Libratherm Instruments Pvt. Ltd.
Libratherm Instruments Pvt. Ltd.
Dahisar East, Mumbai, Maharashtra
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Thyristor Power Controller

Our range of thyristor power controller is used for heating systems and DC rectifiers and ready to use control panels.

Hot Runner Temperature Control Systems

Hot Runner Temperature Control Systems
  • Hot Runner Temperature Control Systems
  • Hot Runner Temperature Control Systems
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Product Details:

TypeDigital
BrandLibratherm
Output4-20mA
Panel1 to 16

Libratherm offers 2 to 16 zone control panel for Hot Runner Temperature Control Systems,widely used in plastic injection moulding. The panels are designed taking into consideration all the required controlling and safety features to accurately maintain the desired temperature of all the zones.. The main components of the control panel are listed below.

1) PID temperature controller model PID-723 : This controller accepts the input from either K type or J type thermocouple or from RTD (Pt-100) sensor. The control output is in the form of DC pulse to drive external solid state relay or in the form of 4-20mA/0-5V signal to drive phase angle control SCR power regulator (model LTC-16). The built in Power limit and Ramp time features allows the gradual heating to evaporate the moisture content in the heaters. The ramp heating can be achieved by opting for the SCR control instead of SSR control. The controller has dual display, the upper display shows the heater temperature
and the lower display shows the heater current. The heater current in the form of 4-20mA signal is received from the separate heater monitoring card (HMC-8) as the second input. PID-723 has the built in logic to detect the heater break condition and to generate the HBA alarm. HBA relay output is also provided to activate audio/visual alarm. Depending upon the required number of heating zones, the number of PID controllers are used in the panel.

2) SCR based Heater power Regulator (LTC-16) : This power control module accepts the control signal of 4-20mA / 0-5V from the PID controller and in turn regulates the heater power very precisely. This module also has built settings for power limit, ramp up and ramp down for gradual increase and decrease of current flowing through the heater. The Phase angle control technique is used to fire the back to back connected SCRs – thereby giving smooth and uniform power control across the heater. The SCRs are rated suitably to control heater of up to 4 KW @ 230VAC. All the terminals for heater connections are brought out on the back panel terminals.

3) Heater Monitoring Card (HMC-8): This card is integrated and wired in the same control panel, which accepts the heater current through built in CT and converts the same to proportional (4-20)mA signal. This signal is connected to the PID controller as the second input to display the heater current and to generate the HBA condition.

4) Pulse Width Modulation Card (PWM-4) : This card is mainly used for the manual control of the heater power using front panel potentiometer. For the SCR based control panel, the heater power can be controlled manually in the MANUAL mode by feeding the analog signal to the SCR firing module. But for SSR based control panel – the manual operation is carried out using the PWM card. This card accepts the analog signal from the front panel potentiometer and generates the time proportional (variable duty cycle) pulse for the SSR. The percentage of power to be delivered can be set using the front panel potentiometer dial – marked as 0 to 100% power. Each such PWM-4 card can control 4 heaters in the manual mode.

5) Other Panel Accessories : Apart from the above important components, the panel is integrated with the banana terminals for thermocouples, Heavy duty mutli-pin Male/Female connector for the heaters, RYB phase indicating lamps, audio/visual alarm for HBA, Heavy duty plug / socket for the incoming mains supply, 2 pole MCBs in series with each heater and cooling fan to exhaust out the heat generated inside the panel. The panel is MS fabricated and duly powder coated for the lasting operation in the industrial environment.
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SCR Firing And Triggering Cards

SCR Firing And Triggering Cards
  • SCR Firing And Triggering Cards
  • SCR Firing And Triggering Cards
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Product Details:

ModelLTC-12, LTC-13, LTC-14 and LTC-15
EnclosureABS

Our product SCR Firing and Triggering Cards using Phase Angle Control Technique For Single / Two or Three Phase heater control and DC rectifier. Using synchronized phase angle control technique.

Specifications:

DesignDigital and Linear circuit based
Control TechniquePhase angle control – synchronized for each phase.
Input Control Signal(4-20)mA, or (0-5)V or (0-10)VDC or external 10Kohms potentiometer.
OutputsSuitable Gate Kathode triggering pulses to fire back-to-back connected SCRs. G1K1 + G2K2 using LTC-12, LTC-13 and LTC-14 (for Single and Two phase supply) G1K1 + G2K2 X 3 using LTC-15 (for Three phase supply)
Smooth ControlOn card setting to adjust Ramp Up and Ramp Down Time for soft increase and decrease of output voltage.
Current ControlUsing On card Current Limit and Trip settings – using presets. (LTC-13 and LTC-13/D).
Voltage SettingsFor adjusting max / min voltage per phase
Supply Voltage110/230/380/415 VAC, 50/60 Hz. Configuration dependent
Load ConfigurationSingle LTC-12 or LTC-13 card can be used for single phase or two phase load. Three nos. of LTC-12 or LTC-13 card can be used for three phase star or delta load Single LTC-15 card can be used for three phase star or delta load.
Sizes (Triggering Card) in mm.230 x 80 x 180 (LTC-12) 230 x 80 x 180 (LTC-13) 65 x 80 x 125 (LTC-14)--- DIN rail mount. 125 x 160 x 70 (LTC-15)
MountingAll these cards can be mounted inside the control panel.
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Heater Power Controller

