DescriptioThe Model current output signal conditioner, complete with t

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DescriptioThe Model current output signal conditioner, complete with t

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Model Bridgesensor
DescriptioThe Model current output signal conditioner, complete with true differential input instrumentation amplifier, highly stable bridge excitation supply. powered from line. input amplifier incorporates pole roll off, Hertz filter reduce influence mechanical noise power line interference input. unit encapsulated epoxy filled plastic container with through bolt mounting holes screw terminal barrier strips easy attachment wires.
Complete Sensor Signal Conditioner with Current Output Volts that required Adjustable Voltage Excitation Supply Adjustable Gain Amplifier Sensor Full Scale Outputs from Zero Current Adjustable from 4-20, 0-20, Operation Rugged Epoxy Encapsulated Self Contained Unit with Screw Terminal Connections
Applications
Process Control Add-on Loops used with Types Output Sensors Differential Sensors Thermocouples
Simplified Block Diagram
2401 Stanwell Drive Concord, 94520-4841 (510) 687-4411 (510) 687-3333
http://www.calex.com
CALEX FaxFACTS:
1997
Model Bridgesensor
Specifications
NOTE: Unless otherwise noted, specifications apply after hour warm-up 25°C ambient, gain between 1600 mA/V. Amplifier Current Output Span Zero Adjust Minimum Output Temperature Coefficient Gain Adjustment Range 4-20 Output Linearity Temp Stability Gain Potentiometer Hysteresis Input Bias Current Offset Input Impedance Differential Common Mode Common Mode Rejection, Common Mode Input Maximum Input Output Compliance Voltage Current Loop Resistance Output Impedance Noise gain mA/Volt Hertz Frequency Response, Response Time Final Value 0.1% Final value External Reverse Current Maximum Output Current microamp 0.03% Full Output/°C ±0.05% Full Output ppm/°C max. 0.2% span max. nanoAmp max. nanoAmp max. 1000 megohms 90dB min. ±7.5 Volts Volts Volts ohms megohms, min. microamp RMS, max. Hertz, Poll roll typ. typ. 200mA max. (diode clamped common) typical
Getting Started with Model
Hook Procedure Connect your load cell INPUT, Connect your load cell INPUT, Note: SENSE used your load cell application, connections step need followed. SENSE going used, jumper them described steps
Connect excitation your load cell jumper SENSE, Connect excitation your load cell jumper SENSE, Connect power supply input lines, pins Turn Procedure Verify that hook procedure complete. Verify correct voltage applied 430; i.e. 100, 115, 220, 230. Turn source supply 430. required EXCITATION supply voltage load cell adjusting ADJUST. III. Calibration Procedure Zero Current Adjustment Jumper input terminals, pins together. Connect meter across output, pins Adjust COARSE OFFSET FINE OFFSET potentiometers desired ZERO current. Full Scale Current Adjustment Remove jumper between input terminals apply known load your load cell, most cases would 100% full scale.
Bridge Supply Volts Voltage Adjustment Range Voltage Load Current" curve limits Current Output Area 50/6 Area to125 Regulation Load Line 0.05% maximum Output Noise Bandwith Temperature Stability Potentiometer Hystersis Short Circuit Current Power Input Optional Line Isolation Capacitance Dielectric Withstand Environment Ambient Operating Storage Weight Size 0.5mV RMS, maximum 200ppm/°C 0.3% output maximum 600mA, typical VAC, ±10% 50/60Hz maximum 100, 50pF typical 1100 Volts +70°C -25° +85°C (510 grams) 3.75"L 2.0"W 2.87"H 9.53 7.62 (cm)
2401 Stanwell Drive Concord, 94520-4841 (510) 687-4411 (510) 687-3333
Adjust COARSE GAIN FINE GAIN potentiometers desired FULL SCALE output. Calibration complete. However, user should recheck ZERO FULL SCALE current output before continuing.
http://www.calex.com
CALEX FaxFACTS:
1997
Model Bridgesensor
Amplifier
input amplifier high input impedance, differential amplifier with built gain offset adjustment potentiometers. coarse fine gain pots enable Model interface with sensor full scale output from down offset potentiometers allow setting zero current from This range allows Model provide output spans bipolar. output compliance Volts which will allow several line process control detectors adding total ohms loop resistance. current output line clamped common line with diode prevent inadvertent inductive voltage spike from destroying unit. This diode conduct current surges less than
Bridge Excitation Supply
Bridge Excitation supply adjustable from Volts Volts. allowable load current limited internal power dissipation varies from Volts 100mA Volts. curve VOLTAGE CURRENT safe operating area. AREA range voltage current covers common bridges from ohms bridge supply capable driving load cells, providing that line voltage does drop below Reference AREA Voltage Load current. supply provisions remote sensing when excitation lines have significant resistance compared sensor. +SENSE -SENSE terminals must connected terminals respectively, i.e. connect terminals together, connect terminals together when remote sensing being used. More current drawn from EXCITATION supply than shown VOLTAGE CURRENT curve using resistor series with lead connecting +SENSE terminal sensor. This resistor should calculated produce voltage drop minus desired bridge voltage output close Volts. example, bridge would draw Volts, which outside safe operating area. 15-4=11 Volts drop across series resistor. 11V/0.1A=110 ohms. watt series resistor. temperature coefficient this resistor critical. Adjust Excitation supply Volts across sensor, i.e., between +SENSE -SENSE terminals.
Connecting Sensor
amplifier finite input current which must have return path amplifier common. This path automatically provided when Model Bridge Excitation Supply used excite sensor. some reason, external supply used excite sensor, side external supply must connected Model common, terminal Either positive negative side connected common, depending external supply connected rest your system. input common mode voltage pins Model must between ±7.5 Volts. When Full Scale output sensor measured millivolts, i.e. millivolts, care must exercised entire wiring system. millivolts full scale, each microvolt (10-6 Volts) contributes 0.01% full scale output. Wire connections generate microvolts potential Contact Potentials Thermoelectric Potentials. wires used making connections between sensor Model should same material. intervening connections made such terminal block, terminal block connecting points should have good thermal contact they will always same temperature.
Determining Amplifier GaiThe Model voltage input, current output amplifier. gain therefore described milliamps output volt input. Thus, change from span, with Volt change input, gain mA/Volt. Calculate required gain, from following equation:
Span Sensor Full Scale Output Volts
span 16mA sensor output voltage 16/0.05 volt.
VOLTAGE LOAD CURRENT
Zero Current Adjustment
Connect input terminals, together connect them COMMON, terminal Adjust COARSE FINE OFFSET potentiometers desired current. Since bridge general perfectly balanced, final ZERO adjustment should made with sensor connected amplifier required EXCITATION voltage set. ZERO adjustment should made about full scale output from sensor when setting ZERO 20mA span, since output current does negative.
VOLTAGE
BRIDGE SUPPLY
LOAD CURRENT
2401 Stanwell Drive Concord, 94520-4841 (510) 687-4411 (510) 687-3333
http://www.calex.com
CALEX FaxFACTS:
1997
SAFE OPERATING AREA
Model Bridgesensor
Mechanical Specifications
Terminal Strip Assignments Screw Terminal Function -SENSE B+SENSE USED Screw Terminal Function CURRENT OUTPUT AMPLIFIER +INPUT -INPUT EXT. GAIN EXT. GAIN
2401 Stanwell Drive Concord, 94520-4841 (510) 687-4411 (510) 687-3333
http://www.calex.com
CALEX FaxFACTS:
1997

DescriptioThe Model current output signal conditioner, complete with t

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