Libratherm Instruments Pvt. Ltd.Libratherm Instruments Pvt. Ltd.

Digital and Microcontroller based Temperature / Process Indicator and Controller

Simple Digital Temperature / Process Indicator and ControllerDigital Linearized Temperature Indicator and ControllerMicro-Controller Based 2 to 4 Set points Temperature / Process ControllerDigital Portable Thermometer

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Single and Multi loop PID Temperature / Process Controller

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Single Zone and 2 to 8 Zone Ramp/Soak Programmable PID Temperature Controller

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Temperature / Process Scanner, Data Loggers and Data Acquisition Software

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Humidity and Temperature Indicator, Controller, Transmitter and Logger

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Signal Isolators / Converter, Two Wire Temperature Transmitters

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Thyristor Power Controller

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Molten Metal Temperature Indicator

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Digital and Microcontroller based Temperature / Process Indicator and Controller
Our range of digital process controller and micro controller based temperature and digital process indicator, controller are used in different industries. Some of these products includes -
Simple Digital Temperature / Process Indicator and Controller


Simple Digital Temperature / Process Indicator and Controller

Simple digital temperature and process indicator comes with ABS plastic with polycarbonate graphics are used.
Design Digital and Analog circuit based
Temperature Sensor Input Thermocouple type J, K, or RTD (Pt-100)/2 or 3 wire (any one to be specified)
Temperature Range 0 to 400oC for J,K or (Pt-100) 0 to 1000oC for K type 0.0 to 199.9oC /-100.0 to 199.9oC for (Pt-100) (User to specify required range)
Process Input (4-20)mA, (0-1)V, (0-5)V, (0-10)V
Process Range 0 to 1999 or -1999 to +1999 or 0 to 19999 or -19999 to +199999 with choice of Decimal point (User to specify required range)
Indicating Accuracy +/-0.5% of the specified range for temperature input and Absolute to the process input
Display Size 3 and ½ digit or 4 digit or 4 and ½ digit 0.3”, 0.5”, 1.0”, 2.0” and 4.0” red/green seven segment LED.
Control Set Points One or Two settable using potentiometer or thumb wheel switches.
Control Action On/Off, Time Proportional or Analogue Proportional
Hysterisis, Band and Reset Control Adjustable using front panel potentiometers (settings are model dependent).
Control Output a) Relay changeover contacts(6A@230VAC) – preferred for ON/OFF control only (To drive external power contactors)
b) Solid state relay driver (0 to 10) VDC pulse – preferred for Time Proportional control.
c) Built in Solid-state relay or Triac (rated for 10A @ 230VAC) – preferred for Time Proportional control. d) Analog or triggering pulses for Triac for phase angle control {single phase} – preferred for proportional control.
Supply Voltage 90 to 250VAC, or 110VAC / 230VAC +/- 10% 50/60 Hz.
Enclosure ABS Plastic for 1/8 din, ¼ din and Metal for others
Front Fascia ABS plastic with polycarbonate graphics
Sizes in mm. 96 x 48, 48 x 96, 72 x 72, 96 x 96, 192 x 96 (for 0.3” to 2” display size). Bigger size for 4” display size.
APPLICATIONS: • Furnace / Oven control • Constant temp. Baths • Plastic / Packaging / Pharma industry • Cold Storage and Chilling plants • Laboratory equipment etc.
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Digital Linearized Temperature Indicator and Controller
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Digital Linearized Temperature Indicator and Controller

Our range of digital linearized temperature indicator and controller are used for police protection with PID/Program controller
Design Digital and Linear circuit based with EPROM for look up table.
Temperature Sensor Input Thermocouple B, C, D, E, J, K, R, S, T, or RTD (Pt – 100) {Any one to be specified}
Temperature Range Full Range of the specified input sensor. J = 0 to 760°C, K =0 to 1372°C, R,S = 0 to 1768°C, B = 0 to 1820°C, C,D = 0 to 2000°C, Pt-100 = -200.0 to +200.0°C or 0.0 to 400.0°C.
Indicating Accuracy Better than +/-0.1% of the specified range for temperature input. Linearized for +/- 1°C or +/- 0.1°C.
Display Size 4 digit 0.5”, 2.0” and 4.0” red/green seven segment LED.
Control Set Points One or Two settable using thumbwheel switches.
Control Action On/Off with fixed hysteresis of +/- 1°C or +/- 0.1°C.
Control Output a) Relay changeover contacts(6A@230VAC) or / and
b) Solid state relay driver (0 to 10) VDC pulse
c) Built in Solid-state relay or Triac (rated for 10A @ 230VAC).
Supply Voltage 110VAC / 230VAC +/- 10% 50/60 Hz.
Enclosure Metallic with ABS Bezel and Polycarbonate front fascia, weather proof / Flameproof enclosures are also available.
Front Fascia ABS plastic with polycarbonate graphics
Sizes in mm. 96 x 96 x 160 mm., 192 x 96 x 160 mm
APPLICATIONS: • Heat treatment • Furnace / Oven control • Star / Delta changeover of heater loads • Police protection with PID/Program controller • Research & Development Centers • Physics, Ceramic and Metallurgy Dept. • Cold storage and Chilling plants
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Micro-Controller Based 2 to 4 Set points Temperature / Process Controller

