Detailed Product Description

MODEL WISE DESCRIPTIONS:

PRODUCT DESCRIPTION:

Libratherm offers Microprocessor based Eight Zone PID Temperature indicator / Controller (Model PRC-8000) where accurate temperature control of multiple zone during Gradual Heating and Cooling is required. PRC 8000 is ideally suitable and is most economical as it eliminates the need for number of individual PID or ON/OFF Temperature Controllers required per zone. Each zone can be independently programmed for 16steps of Ramp/Soak profile. Each loop parameters like PID, Hysteresis,Deviation Hold, Facility to skip unused channel etc can be programmed from the user-friendly front panel membrane keyboard. The programmed profile and other parameters are retained in the non-volatile memory in the event of power failure.

PRC 8000 accepts 8 Thermocouples or RTD(Pt-100)3 wire inputs and can provide switching PID or ON/OFF Control output in the form of DC Pulses or SSR or relay to drive external load contact or drivers for heating and cooling. It can simultaneously provide 8analog PID control outputs in the form of (4-20)mA or (0-5)volt, which can beused to control heater power through Thyristor power pack (for electrical heating system) or to control the position of a modulating motor valve (for oil or gas fired heating systems). The analog outputs can be directly connected to Libratherm make single phase / three phase SCR phase angle fired power controller which is ideally suitable for both resistive and inductive heating load.

Open or Faulty sensor indications for each zone is also displayed with the respective Zone No. It also provides common High and Low alarm relay outputs, which can be used for external temperature dependent, inter locking or audiovisual alarm. The display scan rate is programmable from 1 to 99 seconds, whereas the internal control scanning is at the rate of 100ms. Separate displays are provided to indicate simultaneously the Process temperature, Set temperature and the channel / zone number. There is a provision to view on demand the on line status of the running program viz., Percentage control output, balance time of the current process, set point of current step, step no. in progress, etc. In case of power failure, the internal non volatile memory back up ensures automatic resumption of control from the last point on   power resumption.

PRC-8000 is ideally suited for on line pre and post welding heat treatment cycle. Where the large size jobs are heated by local heating pads. Temperatures are sensed using 6 to 8 Ktype thermocouples fitted at different points. The common program is run for all inputs and to ensure the uniform heating cycle, the PRC-8000 offers special feature of common or individual deviation hold facility, thereby the guaranteed ramp/soak controlled is achieved. Libratherm offers ready to use panel with input/output and supply connections.  

The serial interface of RS-485 in Modbus protocol is also available for operating the controller from remote computer, SCADA or DCS system and to monitor the process behavior in both graphical and tabular form along with the supporting. Windows based software.The model PRC-8000 is a field proven model in the Indian industry and performing since 1994 up to the users satisfaction.

Model PRC-8001 Single ZoneControl with 8 digital outputs is developed for sintering press to operatepressure valves at different temperatures.

TECHNICAL SPECIFICATIONS: