Omega Products OM5-DT-1-C User Manual

H-43

$

155

Basic Modules

⻬ Rugged, Compact

Economical Signal
Conditioning

⻬ Modular Design

for Mix and Match
Capability

⻬ Analog Input Modules

for Direct Interface to
Sensors and Analog
Voltage and Current

⻬ Convenient Connection

to User Equipment

OM5 Compact, Low Cost, Modular

RTD Input Models

The OM5-IP, OM5-IC and OM5-IN
are designed for 100Ω PT, 10Ω Cu
and 120Ω Ni RTDs respectively.
The modules have 3 wire
compensation and may be used
with 2- or 3-wire RTDs. The
OM5-IP4 features 4-wire
compensation for 100Ω PT RTDs.

Strain Gage Input Models

Designed for 300 to 10 kohm full or
half strain gage bridge for dynamic
signals. Bandwidth is 10 kHz.
Integral 10 V excitation is also
provided.

Output Models

Isolated modules that accept
process voltage inputs from the
system connector and provide an
isolated process current signal as
output.

Potentiometer Input Models

For use with 3-wire potentiometers
and 2-wire slidewire with up to
10 KΩ resistance. The input signal
is filtered, isolated and amplified to
a high level analog output voltage.

Isolated Voltage Input
Models

Designed for either low-level
millivolt or high level voltage inputs,
these modules can accept from
±10 mV to ±10 V full scale input,
with either a 0 to 5 V or ±5 V output.
Standard modules have a 4 Hz
bandwidth, while for interfacing to
dynamic signals, the OM5-WV and
OM5-WMV modules feature a
10 kHz bandwidth.

Current Input Models

These modules accept process
current signals. A sensing resistor
of 20 ohms is used to convert the
signal current to a voltage. The
resistor is installed as a separate
assembly, to facilitate replacement
in the event of inadvertent
connection of the power line.

Thermocouple Input Models

The isolated thermocouple models
incorporate cold junction
compensation circuitry which
provides 0.5°C accuracy. Open
sensor detection is standard.

The OM5 series modular signal
conditioners provide a low cost,
high performance method of inter­connecting real-world analog
signals with data acquisition,
monitoring or control systems.

They are designed to interface
directly to analog inputs such as
thermocouples, RTDs, strain gages
and voltage or process current
signals. Individual OM5 modules
convert these inputs to standardized
analog outputs compatible with
high-level analog I/O systems. An
output module converts a high-level
analog output to a process
current signal.

The OM5 is designed to provide
easy and convenient solutions to
signal conditioning problems of both
designers and end users in
measurement and control
applications.

Typical uses include mini- and
microcomputer-based measurement
systems, standard data acquisition
systems, recorders, and dedicated
control systems.

The OM5 is ideally suited to
applications where monitoring
and control of temperature,
pressure, flow and other analog
signals is required.

H

Signal Conditioners

H-44

SYSTEM CONFIGURATION

The OM5 system is fully modular,
for maximum user flexibility. When
designing a system, in addition to
selecting input and output modules,
both a backplane and power supply
are required.

The OM5-BP-16 is a 16-position
plane with pinouts on system
connector that are compatible with
the OM3 system; this allows an
OM5 to interface to plug-in cards for
IBM PCs. Also available for single
channel applications is the
OM5-BP-SKT single channel
backplane.

Two power supplies are available
for OM5 systems. The OMX-955
has 1A capacity, and can be used
with up to 16 input modules. For
systems with larger requirements,
the OMX-976 has 3A capacity, and
can drive a full complement of
16 output modules.

The OMX-1315 cable mates directly
to the OM5-BP-16, and may be
connected to the OMX-1324
adapter. The OMX-1324 provides
screw terminations for the high level
voltage output from the system
connector.

Shown with
optional sensors

Excitation is provided by two
matched current sources which
cancels lead resistance effects in
3-wire potentiometers. The
excitation current is small
(less than 1.0 mA) to minimize
self-heating error.

Displacement Transducer
Input Modules

The displacement transducer input
modules can interface to DC
displacement transducers and
other devices which require a
precision excitation voltage. The
transducer excitation is provided
from the module by a stable
isolated 10 V source.

Two-Wire Transmitter
Interface Modules

The OM5-TX are ideal for
connecting to 2-wire loop power
transmitters. The modules accept
4-20 mA process current input and
provide an isolated output voltage.

A/OUT

How to Order

To Assemble a Complete OM5 System, Order:

1. Desired input and output modules

2. Backplane

3. Power Supply: calculate system power requirements
from table on H-80

4. Voltage I/O cables and connectors

5. Rack or Surface Mount Kit

The module features an isolated
20 Vdc regulated power supply to
provide power to the transmitter.
A precision 20 ohm current
conversion resistor is supplied with
each module.

A/IN

H-45

Model Input Response
Number Price Range Time

OM5-IFI-500-C $185 0-500 Hz 300 mS
OM5-IFI-1K-C 185 0-1 KHz 300 mS
OM5-IFI-3K-C 185 0-3 KHz 170 mS
OM5-IFI-5K-C 185 0-5 KHz 90 mS
OM5-IFI-10K-C 185 0-10 KHz 90 mS
OM5-IFI-25K-C 185 0-25 KHz 20 mS
OM5-IFI-50K-C 185 0-50 KHz 20 mS
OM5-IFI-100K-C 185 0-100 KHz 20 mS

Compact, Low Cost Modular
Signal Conditioners

Frequency Input, Isolated, 0 to 5 Vdc Output

Model Accuracy

OM5-DT Displacement Input ±0.1% span ±10µV RTI1
OM5-II Current Input ±0.05% span +0.05%(/-I

Z

2

)
OM5-IFI Frequency Input ±0.05% span
OM5-IP/IC RTD Input See ordering table
OM5-ITC Non-linearized Thermocouple ±0.05% span ±10µV RTI

1

OM5-IVI Current Output ±0.05% span
OM5-LTC Linearized Thermocouple See ordering table
OM5-PT Potentiometer Input ±0.08% span
OM5-TX Transmitter Input ±0.05% span ±4µV RTI

1

OM5-WBS Strain Input ±0.08% span ±10µV RTI

1

OM5-WMV & OM5-IMV Millivolt Input ±0.05% span ±10µV RTI

1

±0.05% (V

Z

3

)

OM5-WV & OM5-IV Voltage Input ±0.05% span ±0.2mV RTI

1

±0.05% (V

Z

3

)

(1) RTI = Reference to input
(2) IZis the current input that results in 0V output
(3) VZis the voltage input that results in 0V output

Accuracy

Specifications

Input Ranges: See ordering table
Common Mode Voltage, Input to Output:

1500 Vrms max

Non-linearity: 0.02% span
Bandwidth:

OM5-II, OM5-IMV, OM5-ITC, OM5-IV, OM5-IP/IC/IN,
OM5-LTC, OM5-PT: 4 Hz

OM5-WBS, OM5-WMV, OM5-WV: 10 KHz

OM5-TX: 100 Hz
OM5-DT: 1 KHz
OM5-IVI: 400 Hz
OMF-FR: See ordering table

Input (field) Protection: 240 Vrms max
Output Range: See ordering table
Output Resistance (input modules): 50Ω
Output Current limit (input modules): ±14 mA max
Operating Temperature Range: -40 to 85°C
Module Dimensions: 2.28" x 2.26" x 0.60"

(58 x 57 x15 mm)