Omega OM-WEB-TEMP Specification

Eight Channel Web-Enabled
Temperature Measurement Module

OM-WEB-TEMP

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

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

U Built-In Cold Junction

Compensation and Open
Thermocouple Detection

U 24-Bit Measurement System
U 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.

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

OM-WEB-TEMP
shown smaller than
actual size.

and external power. All hardware
configurable options are selectable
with the web browser or the included
InstaCalTM 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-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 switch-

selectablefor3.3Vor5Vlogic.A

screw terminal is provided for
pull-up or pull-down configuration.

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 TracerDAQ®, a full-featured,
out-of-the-box data logging, viewing,
and analysis application. Driver
support and detailed example
programs are included for Universal
Library programming libraries
for Microsoft® Visual Studio®
programming languages, and other
languages, including DASYLab®, and
ULx for NI LabVIEW® (comprehensive
library of VIs and example programs

compatiblewith32-bitand64­bitLabVIEW2010orlater)and

InstaCalTM installation, calibration

1

and test utility-powerful solutions for
programmers and nonprogrammers
alike. These modules operate under
Microsoft Windows® VISTA/7/8/10

(32-bitand64-bit)operatingsystems.

The OM-WEB-TEMP data acquisition
module 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

Specifications

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

sigma delta A/D converters

Input Isolation:

between

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
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
Thermocouple Input: Software

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

500 Vdc minimum

TracerDAQ Strip Chart.

TracerDAQ PRO is an enhanced
version of TracerDAQ and is
available as a purchased upgrade
(SWD-TRACERDAQ-PRO).

A comparison of some of the
features included in TracerDAQ vs
TracerDAQ PRO is shown below.

TracerDAQ Pro Strip Chart

with Measurements.

Features Comparison

Strip Chart

Feature TracerDAQ TracerDAQ PRO

Channel Types

input, digital input, input, digital input,
event counter event counter

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 2  4
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

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

Rate Generator

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

Analog input, temperature Analog input, temperature

8  48

2  8

No Yes

No Yes

No Yes

No Yes

No Yes

No Yes

No Yes

32,000  1milllion

Sine, square, triangle,

2

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 maximum

(3.3Vmode)

Input Low Voltage: 1.0V maximum,

-0.3Vabsolutemin(5Vmode);0.66V
max,-0.3Vabsoluteminimum(3.3V

mode)

Output High Voltage:4.3Vminimum
(5Vmode),2.7Vmin(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)

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)

±1.762typ,±3.098max(-210°C)

  -210to1200°C(-346to2192°F) ±0.724typ,±1.282max(0°C)
±0.684typ,±1.178max(1200°C)

±1.843typ,±3.318max(-210°C)
  -210to1372°C(-346to2502°F) ±0.730typ,±1.292max(0°C)
±0.799 typ, ±1.495max(1372°C)

±1.797 typ, ±3.226max(-200°C)
  -200to400°C(-328to752°F) ±0.754typ,±1.334max(0°C)

±0.496typ,±0.856max(400°C)
±1.708 typ, ±3.050max(-200°C)

  -200to1000°C(-328to1832°F) ±0.826typ,±1.465max(0°C)
±0.564typ,±1.010 max (1000°C)

±1.124typ,±2.010max(-50°C)
  -50to1768°C(-58to3214°F) ±0.475typ,±0.844max(250°C)
±0.347typ,±0.612max(1768°C)

±1.058 typ, ±1.892max(-50°C)
  -50to1768°C(-58to3214°F) ±0.479typ,±0.853max(250°C)
±0.416typ,±0.734max(1768°C)

±2.192typ,±2.199max(250°C)
  250to1820°C(482to3308°F) ±0.821typ,±0.824max(700°C)

±0.469typ,±0.471max(1820°C)
±1.897 typ, ±3.406max(-200°C)

  -200to1300°C(-328to2372°F) ±0.735typ,±1.300max(0°C)
±0.571 typ, ±0.978max(1300°C)

Includes CJC measurement error.

*

Thermistor Measurement Accuracy

Typical Maximum

Thermistor Temperature Range Error (°C) Error (°C)

0
50°C(122°F) ±0.130 ±0.263

  120°C(248°F) ±1.750 ±3.473

0
50°C(122°F) ±0.049 ±0.115

  120°C(248°F) ±0.658 ±1.535

0°C(32°F) ±0.002 ±0.005
50°C(122°F) ±0.028 ±0.060

  120°C(248°F) ±0.328 ±0.771

0°C(32°F) ±0.001 ±0.002
50°C(122°F) ±0.009 ±0.019

  120°C(248°F) ±0.128 ±0.267

 -40

2252Ω

 -35°C(-31°F) ±0.0006 ±0.001

5000 Ω

 -25°C(-13°F) ±0.0005 ±0.001

10000 Ω

-10°C(14°F) ±0.0005 ±0.001

30000Ω

°C(-40°F) ±0.0007 ±0.001

°C(32°F) ±0.008 ±0.021

°C(32°F) ±0.004 ±0.009

OM-WEB-TEMP
shown smaller than
actual size.

RTD Measurement Accuracy

Typical Maximum
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
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

3

NETWORK
Ethernet Compliance

Device Type:IEEE802.3 
Ethernet 10Base-T

Device Compatibility: IEEE

 802.3-200310MpbsMedia 

Access Control

Ethernet Connection

Ethernet Type: 10Base-T
Connector: RJ-45,8position
Cable: CAT-5 shielded,

unshielded twisted pair
Length:100m(328')maximum
MAC Address:00:12:71:Cx:xx:xx

where xxxxx is the device’s serial
number

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: “webtemp”
Password: “omega”
Web Server: Enabled

Network Protocols

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
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

GENERAL
Memory:EEPROM(512bytesfor

sensorconguration);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maximum

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maximum
(10 mA maximum)

OM-WEB-TEMP,
shown smaller than
actual size.

SM

Laptop not included.

Extended Warranty

Program

OMEGACARESM extended warranty

program is available for models shown on

this page. Ask your sales respresentative

for full details when placing an order.

OMEGACARESM covers parts, labor and

equivalent loaners.

To Order

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 OMEGACARESM 1 year extended warranty adds 1 year to standard 1 year
warranty.

measurement module

4