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Instructions
Installation Precautions
WARNING! All wiring must be performed by a qualified electri-
cian or instrumentation engineer. Consult factory for assistance.
The module is designed to be mounted in a housing or panel.
Mount the socket to a 35 mm DIN rail or suitable surface.
Avoid shock hazards! Turn signal input, output, and power off
before connecting or disconnecting wiring. Connect power last.
Input Terminals
Refer to wiring diagram at right and strain gauge manufac-
turer's data sheet for wiring and color coding. Polarity must
be observed when connecting inputs. Connect up to 4 strain
gauges or load cells. Sensor shield wire (if equipped) should
be grounded at one end only.
Excitation Voltage Connection
Polarity must be observed. Never short the excitation leads
together. This will cause internal damage to the module.
Signal Output Terminals
Polarity must be observed when connecting the signal output.
Current output provides power to the output loop (sourcing).
Module Power Terminals
The module operating voltage shown on the white model/serial
number label must match available power. AC power can be
connected with either polarity. Polarity MUST be observed for
DC powered modules.
V
–
EX
V
–
V
0
0
V
+
EX
Excitation
(–)
(+)
8
7
6
5
Socket
top view
Key down
when panel
mounting
9
10
11
1
Module
Output
(+)
(–)
power
PLC,
Power
Display,
AC or
Recorder,
DC+
Etc.
When using the mA output
the API 4058 G provides
20 V power for the loop
Excitation Voltage and Range Selection
The API 4058 G excitation voltage, input, and output are switch
selectable via rotary switches and a slide switch on the side
of the module. Common ranges are listed on the module label.
Excitation Fine Adjust
4
C
A
Excitation
B
Offset
Volt/Curr
Select
Output
V
I
E
D
BSOLUTE
Output
Switches
BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE BCDE
Input
E10V E11V E12V C12V E13V E15V C15V E16V E18V E19V E10I C12I E13I E15I C15I E16I
0-5 mV
±10 mV
E90V E91V E92V C92V E93V E95V C95V E96V E98V E99V E90I C92I E93I E95I C95I E96I
0-10 mV
±20 mV
E30V E31V E32V C32V E33V E35V C35V E36V E38V E39V E30I C32I E33I E35I C35I E36I
0-20 mV
E50V E51V E52V C52V E53V E55V C55V E56V E58V E59V E50I C52I E53I E55I C55I E56I
0-25 mV
±30 mV
ED0V ED1V ED2V CD2V ED3V ED5V CD5V ED6V ED8V ED9V ED0I CD2I ED3I ED5I CD5I ED6I
0-30 mV
EB0V EB1V EB2V CB2V EB3V EB5V CB5V EB6V EB8V EB9V EB0I CB2I EB3I EB5I CB5I EB6I
0-40 mV
E00V E01V E02V C02V E03V E05V C05V E06V E08V E09V E00I C02I E03I E05I C05I E06I
0-50 mV
E80V E81V E82V C82V E83V E85V C85V E86V E88V E89V E80I C82I E83I E85I C85I E86I
0-100 mV
E20V E21V E22V C22V E33V E25V C25V E26V E28V E29V E20I C22I E23I E25I C25I E26I
0-200 mV
E40V E41V E42V C42V E43V E45V C45V E46V E48V E49V E40I C42I E43I E45I C45I E46I
0-250 mV
EC0V EC1V EC2V CC2V EC3V EC5V CC5V EC6V EC8V EC9V EC0I CC2I EC3I EC5I CC5I EC6I
0-300 mV
EA0V EA1V EA2V CA2V EA3V EA5V CA5V EA6V EA8V EA9V EA0I CA2I EA3I EA5I CA5I EA6I
0-400 mV
A60V A61V A62V AE3V A63V A65V AE6V A66V A68V A69V A60I AE3I A63I A65I AE6I A66I
±500 mV
E60V E61V E62V C62V E63V E65V C65V E66V E68V E69V E60I C62I E63I E65I C65I E66I
0-1000 mV
EE0V EE1V EE2V CE2V EE3V EE5V CE5V EE6V EE8V EE9V EE0I CE2I EE3I EE5I CE5I EE6I
0-1200 mV
Excitation 10V 9V 8V 7V 6V 5V 4V 3V 2V 1V 0V
Switch A
A
1. See table above and set Excitation rotary switch A to the
Strain
+
desired voltage. The excitation voltage should match the
gauge
sensor manufacturer's recommendations.
2. From the table, find the switch combination that match your
input/output range and set rotary switches B, C, and D.
3. Set the Volt/Curr slide switch E to V for voltage or I for cur-
rent, depending on the output type.
Calibration
(–)
(+)
Signal
Top-mounted Zero and Span potentiometers are used to
fine-tune the output signal. An excitation voltage fine adjust
potentiometer is located on the side of the module.
