Absolute Process Instruments APD 4059 Beknopte handleiding - Pagina 4

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Absolute Process Instruments APD 4059 Beknopte handleiding

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

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

Dillon (DQ+)

Green

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

LeBow

Red

Black

Mettler Toledo

White

Blue

National Scale

Green

Black

NCI

Red

Black

BSOLUTE

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

Red

Bare

White

Red

Bare

Green

White

Bare

White

Red

Bare

White

Red

Yellow

White

Red

Bare

Green

White

Bare

Green

Yellow

Silver

Black

Red

Orange

Green

White

Bare

Yel./Grn.

White

Red

Bare

White

Red

Yellow

Green

White

Bare

Green

White

Green

White

Bare

White

Green

Bare

White

Red

Yellow

Green

White

Yellow

Green

White

Bare

Green

Blue

Yellow

Green

White

Bare

Green

Black

Orange

Yellow

White

Red

Yellow

White

Green

Bare

Yellow

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, B

T-Hydronics

Red

Tedea Huntleigh

Green

Thames Side

Red

Toledo

Green

Totalcomp

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

Bare

Green

A White

White

Bare

Blue

Green

White

Bare

Blue

Green

Gray

Bare

White

Red

Black

Yellow

Black

White

Red

Orange

Black

Green

White

Orange

Black

Green

White

Bare

Black

Green

White

Bare

Black

White

Red

Bare

Black

White

Green

Bare

Black

Green

White

Bare

Black

White

Green

Bare

Black

Green

White

Bare

Black

White

Green

Bare

Black

Green

White

Bare

C, D

Bare

Black

Green

White

Bare

Black

Red

White

Bare

Blue

Green

Yellow

Bare

Black

White

Red

Yellow

Black

Green

White

Bare

Black D

Green

C White

White

Bare

Black

Green

White

Orange

Black

White

Red

Or./Wh.

api-usa.com

Fax: 800-949-7502

APD 4059

+ Sense – Sense

Blue

Brown

Wh.

Yellow

Blue