CA series conditioners provide electrical (galvanic) isolation between the sensor and measuring system up to 1500 V. They have a very high accuracy, linearity and
durability, and there is a large number of different models. Common to this type of conditioner is that it has an analog input channel that accepts signals from all
types of commercial sensors.
Sensor signal is filtered, amplified, isolated, linearised, filtered again and converted to a level suitable for connection to the system for data acquisition,
industrial PC, PLC or any other measurement system.
- Isolation 1500 Vrms (4.000 V, 1 minute)
- Accuracy ±0.03% of full range
- Linearity better than ±0.01% of full range
- 80 dB NMR for 50Hz
- 160 dB CMR
- Triple isolation: input-output-power supply
- Power supply: 19 V to 30 V DC
- Output: current or voltage, unipolar or bipolar
- Input protected minimum 250 Vrms continuous
- Waranty 7 and service 10 years
- Industrial and laboratory appications
- Protection from ground loop
- Protection from dangerous voltages
- Protection of electronic equipment from static
electricity, transients and discharge
- Reduction of RF i EMI noise from measurement signal
- Increases reliability of equipment and time before
The following table lists the types of conditioners from the CA series
that are available. They are further divided into smaller groups with
specific specifics on the following pages of the description.
||Voltage input conditioners
||Current input conditioners
||Effective (RMS) voltage and current conditioners
||Linearised RTD with 2 or 3 connections
||Potentiometer input conditioner
||Conditioners for thermocouples with cold junction compensation
||Bridge measurement conditioners
||Conditioner for current loop sensor input
||Universal conditioners with DC excitation
||Thermocouple conditioners with cold junction compensation and linearisation
isolation conditioners of the Series CA significantly raise the accuracy
of measurement, reliability and professionalism in the applications of
data acquisition systems, in measurement and process management. This
group of conditioners was developed after many years of consideration of
the requirements and needs of the users. Characteristics that are
constantly improving are accuracy, linearity, repeatability and
protection against accidental voltage connections, transients and other
hazardous events. The CA series at this time is produced in variations
of over 400 models.
Depending on the Family, the conditioners have a typical linearity of ±
0.01% of full range, small hysteresis and excellent repeatability. High temperature
stability does not require calibration. However, on the front of the
module there are two multi-turn potentiometers that allow the user to
change the set values to the output level that is required for some
application. This correction is possible within a range of
typically ± 3% full scale.
Thermocouple Conditioners Families CA-37 and CA-47 have a cold-end
compensation of the thermocouple of ± 0.5 ° C. Unlike the CA-37 Series,
the CA-47 Series has a degree of linearization of the signal from a
thermocouple that hardware-implemented the so-called segment
approximation. This hardware add-in frees the user from writing the
linearization code of the thermocouple in its acquisition system or PLC.
The difference between the non-linearity of the sensor and the
linearization performed by the CA module was called
"mismatch approximation". The term "Conformity" is often in use.
Most models of this group of conditioners have a generally accepted
frequency band of 3 Hz. Exceptions are conditioners with
a frequency range of 100 Hz and 1 KHz for measuring bridges with current
inputs and models for measuring the effective voltage and current. For
standard models, the output noise level is below 200 μVrms. For fast
measurements, ED offers models with a broadband amplifier with a
frequency range of 10 kHz and a linearity equivalent to 14 bit A / D
Each CA conditioner has insulation between the input and the output side
to the voltage level of 1500 Vrms continuously or 4 kV for 1 minute. All modules of
this series have a triple insulation that sets the isolation barrier
between the input and output stages of the conditioner and the power
level. The power supply level is galvanically isolated from both the
input and the output side of the conditioner.
"Common-mode" is between 105 and 160 dB. The filter is the fifth
suppresses 50 Hz with 80 dB (10,000 times). The CA module
has built-in electronic protection circuits at the input and output,
which allow these modules to be operational in an hostile electrical
environment. Protective circuitry protects the input to at least 250 VAC. The input and output are
protected from excessive events as defined by ANSI / IEEE C37.90.1-1989.
The modules are powered by a DC 24 V voltage or a voltage that can be
between 19 V to 30 V DC. The CA series is
designed to be "hot-swappable", that is, modules can be plugged into the
system or disconnected from the system without having to switch off the
power supply beforehand. On the front of each module there is a LE diode
that indicates the presence of a supply voltage. Typical consumption is
between 25 and 50 mA, depending on whether the module has a voltage or
The conditioners have excellent stability in time and do not require
additional calibration or any maintenance. The warranty period is 7
years and the service period is 10 years. It is delivered with a user
manual in Serbian language and with a calibration list.
Power supplies for CA conditioners
For the power supply
of a smaller number of conditioners, up to 20, the
CS-24-30 power supply of
30W (picture on the left) is recommended, and for more,
CS-24-90 of 90W should be
used, which can power up to three times more conditioners. Both
models can use the T-BUS connectors directly, without wiring to
power the conditioners that are on the same, or with the
extension cable on different DIN rails in a closed environment.
This option raises reliability, significantly reduces the time
of replacing the conditioner and enables the switching on and
off of the conditioner when the bus T-bus is powered up.
Both power supplies work in a wide voltage range from 160V to
265V AC. If the user does not want to use this type of power
supply, he can also use other power supplies, but in this case
the power must be wired between conditioners
should be specifically specified for the environment with
increased humidity. In this case, they are protected by a
composite lacquer that protects the components from moisture
and corrosion. This feature significantly extends the life
of this product and in terms of long-term measurement
accuracy. The prepared conditioner can be used in many
aggressive environments, for example on ships at the seaside,
in conditions of aggressive vapours, at the water
supply facilities, etc.
supply input is designed to provide protection against inverse polarity
and against transients as defined by ANSI / IEEE C37.90.1-1989 document.
The CA Series modules have dimensions: Height 105 mm; width 22.5 mm, and
depth of 114 mm. All modules are in accordance with DIN EN 50022 35 mm
standard for a DIN rail of 19 "width. Operating temperature is -40 ° C
to +85 °C, for accuracy by specification is -25 to +80 °C. The relative
humidity is up to 95% without condensation.
If none of the offered conditioners fully complies with your
application, a conditioner can be produced on request using the user
specification. For this option, call ED, +381/11/308-50-30.
CA dimensions in millimetres.