Need assistance? Call us: 1-800-663-4209
OM-WEB-TC-Series
8-Channel Web-Enabled Thermocouple Input Module
- Built-In Web Server
- 8 Thermocouple Input Channels
- Supports Types J, K, T, E, N, R, S, B Thermocouples
- Built-In Cold Junction Compensation and Open Thermocouple Detection
Product Overview
- Accuracy ± 0.75 °C
- Analog I/O Note Analog Input Note: Analog Inputs;A/D Converter: Four dual 24-bit sigma delta A/D converters;Input Isolation: 500 Vdc minimum between field wiring and USB interface;Number of Channels: 8 differential thermocouple inputs;Differential Input Voltage Range: ±0.080V;Absolute Maximum Input Voltage: ±25V (power on), ±40V (power off);Throughput Rate: 2 samples/sec maximum for all active channels;Input Impedance: 5 GΩ minimum;Input Leakage Current: 105 nA maximum (with open thermocouple detection enabled);Normal Mode Rejection Ratio: 90 dB minimum;Common Mode Rejection Ratio: 100 dB minimum;Warm-Up Time: 30 minutes maximum;Open Thermocouple Detection:3 sec open detection time (maximum);CJC Sensor Accuracy:-0.75 to 0.5°C maximum (15 to 35°C); -1.5 to 1.25°C maximum (0 to 55°C)
- CMRR 100 dB
- Data Interface Ethernet
- Data Interface Note Ethernet Type - 10Base-T;Protocols Implemented: IP, ARP, ICMP, DHCP, UDP, TCP, NBNS, HTTP ;UDP Messaging Protocol: UDP port 54211;TCP Downloading Protocol: TCP port 54267;HTTP 1.0 Alternate Port: TCP port 49152-65535 (not including 54267);Network Name: webtc_xxxxx, where xxxxx is the device’s serial number;Maximum Number of Simultaneous HTTP Connections: 3;Maximum Number of Non-HTTP TCP Sockets: 5;Network Factory Default Settings;"IP Address: 192.168.0.101;Subnet Mask: 255.255.255.0;Gateway: 192.168.0.1;DHCP Setting: Enabled;User Name: webtc;Password: omega;Web Server: Enabled";Network Security;"Security Implementation: IP address based session manager with username/password login for configuration and control transactions (data is not secured) ;Session Timeout: 5 min with no activity;Username/Password ;Encryption: Base64 (the default web page does not support encryption if Javascript is disabled in the web browser) ;Vulnerabilities: Denial of service attacks, username/password spoofing, script probing and simple decryption";;Ethernet Cable Length, Max: 100 m;Ethernet Port: IEEE 802.3 Ethernet 10Base-T;Configuration Method: TracerDAQ Software;Supported Operating System: Microsoft Windows® VISTA/7/8/10 (32-bit and 64-bit)
- Digital Input Digital: Low = –0.5 to 1.0 Vdc
- Digital I/O Note Number of Digital I/O Channels: 8 Type: CMOS Configuration: Each DIO bit can be independently configured for input or output. Switch selectable output voltages of 5V or 3.3V. Power on reset is input mode unless bit is configured for alarm Pull-Up/Pull-Down Configuration: All pins are connected to 47 kΩ resistors (user configurable for pull-up mode to 5V or pull-down mode) Digital I/O Transfer Rate (Software Paced): Digital Input: 50 port reads or single bit reads per second (typical) Digital Output: 100 port writes or single bit writes per second (typical) Input High Voltage: 4.0V minimum, 5.5V absolute maximum (5V mode); 2.64V minimum, 5.5V absolute maximum (3.3V mode) Input Low Voltage: 1.0V maximum, -0.3V absolute minimum (5V mode); 0.66V maximum, -0.3V absolute minimum (3.3V mode) Output High Voltage: 4.3V minimum (5V mode), 2.7V minimum (3.3V mode); IOH = -2.5 mA Output Low Voltage: 0.6V maximum (IOL = 2.5 mA) Temperature Alarms: 8 (one per digital I/O line);Transfer Rate: Digital Input: 50 port reads or single bit reads per second (typical), Digital Output: 100 port writes or single bit writes per second (typical)
- Electrical Connection Screw Terminal
- Height 36 mm
- Impedance Input 5 GΩ
- Input Type Thermocouple, Digital
- Input Type Note Thermocouple: J, K, T , E, S, R, B, N, RTD: Pt100, Thermistor: 2252Ω
- Input Voltage Note Absolute Maximum Input Voltage: ±25V (Power On), ±40V (Power Off)
- Isolation Power Isolation: 500 Vdc minimum measurement system to PC, Input Isolation: 500 Vdc min between field wiring and USB interface
- Leakage Current 105 nA
- LED Indicators Supply Status LED
- Length 127 mm
- Memory EEPROM: 512 bytes, FLASH: 2 MB
- Microcontroller One high performance 8-bit RISC microcontroller and one highperformance 16-bit RISC microcontroller
- NMRR 90 dB
- Number of Channels, Input Analog: 8 DIFF, Digital: 8
- Operating Temperature, Max 55 °C
- Operating Temperature, Min 0 °C
- Pull-down Resistor 47 kΩ
- Pull-up Resistor 47 kΩ
- Relative Humidity 0 to 90% RH non-condensing
- Sampling Rate 2 Hz (2 updates/second)
- Series ID OM-WEB-TC-Series
- Storage Temperature, Max 85 °C
- Storage Temperature, Min -40 °C
- Supply Power Note Supplied by Included External Power Supply: 5 Vdc ±5%, Supplied by Included External Power Supply: 440 mA maximum, User Output Voltage (5V): 4.65V min to 5.25V maximum
- Supply Voltage 5 Vdc
- Warm Up Time 30 min
- Weight 160 g
- Width 89 mm
- Wire Gauge 30 to 16 AWG
Supported Applications
The Omega OM-WEB-TC Series is an 8-channel web-enabled thermocouple input module designed for data acquisition and remote temperature monitoring. The device features a built-in web server accessible via standard browsers, enabling configuration and real-time status checks over Ethernet networks. It supports industrial applications requiring network integration of temperature sensors with digital I/O capabilities.
