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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DIGITAL I/O
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 pulldown 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 min,
5.5V absolute max (5V mode);
2.64V min, 5.5V absolute max
(3.3V mode)
Input Low Voltage: 1.0V max,
-0.3V absolute min (5V mode);
0.66V max, -0.3V absolute min
(3.3V mode)
Output High Voltage: 4.3V min
(5V mode), 2.7V min (3.3V mode);
IOH = -2.5 mA
Output Low Voltage: 0.6V max
(IOL = 2.5 mA)
Temperature Alarms: 8 (one per
digital I/O line)
Semiconductor Sensor
Measurement Accuracy
Temperature Maximum
Sensor Type Range Error
TMP36 or -40 to 150°C ±0.50°C
equivalent (-40 to 302°F)
Compatible Thermocouple Input Types
Type Temperature Range Accuracy (°C)
-210 to 1200°C (-346 to 2192°F) ±0.724 typ, ±1.282 max (0°C)
-210 to 1372°C (-346 to 2502°F) ±0.730 typ, ±1.292 max (0°C)
-200 to 400°C (-328 to 752°F) ±0.754 typ, ±1.334 max (0°C)
-200 to 1000°C (-328 to 1832°F) ±0.826 typ, ±1.465 max (0°C)
-50 to 1768°C (-58 to 3214°F) ±0.475 typ, ±0.844 max (250°C)
-50 to 1768°C (-58 to 3214°F) ±0.479 typ, ±0.853 max (250°C)
250 to 1820°C (482 to 3308°F) ±0.821 typ, ±0.824 max (700°C)
-200 to 1300°C (-328 to 2372°F) ±0.735 typ, ±1.300 max (0°C)
Includes CJC measurement error.
*
±1.762 typ, ±3.098 max (-210°C)
±0.684 typ, ±1.178 max (1200°C)
±1.843 typ, ±3.318 max (-210°C)
±0.799 typ, ±1.495 max (1372°C)
±1.797 typ, ±3.226 max (-200°C)
±0.496 typ, ±0.856 max (400°C)
±1.708 typ, ±3.050 max (-200°C)
±0.564 typ, ±1.010 max (1000°C)
±1.124 typ, ±2.010 max (-50°C)
±0.347 typ, ±0.612 max (1768°C)
±1.058 typ, ±1.892 max (-50°C)
±0.416 typ, ±0.734 max (1768°C)
±2.192 typ, ±2.199 max (250°C)
±0.469 typ, ±0.471 max (1820°C)
±1.897 typ, ±3.406 max (-200°C)
±0.571 typ, ±0.978 max (1300°C)
Thermistor Measurement Accuracy
Thermistor Temperature Range Error (°C) Error (°C)
°C (-40°F) ±0.0007 ±0.001
-40
2252 Ω
5000 Ω
10000 Ω
30000 Ω
0°C (32°F) ±0.008 ±0.021
50°C (122°F) ±0.130 ±0.263
120°C (248°F) ±1.750 ±3.473
°C (-31°F) ±0.0006 ±0.001
-35
0°C (32°F) ±0.004 ±0.009
50°C (122°F) ±0.049 ±0.115
120°C (248°F) ±0.658 ±1.535
°C (-13°F) ±0.0005 ±0.001
-25
0°C (32°F) ±0.002 ±0.005
50°C (122°F) ±0.028 ±0.060
120°C (248°F) ±0.328 ±0.771
°C (14°F) ±0.0005 ±0.001
-10
0°C (32°F) ±0.001 ±0.002
50°C (122°F) ±0.009 ±0.019
120°C (248°F) ±0.128 ±0.267
Typical Maximum
RTD Measurement Accuracy
Temperature Range Error (°C) Error (°C)
-200°C (-328°F) ±2.784 ±2.913
-150°C (-238°F) ±1.070 ±1.201
-100°C (-148°F) ±0.349 ±0.482
OM-WEB-TEMP
shown smaller than
actual size.
0°C (32°F) ±0.124 ±0.261
100°C (212°F) ±0.127 ±0.269
300°C (572°F) ±0.136 ±0.287
600°C (1112°F) ±0.150 ±0.318
To Order, Call or Shop Online at omega.com
Typical Maximum
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NETWORK
Extended Warranty
Program
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Ethernet Compliance
Ethernet Connection
Network Factory Default Settings
Network Protocols
Network Security
4
Device Type: IEEE 802.3
Ethernet 10Base-T
Device Compatibility: IEEE
802.3-2003 10 Mpbs Media
Access Control
Ethernet Type: 10Base-T
Connector: RJ-45, 8 position
Cable: CAT-5 shielded,
unshielded twisted pair
Length: 100 m (328') max
MAC Address: 00:12:71:Cx:xx:xx
where xxxxx is the device’s serial
number
IP Address: 192.168.0.101
Subnet Mask: 255.255.255.0
Gateway: 192.168.0.1
DHCP Setting: Enabled
User Name: “webtemp”
Password: “omega”
Web Server: Enabled
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:
“webtemp_xxxxx”, where xxxxx is
the device’s serial number
Max Number of Simultaneous
HTTP Connections: 3
Max Number of Non-HTTP TCP
Sockets: 5
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
To Order, Call or Shop Online at omega.com
GENERAL
Memory: EEPROM (512 bytes for
sensor configuration); FLASH (2 MB
for device configuration and website
storage)
Microcontroller: One 8-bit and one
16-bit RISC high-performance
microcontroller
Power Supply Voltage (Supplied
by Included External Power
Supply): 5 Vdc ±5%
Power Supply Current (Supplied
by Included External Power
Supply): 440 mA max
Excitation Current for Resistance
Sensors: RTD, 210 uA ±5% typ;
thermistor, 10 uA ±5% typ
Dimensions:
127 L x 89 W x 36 mm D
(5.0 x 3.5 x 1.4")
Input Connections: Screw terminal
blocks (accept 16 to 30 AWG wire)
Operating Temperature: 0 to 55°C
(32 to 131°F), 0 to 90% RH
non-condensing
Storage Temperature: -40 to 85°C
(-40 to 185°F)
Weight: 160 g (5.6 oz)
User Output Voltage (5V):
4.65V min to 5.25V max
(10 mA max)
OM-WEB-TEMP,
shown smaller than
actual size.
Laptop not included.
OMEGACARESMextended warranty
program is available for models shown on
this page. Ask your sales respresentative
for full details when placing an order.
OMEGACARESMcovers parts, labor and
equivalent loaners.
AVAILABLE FOR FAST DELIVERY!
To Order Visit omega.com/om-web-temp for Pricing and Details
Model No. Description
OM-WEB-TEMP 8-channel web-enabled temperature
SWD-TRACERDAQ-PRO TracerDAQ Pro software
Comes complete with an ethernet cable, 100 to 240 Vac ac adaptor with USA plug, quick start
guide, software and operator’s manual on CD.
Ordering Example: OM-WEB-TEMP, 8-channel web-enabled temperature measurement
module and OCW-1 OMEGACARESM1 year extended warranty ($59) adds 1 year to standard
1 year warranty.
measurement module
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