. Users can remotely access and configure the device with software over the Internet.

Thermocouple Input Connect up to eight differential thermocouple (TC) input channels to the OM-NET-TC. The OM-NET-TC supports a maximum sample rate of 4 S/s per channel, and thermocouple types J, K, T, E, R, S, B and N. Thermocouple types are softwareselectable per channel.

Cold-Junction Compensation The OM-NET-TC has two high-resolution cold-junction compensation (CJC) sensors (one per four thermocouple inputs).

Open-Thermocouple Detection The OM-NET-TC is equipped with open-thermocouple detection (OTD) for all thermocouple input channels. With OTD enabled, users can monitor for broken or disconnected thermocouple inputs.

Digital I/O The OM-NET-TC has eight digital I/O channels that are electrically isolated from the analog circuits. Each bit is individually configurable for input or output. Data can be transferred at rates up to 5 kS/s when the device and host are connected by Ethernet to the same local network. Typical throughput is system-dependent. All DIO channels are pulled high by default to 5V through 47 kO resistors with a jumper on the circuit board. Each jumper configures the digital port for pull-up or pull-down.

Temperature Alarms Each digital output can be optionally configured as an alarm for each thermocouple input. When an alarm is enabled, the output line associated with the alarm is driven to the appropriate state determined by the alarm options and input temperature. Use the alarm outputs to control a device or application that indicates when a temperature threshold has been exceeded, or to indicate an open thermocouple condition.

Counter Input The 32-bit event counter pin counts TTL pulses, and accepts frequency inputs up to 10 MHz.

Power The OM-NET-TC requires external power from the 5V, 1A power adapter (OM-NET-PS) included with the device.

Calibration The OM-NET-TC is factorycalibrated using a NIST-traceable calibration process. Specifications are guaranteed for one year. For calibration beyond one year, Contact Omega and return the device for recalibration.

Software The OMB-NET-TC module ships with an impressive array of software, including the new TracerDAQ®, a full-featured, out-ofthe- box data logging, viewing, and analysis application. Driver support and detailed example programs are included for Universal Library programming libraries for Microsoft® Visual Studio® programming languages, and other languages, including DASYLab®, and ULx for NI LabVIEW® (comprehensive library of VIs and example programs compatible with 32- bit and 64-bit LabVIEW 2010 or later) and InstaCalTM installation, calibration and test utility-powerful solutions for programmers and nonprogrammers alike. These modules operate under Microsoft Windows® VISTA/7/8/10 (32-bit and 64-bit) operating systems. The OMB-NET-TC data acquisition module is supplied with TracerDAQ software which is a collection of four virtual instrument applications used to graphically display and store input data and generate output signals:
    • Strip Chart—Log and graph values acquire from analog inputs, digital inputs, temperature inputs and counter inputs
    • Oscilloscope—Display values acquired from analog inputs
    • Function Generator—Generate waveforms for analog outputs
    • Rate Generator—Generate waveforms for counter outputs TracerDAQ PRO is an enhanced version of TracerDAQ and is available as a purchased upgrade (SWD-TRACERDAQ-PRO). A comparison of some of the features included in TracerDAQ vs TracerDAQ Pro (see Spec page PDF).

