Omega Products iNET-240 User Manual



Expandable Modular Data Acquisition System
iNET-400 Series

iNET-555

$

990

Complete Starter

System

⻬ USB 2.0 High Speed Data

Acquisition Hardware for
Windows®≥XP SP2, Vista
or 7 (XP/VS/7)

⻬ Analog and Digital Input

and Outputs

⻬ Free instruNet World Software
⻬ Directly Connects to

Thermocouple, RTD,
Thermistor, Strain Gage,
Load Cell, Voltage,
Current, Resistance and
Accelerometer Input’s

⻬ Reduce Noise by Placing

Boxes Near Sensors and
up to 1000' From Noisy
Computer

⻬ Digitize Any Combination

of Channels at 166,000
Samples Per Second Aggregate

⻬ Each Channel has

Independently Programmable
Analog Filters, Integration
Time, Voltage Range, and
Sample Rate; Programmable
Digital Filters on All Channels
(LP, HP, BP, BS)

The iNET-400 system is a low cost
card cage that attaches to Windows
computers via USB 2.0. The
advantage of a card cage is that you
can select which I/O modules to
install as needed to build a
customized system. The instruNet
card cage typically has one A/D
measurement module and
additional modules provide signal
conditioning. The conditioned
analog signal is routed to the A/D
module via the backplane.

To Order, Call or Shop Online at omega.com

Shown smaller
than actual size.

iNET-400 card
cage, $390.

This is dramatically different from
comparable systems which place
A/D measurement electronics on
each module. The advantage of the
iNET-400 topology is cost. After the
1st module is installed, additional
iNET-400 channels are conditioned
at a very low cost per channel.

iNET-400 measurement modules
have universal inputs that enable
one to directly connect each channel
to one of: thermocouple, thermistor,
strain gage, load cell, counter/timer,
RTD, voltage, current, resistance and
accelerometer.

Absolute accuracy for all of these
sensor types is specified. In some
cases, the end user adds an external
shunt resistor. The advantage of
universal inputs is cost.

Low Cost 4/8/12/16-Slot
Card Cages

The iNET-400 card cage provides
4 slots, and multiple iNET-400’s
can be bolted together by the end
user, side-by-side, to create an
8, 12, or 16 slot system. In many
applications, one iNET-400
with 4 slots is sufficient.

iNET-410, $190.

4/8/12/16-slot card cages

4 slots

8 slots

12 slots

16 slots

iNET-430, $490.

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Connect Directly to Common Sensors

Data acquisition cards connect directly to
thermocouple, thermistor, strain gage, load cell,
counter/timer, RTD, voltage, current, resistance and
accelerometer.

Voltage

Resistance

Current

Strain Gage

RTD

Thermistor

The iNET-400 card cage is 15 D x 11 W x 14 cm H
(6 x 4.5 x 5.6") in size. The slots are numbered such
that #1 is the left-most slot, #2 is to the right of #1, and
so forth and so on. Cards are held into position with
jackscrews that are tightened with a slotted
screwdriver. Slot #1 is a special slot and is used to
interface to a computer.

The iNET-410 card slides into slot #1 and then cables
to the computer via a DB25 cable that connects to an
instruNet controller. Also, an iNET-300 Power Adaptor
cable is used to route power from an iNET-312-8
desktop power supply to the iNET-410 interface card
in slot #1, which in turn routes that power to the card
cage backplane (i.e. pcb at back of card cage that
attaches to all cards). This is illustrated in the below
diagram.

The iNET-400 Card Cage needs at least one
iNET-430 A/D card if analog voltages are to be
measured. The iNET-430 cards includes an A/D
converter and serves this purpose.

The iNET-420 and iNET-423 cards contain various
signal conditioning circuits and route signals along the
backplane to the iNET-430 for measurement. This
happens automatically and does not require
programmer intervention, other than insertion of cards
and attaching end user signals to the card’s front
panel connectors.

Windows PC

iNET-300 cable
(included with iNET-312-8)

iNET-240

110 to 220 Vac

Thermocouple

iNET-312-8
Power supply

i410

i430

2

To Order, Call or Shop Online at omega.com

SM

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iNET-240 instruNet DSP Card

Each instruNet Network is controlled by an instruNet
DSP controller card that attaches to a Microsoft
Windows computer. The iNET-240 attaches to a free
USB 2.0 high speed port (requires Windows ≥ XP
Sp2). Each Controller is an independent computer in
itself that utilizes a powerful 32-bit DSP processor and
onboard RAM to control all aspects of data acquisition
along its network. All real-time tasks are off-loaded to
this processor, therefore the host computer is not
burdened with real-time issues. Between 1 and 4
controllers can be installed, space permitting, since
each controller operates independently.

