Complete Strain Gage Bridge Signal Conditioner Isolated 4-20 0-20 Outp

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Complete Strain Gage Bridge Signal Conditioner Isolated 4-20 0-20 Outp

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Model Bridgesensor
Complete Strain Gage Bridge Signal Conditioner Isolated 4-20 0-20 Output Output Capable Driving 1000 Loop Bridge Balance with Tare Offset Capability High Gain Amplifier; Accept Full Scale Live Load Signals Provide Output Span Excitation Supply Capable Driving Four Load Cells Powered Rugged Epoxy Encapsulated Design
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.
Applications
Weighing with Load Cells Process Control Add-on Loops Used With Types Output Sensors
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
eco# 040325-2, 4/2001
Model Bridgesensor
Specifications
NOTE: Unless otherwise noted, specifications apply after hour warm 25°C ambient. Temperature coefficients apply between 55°C ambient.
Isolation Input Output Amplifier Gain Adjustment Range Input Output Linearity Temperature Stability Input Noise Tare Adjustment Range Bridge Offset Input Resistance Differential Common Mode Common Mode Rejection, Common Mode Input Output Zero Adjust Temperature Coefficient Current Output Span Compliance Voltage Current Loop Resistance 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 RMS, maximum VAC, ±10V 50/60 VAC, ±10% 1100 Volts -25°C +55°C -25°C +85°C (510 grams) 3.75" 2.0" 2.87" (9.53 7.62 1000 megohm minimum Volts 1µA/°C Volts 1000 ohms Hertz, Pole Roll Volts Typical 10.2V ±2.5% Typical 0.02% maximum 60pF
Getting Started with Model
Excitation Supply. remote sensing used, connect +Sense +Excitation, terminal connect -Sense -Excitation, terminal 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 connect load cell Model Excitation terminals Amplifier Inputs. Turn power 433. Turn SWA-3 "ON". output ZERO current with 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. SWA-2 "OFF" SWA-2 "ON" output ZERO. Adjust potentiometer desired ZERO current. Turn SWA-3 "OFF". Expect output current change.
±0.01% Full Scale (0.005%/°C)
(Equals F.S. mV/V cell)
Apply load dead weight load cell. Adjust TARE potentiometers same ZERO current Step SWA-1 "OFF" provides bridge output balance -3mV +15mV, "ON" between +15mV +25mV. Apply full scale load adjust SPAN (GAIN) potentiometer desired full scale output current. Range switches SWA-4 SWA-5 required. Remove full scale load check ZERO output current. Adjust FINE TARE potentiometer required. Recheck full scale Step End.
Note: amplifier used without using Excitation Supply, external power supply side must connected -EXCITATION terminal Model 433, inputs must tied terminal -EXCITATION. This provides return path finite amplifier input current.
Amplifier
amplifier true differential input, drift Instrumentation Amplifier with less than 100pA input current. common mode range Volts with respect EXCITATION supply terminal minimum 100dB rejection
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
eco# 040325-2, 4/2001
Model Bridgesensor
common mode voltage. input amplifier excitation supply isolated from line current output. isolated output current source compliance Volts allow Model operate with zero 1000 Ohms loop resistance.
Control Switch
Tare Weight Compensation
Model different zero controls. called OUTPUT zero with SWA2. 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 Current 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 common, 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.
Excitation Voltage
Terminal Strip Assignments
Screw Terminal Function Screw Terminal Function
SWB-1
Excitation Voltage Fixed Volts Adjustable
-SENSE -EXCITATION +SENSE +EXCITATION
+SIGNAL -SIGNAL OUTPUT RETURN
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
eco# 040325-2, 4/2001
Model Bridgesensor
2401 Stanwell Drive Concord, California 94520 925/687-4411 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
eco# 040325-2, 4/2001

Complete Strain Gage Bridge Signal Conditioner Isolated 4-20 0-20 Outp

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