(Typical for 25°C unless otherwise specified)
A/D Converter Type: Delta-Sigma
A/D Resolution: 24-bit
Number of Channels: 8 differential channels
Isolation Between Any Thermocouple Input Channel and Digital/Chassis
Ground: 500 Vdc absolute max
Channel Configuration: Software selectable for thermocouple types J, K, T, E, R, S, B, N (factory default configuration is type J). 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 non-volatile through the use of the EEPROM.
Differential Input Voltage Range: ±0.128V (calibration is performed at ±70 mV)
Absolute Maximum Input Voltage (Between any Two TCx Inputs): ±25V (power on), ±25V (power off)
Differential Input Impedance: 40 MΩ
Input Current:
    Open Thermocouple Detect Disabled: 1 nA
    Open Thermocouple Detect Enabled: 65 nA
Common Mode Rejection (fin = 50 Hz or 60 Hz): 110 dB
Noise Rejection (fin = 50 Hz or 60 Hz): 75 dB
Input Bandwidth: 10 Hz
Crosstalk Between Any Two Thermocouple Inputs: -90 dB
Sample Rate: 4 Hz max (per channel). The enabled thermocouple inputs are continuously converted at the maximum A/D converter rate. If channels are enabled and have an open thermocouple connection the sampling rate will be lower.
Input Noise: 250 nV rms
Gain Error: 0.006% FSR
Offset Error: 3 µV
Measurement Sensitivity (Smallest Change in Temperature That Can Be Detected):
Thermocouple Type J,K,T,E,N: 0.09°C
Thermocouple Type R,S: 0.11°C
Thermocouple Type B: 0.13°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
Digital Type: 5V TTL input/ CMOS output
Number of I/O: One port of 8 bits, shared with temperature alarms Configuration: Each bit can be independently configured for input or output
Pull-Up Configuration: All pins pulled up to 5V using 47 K resistors (default). Can be changed to pull-down using an internal jumper
Digital I/O Transfer Rate (System- Paced): 100 to 5000 port reads/writes or single bit reads/writes per second typ, on local network. This is the typical throughput when the device and host are both connected by Ethernet to the same local network. The throughput can vary significantly, and typical throughput is not guaranteed if a wireless connection is involved or data is sent over the internet
Alarm Functionality: Any combination of DIO bits may be configured to become outputs and go to defined values when an Ethernet connection with a host is established or lost
Power On and Reset State: All bits are input unless the alarm functionality is enabled for them
Input High Voltage Threshold: 2.0V min
Input High Voltage Limit: 5.5V absolute max
Input Low Voltage Threshold: 0.8V max
Input Low Voltage Limit: -0.5V absolute min, 0 V recommended min
Output High Voltage: 4.4V min (IOH = -50 µA), 3.76V min (IOH = -24 µA)
Output Low Voltage: 0.1V max (IOL = 50 µA), 0.44V max (IOL = 24 µA)
Power On and Reset State: Input
Number of Alarms: 8 (one per digital I/O line)
Alarm Functionality: Each alarm controls its associated digital I/O line as an alarm output. When an alarm is enabled, its associated I/O line is set to output and driven to the appropriate state determined by the alarm options and input temperature. The alarm configurations are stored in non-volatile memory and loaded at power on
Alarm Input Modes:
    • Alarm when input temperature =T1, reset alarm when input temperature < T2
    • Alarm when input temperature =T1, reset alarm when input temperature >T2
    • Alarm when input temperature is T2
    • T1 and T2 may be independently set for each alarm
Alarm Error Modes:
    • Alarm on temperature reading only
    • Alarm on temperature reading or open thermocouple error
    • Alarm on thermocouple error only
Alarm Output Modes:
    • Disabled, digital I/O line may be used for normal operation
    • Enabled, active high output (DIO line goes high when alarm condition is met)
    • Enabled, active low output (DIO line goes low when alarm condition is met)
Alarm Latency: 1 second (Alarm settings are applied when changed and at power-ON. Temperatures are converted on enabled channels and processed for alarm conditions regardless of the communications connectivity)
Pin Name: CTR
Counter Type: Event counter
Number of Channels: 1
Input Type: Schmitt trigger, 47 kO pulldown to ground
Input Source: CTR screw terminal Resolution: 32 bits
Schmitt Trigger Hysteresis: 0.6V min, 1.7V max
Input High Voltage Threshold: 1.9V min, 3.6V max
Input High Voltage Limit: 5.5V absolute max
Input Low Voltage Threshold: 1.0V min, 2.3V max
Input Low Voltage Limit: -0.5V absolute min, 0V recommended min
Input Frequency: 10 MHz max
High Pulse Width: 50 ns min
Low Pulse Width 50 ns min
EEPROM: 4096 bytes
External Power Supply: 5V, 1A (via included AC adapter)
Supply Current (Quiescent Current): 177 mA typ (this is the total quiescent current requirement for the device that includes the LEDs and does not include any potential loading of the digital I/O bits or +VO terminal
User Output Voltage Range (Available at +VO Terminal): 4.40V min to 5.25V max, assumes supplied AC adapter is used
User Output Current (Available at +VO Terminal): 10 mA max
Ethernet Connection Ethernet Type: 100 Base-TX, 10 Base-T
Communication Rates: 10/100 Mbps, auto-negotiated
Connector: RJ-45, 8 position
Cable Length: 1 meter standard and up to 100 meters (328') max
Additional Parameters: HP auto-MDIX support
Protocols Used: TCP/IP (IPv4 only), UDP
Network Ports Used: UDP:54211 (discovery), UDP:6234 (bootloader only), TCP:54211 (com¬mands) Network IP Configuration: DHCP + linklocal, DHCP, static, link-local
Network Name: E-TC-xxxxxx, where xxxxxx are the lower 6 digits of the device MAC address
Network Name Publication: By NBNS (responds to b-node broadcasts, therefore only available on the local subnet)
Factory Default IP Address:
Factory Default Subnet Mask:
Factory Default Gateway:
Factory Default DHCP Setting: DHCP + link-local enabled
Security Implementation: TCP sockets are not opened unless application sends the correct PIN code (stored in non-volatile memory, may be changed by user, default value 0000)
Number of Concurrent Sessions: 1
Vulnerabilities: TCP sequence number approximation vulnerability
Factory Reset Button: Used to reset the network configuration settings to the factory default values.
Power LED (Top) 4.2V < Vext <5.6V: On
Vext <4.2V, Vext >5.6V: Off (power fault)
Activity LED (Bottom): On when there is a valid host connection and blinks when a command is received
Ethernet Connector LEDs Left, Green: Link/activity indicator; on when there is a valid Ethernet link and blinks when network activity is detected.
Right, Yellow: Speed indicator; on for 100 Mbps, off for 10 Mbps or no link.
Operating Temperature Range: 0 to 55°C max (32 to 131°F)
Storage Temperature Range: -40 to 85°C max (-40 to 185°F)
Humidity: 0 to 90% RH non-condensing max
Screw Terminal Connectors Connector Type: Screw terminal
Wire Gauge Range: 16 to 30 AWG
Dimensions: 117.9 L × 82.8 W × 29.0 mm H (4.64 × 3.26 × 1.14")
Weight: 0.4 kg (0.88 lb)
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8-channel thermocouple input Ethernet data acquisition module
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DIN rail mounting kit for OM-NET-TC
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Spare AC power adapter for OM-NET-TC, 100/240 Vac 50/60 Hz input, 5V output (includes field interchangeable plugs for US, UK, Europe and Australia)
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Note: Comes complete with 1 m (3.2') CAT-6 Ethernet cable, universal AC adapter, quick start guide, software and operator’s manual on CD.
Ordering Example: OM-NET-TC 8-channel thermocouple input Ethernet data acquisition module.