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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
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 switchselectable
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 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
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: 500 Vdc min 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
max for all active channels Input Impedance:v 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, α = 0.00385, SAMA, α
= 0.003911, ITS-90/IEC751, α =
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
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 Ω
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)
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') max 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 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 User Output Voltage (5V):
4.65V min to 5.25V max (10 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 Weight: 160 g
† All amounts shown in EUR, GBP, or USD Note: Comes complete with an ethernet cable, 100 to 240 Vac ac adaptor, quick start guide, software and operator’s manual on CD.
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