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    Soak Temperature Controller

    Soak Temperature Controller

    PART NO: 1706

    Single input, Single profile of 16 steps Ramp / Soak Programmable PID/On-Off Temperature Controller.

    PWHT Tech offers Microcontroller based multiple Ramp / Soak programmable PID temperature controller Model PRC-489 which is designed to improve reliability, accuracy and control for all temperature control applications. It features Ramp and Soak functions (the capability to control the temperature and its rate of change over a predetermined time span). Single pattern of total 16 (ramp/soak) steps can be programmed and stored in the memory. It can also be used as single set point control when the ramp/soak profile control is not desired. The controllers are calibrated for K type thermocouple.

    Control Outputs: PRC-489 offers both switching outputs in the form of SSR driver/Triac for external SSR
    or external load contactor and analog output in the form of (4-20) mA or (0-5) volt control signal, which
    can be used to control heater power through external Thyristor power regulator or switch. The analog
    outputs can be directly connected to PWHT Tech make single phase / three phase SCR based phase angle
    power regulators or zero cross over power switch.

    Additional one/two relays are also provided for time or temperature dependent event outputs as per
    the system requirement. The programmed profile and other parameters are retained in the nonvolatile
    memory in the event of power failure.

    Thermocouple Break Protection: In case of thermocouple break, the control can be transferred to
    manual mode to continue the heating cycle and user can alter the % of control output. The deviation hold feature assures guaranteed ramp. For quick heating from ambient temperature the hold feature is disabled in the very 1st ramp. Front Panel LED indicates start and end of the cycle, the status of heater output, status of heating ramp, soaking or cooling ramp. The unit of temperature measurement can also be selected as °C or F as desired.

    Auto Tracking Feature: In case of power failure during the normal heating cycle, the temperature is likely to drop. This controller has the special feature to auto track the heating rate on resumption of power supply. This is the unique feature of the controller and normally not available in other ordinary controllers. This feature is explained in the diagram as shown below.

    Master Slave Control Feature: For larger heating systems requiring more than one controller, the
    master/slave feature facilitates user to program one controller as master and others as slave. The slave
    controller will follow the program fed in the master controller. This facility allows uniform heating of
    the bigger jobs. The master slave configuration is achieved using RS485 interface as shown below. Out
    of many controllers any one controller can be configured as master controller and others as slaves. Single Master can control maximum 30 slave controllers.

     

    Features:
    Accepts standard K-type thermocouple. Control output of Triac / DC pulse / (4-20)mA/ (0-5)Volt. Servo start from the current process temperature. 1 to 16 programmable ramp/soak steps with rate programming facility.
    Master / Slave concept with 1 master and max. 30 slaves.
    Each controller can be configured as master or slave with 1 master and many slaves. Can be used as single set point control with online set point change facility.Auto Tracking feature to ensure same rate of heating/cooling even after power failure/resumption.Deviation hold above and below the set point for assured heating ramp and cooling ramp.

    Applications:
    Furnace/oven control
    PWHT and SR heat treatment cycle