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AP4081-0000
Action PAK
®
AP4081
Bridge Input, Field Configurable Isolator
Provides an Isolated, DC Output in Proportion
to a Bridge/Strain-Gauge Input
Adjustable Bridge Excitation 1 to 10V with up to
120mA drive
11 Field Configurable Input Ranges:
10mV to ±200mV (0.5mV/V to > 50mV/V)
Description
The Action Pak AP4081 is a bridge or strain-gauge input signal
conditioner with 1500VDC isolation between input, output and
power. The field configurable input and output offer flexible, wide
ranging capability for bridge or strain-gauge input applications
from 0.5mV/V to over 50mV/V.
Wide-ranging, precision zero and span pots allow 50% adjustablity
of offset and gain within each of the 11 switch selectable input
ranges. The output can be set for either 0-5V, 0-10V, 0-1mA or 420mA. This flexibility, combined with an adjustable (1 to 10VDC)
bridge excitation source, provides the user a reliable, accurate
instrument to isolate and condition virtually any bridge or straingauge input.
Application
The Action Pak AP4081 field configurable, bridge input signal
conditioner is useful in isolating ground loops and interfacing
bridge sensors to data acquisition and control systems.
Three way isolation completely eliminates ground loops from any
source. Isolation protects expensive SCADA systems from ground
faults and provides filtering for noise reduction, which can be a
significant problem with small millivolt bridge signals.
Wide ranging flexibility allows the user to easily zero out deadloads in weighing systems or configure bipolar input ranges for
expansion-compression or vacuum-pressure bridge applications.
The convenient Action Pak is easy to install, using sockets suitable
for surface mount, DIN rail mount or snap track mount. Troubleshooting is easy since no wires need to be removed when swapping
units. The wide ranging power supply accepts either 120 or
240VAC power.
4 Field Configurable Output Ranges:
0-5V, 0-10V, 0-1mA, and 4-20mA
Plug-in Installation
Selectable 120/240VAC Input Power
Configuration
A major advantage of the AP4081 is its wide ranging capabilities
and
ease of configuration. The AP4081 has 11 input range switch
settings. Trim potentiometers allow 50% input zero and span
adjustablity within each of the 11 full-scale, input ranges.
For example, the 200mV switch setting in Table 1 configures the
input for a 0 to 200mV range. The span can be contracted by 50%
which enables an input span of 100mV. This 100mV span can be
positioned anywhere within the 0-200mV range. The zero offset
can be as large as 50% of the full scale range (e.g. 100 to 200mV
range), which can be useful to tare out a dead load in weighing
applications.
Unless otherwise specified, the factory presets the Model AP4081
as follows:
Input Setting: 0 to 50mV
Adjusted Range: 0 to 30mV (3mV/V)
Excitation: 10V
Operation: Direct
Output: 4 to 20mA
Power: 120VAC
For other I/O ranges refer to Tables 1 through 4 and reconfigure
switches SW1 and SW2 for the desired input range, function,
excitation and output range.
Warning: Do not attempt to change any switch settings with power
applied. Severe damage will result!
Diagnostic LED
The AP4081 is equipped with a dual function LED signal monitor.
The green, top mounted LED indicates both line power and input
signal status. Active line power is indicated by an illuminated LED.
If the input signal is more than 110% of the full-scale range, the LED
will flash at 8Hz (or 4Hz when input < 0%).
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Calibration
1. Connect the input to a calibrated millivolt source, load the
excitation supply with the bridge or an equivalent load and apply
power. Wait at least 15 minutes for thermal stability before
monitoring the voltage/current.
2. Adjust excitation to the desired level.
3. Set the calibrator to the desired minimum input and adjust the
zero potentiometer for minimum output.
Table 2: Direct or Reverse Operation Setting
4. Set the calibrator to the desired maximum input and adjust the
span potentiometer for maximum output.