Connect up to 8 iNET-400 Card Cages

Each instruNet network supports up to 8 instruNet
iNET-400 card cages.

instruNet Network

These devices are connected in a daisy-chain
configuration to form a chain of Devices. Each network
can be up to 300 meters long. All networks are
anchored with an instruNet Terminator at the far end,
and an instruNet Controller at the near end. This
makes instruNet a cost effective method for designing
large scale, high speed, multi-channel data acquisition
systems.

iNET-240, $290,
USB controller,
shown smaller
than actual size

instruNet terminator

iNET-400

card cage

Windows PC

DB-25 connector (male)

iNET-240
instruNet

controller

DB-25 cable DB-25 connector (female)

iNET-400

card cage

instruNet Version ≥ 3.0 software
requires Windows XP, Vista, or 7
(XP/VS/7) computer with at least

Summary of Computers
Compatible with instruNet

Controller

Model No. Type Size Computer Required

iNET-240 USB 2.0 4 x 2 x 1" 32-bit or 64-bit Windows ≥ XP SP2,

Vista or 7 (XP/VS/7) Computer with
1 available USB 2.0 High Speed
port (480Mbaud).

256MB of RAM Memory and at least
256 MB of free disk space. The
iNET-240 USB controller requires
32-bit or 64-bit Windows XP SP2
(service pack #2) or newer.
instruNet ≥ v3.0 software does not
run under Linux, does not run on
Windows 95/98/Me/Nt/2K
computers and does not run on
Macintosh computers.

To Order, Call or Shop Online at omega.com

SM

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iNET-400 Series Data Acquisition Cards

iNET-410, $190.

iNET-420, $360.

iNET-423, $490.

iNET-410 Communications Card

The iNET-410 communications card connects an
iNET-400 card cage to a Windows computer via an
instruNET iNET-240 USB controller. The iNET-410
plugs into the left-most slot (slot #1) of an iNET-400
card cage. One and only one iNET-410 is required per
iNET-400 card cage when working with instruNet
controllers. The iNET-410 provides the following
features:

• Two DB25 connectors allow daisy-chaining multiple
iNET-400 card cage devices to one instruNet
controller card.

• Front panel red power light shows presence of 5V,
12V and -12V power.

• Front panel green I/O light blinks when computer
communicates with card cage.

• Includes one DB25 male to female 3 m (10') cable.

iNET-420 Analog I/O Module

The iNET-420 provides 20 single-ended (SE)/10
differential (DI) voltage input channels and 4 universal
digital I/O (20 mA sink, -10V to 30V) and requires the
iNET-430 A/D module to measure voltages. The iNET­420 connects directly to voltage, thermocouple,
thermistor, RTD, load cell, strain gage, potentiometer,
current and resistance inputs.

iNET-430, $490. iNET-460, $360.

iNET-423 Analog I/O Module

The iNET-423 provides 6 differential (DI) voltage
input channels, 4 universal digital I/O (20 mA sink,

-10 to 30V) and requires the iNET-430 A/D module
to measure voltages. The iNET-423 connects directly
to voltage, thermocouple, thermistor, RTD, load cell,
strain gage, potentiometer, current and resistance
inputs. Each input channel passes through it’s own
amplifier with a software selectable gain of 1 or
64 and optional low pass filter.

iNET-430 A/D Module

The iNET-430 provides 16 single-ended (SE)/8
differential (DI) voltage input channels with a 16-bit
A/D converter, 2 precision analog voltage outputs
(±10V, 14-bit D/A), 2 analog voltage outputs
(0 to 10 V output, 8-bit D/A) and 4 universal digital
I/O (20 mA sink, -10 to 30 V). The iNET-430 connects
directly to voltage, thermocouple, thermistor, RTD,
load cell, strain gage, potentiometer, current and
resistance inputs.

iNET-460 Digital I/O Module

The iNET-460 provides 12 universal digital I/O
(20 mA sink, -10 to 30 V) and 16 digital I/O
(200 mA sink, -10 to 30 V).

iNET-400 cards are installed by the end user into an instruNET card cage that is 4, 8, 12 or 16 slots
wide. Each card is 13 x 2.5 x 13 cm (5.1 x 1.0 x 5.1") in size. Below is a list of available cards.

