Omega Products OM-WEB-TEMP User Manual

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Eight Channel Web-Enabled
Temperature Measurement
Module

OM-WEB-TEMP

⻬ Built-In Web Server
⻬ 8 Differential Input Channels
⻬ Supports Thermocouples

(Types J, K, T, E, N, R, S, B),
RTDs, Thermistors and
Semiconductor
Temperature Sensors

⻬ Built-In Cold Junction

Compensation and Open
Thermocouple Detection

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

Configurable for Alarms

The OM-WEB-TEMP is a
temperature 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-TEMP’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 sensor
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-TEMP’s web interface
must support JavaScript.

To Order, Call or Shop Online at omega.com

OM-WEB-TEMP
shown smaller than
actual size.

The OM-WEB-TEMP provides
8 temperature 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
InstaCalTMutility 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-TEMP provides 8
differential input channels that are
software programmable for different
sensor types including:

• Thermocouple Types J, K, T, E,
R, S, B, N

• RTD–2, 3 or 4-wire Pt100 RTDs

• 2-, 3- or 4-wire thermistor
measurements

• Semiconductor temperature
sensors–LM36 or equivalent

The OM-WEB-TEMP provides a
24-bit analog-to-digital (A/D)
converter for each pair of differential
analog input channels. Each pair of
differential inputs constitutes a
channel pair. A different type of
sensor (i.e., thermocouple, RTD,
thermistor or semiconductor) can be
connected to each channel pair,
however both channels in the
channel pair need to be the
same sensor type (although if

thermocouples are connected it is
possible to mix thermocouple types).

The OM-WEB-TEMP provides four
integrated cold junction
compensation (CJC) sensors for
thermocouple measurements and
built-in current excitation sources for
resistive sensor measurements,
Each CJC sensor is dedicated to
one of the four channel pairs. An
open thermocouple detection
feature allows detection of a broken
thermocouple. An onboard
microprocessor automatically
linearizes the measurement data.

The OM-WEB-TEMP 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.

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

®

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

The OM-WEB-TEMP 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 TracerDQ PRO is shown below.

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.

Specifications

ANALOG INPUTS
A/D Converter: 4 dual 24-bit

sigma delta A/D converters

Input Isolation:

field wiring and USB interface
Number of Channels: 8 differential
temperature inputs

Differential Input Voltage Range:

Thermocouple, ±0.080V

RTD: 0 to 0.5V
Thermistor: 0 to 2V
Semiconductor: 0 to 2.5V

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
Thermocouple Input: Software

programmable for type J, K, T, E,
R, S, B, N

Open Thermocouple Detection:

3 sec open detection time (max)

CJC Sensor Accuracy:

-0.75 to 0.5°C max (15 to 35°C);

-1.5 to 1.25°C max (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 equivalent

2

To Order, Call or Shop Online at omega.com

500 Vdc min between

Features Comparison

Strip Chart

Feature TracerDAQ TracerDAQ PRO

Channel Types

Number of Channels
Number of Lanes
Maximum Samples

Per Channel
Alarm Conditions
Measurements Window
Enter Annotations
Software Triggering
Hardware Triggering
Time-of-Day Triggering
Linear Scaling

Oscilloscope

Feature 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

Function Generator

Feature TracerDAQ TracerDAQ PRO
Channel Type Analog output Analog output
Number of Channels 1 16

Waveform Types Sine

Duty Cycle No Yes
Phase No Yes
Gate Ratio No Yes
Rate Multiplier No Yes
Sweep (Linear and

Exponential) No Yes

Rate Generator

Feature TracerDAQ TracerDAQ PRO
Channel Type Counter output Counter output
Number of Channels 1 20

Analog input, temperature Analog input, temperature

input, digital input, input, digital input,

event counter event counter

8 48
28

32,000 1 milllion

No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes

Sine, square, triangle,

flat, pulse, ramp,

random, arbitrary

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