Omega Products OM-WEB-TC User Manual

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Eight Channel Web-Enabled Thermocouple Input Module

OM-WEB-TC

⻬ Built-In Web Server
⻬ 8 Thermocouple

Input Channels

⻬ Supports Types J, K, T, E, N, R,

S, B Thermocouples

⻬ Built-In Cold Junction

Compensation and Open
Thermocouple Detection

⻬ 24-Bit Measurement System
⻬ 8 Digital I/O–User

Configurable for Alarms

⻬ Free Software Included

OM-WEB-TC, shown

smaller than actual size.

The OM-WEB-TC is a thermocouple
measurement device with built-in
web server. Simply connect the
device to an Ethernet port or hub
and view current data using a
standard web browser.

The OM-WEB-TC’s embedded web
interface provides access to current
data and configuration settings
using a standard web browser.
Browse to the device’s home page
by entering the URL that is printed
on the device into the browser.
View current thermocouple
measurements and channel data,
and configure hardware options
from the device’s home page. Only
one user can change configuration
options on the device at a time.
The web interface is built into the
device’s firmware, and does not
need to be installed on a computer.
No external software is required
other than a web browser and a
TCP/IP connection. Connect the
device’s 10Base-T Ethernet port to
a local or wide area network using
the supplied ethernet cable, to a
single computer through a hub
using the supplied ethernet cable, or
directly to a computer using a
standard CAT-5 crossover cable.
The web browser used to access
the OM-WEB-TC’s web interface
must support JavaScript.

The OM-WEB-TC provides
8 thermocouple channels and
8 digital I/O channels. The included
external power supply (ac adaptor)
is used to provide power. On-board
LEDs display the status of
communications and external
power. All hardware configurable
options are selectable with the web
browser or the included Instacal
utility software. Network
configurable options are settable
using Instacal. When using Instacal,
if the login settings have been
changed from the default, a login
name and password are required to
change the configuration settings.

The OM-WEB-TC provides
8 differential thermocouple input
channels. A 24-bit analog-to-digital
(A/D) converter is provided for each
pair of analog inputs. Thermocouple
types J, K, T, E, N, R, S, B are
supported. The thermocouple type
is software programmable for each
channel. Four cold junction
compensation (CJC) sensors are
provided for thermocouple
measurements. Each CJC sensor is
dedicated to two thermocouple input
channels. An open thermocouple
detection feature lets you detect a
broken thermocouple. An on-board
microprocessor automatically
linearizes the measurement data.

To Order, Call or Shop Online at omega.com

The OM-WEB-TC features
8 independent temperature alarms,
Each alarm controls an associated
digital I/O channel as an alarm
output. The input to each alarm is
one of the temperature input
channels, the output of each alarm
is software configurable as an
active high or low. The user
configurable threshold conditions
activate each alarm. When an
alarm is activated, the associated
DIO channel is driven to the active
output state selected.

Eight digital I/O channels are
provided to communicate with
external devices and to generate
alarms. The digital bits are software
programmable for input or output.
The digital output voltage is switch­selectable for 3.3V or 5V logic. A
screw terminal is provided for
pull-up or pull-down configuration.

The OM-WEB-TC web interface
displays current data read from the
device and does not log or store
historical data. Use the included
TracerDAQ software to log or
graphically trend your data.

The OM-WEB-TC module ships with
an impressive array of software,
including the new TracerDAQ

®

, a
full-featured, out-of-the-box data
logging, viewing, and analysis

SM

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application; Universal Library™; ULx
for NI LabVIEW (comprehensive
library of VIs and example programs
compatible with 32- and 64-bit
LabVIEW v8.5 through 2011) and
InstaCal™ installation, calibration,
and test utility–powerful software
solutions for programmers and
nonprogrammers alike. These
modules operate under Microsoft
Windows XP/VISTA/7
(32-bit and 64-bit) operating systems.

The OM-WEB-TC 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

SWD-TRACERDAQ-PRO, $220, sold separately, is an enhanced
version of TracerDAQ. A comparison of some of the features included
in TracerDAQ vs TracerDAQ PRO are shown below.

Features Comparison

Strip Chart

Features TracerDAQ TracerDAQ Pro

Channel Types digital input, event counter digital input, event counter
Number of Channels 8 48
Number of Lanes 28
Maximum Samples per Channel 32,000 1 million
Alarm Conditions No Yes
Measurements Window No Yes
Enter Annotations No Yes
Software Triggering No Yes
Hardware Triggering No Yes
Time-of-Day Triggering No Yes
Linear Scaling No Yes

Analog input, temperature input, Analog input, temperature input,

Oscilloscope

Features TracerDAQ TracerDAQ Pro

Channel Type Analog input Analog input
Number of Channels 24
Measurements Window No Yes
Reference Channel No Yes
Math Channel No Yes

Rate Generator

Features TracerDAQ

TracerDAQ Pro

Channel Type Counter output Counter output
Number of Channels 1 20

Function Generator

Features TracerDAQ TracerDAQ Pro

Channel Type Analog output Analog output
Number of Channels 1 16
Waveform Types Sine Sine, square, triangle, flat, pulse, ramp, random, arbitrary
Duty Cycle No Yes
Phase No Yes
Gate Ratio No Yes
Rate Multiplier No Yes
Sweep (Linear and Exponential) No Yes

Specifications

ANALOG INPUTS
A/D Converter: Four dual 24-bit

sigma delta A/D converters
Input Isolation: 500 Vdc min
between field wiring and
USB interface
Number of Channels: 8 differential
thermocouple inputs

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To Order, Call or Shop Online at omega.com

Differential Input Voltage Range:

±0.080V

Absolute Maximum Input Voltage:

±25V (power on), ±40V (power off)
Throughput Rate: 2 samples/sec

max for all active channels

Input Impedance: 5 GΩ min

Input Leakage Current: 105 nA

max (with open thermocouple
detection enabled)

Normal Mode Rejection Ratio:

90 dB min

Common Mode Rejection Ratio:

100 dB min
Warm-Up Time: 30 minutes max

SM