Complete Strain Gage Bridge Signal Conditioner Isolated Volt Output Br
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Model Bridgesensor
Complete Strain Gage Bridge Signal Conditioner Isolated Volt Output Bridge Balance with Tare Offset Capability Excitation Supply Capable Driving Four Load Cells Powered Rugged Epoxy Encapsulated Design
Applications
Weighing with Load Cells Frequency Strain Measurements Process Control Pressure Transducers Used With Types Output Sensors
Description
Model self contained, powered signal conditioner bridge type instrumentation. contains precision instrumentation amplifier with isolated, filtered output highly regulated, noise, adjustable output bridge excitation source. unit completely encapsulated rugged environments.
Block Diagram
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001
Model Bridgesensor
Specifications
NOTE: Unless otherwise noted, specifications apply after hour warm 25°C ambient. Temperature coefficients apply between 55°C ambient.
Getting Started with Model
Excitation Supply. remote sensing used, connect +Sense +Excitation, terminal connect -Sense -Excitation, terminal These connections must made adjust supply step Apply power Model adjust Excitation supply. Turn SWB-1 "ON" fixed Volts. This will supply 10.2 ±2.5% provide best temperature stability. voltages between Volts, place SWB-1 "OFF" position Excitation Supply with potentiometer SWB-2 either position. Turn power Model "OFF" connect load cell Model Excitation terminals Amplifier Inputs. Turn power 463. Turn SWA-3 "ON". output ZERO) Select expected full scale signal range according table with SWA-4 SWA-5. output from load cell known, both SW-4 SW-5 "ON" 40-50mV range. Select required ZERO output range. SWA-2 "ON" zero Volts SWA-2 "OFF" Volts. Adjust potentiometer Volts. Turn SWA-3 "OFF". Expect output change.
Isolation Input Output Amplifier Gain Adjustment Range Input Output Linearity Temperature Stability Input Noise Input Offset Temperature Coefficient Tare Adjustment Range Bridge Balance Referred Input Temperature Coefficient Input Resistance Differential Common Mode Common Mode Rejection 60Hz Common Mode Input Output Zero Adjust Temperature Coefficient Referred Output Output Voltage Range Current Frequency Response, -3dB Response Time Rise Time 0.1% Final Value Bridge Supply Voltage Adjustment Range Temperature Coefficient Fixed Temperature Coefficient Load Current Regulation Load Line Output Noise Bandwidth Input Optional Line Isolation Capacitance Dielectric Withstand Environment Ambient Operating Storage Weight 60pF
2000 ±0.005% Full Scale (0.005%/°C) 0.5µV/°C typical
-3mV +25mV Equals F.S. 3mV/V cell 1µV/°C typical
1000 megohm
minimum Volts maximum Volts 0.3mV/°C typical Volts maximum pole Volts PPM/°C typical 10.2V ±2.5% PPM/°C typical 0.02% maximum RMS, maximum VAC, ±10V 50/60 100, VAC, ±10% typical 1100 Volts -25°C +55°C -25°C +85°C (510 grams) 3.75" 2.0" 2.87" (9.53 7.62
Apply load dead weight load cell. Adjust TARE potentiometers same ZERO output Step SWA-1 "OFF" provides bridge output balance -3mV +15mV, "ON" between +15mV +25mV, referred amplifier input. This adjustment does change output bridge. Apply full scale load adjust SPAN (GAIN) potentiometer desired full scale output. Range switches SWA-4 SWA-5 required. Remove full scale load check ZERO output. Adjust FINE TARE potentiometer required. Recheck full scale Step End.
Note:
amplifier used without using Excitation Supply, external power supply side must connected -EXCITATION Model 463, inputs must tied -EXCITATION. This provides return path finite amplifier input current.
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001
Model Bridgesensor
Amplifier
amplifier true differential input, drift Instrumentation amplifier with less than 100pA input current. common mode range Volts with respect EXCITATION supply terminal minimum 90dB rejection common mode voltage. input amplifier excitation supply isolated from line output.
Control Switch
Tare Weight Compensation
Model different zero controls. called OUTPUT zero Volts Volts with SWA-2. other zero control called TARE. SWA-1 allows selection TARE ranges, -3mV 15mV +15mV +25mV. Potentiometers available COARSE FINE TARE adjustments.
SWA-1 SWA-2 SWA-4 SWA-5
Tare Range -3mV Zero Voltage Span Range
Connecting Sensor
amplifier finite input current which must have return path amplifier power supplies. This path automatically provided when Model Bridge Excitation Supply used excite sensor. external supply used, side external supply must connected Model -EXCITATION, Terminal sure that common mode voltage limits observed. This would generally limit external power supply Volts assuming that half voltage would common mode, case when exciting full bridge. When full scale output sensor measured millivolts, millivolts, care must exercised wiring systems. millivolts full scale, each microvolt (10-6 Volts) contributes 0.01% full scale output. Wire connections generate microvolts potential contact potentials. These will also thermoelectric potentials thus vary with temperature differences. wires used connecting Model should same material. intervening connections made such terminal block, terminal block connecting points should have good thermal contact they will always same temperature thus cancel each other.
Mechanical Specifications
Transducer Excitation
bridge excitation supply voltage SWB-1 potentiometer SWB-1 fixed Volts. This will provide best temperature stability. supply adjusted between Volts setting SWB-1 adjusting potentiometer supply will deliver 120mA current voltage setting power four sensors.
Terminal Strip Assignments
Screw Terminal Function Screw Terminal Function
SWB-1
Excitation Voltage Fixed Volts Adjustable
-SENSE -EXCITATION +SENSE +EXCITATION
+SIGNAL -SIGNAL OUTPUT COMMON
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4/2001
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