Micro-Controller Based 2 to 4 Set points Temperature / Process Controller

Our range of micro controller are based on 2 to 4 set points temperature and process controller
Design High speed 8 bit micro controller based with 12bit ADC/DAC
Temperature Sensor Input / Process Input Thermocouple type J, K, R, S, B, C, D or RTD(Pt-100) 2 or 3-wire input. DC voltage, (4 – 20)mA (Fixed / Universal in nature and it is user selectable using key board in combination with DIP switch.
Temperature Range / Process Range Full range of the specified input type. For process input the range is programmable from 0 to 3500 count or -2000 to +2000 counts with the facility to select decimal point at 0.000, 00.00, 000.0 locations.
Resolution 0.1/1°C/unit for Temperature Subject to the specified input and range
Accuracy Better than ± 0.1% of the specified range
Display 4 digit 0.5”/0.3” Red 7-segment LED display for process value 4 digit 0.5”/0.3” Red /Green 7-segment LED display for set value
Control Action ON / OFF with programmable Hysterisis.
No. Of Set points 1 to 4 (HTC-723, HTC-948, HTC-489) 1 to 6 set points (HTC-966)
Control outputs Built in 2 relays for 2 set point control, otherwise for 3 to 6 outputs DC pulses to drive external SSR or external relay card.
Output Configuration Each output is configurable through key board for High Alarm, Low Alarm, Deviation Alarm or for OFF state – with programmable hysteresis.
Output indication Front panel LED indication (OUT1 to OUT 8 – Model dependent)
Retransmission Signal (Optional facility) 2 independent 4-20mA signal proportional and linearized to input – 12 bit resolution (HTC-723 and HTC-966). One for PV and Other for SV.
Loop Supply (internal) 18 - 24VDC for external Two / Three wire Transmitter (optional)
Supply 90 to 250 VAC ± 10% (5VA), 50/60Hz.
Enclosure ABS Plastic
Front Fascia ABS plastic with polycarbonate graphics
Sizes in mm. 96 x 48, 48 x 96, 72 x 72, 96 x 96.
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Digital Portable Thermometer


Digital Portable Thermometer

The digital portable thermometer that we have is single 9 volts dry cell, with very low consumption.
Probes ‘K’ type Thermocouple probe or RTD(PT-100) probe. Available in various shapes and sizes to meet all types of measurement.
Range 0 to1000°C using ‘K’ type probe 0 to 400°C or -100.0 to 200°C using(Pt-100) probe.
Accuracy ± 0.5 % in the range of (0-400)°C. ± 1.0% in the range (0-1000)°C.
Resolution 1°C or 0.1°C up to 199.9°C for RTD sensor only.
Display 3 & ½ Digit, 0.5" height LCD.
Polarity indication Provided.
Over range indication Provided.
CJC Built in and Automatic.
Supply Single 9 volts dry cell. (Very low consumption)
Low battery indication Provided.
Operating Ambient (0-50)°C
Dimensions 145 x 29 x 80 mm
Weight 200 gms (approx).
APPLICATIONS: • Designed for Industrial Use • Hot or Cold surface temperature • Liquid, Powder, Grain temperature • Gas or Air temperature • Rotating or Vibrating surface temperature • Cylindrical Surface temperature
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Contact us
Mr. Kamlesh Panchal
No. 401/402, Diamond Industrial Estate, Ketki Pada Road,, Dahisar East
Mumbai, Maharashtra - 400 068, India
Telephone:  +(91)-(22)-28964769/ 28963823

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