DN550-50
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PI CONTROLLER circuit - PI CONTROLLER circuit
DN550-50 - DN550-50
TECHNICAL DATA Designers' Data Sheet MINIATURE TEMPERATURE CONTROLLER FOIL CARTRIDGE HEATERS
DN550-50 temperature controller systems using resistive heating elements such cartridge foil heaters. This device operates from Volt D.C. power source deliver maximum Watts power Ampere current heater. DN550-50 operates with negative temperature coefficient (NTC) thermistor Proportional Integral (PI) control loop that provides better than 0.1°C system temperature stability. DN550-50 temperature controller supplies exact amount D.C. current required keep system correct temperature. result, does inject switching noise into system like "on-off" "pulse width modulated (PWM)" controllers often
DN550-50
BLOCK DIAGRAM
CONTROL CIRCUIT
COM.
DN550-50 controller consists temperature sensing bridge, amplifier, power stage. heater element remotely located from controller. temperature sensing bridge made equal resistors (internal DN550-50), thermistor that located close proximity heating element, external temperature resistor. bridge, amplifier, power stage form control loop that forces power stage deliver enough power heating element until thermistor resistance (RT) equals temperature resistor (RS). external capacitor (CT) provides loop integrating capability that provides temperature stability 0.1°C better. capacitor value provides loop intergrating time constant seconds 10µF capacitor provides seconds. integrating capacitor determined through experiments provides integrating time constant approximating thermal time constant object being heated. temperature object being heated, select temperature resistor (RS) that equal value thermistor (RT) desired program temperature. DN550-50 dissipate maximum Watts when properly attached heat sink that thermal resistance Watt less. Minimum Heater Resistance Power Supply Voltage Minimum Heater Resistance (Min) Ohms Minimum Temperature Resistance Power Supply Voltage VOLTS Ohms RS(MIN) OHMS 1,000 1,250 1,750 2,500 5,000
(Min)
Safe Operating Area Unsafe
Supply Voltage (Vs) Volts
Copyright 2000 ThermOpticsTM, Inc. rights reserved.
11-4-96
DN550-50
DN550-50 ELECTRICAL HOOK-UP DIAGRAM Common Volts Thermistor Heater (RH) Integrating Capacitor Temperature resistor
DN550-50 Marking
DAWN XXXX DN550-50
Date Code
MECHANICAL DIMENSIONS
0.130" 0.400" CLEARANCE HOLE 4-40 SCREW
PINS 0.100" CENTERS 0.800
ATTACH THIS SURFACE HEAT SINK
0.600" 0.800
0.350"
11-4-96
1004 Mallory Carson City, 89701 (775) 882-7721 (775) 882-7675 E-mail: info@thermoptics.com http://www.thermoptics.com
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