Voltage Input Voltage Outputs Digital I/O

Number of Low Pass Number of Number of mA

Model No. Channels Range (KHz) Channels Range Channels Sink

iNET-420 20SE/10DI ±10V.. 4 20

±20mV

iNET-423 6DI ±5V.. 0.006,4 4 20

±5mV

iNET-430 16SE/8DI ±10V.. 2 ±10V.. 4 20

±10mV 2 0-10V

iNET-460 12 20

16 200

iNET-410

4

To Order, Call or Shop Online at omega.com

The iNET-410 connects card cage to windows computer via an instruNet controller.

SM

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The following table shows maximum aggregate sample rates for an iNET-240 USB controller attached to an
iNET-400 card cage. To calculate the sample rate for each channel, divide by the number of channels attached to
the iNET-240 controller. For example, if the maximum aggregate sample rate is 166K samples/sec/controller, and
you digitize 4 channels, then you could digitize each channel at 41Ks/sec/channel. Up to four iNET-240 controllers
can be attached to a computer to increase total system throughput.

Max Aggregate Sample Rate per Controller (K samples/sec/controller)

±10mV..

Model No. ±10V Range ±5V Range ±1.2V Range ±80mV Range

iNET-430 166 166 129 1.4
iNET-430 90 90 83 1.4
iNET-423 113 113 98 68

Sensor Connection Table

The table below shows which sensors directly connect to each hardware product. The numbers in the table
refer to number of channels. The following sensors require an external shunt resistor: RTD, thermistor,
resistance measurement, current measurement, 1/4 bridge strain gage, and 1/2 bridge strain gage.
Thermocouple sensors require an iNET-510 Wiring Box attached to the iNET-400 card.

Model No. Voltage Current Resistance Thermistor RTD T/C Cell Accelerometer Gage

Load Strain

iNET-42020SE

/10DI

10 10 10 10 10 10 – 10

iNET-423 6DI 66 6666 6 6
iNET-430 16SE/8DI 88 8888 – 8

instruNet Software

instruNet includes software to interrogate, test, configure, and do I/O with all network channels. This
includes an application program called "instruNet World" and interfaces to Visual Basic, C, and C++.
instruNet software can configure all I/O channels, store your settings, view digitized data in real time,
stream data to disk, and scroll through your waveform post-acquisition. instruNet software runs on
Windows computers.

instruNet World

instruNet World Plus (iW+)

DASYLab

LabView

Direct To Excel

To Order, Call or Shop Online at omega.com

C/C++

Visual BASIC

instruNet Scope

SM

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The iNET-555 Starter System,



shown to the right, provides the
following:

• USB 2.0 High Speed
Data Acquisition Hardware for
Windows ≥ XP SP2, Vista or 7
(XP/VS/7)

• instruNet Software

• 16se/8di Voltage Inputs,
16-bit A/D

• 2x Precision Voltage Out
(±10V, 14 bit)

• 2x Voltage Outputs (0..+10V, 8 bit)

• 4x Universal Digital I/O (10V, 30V)

• Connect Directly to Sensors:
Voltage, Thermocouple,
Thermistor, RTD, Load Cell, Strain
Gage, Potentiometer, Current,
Resistance.

• Easily expand via 2 free slots in
4 slot iNET-400 Card Cage

• The iNET-555 Includes the
Following Products: iNET-240,
iNET-430, iNET-510, iNET-400,
iNET-410, iNET-312-8.

SPECIFICATIONS

iNET-400
No. of Slots: Each iNET-400

supports up to four cards. Multiple
iNET-400’s can be bolted together
side-by-side to create an 8, 12, or
16 slot system

Material: Solid aluminum
construction

Dimensions:

15 D x 11 W x 14 cm H
(6 x 4.5 x 5.6")

Mounting: Place on desktop, affix
to DIN rail, 19" rack, or wall mount

ANALOG INPUTS
No. of Channels:

iNET-420: 20 single-ended

(SE)/10 differential (DI)

iNET-423: 6 differential (DI)
iNET-430: 16 single-ended (SE)/

8 differential (DI)

A/D Converter: 16-bit
(iNET-430 only)

Voltage: See voltage accuracy/

range charts (on next page)

Thermocouple:

J/K/T/E/R/S/B/N/C/G/D
Thermistor: 2252 Ω

(OMEGA 44000 Series)

RTD: 100 Ω, 500 Ω, 1 kΩ platinum

6

To Order, Call or Shop Online at omega.com

250 kg, 1000 kg, 5000 kg
Strain: 350 Ω (1/4 bridge,

half bridge or full bridge), 1 kΩ
(1/4 bridge)

Potentiometer: 10 kΩ, 50 kΩ
Current: ±80 uA, ±120 uA, ±500 uA,

±600 uA, ±800 uA, ±1.2 mA, ±2.5
mA, ±12 mA, ±24 mA,
0 to 24 mA

Resistance: 0 to 33 Ω, 0 to 100 Ω,
0 to 330 Ω, 0 to 1 kΩ, 0 to 3300 Ω,
0 to 10 kΩ

