Signal isolators - signal conditioners

The Stroud Instruments range of process signal isolators / signal conditioners provide cost-effective isolated signal booster, signal converter or loop splitter functions. The input, outputs and power supply are electrically isolated from each other making these units ideal for solving signal incompatibility and earth loop problems during process control systems commissioning. The signal isolator can also provide scaling e.g. if the working range of a nominal 4-20mA signal is 6-12mA the output can be scaled to suit.

Typical signal isolator applications

• The dual output isolator enables one measurement to be sent to two separate systems
• Isolation and conversion of dangerous voltages to safe levels
• Overcoming ground loop problems where a common mode voltage exists between the input and output
• Solving current loop loading problems
• Converting voltage signals to current or current signals to voltage
• Scaling of process variables
• Interfacing field sensors, transducers and transmitters with indicators, PLCs, and other process control instrumentation

The COM-3B is field configurable. See the Signal Isolator data sheet

Isolator selection guide

Select from: <Single channel isolators> <Dual channel isolators (signal splitters)>

PLEASE NOTE with most of our signal converters, other inputs and outputs
within the following ranges can be provided.

INPUTS: Current from 0-1mA to 0-30mA, Voltage from 0-1V to 0-250V
OUTPUTS: Currents from 0-1mA to 0-30mA, Voltage from 0-1V to 0-10V
Bidirectional voltage signals (e.g. ± 5 V) or reverse acting current and
voltage signals (e.g. 4-20mA to 20-4mA) signals are possible.
Current sink output is available on most types.
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Key: Datasheet; User guide

Single channel signal isolators

TYPE	INPUT	OUTPUT	FEATURES	FIELD RE-RANGE	POWER	MOUNTING
B12-SI	Current 0-10mA 0-20mA 4-20mA Voltage 0-5 V 1-5 V	Current 0-10mA 0-20mA 4-20mA Current sink Voltage 0-5V 1-5V	Span & zero controls ~ Current input loop integrity*	No	AC 110,200,220,240 ~ Universal 11-30 VDC (12-24 VAC)	Wall or DIN rail
B12-Txi	Current 0-10mA 0-20mA 4-20mA Voltage 0-5 V 1-5 V	Current 0-10mA 0-20mA 4-20mA Current sink Voltage 0-10 V 2-10V	Ideal for 2 and 3 wire transmitters ~ 24V Transmitter power supply ~ Current input loop integrity*	Yes	Universal 85-260VAC	Wall or DIN rail
107-3A	Current 0-10mA 0-20mA 4-20mA Voltage 0-5 V 1-5 V etc	Current 0-10mA 0-20mA 4-20mA Current sink Voltage 0-5 V 1-5V etc	High impedance drive current output option ~ Current input loop integrity*	No	AC 110,200,220,240 ~ 12, 24, 48VDC	Wall or DIN rail
COM-3B	Current 0-10mA 0-20mA 4-20mA Voltage 0-5 V 1-5 V	Current 0-10mA 0-20mA 4-20mA Current sink Voltage 0-10V 2-10V	Narrow profile - high packing density ~ Unpluggable connectors	Yes	Universal 11-30VDC	DIN rail
140-3	4-20mA	4-20mA	Loop-powered	No	-	DIN rail

Dual channel signal isolators

TYPE	INPUT	OUTPUT	FEATURES	FIELD RE-RANGE	POWER	MOUNTING
B12-SI/2	Current 0-10mA 0-20mA 4-20mA Voltage 0-5 V 1-5 V	Current 0-10mA 0-20mA 4-20mA Current sink Voltage 0-5V 1-5V	Dual output ~ Span & zero controls ~ Current input loop integrity*	No	AC 110,200,220,240 ~ Universal 10-32VDC	Wall or DIN rail

*Current input loop maintained when module unplugged

For more in our range of signal isolators, converters and conditioners - see the Signal Converters index