4
This procedure and does not account for offsets or tare weight
calibration. To achieve optimum results, it is recommended
that the API 4058 G be calibrated using an accurate bridge
simulator before being placed in service.
1. Apply power to the module and allow a minimum 20 min-
ute warm up time.
2
3
2. Measure the voltage across terminals 7 and 8 and adjust
the excitation voltage fine adjust potentiometer for the
exact voltage desired.
3. Provide an input to the module equal to zero or the mini-
mum input required for the application.
Power
4. Using an accurate measurement device for the mod-
AC or
ule output, adjust the Zero potentiometer for the exact
DC–
minimum output desired. The Zero control should only be
adjusted when the input signal is at its minimum. This will
produce the corresponding minimum output signal.
5a. Span calibration for standard models.
Set the input at maximum, and then adjust the Span
potentiometer for the exact maximum output desired. The
Span control should only be adjusted when the input sig-
nal is at its maximum. This will produce the correspond-
ing maximum output signal.
5b. Span calibration with M01 option only
The M01 option uses a shunt resistor installed internally in
the API 4058 G. The resistance is specified by the trans-
ducer manufacturer. Before starting calibration, ensure
that the correct resistance value was specified.
The sensor manufacturer should provide the percentage of
full-scale output for the transducer when using the internal
4
resistor for calibration (typically 80%).
i. Set the Test toggle switch to the Test position. The
C
internal shunt resistor is switched into the circuit to
Input
unbalance the bridge.
ii. Adjust the Span pot for an 80% full-scale output or 80%
4058G
reading on the process indicator.
iii. Return the TEST switch to the opposite position and
readjust the zero pot if necessary.
ROCESS NSTRUMENTS, Inc.
0-1
0-2
0-4
1-5
0-5
0-8
V
V
V
V
V
V
A33V
AB3V
A03V
9
8
7
6
5
4
3
2
1220 American Way Libertyville, IL 60048
Phone:
800-942-0315
2-10
0-10
±5
±10
0-2
2-10
V
V
V
V
mA
mA
A36V A38V A39V
AB6V AB8V AB9V
A06V A08V A09V
6. The calibration procedure should be repeated several times
to achieve the desired accuracy over the selected range.
1
0
Output Test Function
Note that models with the M01 option do not have a TEST
function. With this option the Test switch operates the calibra-
tion resistor and the Test Cal. potentiometer is non-functional.
The output test potentiometer is factory set to provide approxi-
mately 50% output. When the test button is depressed it will
drive the output with a known good signal that can be used as
a diagnostic aid during initial start-up or troubleshooting. When
released, the output will return to normal.
The Test Cal. potentiometer can be used to set the test output
to the desired level. It is adjustable from 0 to 100% of the
output span. Press and hold the Test button and adjust the Test
Cal. potentiometer for the desired output level.
Operation
Strain gauges and load cells are normally passive devices that
are commonly referred to as bridges due to their four-resistor
Wheatstone bridge configuration. These sensors require a
precise excitation source to produce an output that is directly
proportional to the load, pressure, etc. that is applied to the
sensor.
The exact output of the sensor (measured in millivolts) is
determined by the sensitivity of the sensor (mV/V) and the
excitation voltage applied. For example, a load cell rated for 3
mV/V sensitivity and 10 VDC excitation will produce an output
of 0 to 30 mV for load variations from 0 to 100%.
3 mV/V sensitivity X 10 VDC excitation = 30 mV range
The API 4058 G provides a precise excitation voltage to the
sensors and receives the resulting millivolt signal in return.
This input signal is filtered and amplified, then offset, if
required, and passed to the output stage. Depending on the
output configuration selected, a DC voltage or current output
is generated.
®
GREEN LoopTracker
Input LED – Provides a visual indica-
tion that a signal is being sensed by the input circuitry of the
module. It also indicates the input signal level by changing in
intensity as the process changes from minimum to maximum.
If the LED fails to illuminate, or fails to change in intensity as
the process changes, this may indicate a problem with module
power or signal input wiring.
RED LoopTracker Output LED – Provides a visual indication
that the output signal is functioning. It becomes brighter as the
input and the corresponding output change from minimum to
maximum. For current outputs, the RED LED will only light if
the output loop current path is complete. For either current or
voltage outputs, failure to illuminate or a failure to change in
intensity as the process changes may indicate a problem with
the module power or signal output wiring.
API maintains a constant effort to upgrade and improve its
products. Specifications are subject to change without notice.
Consult factory for your specific requirements.
api-usa.com
Fax: 800-949-7502
API 4058 G
0-10
0-16
4-20
0-20
mA
mA
mA
mA
A35I
AB5I
A05I
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