Common Mode Voltage: ±10 Vdc
(iNET-420 and iNET-430), ±5 Vdc
(iNET-423)

Crosstalk: < -80 dB typical
Input Impedance: 100 MΩ

iNET-430 PRECISION ANALOG
VOLTAGE OUTPUTS
No. of Channels: 2

Resolution: 14-bit
Range: ±10.1V
Output Current Drive: ±4 mA

iNET-430 ANALOG
VOLTAGE OUTPUTS
No. of Channels: 2

Resolution: 8-bit
Range: 0 to 10.1V
Output Current Drive: ±4 mA

DIGITAL I/O
(iNET-420/423/430)
No. of Channels: 4 universal digital

I/O (20 mA sink, -10 to 30V)

Working Voltage: -10 to 30 Vdc

“0” Input Voltage: -10 to 0.65V
“0” Input Current:

Amps = (4.5V – Vin)/3900

“1” Input Voltage: 2.1 to 30 Vdc
“1” Input Current: <1.4 mA
“0” Output Voltage:

<0.8V @ < 5 mA; < 2V @ <20 mA

“1” Output Voltage: 3.9 to 4.5V
“1” Output Current:

See “1” input current

Pull-Up Resistor: 3.9 kΩ±10%
Schmitt Trigger Input: Yes

ENVIRONMENTAL
Operating Environment:

1 to 45°C (34 to 113°F), <90% RH
Storage Temperature: -20 to 70°C

(-4 to 158°F)

POWER
Required: +5 Vdc, ±12 Vdc

required (supplied by iNET-312-8)
User Available: 3.3 Vdc, 5 Vdc,

±12 Vdc

SM

Load Cell: 10 kg, 25 kg, 100 kg,



Thermocouple Range/Accuracy

Accuracy

T/C Range iNET-420 iNET-423 iNET-430

0 to750°C ±1.2°C ±1°C ±1°C

-200 to 1250°C ±1.4°C ±1.4°C ±1.2°C
250 to 1540°C ±3.8°C ±4.3°C ±3.7°C

0 to 2190°C ±2.6°C ±2.9°C ±2.6°C
0 to 1540°C ±2.6°C ±2.9°C ±2.6°C

-200 to 990°C ±1°C ±1.2°C ±1°C
0 to 2300°C ±5.4°C ±6.2°C ±5.3°C

-200 to 1140°C ±1.7°C ±2.2°C ±1.7°C

-40 to 1500°C ±2.9°C ±3.6°C ±2.9°C

-40 to 1500°C ±2.6°C ±2.9°C ±2.5°C

-200 to 400°C ±1.2°C ±1.4°C ±1.2°C

iNET-400 card
cage, $390.

RTD (Requires OMEGA 10 kΩ shunt resistor iNET-R-10K)

RTD

Resistance

100 Ω -200 to -100°C ±3.1°C ±1.4°C ±1.3°C
100 Ω -100 to 300°C ±0.79°C ±0.79°C ±0.7°C
100 Ω 300 to 850°C ±5.4°C ±5.4°C ±2.6°C
500 Ω -100 to 300°C ±1.4°C ±1.4°C ±0.84°C

1,000 Ω -100 to 300°C ±0.44°C ±0.44°C ±0.8°C

Thermistor (Requires OMEGA 10 kΩ shunt resistor iNET-R-10K)

Thermistor
Resistance

2252 Ω 0 to 100°C ±0.27°C ±0.47°C ±0.47°C

Voltage Range/Accuracy

Voltage

Range 1

± 10V ±(0.017% + 671.µV) – ±(0.017% + 669.4µV)
± 5V ±(0.017% + 364.3µV) ±(0.015% + 347.9µV) ±(0.010% + 332.7µV)
± 2.5V ±(0.017% + 290.7µV) ±(0.015% + 194.2µV) ±(0.010% + 178.9µV)
± 1.2V – ±(0.016% + 129.8µV) ±(0.010% + 141.9µV)
± 600 mV – ±(0.016% + 91.8µV) ±(0.010% + 94.6µV)
± 300 mV – ±(0.016% + 82.9µV) –
± 80 mV ±(0.015% + 10.3µV) ±(0.018% + 9.8µV) ±(0.015% + 10.1µV)
± 40 mV ±(0.015% + 8.0µV) ±(0.018% + 7.4µV) ±(0.015% + 7.7µV)
± 20 mV ±(0.015% + 7.4µV) ±(0.019% + 6.5µV) ±(0.015% + 7.2µV)
± 10 mV – ±(0.019% + 5.9µV) ±(0.015% + 6.5µV)
± 5 mV – ±(0.019% + 5.8µV) –
0 to 10V ±(0.017% + 364.8µV) ––
0 to 5V ±(0.017% + 290.7µV) ±(0.015% + 194.2µV) ±(0.010% + 178.9µV)
0 to 2.5V – ±(0.015% + 157.3µV) ±(0.010% + 141.9µV)
0 to 1.2V ––±(0.010% + 94.6µV)
0 to 80 mV – ±(0.018% + 7.4µV) –
0 to 40mV – ±(0.018% + 6.9µV) –

To Order, Call or Shop Online at omega.com

Accuracy

Range

Range

iNET-420 iNET-423 iNET-430

iNET-420 iNET-423 iNET-430

Accuracy

iNET-420 iNET-423 iNET-430

Absolute Accuracy

(MAX Gain + Offset Error) with 1 ms Averaging

iNET-410, $190.

Shown smaller than
actual size.

iNET-430, $490.

SM

7



Ordering Example: iNET-555

Extended Warranty

Program

SM

and

Accessories

Ordering Example: iNET-240,

8

Shown smaller
than actual size.

iNET-400 card cage, $390, Shown with
iNET-410 and iNET-430 cards installed
(cards sold separately).

OMEGACARESMextended
warranty program is available for
models shown on this page. Ask
your sales representative for full
details when placing an order.
OMEGACARE
labor and equivalent loaners.

SM

covers parts,

MOST POPULAR MODELS HIGHLIGHTED!

To Order (Specify Model Number)

Model No. Price Description
Starter System

iNET-555 $990 Starter system, USA plug
iNET-555-EU 990 Starter system, European plug

iNET-400 Cards

iNET-410 $190 Interface between iNET-240 contoller and iNET-400 card cage
iNET-420 360 20SE/10DI voltage input, multiplexer, 4 digital I/O
iNET-423 490 6DI voltage input, amplifier, filter, 4 digital I/O
iNET-430 490 16-bit A/D, 16SE/8DI voltage input, multiplexer, 4 voltage out, 4 DIO
iNET-460 360 28 digital I/O channels

iNET-400 Card Cage

iNET-400 $390 Card cage for iNET-410/420/423/430/460 cards, 4 slots, expandable

OCW-1

OMEGACARESM1-year extended warranty

starter system including

Model No. Price Description

iNET-510 $85
iNET-511 165
iNET-512 145

Wiring box with screw terminals
Wiring box with BNC connectors
Strain gage/sensor wiring box with screw terminals (not for thermocouples - use iNET-510

for thermocouple measurement)

iNET-HD44MF-3M 58 Cable, Hd44m to Hd44f, 26 Awg, 3 m (10')
iNET-330 390 Optical isolator between iNET-240 controller and device
iNET-530 110 Wall and DIN rail mounting kit for one iNET-400 card cage

InstruNet Controller

iNET-240 $290 USB instruNet controller for Windows ≥ XP SP2, comes complete with 3 m (10') USB cable,

instruNet network terminator and intruNet World software on CD (requires iNET-312-8
power supply).

Power Supplies

iNET-312-8 $90 Power supply, USA Plug, 110/220 Vac, (includes iNET-300 power adaptor)
iNET-312-8EU 90 Power supply, European plug, 110/220 Vac, (includes iNET-300 power adaptor)
iNET-300 60 Power adaptor

Software

iNET-iWPLUS $230 instruNet World Plus software (iW+)

Shunt Resistors

iNET-R-33 $78 33 Ω, 8-pack, 0.05%, 5 ppm/°C drift
iNET-R-120 78 120 Ω, 8-pack, 0.05%, 5 ppm/°C drift
iNET-R-350 78 350 Ω, 8-pack, 0.05%, 5 ppm/°C drift
iNET-R-1K 78 1000 Ω, 8-pack, 0.05%, 5 ppm/°C drift
iNET-R-3300 78 3300 Ω, 8-pack, 0.05%, 5 ppm/°C drift
iNET-R-10K 78 10 kΩ, 8-pack, 0.05%, 5 ppm/°C drift
iNET-R-33K 78 33 kΩ, 8-pack, 0.05%, 5 ppm/°C drift

USB instruNet controller for Windows ≥XP SP2,

To Order, Call or Shop Online at omega.com

iNET-240, iNET-430, iNET-510, iNET-400, iNET-410 and iNET-312-8

($99)

adds 1-year to standard 1-year warranty, $990 + 99 =

$290.

$1089.

SM

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