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Isolated Current Input Signal Conditioning ModuleSingle-Channel Signal Conditioning Module Rev. 0
Isolated Current Input.
Amplifies, Protects, Filters, and Isolates Analog Input.
Measure process-current input signal of 4-20 mA or 0-20 mA
by reading the voltage across an external precision 20Ω
Generates an output of 0 to +5V.
Extra Current Conversion resistors are available.
Module circuitry can withstand 240v rms at the input screw-
All 5B32 series modules are mix-and-match and Hot
Industrial signal conditioning
Industrial signal isolation
Industrial signal filtering
The 5B Series represents an innovative generation of low cost,
high performance plug-in signal conditioners. Designed for
industrial applications, these modules incorporate highly
reliable transformer-based isolation and automated surface-
mount manufacturing technology. They are compact,
economical components whose performance exceeds that
available from more expensive devices. Combining 1500 V rms
continuous isolation, +0.05% calibrated accuracy, small size and
low cost, the 5B Series is an attractive alternative to expensive
signal conditioners and in-house designs
All modules are potted and identical in pin-out and size (2.27” x
2.32” x 0.595”). They can be mixed and matched, permitting
users to address their exact needs, and may be “hot swapped
without disturbing field wiring or power. The isolated input
modules provide 0 to +5V or +5V outputs and accept J, K, T, E,
R, S, N, or B type thermocouples.
These modules feature complete signal conditioning functions
including 240 V rms input protection, filtering, chopper
stabilized low drift +1 uV/oC amplification, 1500 V rms
isolation, and sensor excitation when required.
All modules feature excellent common mode rejection and
meet industrial transient surge withstand specifications.
FUNCTIONAL BLOCK DIAGRAM
Figure 1. 5B32 Functional Block Diagram
There are also a number of backplanes and mounting sockets
which provide a complete signal conditioning solution for end
users. Each backplane incorporates screw terminals for field
wiring inputs and outputs and cold junction sensors for
These signal conditioners are designed to provide an easy and
convenient solution to signal conditioning problems of both
designers and end users in measurement and control
applications. Typical uses include microcomputer-based
measurement systems, standard data acquisition systems,
programmable controllers, analog recorders and dedicated
control systems. The 5 B series modules are ideally suited to
applications where monitoring and control of temperature,
pressure, flow, rotation and other analog signals are required.
The 5B Series modules and backplanes are approved by Factory
Mutual (FM) and the 5B Series modules are approved by the
Canadian Standards Association (CSA) for use in Class 1,
Division 2, Groups A, B, C, and D locations. These approvals
certify that the 5B Series is suitable for use in locations where a
hazardous concentration of flammable gas may exist only under
fault conditions of operation. Equipment of this category is
called “nonincendive” and they need no special enclosures or
other physical safeguards.
The 5B series modules and backplanes have been tested and
passed the stringent heavy industrial requirements of the
European Union’s electromagnetic compatibility (ENC)
directive – EN50082-1 and EN50081-2. When used according
to installation directions (refer to 5B series User Manual), any
errors caused by EMI/RFI interference will be less than 0.1% of
the full scale 5B measurement range for field strengths up to 10
V/M and frequencies up to 1 GHz. GENERAL DESCRIPTION
The 5B32 is a single-channel signal conditioning module that
amplifies, protects, filters and isolates its analog input. The
module measures a process current input signal of 4-20 mA or
0-20 mA by reading the voltage across an external precision
20W resistor (supplied) and generating an output of 0 to +5 V.
Extra current conversion resistor are available as accessories
(See Model AC1362 in the Accessories section).
Note that the 5B32 module circuitry can withstand 240 V rms at
the input screw-terminals, thereby shielding computer-side
circuitry from field-side overvoltage conditions. In addition, all
5B32 Series modules are mix-and-match and hot swappable, so
can be inserted or removed from any socket in the same
backplane without powering down the system.
A chopper-stabilized input amplifier provides low drift and
stable gain. At the amplifier input, a stable, laser-trimmed zero-
scale input offset is subtracted from the input signal to set the
zero-scale value for the 4-20 mA range. For user convenience,
the zero can be optionally factory-set to meet custom needs,
This allows suppression of a zero-scale input value many times
larger than the total span for precise expanded-scale
Internal multi-pole lowpass filtering with a four-Hz cutoff (-
3dB) enhances normal-mode (noise on signal) and common-
mode (noise on signal return) rejection at 50/60 Hz, enabling
accurate measurement of small signals in high electrical noise.
A series output switch eliminates the need for external
multiplexing in many applications. The switch is turned on by
an active-low enable input. If the switch is to be on at all times,
the enable-input should be grounded to power common as it is
on the 5B01 and 5B08 backplanes..
Common-Mode Voltage (CMV)3
Common Mode Rejection (CMR)
1 Iz is the nominal input current that results in a 0 V output.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes RL > 50 kΩ. Does not include current-to-voltage input resistor (AC1362) error.
3 The output common must be kept within ±3 V of power common.
4 Loads heavier than 50 kΩ will degrade nonlinearity and gain temperature coefficient.
5 The current-to-voltage conversion resistor (AC1362) is supplied as a plug-in component for mounting external to the module. All backplanes and mounting cards provide pin
sockets for mounting the AC1362 resistor.
Specifications subject to change without notice.
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 5B32 Input Field Connections
Table 1. Pin Function Descriptions—
Figure 4 . Model 5B Series Module, with pin-out assignments.
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human
body and test equipment and can discharge without detection. Although this product features proprietary ESD
protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges.
Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Figure 5. Outline Dimensions
5B32 Models Available
Model Input Range Output Range
5B32-01 4 mA to 20 mA 0 V to +5 V
5B32-02 0 mA to 20 mA 0 V to +5 V
5B32-Custom * *
* Custom Input/Output ranges are available.
Refer to configuration guide.