5. Repeat steps 3 and 4, as necessary for best accuracy.
Table 1: Input Range Selector-Switch settings
Table 3: Bridge Excitation Selector-Switch Settings
Table 4: Output Range Selector-Switch Settings
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WARNING: Do not attempt
to change any switch
settings with power applied.
Severe damage will result!
Figure 1: Factory Calibration; 0 to 50mV
(calibrated to 0-30mV), 10V excitation, Direct, 4-20mA.
Mounting
All Action Paks feature plug-in installation. Model AP4081 uses an 11-pin
base, either molded socket (M011) or DIN rail socket (MD11).
Dimensions
Dimensions are in millimeters (inches)
Figure 2: 120/240 VAC Selection
M011 (Track/Surface)
Mark II
MD11 (DIN Rail)
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Specifications
Excitation (+)
-)
r
Input:
Voltage Input:
Full Scale Range: 10mV to ±200mV
(see Table 1)
Impedance: >1M ohms
Overvoltage:
400Vrms, max (Intermittent);
264 Vrms, max (Continous)
Common Mode (Input to Ground):
1500VDC, max
Zero Turn-Up:
50% of full scale range
Span Turn-Down:
50% of full scale range
Operation:
direct or reverse acting
Output:
Voltage Output:
Output: 0-5V, 0-10V
Impedance: <10 ohms
Drive: 10mA, max (1K ohms min. @ 10V)
Current Output:
Output: 0-1mA, 4-20mA
Impedance: >100K ohms
Compliance:
0-1mA; 10V, max (10K ohms max)
4-20mA; 15V, max (750 ohms max)
Bridge Excitation:
1 to 10VDC, 120mA max (84 ohms min)
Accuracy (Including Linearity, Hysteresis):
±0.1% typical, ±0.2% maximum of
selected range at 25°C.
Stability:
±0.025%/°C typical, 0.05%/°C maximum,
of selected range.
Output Noise (maximum):
0.1% of span, rms, or 10mV whichever is greater.
Response Time (10 to 90%):
<200mSec., typical.
Common Mode Rejection:
DC to 60Hz: >120dB,
>100dB on 0-1mA output range
Isolation:
1500VDC between input, output and
power.
ESD & Transient Susceptibility:
Meets IEC 801-2, Level 2 (4KV)
and IEC 801-4, Level 3
LED Indication (green):
Input Range
>110% input: 8Hz flash
<-10% input: 4Hz flash
Humidity:
Operating: 15 to 95%
non-condensing @ 45°C
Soak: non-condensing 90%
for 24 hrs @ 65°C
Temperature Range:
Operating: 0 to 60°C (32 to 140°F)
Storage: -25 to 70°C (-13 to 158°F)
Power:
Consumption: 3W typical, 6.5W max.
Standard: selectable 120/240VAC, ±10%,
50-60Hz
Weight:
0.80lbs
Agency Approvals:
CSA certified per standard C22.2
(File No. LR42272-64)
UL recognized per standard UL508
(File No. E99775)
Ordering Information
Specify:
1. Model: AP4081
2. Options: U, (see text)
3. Line Power (see specs.)(All power supplies are transformer-isolated
from the internal circuitry.)
4. C620 Custom Calibration? (see Options)
Accessories:
M801-0000 Retaining Spring
M011-A 11 pin Track Mount Socket
M004-0000 4 ft Long Channel Track
MD11-0000 11 pin DIN Mount Socket
Printed on recycled pape
Bridge (+)
Excitation (
Bridge (-)
Figure 3: Bridge Reference Designations
Pin Connections
1 AC Power (Hot)
2 No Connection*
3 AC Power (Neu)
4 Bridge (+)
5 Bridge (-)
6 No Connection*
7 Excitation (+)
8 Excitation (-)
9 Output (+)
10 Output (-)
11 No Connection*
*Pins 2, 6 and 11 should NOT be used as terminations for other wires.
Connections at these terminals will decrease isolation levels.
Action Instruments
Chessell
Eurotherm
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