Key functional attributes include:
- Built-in cold junction compensation for thermocouple inputs
- Open thermocouple detection (maximum 3 sec response time)
- Digital I/O channels configurable as input or output for alarm signaling
- Included TracerDAQ software for data logging, viewing, and analysis on Microsoft Windows VISTA/7/8/10 (32-bit and 64-bit)
Operating Conditions & Performance
The OM-WEB-TC Series operates within an ambient temperature range of 0 to 55°C (32 to 131°F) with a humidity rating of 0 to 90% RH non-condensing. Storage conditions are specified as -40 to 85°C (-40 to 185°F). The module utilizes screw terminal blocks accepting 16 to 30 AWG wire for sensor and power connections.
Measurement performance is defined by the specific thermocouple type selected, with a resolution of 24-Bit. Accuracy varies across temperature points within each range:
- Type J: -210 to 1200°C (-346 to 2192°F); accuracy ±1.762 typ/±3.098 maximum at -210°C, ±0.724 typ/±1.282 maximum at 0°C
- Type K: -210 to 1372°C (-346 to 2502°F); accuracy ±1.843 typ/±3.318 maximum at -210°C, ±0.799 typ/±1.495 maximum at 1372°C
- Type T: -200 to 400°C (-328 to 752°F); accuracy ±1.797 typ/±3.226 maximum at -200°C, ±0.496 typ/±0.856 maximum at 400°C
- Type E: -200 to 1000°C (-328 to 1832°F); accuracy ±1.708 typ/±3.050 maximum at -200°C, ±0.564 typ/±1.010 maximum at 1000°C
- Type R: -50 to 1768°C (-58 to 3214°F); accuracy ±1.124 typ/±2.010 maximum at -50°C, ±0.347 typ/±0.612 maximum at 1768°C
- Type S: -50 to 1768°C (-58 to 3214°F); accuracy ±1.058 typ/±1.892 maximum at -50°C, ±0.416 typ/±0.734 maximum at 1768°C
- Type B: 250 to 1820°C (482 to 3308°F); accuracy ±2.192 typ/±2.199 maximum at 250°C, ±0.469 typ/±0.471 maximum at 1820°C
- Type N: -200 to 1300°C (-328 to 2372°F); accuracy ±1.897 typ/±3.406 maximum at -200°C, ±0.571 typ/±0.978 maximum at 1300°C
Accuracy values include cold junction compensation measurement error.
Configuration Options
The series is offered as the OM-WEB-TC model, an 8-channel web-enabled thermocouple input module. The device integrates Ethernet connectivity via an RJ-45 connector (10/100 Mbps) compliant with IEEE 802.3 standards.
Connectivity and Network
- Ethernet connection: TCP/IP, HTTP, DHCP, DNS, SNMP protocols supported
- Password protection available; HTTPS optional (requires JavaScript enabled)
- Factory default network settings: IP Address 192.168.1.100, Subnet Mask 255.255.255.0, Gateway 192.168.1.1
Digital I/O and Alarms
- 4 digital I/O channels (CMOS) configurable as input or output
- Up to 8 temperature alarms per device, configurable for high/low limits
- Internal non-volatile memory stores configuration and alarm history; the web interface does not log historical data without TracerDAQ software
Power and Physical Specifications
- Power supply: 10 to 30 VDC (via included 100 to 240 Vac AC adaptor with USA plug)
- Dimensions: 127 L x 89 W x 36 mm D (5.0 x 3.5 x 1.4")
- Weight: 160 g (5.6 oz)
Key Product Differences
The OM-WEB-TC Series is distinct from the related OM-WEB-TEMP family, which supports RTD, thermistor, and semiconductor sensor inputs rather than thermocouples. The OM-WEB-TC specifically targets 8-channel thermocouple applications with types J, K, T, E, N, R, S, and B.
Software variations include the standard TracerDAQ application for basic data logging and viewing, or the optional TracerDAQ Pro software (SWD-TRACERDAQ-PRO) which supports up to 48 channels, advanced triggering options, math functions, and waveform generation capabilities. The hardware module itself remains consistent across these software tiers.
PDFs & Manuals
Software & Drivers