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Removable Plugs

Dimensions

1.78" W x 4.62" H x 4.81" D
45 mm W x 117 mm H x 122 mm D
Height includes connectors

Sink or Source

mA Output for

Each Channel

Output LoopTracker

LED for Each

Channel

Adjustable Output

Test Function for

Each Channel

Zero and Span for

Each Channel

Built-in Excitation

Voltage for Strain

Gauge Input

Custom I/O Ranges

Description

The APD 2051 DuoPak accepts one strain gauge input and one
RTD input and provides two optically isolated DC voltage or
current outputs that are linearly related to the inputs.
The input ranges and the output ranges for each channel are
independent and can be specified as required. This provides an
economical two channel solution in one device.
Typical applications include signal conversion, isolation, and
redundancy (i.e. to prevent failure of the entire loop if one
device fails), or a combination of these.
Each input signal is filtered, amplified, and then passed
through an opto-coupler to the output stages. Full 5-way
isolation (input 1, input 2, output 1, output 2, power) make
this module useful for ground loop elimination, common mode
signal rejection, and noise pickup reduction.

Output Sink/Source Versatility

Standard on the APD 2051 are 20 VDC loop excitation sup-
plies for each output channel. These power supplies can be
selectively wired for sinking or sourcing allowing use with any
combination of powered or unpowered milliamp I/O devices.

LoopTracker

API exclusive features include four LoopTracker LEDs (green
for each input, red for each output) that vary in intensity with
changes in the process input and output signals.
These provide a quick visual picture of your process loop at all
times and can greatly aid in saving time during initial startup
and troubleshooting.

Output Test

An API exclusive feature includes output test buttons for each
channel to provide a fixed output (independent of the input)
when held depressed.
Terminals are also provided to operate the test functions
remotely for each channel. This also allows use as a remote
manual override to provide a temporary fixed output if desired.
The test output level for each channel is potentiometer adjust-
able from 0 to 100% of the output span. The output test greatly
aids in saving time during initial startup and/or troubleshooting.

Universal

Power

Input LoopTracker

LED for Each

Channel

Two Channel Signal Converter/Isolator/Transmitter

APD 2051

Channel 1: Bridge/Strain Gauge/Load Cell to DC

Channel 2: RTD Temperature to DC

Two Independent Channels with Full Isolation

Zero and Span for Each Output

Input and Output LoopTracker

LEDs

Output Test/Manual Override for Each Channel

Built-In I/O Power Supplies

Monitor Weight or Pressure and Temperature

Convert/Isolate Dual Output Transmitters

Applications

Channel 1 Bridge Input Range

Factory configured, please specify sensor mV/V and mV range
Sensor range:

0-1 mV to 0-2000 mV

Millivolt output range is determined by the sensitivity of the
sensor (mV/V) and the excitation voltage applied.

mV/V sensitivity X excitation voltage = total mV range

Input impedance:

1 M

Ω

minimum

Input com. mode rejection: 100 dB minimum

Channel 1 Excitation Voltage

Range:

4 to 10 VDC factory set, please specify

Adjustment:

±10% via front potentiometer

Maximum output: 10 VDC maximum at 30 mA
Stability:

±0.01% per °C

Designed for one 350

Ω

(or greater) sensor

Channel 2 RTD Input Range

Factory configured, please provide complete sensor specifica-
tions and temperature range. 100°F (55°C) minimum span.
RTD input:

Resistance at 0°C
Curve (385, 3916, 392 etc.)
Temperature range in °F or °C

RTD resistance: Typically 10

Ω

to 2000

Ω,

2 or 3 wire

Excitation current: Typically 10

Ω

: 10 mA, 100

Ω

: 2 mA,

1000

Ω

: 0.5 mA, 2000

Ω

: 0.2 mA

Leadwire comp.: < ±0.05% of span per 1

Ω

change in

leadwire resistance, 3 wire sensor

LoopTracker

Variable brightness LEDs indicate I/O levels for each channel

Channel 1 and Channel 2 Output Ranges

Factory configured, please specify for each output channel
Voltage:

0-1 VDC to 0-10 VDC, 10 mA max
up to 20 VDC with M19, M29, M39

Bipolar voltage: ±1 VDC to ±10 VDC
Current:

0-1 mADC to 0-25 mADC, 4-20 mADC
20 V compliance, 1000

Ω

at 20 mA

Output Calibration

Multi-turn zero and span potentiometers for each output channel
±15% of span adjustment range typical

Output Characteristics

Linearity:

±0.1% of span

Temperature stability:

Better than 0.04% span/°C

Output ripple and noise:

Less than 10 mV

RMS

Isolation

Full 5-way, 1200 V

RMS

minimum

Response Time

70 milliseconds typical

Output Loop Power Supplies

20 VDC nominal, regulated, 25 mADC for each output channel
May be selectively wired for sinking or sourcing mA output

Output Test

Front buttons set each output to test level when pressed
Each test level potentiometer adjustable 0-100% of span

Installation Environment

Mount vertically to a 35 mm DIN rail
For use in Pollution Degree 2 Environment
IP 40 housing, requires installation inside an enclosure
–10°C to +60°C operating ambient

Connectors

Eight 4-terminal removable connectors, 14 AWG max wire size

Power

85-265 VAC, 50/60 Hz or 60-300 VDC, 6 W maximum
D versions: 9-30 VDC or 10-32 VAC 50/60 Hz, 6 W maximum

Options—add to end of model number
R1

Channel 1 I/O reversal (i.e. 20-4 mA out)

Channel 2 I/O reversal (i.e. 20-4 mA out)

Channel 1 and channel 2 I/O reversal

M19

Channel 1 high voltage output >10 V up to 20 V

M29

Channel 2 high voltage output >10 V up to 20 V