Libratherm Instruments Private Limited

Model Wise Descriptions
Model Product Description
SIZE (H x W x D) mmSSR-3-ZC-2L-25
SSR-3S-ZC-3L-25Three Phase Thyristor based 2 leg or 3 leg solid state relay module - suitable for 3 phase heaters connected in 3 wire Star or Delta configuration (3 to 15KW @ 415/440VAC) - Natural Air Cooled.165 x 170 x 145SSR-3-ZC-2L-50
SSR-3S-ZC-3L-50Three Phase Thyristor based 2 leg or 3 leg solid state relay module - suitable for 3 phase heaters connected in 3 wire Star or Delta configuration (16 to 30KW @ 415/440VAC) - Natural Air Cooled.165 x 170 x 145SSR-3-ZC-2L-100
SSR-3S-ZC-3L-100Three Phase Thyristor based 2 leg or 3 leg solid state relay module - suitable for 3 phase heaters connected in 3 wire Star or Delta configuration (31 to 60KW @ 415/440VAC) - Force Air Cooled (through FAN).230 x 190 x 170
Features
Uses High PIV Semikron make SCR modules (SKKT series)
3 phase load / 2 leg star/delta or 3 leg star control.
Accepts DC pulse (12-24) VDC as the control signal from external controller.
Simple and Modular design for easy servicing of cards and thyristors.
Suitable for resistive heating loads.
Finds application in 3 phase Air heaters in Ovens/Furnace/AHU / DHU/ HVAC etc
Compatible with DDC/PID/PLC of any brand.
Description of Thyristor based 3 phase Solid State Relay (SSR)
Libratherm offers ready to use 3 phase Zero Cross over thyristor based solid state relay module model SSR-3-ZC-2L and SSR-3S-ZC-3L for electrical heating loads ranging from 3KW to 60KW @ 415/440VAC. This SSR module comprises of Libratherm make triggering card, which generates the zero cross over firing pulses to control suitably rated back to back connected SCRs, which is duly mounted on the heat sink with input terminal for control signal and heavy duty bus bars for heaters and incomer AC power supply. The entire assembly is mounted in MS powder coated enclosure, which in turn can be easily mounted inside the closed control panel as desired.
Complete ready to use control panel with suitable PID / Program temperature controller can also be supplied as per the user''s specifications and requirement.

Our range of microprocessor-based Humidity & Temperature Controller (for Stability chambers) is best used for stability chambers. It has manual tuning of PID values.

HTC-3003: Microcontroller based Temperature & %RH PID-On/Off controller (2 AI + 2 DI and 4 DO) with RTC, Printer port, RS-485 Serial port and Extra 256KB memory bank.

• Microcontroller based design.
• Easy front panel keyboard programmable.
• Independent 4 control outputs for Temperature/%RH control (4 x DO).
• Digital input for water level, door switch, etc (2 x DI).
• User programmable alarm limits with auto snooze facility.
• PID or ON/OFF control action for Air heater, Boiler heater and ON/OFF control action for Compressor with programmable time delay.
• Direct dot matrix serial output for EPSON printer model LX-300+ or Equivalent.
• RS-485 port for computer interface.
• User friendly and expandable Window based PC software.