Signal Consulting, LLC  Model Si82Hy2ZPTC

 Hybrid Two-Zone Proportional Temperature Controller with Two AC 120/240V-5A Solid-State Relays, 4-Key and LCD Port, Y-Chip

Si82Hy2ZPTC Features:   Efficient Two-Zone Proportional Temperature Controller in   the range of +50C to +1020C with 1/20C Steps   An LCD port (with HITACHI HD44780 Interface Standard) for Set and Measured Temperature Display. Two 120/240V, 5A AC Solid-State Relays for Heaters Two Digital Thermometer  with 1/20C Accuracy Two Analog ( 0 to +5V) Set-Temperature Voltages or Pots High Power-Efficiency: 98.5% typical, at 120V and 20A On Board: Rectifier and Filter Capacitors VTS diodes Two LEDs as Heater-On Indicators (one for each zone) Voltage Requirement: A single (9V to 20V) AC or DC Voltage (unregulated and Unfiltered) for Board-Control Voltage Si82Hy2ZPTC  Spec Sheet  (PDF)

The Si82Hy2ZPTC-120/240Vac-5A is a versatile, closed-loop, microprocessor based, Hybrid, Two-Zone, Proportional Temperature Controller board that can control two independent thermal-zones. By proportional control, we mean that the amount of correction used in the closed-loop is proportional to the difference between the set and measured temperature values. Five PWM duty-cycle values are used depending on the absolute-value of the difference between the set and measured temperature values (|Td|). The duty-cycle is 0% when |Td|=0⁰C; 25% when 0⁰C< |Td|<0.5⁰C; 50% when 0.5⁰C< |Td|<1⁰C; 75% when 1⁰C< |Td|<1.5⁰C; 100% when |Td|>1.5⁰C.  Two120/240Vac, 5A solid-state relays (one for each zone) is used to control the currents in resistive heaters (600W in each zone). A single AC or DC voltage source (9V to 20V rang, unregulated and unfiltered) is required for the control electronics. The onboard microprocessor measures and controls the temperatures, and monitors the user inputs. Two small 9-bit digital thermometers (by Dallas Semi., DS18S20 sensor, connected to ports CN4TS1 and CN5TS2) are used to measure temperatures in the +5⁰C to +102⁰C range, with ½⁰ C accuracy. Because each sensor is digital, it is virtually immune to noise and loading; ideally suited for remote sensing. This sensor uses a unique “1-wire interface” (with parasite power mode) that requires only 2-conductors for reliable remote (long as 20 meters) temperature sensing. As the name hybrid (Hy) implies the desired set-temperatures are derived from a variable, analog voltages (V_P1,G, V_P2,G ) while the other control signals are digital. An LCD port (with HITACHI HD44780 Interface Standard) is provided for optional display of Set and Measured Temperatures data in 2 line x 20 character format. Two red LEDs are used to monitor the Heater currents. A small Aluminum plate (3.3”x4.0”x0.065”) is required to operate at 2x600W power level. Typical applications are: Dual Water-Baths, 2-Zone Heat-Pumps, etc. This board can be configured and programmed to perform efficiently in many customized applications.

A Typical Application of the Si82Hy2ZPTC-120/240Vac-5A

In this closed-loop proportional temperature control application, the Set-Temperature (in the, +5⁰C to +102⁰C Range with 1/2⁰C steps) is adjusted (for each zone) by two external linear taper 5KW potentiometers, Signal as Si5Pot2-2x5k. The resistive Heaters are operating with 120Vac at 5A max. A small transformer with 12Vac output provides the control-power to this board. The temperature in each zone is measured with the Dallas Semi.  www.dalsemi.com  (DS18S20 in TO-92 casing) Digital Thermometer. This sensor can be purchased from Signal Consulting, LLC as Si18DTsens (sensor with 12” leads and connector) or you can wire-up your own sensor using parts from www.digikey.com . The LCD module can be purchased from Signal as Si24LCD2L20CH , or from several vendors; for OEM pricing, contact: Sunlike Display Tech Corp. in Taiwan, www.lcd-modules.com.tw .

Availability: We usually ship in 2-3 business days.

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