ETC 2B22

High Performance, Isolated
Voltage–to-Current Converter
Wide Input Range: 0 to +1V to 0 to +10V
Standard Output Range: 4 to 20mA
High CMV Input/Output Isolation: 1500V dc Continuous
Low Nonlinearity: 0.05% max, 2B22L
Low Span Drift: 0.005%/°C max, 2B22L
Single Supply: +14V to +32V
Meets IEEE Std 472: Transient Protection (SWC)
Meets ISA Std 50.1: Isolated Current Loop Transmitters
Functional Block Diagram
Industrial Instrumentation and Process Control
Ground Loop Elimination
High Voltage Transient Protection
D/A Converter - Current Loop Interface
Analog Transmitters and Controllers
Remote Data Acquisition Systems
Model 2B22 is a high performance, compact voltage-to-current
converter offering 1500V dc input to output isolation in interfacing
standard process signals. The input stage of the model 2B22 is single
resistor programmable to accept voltage ranges from 0 to +1V to 0 to
+10V. The isolated output current range is 4 to 20mA, and the 2B22
can be operated with 0 to 1000Ω grounded or floating loads.
Using modulation techniques with transformer isolation for reliable
performance, the 2B22 is available in three accuracy selections offering
guaranteed nonlinearity error (2B22L: ±0.05% max, 2B22K: ±0.1%
max, and 2B22j: ±0.2% max) and guaranteed low span drift:
±0.005%/°C max, ±0.01%/°C max, and ±0.015%/°C max, respectively.
The internally trimmed span and offset errors are ±0.1% max for the
2B22L and ±0.25% max for the 2B22J/2B22K. Both span and offset
are adjustable by the optional external potentiometers.
Featuring a wide range, single supply operation (+14V to +32V), the
2B22 provides isolated +28V loop power and is capable of delivering
rated current into an external 0 to 1000Ω load resistance. The unique
output stage configuration also allows the user to utilize an optional
external loop power supply to interface systems designed for a twowire operation.
Model 2B22 has been specifically designed for high accuracy
applications in process control and monitoring systems to offer
complete galvanic isolation and protection against damage from
transients and fault voltages in transmitting information between
subsystems or separated system elements. The 2B22
Information furnished by Intronics is believed to be accurate and reliable. However, no
responsibility is assumed by Intronics for its use; nor for any infringements of patents or
other rights of third parties which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of Intronics.
meets the requirements of the instrument Society of America Std. 50.1
"Compatibility of Analog Signals for Electronic Industrial Process
instruments" for Type 4, Class U isolated current loop transmitters.
In the industrial environment, model 2B22 can serve as a transmission
link between such system elements as transmitters, indicators,
controllers, recorders, computers, actuators and signal conditioners. In
data acquisition and control systems, the 2B22 may act as an isolated
interface between the D/A converter output of a microcomputer and
standard 4 to 20mA analog loops.
High Reliability: Model 2B22 is a conservatively designed, compact
module capable of reliable operation in harsh environments. To assure
high reliability, the 2B22 has a calculated MTBF of over 270,000
hours and has been designed to meet the IEEE Standard for Transient
Voltage Protection (472-1974: Surge Withstand Capability).
Process Signal Compatibility: The versatile input stage design with a
single resistor gain adjustment enables the 2B22 to accept any one of
the standard inputs0-1V, 0-10V, 1-5V; or 1-5mA, 4-20mA, 1050mA; and provide standard, isolated 4-20mA output.
Isolated loop Power: Internal 28V dc loop supply, completely isolated
from the input power terminals (±1500V dc isolation), provides the
capability to drive 0 to 1000Ω loads and eliminates the need for an
external dc/dc converter.
1400 Providence Highway, Building #2
Norwood, MA 02062
Phone (781) 551-5500
FAX (781) 551-5555