Signal Conditioning Instruments Send Enquiry

PROTOCONTROL brand signal conditioning instruments are specially developed for signal conditioning of wide varieties of transducers such as potentiometers, RTD's, thermocouples, strain gauge bridges, proximity switches, magnetic or optical pick-ups, AC/DC voltages and currents with complete optical and galvanic isolation between input and output. The various signal conditioners can be broadly classified into three types :

1. Signal Transmitters :

The purpose of current signal transmission is to achieve immunity to level drops from long runs and noise from motors , relays, actuators, transformers, switches, etc. Normally, these are built-in transducers.

2. Signal Isolators :

The purpose of galvanic isolation is to overcome ground-loop problem and to isolate high voltage plant side from the low voltage computer side/ Instrumentation panel side. This current signal is used in control room for the indication, control, data logging, data processing ,etc. In case of isolators, normally output parameter is the same as the input parameter and more number of outputs with a single input is available.

3. Signal Converters :

Converts various field signal from RTD, thermocouple or other signals like current, voltage , frequency, resistance or any other parameter into electrical parameter. In this case,output parameeter is normally not same as input Parameter. Both isolated and non-isolated versions available.

Signal-Conditioning

Common Specifications :

Galvanic Isolation : 500 V DC/ 1KV RMS(In case of isolators )
Working Temp. : 10 To 50 C
Storage temp. : 70 C
Linearity Scale : Better than 0.3% over full
Instrument Accuracy Scale : Better than 0.3% over full
Zero and Span adjustment : Provided by means of trim-pot(external/internal)
Termination : Suitable for 2.5 mm square conductors
Supply voltage : 110V / 230 V DC/AC

Transmitters

Non-Isolated, Two-wire Head Mounted Transmitters

SERIES ST-N2 :
The two-wire transmitter allows signal and power to be supplied through single wire pair by modulating the power supply current with input signal source. These transmitters find extensive use in industrial process control applications.

Temperature Transmitters :

It accepts temperature sensor input
Two-wire 4-20 mA output
It operates on 10-60 V DC typically 24 V DC
Output is not temperature value linearised but is proportional to sensors electrical output
Calibrated to the desired range
INDEPENDENT zero and span adjustment is provided for periodic recalibration
Spare card without transducer is available

SERIES ST-N2 :
TYPE INPUT OUTPUT
ST-N2 P/I RTD : PT 100 4-20 mA
ST-N2 TC/I THERMOCOUPLE 4-20 mA

Specify the type of thermocouple sensor :
J Iron/Constantan thermocouple.
S Platinum 10% Rhod./Plat. thermocouple.
T Copper Constantan thermocouple

Non-Isolated, Four-wire Head Mounted Transmitters

SERIES ST-N4 :
TYPE INPUT OUTPUT
PST-N4 P/I RTD : PT 100 4-20 mA
ST-N4 TC/I THERMOCOUPLE 4-20 mA

Loop Powered Isolators : Isolated versions of all the transmitter models are also available on request.

Isolaters

It is a unit that accepts most common high level process signals ( current and voltage),isolates them electrically and galvanically without changing the output parameters
Input and output are thus same and isolation is provided by the circuitry.
Isolates field signals from control room instruments. Eliminates ground loop problems
Makes weak field signals immune to level drop due to long run and noise
Optional facility provided to measure loop current. This special facility is useful to calibrate the instrument on line without disturbing the loop and thus the process
Multiple outputs models available for independent processing
NDEPENDENT zero and span adjustment is provided for periodic recalibration
OPTIONAL FEATURE : Transmitter power supply 24V DC 50 mA is available on request
ISOLATION VOLTAGE : 500 V DC for Din Rail, 1KV for Din Rail/ Back Panel/ Cast Al Field Mounting
Solators are available in several versions depending upon the nature of input and No. of outputs :
SI-1 : It provides single output from a single input
SI-2 : It provides two isolated outputs from a single input
SI-3 : It provides three isolated outputs from a single input
SI-4 : It provides four isolated outputs from a single input

* PLEASE REFER ORDERING PROFORMA ON NEXT PAGE
Special versions for use in flame proof area are available

Non-Isolated, Four-wire Signal Converters: Series : SC-N4 :

Converters are basically used for converting one type of parameter into another
Converts various field signal like current, voltage , frequency, resistance compatible to central signal processing equipment
INDEPENDENT zero and span adjustment is provided for periodic recalibration
This device is equipped with state of the art digital circuit
Available in both DC and AC power versions
Mounting : D(DIN RAIL) / BP(BACK PANEL)/Al (Field mounting in cast Al)
Supply voltage : 10-60V DC/230 V DC/AC/110 V DC as per requirement

Frequency To Current Converter : SC-N4 F/I :

It is used for the conversion of an input frequency into an impressed direct current
Input frequency range and output current range as per customer specifications
Maximum load resistance 600 Ohm and can be extended upto 1K on special request.

Frequency To Voltage Converter : SC-N4 F/V :

It is used for the conversion of an input frequency into an impressed direct voltage
Input frequency range and output voltage range as percustomer specifications
Buffered Output
Maximum current available at the output is 15-20 mA

Voltage To Current Converter : SC - N 4 V/I:

This unit provides an current output from a voltage input
Input voltage range as per customer specifications
Maximum load resistance 600 Ohm and can be extended up to 1K on special request

Current To Voltage Converter : SC - N 4 I/V :

This unit provides an voltage output from a current input. Input current range and output voltage range as per customer specifications
Buffered Output
Maximum current available at the output is 15-20 mA

Isolated Converters Isolated Transmitter

It is an isolating converter that accepts most common high level process signals (current & voltage),
isolates them and converts them into any other process signals
The output is normally not the same as input
Available in DC & AC power versions
INDEPENDENT zero and span adjustment facility is provided on the front panel

Isolated Frequency To Current Converter : SC- I F/I

It is used for the conversion of an input frequency into an impressed direct current 0-20 mA or 4-20 mA with optical as well as galvanic isolation
Maximum load resistance 600 Ohm and can be extended upto 1K on special request

Isolated Frequency To Voltage Converter : SC-I F/V :

It is used for the conversion of an input frequency into an impressed direct voltage with optical as well as galvanic isolation
Buffered Output
Maximum current available at the output is 15-20 mA

Isolated Voltage To Current Converter : SC-I V/I :

This unit provides an isolated current output from a voltage input
Maximum load resistance 600 Ohm and can be extended upto 1K on special request

Isolated Current To Voltage Converter : SC - I I / V

This unit provides an isolated voltage output from a current input
Buffered Output
Maximum current available at the output is 15-20 mA

Power Converters : SP

These are used in power industries
These provide with an isolated 4 - 20mA output
Auxiliary voltage supply : 230 V DC/AC 110 V DC/AC

Type	Input
SCP-VA	: POWER(VA)
SCP-V	: VOLTAGE
SCP- A	: CURRENT
SCP- PF	: POWER FACTOR
SCP- KW	: Kilo Watts
SCP- MW	: Mega Watts
SCP- KWH	: Kilo Watt Hour (Energy )
SCP-MWH	: Mega Watt Hour

Other Products :

Process Indicators
Field Indicators
Flow Totalisers
Bar Graph Indicators
Signal Isolaters
Digital Instruments with built-in Isolated output

Ordering Proforma

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