Absolute Process Instruments APD 4059 Series Quick Manual page 4

Calibration, Operation, Diagnostics, Load Cell Information
Calibration with Resistor Options M01 or M02
Use this calibration procedure if your APD 4059 was ordered
with a calibration resistor or if your sensor has its own internal
calibration resistor.
Note: Perform the following calibration procedure any time
switch settings are changed.
The M01 option uses a resistor installed internally in the APD
4059. The resistance is specified by the transducer manu-
facturer.
The M02 option is specified when the transducer incorporates
an internal calibration resistor. The transducer must be con-
nected per the manufacturer's specifications.
The sensor manufacturer should provide the percentage of
full-scale output for the transducer when using a calibration
resistor. This is often 80% of maximum output.
1. Apply power to the module and allow a minimum 20 minute
system warm up time.
2. Using an accurate voltmeter across terminals 10 and 12,
adjust the Excitation voltage potentiometer on front of the
APD 4059 for the exact voltage desired.
3. With the input set at zero or the minimum, adjust the Zero
potentiometer on front of the APD 4059 for a zero or low-
end output (for example, 4 mA for a 4-20 mA output).
4. The zero pot may also be adjusted for a zero reading on
the output display instrumentation, e.g. control system or
process indicator. Adjusting the zero pot this way eliminates
calibration errors in the display instrumentation.
5. Set the APD 4059 Test toggle switch to the Test position.
The calibration resistor is switched into the circuit to unbal-
ance the bridge.
6. Adjust the span pot to the for the % output specified by the
transducer manufacturer. This is often 80% of maximum
output.
7. Return the Test switch to the opposite position and readjust
the zero pot if necessary.
Diagnostic Voltage Measurements
Using a meter with at least 10 megaohm input impedance,
measure the voltage coming from the strain gauge at the loca-
tions shown. Sensitivity is measured in mV/V.
Typical Wiring Color Codes for Load Cells
Manufacturer + Exc. – Exc.
A & D Red White White
Allegany Green Black
American/Amcell Green Black
Artech Red Black
Beowulf Green Black
BLH Green Black
Cardinal Green Black
Celtron Red Black
Digi Matex Red White White
Dillon (DQ+) Green White White
Electroscale Red Black
Entran Red Black
EverGreen Green Black
Flintec Green Black
Force Measurement Red Black
Futek Red Black
General Sensor Red Black
GSE Red Black
HBM Green Black
HBM (PLC/SBE) Red Black
Interface Red Black
Kubota Red White White
LeBow Red Black
Mettler Toledo White White Blue
National Scale Green Black
NCI Red Black
A A P P
BSOLUTE BSOLUTE ROCESS ROCESS
Output Test Function
Models with the M01 or the M02 option do not have a Test
function. With either of these options the Test Cal. potentiom-
eter is non-functional.
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 factory set to approximately 50% out-
put. 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 deter-
mined by the sensitivity of the sensor (mV/V) and the excitation
voltage applied.
An additional input, the sense lead, monitors the voltage drop
in the sensor leads and automatically compensates the excita-
tion voltage at the module in order to maintain a constant
excitation voltage at the sensor.
The APD 4059 provides the 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 configu-
ration selected, a DC voltage or current output is generated.
GREEN LoopTracker
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.
Positive
Meter Lead
+ Exc.
+ Sig.
– Sig.
+ Sig.
Always consult manufacturer. Exceptions and/or custom wire colors exist!
+ Signal – Signal Shield + Sense – Sense
Green Blue Yellow
White White Red Bare
White White Red Bare
Green White White Bare
White White Red Bare
White White Red Yellow
White White Red Bare
Green White White Bare
Green Yellow Silver
Black Red Orange
Green White White Bare
Yel./Grn. White White
White White Red Bare
White White Red Yellow
Green White White Bare
Green White White
Green White White Bare
White White Green Bare
White White Red Yellow
Green White White Yellow
Green White White Bare
Green Blue Yellow
Green White White Bare
Green Black Orange Yellow
White White Red Yellow
White White Green Bare Yellow
I I
NSTRUMENTS NSTRUMENTS
® Input LED – Provides a visual indica-
Negative Meter Reading
Meter Lead No pressure/load
– Exc. Excitation Voltage
– Exc. + ½ Excitation Voltage
– Exc. + ½ Excitation Voltage
– Sig. Zero Volts
Manufacturer + Exc.
Nikkei Red
OmegaDyne Red, D, F Blk., C, E
Pennsylvania Orange
Philips Red
Presage Promotion Blue
Revere Green
Revere Red
Rice Lake Red
Sensortronic Red
Sensortronic (col.) Green
Sensotec/Honeywell Red
Sentran Red
SMD Red
Strainsert Red
Stellar STI Red
Stellar STI Red
Stellar STI A
Stellar STI A, B
T-Hydronics Red
Tedea Huntleigh Green
Thames Side Red
Toledo Green
Totalcomp Red
Red Transducer Tech. Red
Transducers Inc. Red
Blue Weigh-Tronix Green
1220 American Way Libertyville, IL 60048
Phone: 800-942-0315
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.
Meter Reading
Full pressure/load
Excitation Voltage
½ Excitation Voltage + (½ x Excitation Voltage x Sensitivity)
½ Excitation Voltage – (½ x Excitation Voltage x Sensitivity)
Excitation Voltage x Sensitivity
– Exc. + Signal – Signal Shield
Black Green White White Bare
Green A White White B Bare
Blue Green White White Bare
Blue Green Gray Bare
White White Red Black Yellow
Black White White Red Orange
Black Green White White Orange
Black Green White White Bare
Black Green White White Bare
Black White White Red Bare
Black White White Green Bare
Black Green White White Bare
Black White White Green Bare
Black Green White White Bare
Black White White Green Bare
Black Green White White Bare
D B C Bare
C, D F E Bare
Black Green White White Bare
Black Red White White Bare
Blue Green Yellow Bare
Black White White Red Yellow
Black Green White White Bare
A Black D Green C White White B Bare
Black Green White White Orange
Black White White Red Or./Wh.
api-usa.com
Fax: 800-949-7502
APD 4059
+ Sense – Sense
Blue Brown
G
Wh. Yellow Blue