2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com

4/2001

Model 430 Bridgesensor

430 Simplified Block Diagram

Features

Complete Sensor Signal Conditioner with

Current Output

115 Volts AC is all that is required

Adjustable Voltage Excitation Supply

Adjustable Gain Amplifier for Sensor Full Scale

Outputs from 10 to 50 mV

Zero Current Adjustable from 0 to +12 mA

4-20, 0-20, or 12 ±8 mA Operation

Rugged Epoxy Encapsulated Self Contained Unit

with Screw Terminal Connections

Applications

Process Control Add-on Loops

Can be used with All Types of Low Output Sensors

Differential Sensors

Description

The Model 430 is a current output signal conditioner, complete

with a true differential input instrumentation amplifier, and a

highly stable bridge excitation supply. It is powered from the

AC line. The input amplifier incorporates a two pole roll off, 3

Hertz filter to reduce the influence of mechanical noise and

power line interference on the input. The unit is encapsulated

in an epoxy filled plastic container with through bolt mounting

holes and screw terminal barrier strips for easy attachment of

all wires.

2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com

4/2001

Model 430 Bridgesensor

Specifications

NOTE: Unless otherwise noted, specifications apply after 1 hour

warm-up at 25°C ambient, gain set between 320 and 1600 mA/V.

Getting Started with the Model 430

I. Hook Up Procedure

A. Connect the + out of your load cell to the +INPUT,

pin 10.

B. Connect the -out of your load cell to the -INPUT,

pin 11.

Note: If the ±SENSE are not used in your load cell application,

the connections in step C & D need to be followed. If

the ± SENSE are going to be used, do not jumper

them as described in steps C & D.

C. Connect B+, pin 4, to the +excitation of your load cell

and jumper the +SENSE, pin 3, to B+, pin 4.

D. Connect B-, pin 2, to the -excitation of your load cell

and jumper the -SENSE, pin 1, to B-, pin 2.

E. Connect the VAC power supply to the AC input lines,

pins 6 and 7.

II. Turn On Procedure

A. Verify that the hook up procedure is complete.

B. Verify the correct AC voltage is applied to the 430; i.e.

100, 115, 220, 230.

C. Turn on the AC source supply to the 430.

D. Set the required EXCITATION supply voltage to the

load cell by adjusting B+ ADJUST.

III. Calibration Procedure for Zero

Current Adjustment

A. Jumper the + and - input terminals, pins 10 and 11,

together.

B. Connect an amp meter across the output, pins 8 and

C. Adjust the COARSE OFFSET and the FINE OFFSET

potentiometers for the desired ZERO current.

IV. Full Scale Current Adjustment

A. Remove the jumper between the + and - input terminals

and apply a known load to your load cell, in most

cases it would be 100% of full scale.

B. Adjust the COARSE GAIN and FINE GAIN

potentiometers for the desired FULL SCALE output.

C. Calibration is now complete. However, the user should

recheck the ZERO & FULL SCALE current output

before continuing.

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