Heater Power Controller
  • Heater Power Controller
  • Heater Power Controller
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Product Details:

BrandLibratherm
PhaseThree

Our range of single, two and three-phase Heater Power Controller are suitable for triggering pulses to fire back-to-back connected SCRs.

Specifications:

Available Ratings3KW Single Phase to 300KW Three phase
Available ConfigurationSingle phase, Two-phase, Three phase (3 or 4 wire star and 6 wire delta)
Control ActionPhase angle control (self-synchronized)
Control Signal(4-20)mA / (0-5)VDC / (0-10)VDC / Potentiometer (Control signal available from PID temperature controller.
OutputSuitable Triggering pulses to fire back-to-back connected SCRs.
Smooth ControlAdjustable Ramp Up and Ramp Down Time for the soft increase and decrease of the output voltage.
Current ControlUsing Current Limit and Trip settings on the card. (LTC-13)
SettingsFor adjusting voltage and current per phase
Load TypeSuitable for both resistive and inductive / transformer load (15A to 300A @ 110/230/415 VAC)
AvailabilityIn the form of 1, 2 & 3 phase triggering cards, complete Thyristor power pack or ready to use control panel with suitable PID or Program controller. Triggering cards are also suitable for 1 & 3 phase rectifiers.
DC rectifier applicationUsing LTC-15 card 6 SCRs can be controlled in full wave bridge configuration.
Supply Voltage230/380/415 VAC, 50/60 Hz.
Available ModelsSingle Phase power pack POW-1 Two Phase power pack POW-2 Three phase power pack in star with neutral 4 wire configuration – POW-3/S Three phase power pack in six wire open delta configuration – POW-3/D
Other accessories provided with each power packSemiconductor fuse per phase – to protect thyristors against short circuit condition. Thermal cut out switch on heat sink – to protect thyristors against overheating Cooling fan on heat sinks for thyristor above 50Ampere Heavy duty input/output terminals for supply and heater connections.
Size (Power Pack)As per Std.
MountingPower pack can be mounted on the base plate of the control panel
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Eco Version Temperature Humidity Transmitter

Eco Version Temperature Humidity Transmitter
  • Eco Version Temperature Humidity Transmitter
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Product Description:

Libratherm offers low-cost, rugged and reliable T RH sensor cum Transmitter (model HTX-220) for sensing T Rh in the environment and transmitting the analogue values (4-20)mA proportional to both Temperature and Humidity. Normally, the signal generated by T RH sensors are low in strength hence cannot be transmitted over very long distance and if done so the signal is likely to drop over very long cable which will result in the inaccurate measurement of temperature and %RH.

The transmitter featured here converts these low-level signals from Pt-100 and Rh sensor to equivalent 4-20mA, which can be transmitted over a very long distance without loss of accuracy in
the measurement. Dual 4-20mA proportional to T and %RH can be used for remote measurement and indication. These transmitter operates on the 24VDC power supply and housed in an ABS plastic enclosure with perforation for sensing. The 24VDC supply and 4-20mA are galvanically isolated from each other and hence prevents any ground line interferences/loading effect while connecting to any external measuring/controlling devices like DCS, PLC, BMS controller or PID controllers.

Model Wise Description:


TX-220Wall Mount Temperature Sensor and Transmitter76 x 70 x 38
HX-220Wall Mount Humidity Sensor and Transmitter76 x 70 x 38
HTX-220Wall Mount Temperature Humidity Sensors and Transmitter76 x 70 x 38


Specifications:

  • Enclosure: ABS
  • Output: 4-20 mA
  • Supply: 24VDC
  • Usage: Industrial
  • Brand Name: Libratherm Instruments

Applications:

  • HVAC / AHU
  • Humidifiers /Foggers and Dehumidifiers
  • Pharma Labs / Plants
  • Data Center / Server rooms
  • Green Houses, Ware Houses etc…
  • Textile Industries
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Additional Information:

  • Item Code: HTX-220
  • Pay Mode Terms: Other
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Kamlesh Panchal (CEO)
No. 401-403, Diamond Industrial Estate, Ketki Pada Road Dahisar East
Mumbai- 400068, Maharashtra, India


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