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OM-WEB-TEMP-Series
8-Channel Web-Enabled Temperature Measurement Module
- Built-In Web Server
- 8 Differential Input Channels
- Supports Thermocouples (Types J, K, T, E, N, R, S, B), RTDs, Thermistors and Semiconductor Temperature Sensors
- Built-In Cold Junction Compensation and Open Thermocouple Detection
Product Overview
- Accuracy ± 0.75 °C
- Alarm Note 8 (one per digital I/O line)
- 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);Pt100 RTD Input: 2-, 3- or 4-wire DIN 43760, alpha = 0.00385, SAMA, alpha = 0.003911, ITS-90/IEC751, alpha = 0.0038505 (3- or 4-wire connections take up 2 differential channels);Thermistor Input: 2-, 3- or 4-wire standard 2252 through 30,000 Ω (3- or 4-wire connections take up 2 differential channels);Semiconductor Sensor: TMP36 or equivalen;
- CMRR 100 dB
- Configuration Parameters Pull-Up/Down Configuration, Switch-Selectable Output Voltage, User-Configurable Input/Output
- 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: InstaCalTM utility software, 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)
- Digital Output 4.3V
- Electrical Connection Screw Terminal
- Height 36 mm
- Impedance Input 5 GΩ
- Input Configuration Connected Software
- Input Type Thermocouple, RTD, Thermistor, Diode, Digital
- Input Type Note Thermocouple: J, K, T , E, S, R, B, N, RTD: Pt100, Thermistor: 2252Ω, Semiconductor: TMP36
- 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-TEMP-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-TEMP Series consists of web-enabled temperature measurement modules designed for data acquisition and remote monitoring. The series supports industrial applications requiring network integration via Ethernet (TCP/IP) to monitor temperatures from thermocouples, RTDs, thermistors, or semiconductor sensors. Devices feature a built-in web server accessible through standard browsers for configuration and real-time viewing.
Operating Conditions & Performance
The OM-WEB-TEMP module operates within an ambient temperature range of 0 to 55°C (32 to 131°F) with humidity up to 90% RH non-condensing. Storage temperatures are rated from -40 to 85°C (-40 to 185°F). The unit utilizes a 24-bit measurement system and supports throughput rates of up to 100 samples per second per channel.
Measurement ranges vary by sensor type:
- Thermocouples (Types J, K, T, E, N, R, S, B): -210 to 1820°C (-346 to 3308°F) depending on the specific type.
- RTD (Pt100): -200 to 600°C (-328 to 1112°F).
- Semiconductor Sensor: -40 to 150°C (-40 to 302°F) for TMP36 or equivalent.
- Thermistor: Resistance ranges from 2252 Ω to 30,000 Ω with temperature capabilities spanning -40 to 120°C depending on the specific resistance value.
Accuracy specifications are defined by sensor type and range. For example, Type K thermocouples show a maximum error of ±3.318 at -210°C and ±1.495 at 1372°C. RTD measurement accuracy ranges from ±0.124 to ±0.150 typical error across the operating span.
Configuration Options
The series is configured as an 8-channel module with differential inputs and includes 8 digital I/O channels configurable for alarms or general input/output functions. The device connects via a standard RJ-45 Ethernet port (10/100 Mbps) supporting TCP/IP, HTTP, DHCP, DNS, and SNMP protocols.
Key configuration options include:
- Sensor Inputs: Supports 2-, 3-, or 4-wire RTDs; various thermistor configurations (NTC/PTC); semiconductor sensors (LM36/TMP36 equivalent); and multiple thermocouple types.
- Digital I/O: Up to 8 alarms per device configurable for high/low limits, utilizing the digital channels.
- Power Supply: Requires 5 Vdc ±5%, supplied by an included external power adapter (100 to 240 Vac).
- Data Logging & Software: Ships with TracerDAQ software for data logging and analysis; supports internal non-volatile memory for configuration and alarm history. An upgrade path exists to TracerDAQ PRO.
Key Product Differences
The OM-WEB-TEMP Series is distinct from the related OM-WEB-TC series in its channel configuration: while both are 8-channel web-enabled modules, the OM-WEB-TEMP supports RTD, thermistor, and semiconductor sensor inputs alongside thermocouples. The manual notes that the OM-WEB-TC model is configured specifically for 8 thermocouple channels.
Physical dimensions for the module are listed as 127 L x 89 W x 36 mm D (5.0 x 3.5 x 1.4") with a weight of 160 g (5.6 oz). The enclosure utilizes screw terminal blocks accepting 16 to 30 AWG wire for sensor inputs, power, and digital I/O connections.
PDFs & Manuals
Software & Drivers