Libratherm Instruments Dahisar, Mumbai, Maharashtra

Libratherm Digital Voltage scanner model LVS-3, designed to monitor the incoming 3 phase AC supply voltage. It displays the AC voltage across 2 phases (like RY, YB & BR) sequentially at regular interval of time. LVS-3 also monitors one of the phase failures and phase reversal condition, under voltage and over voltage condition compared to the factory set values. The respective status is indicated on the front panel LEDs. In case of any of the abnormalities in the supply voltage a relay output is provided to indicate the false conditions. Under normal operation the relay will remain energized and under faulty condition the relay de-energizes. The relay contacts (rated for 5A @ 230VAC) can be used to trip the external load or contactor operating on 3-phase AC supply. LVS-3 is a useful instrument to protect the 3 phase loads like AC motors and it is widely used by the electrical panel builders. LVS-3 is rugged, reliable and field proven and is available in 14 DIN size of (96 x 96 x 120) mm. ApplicationProtection of 3 phase loads like motors, pumps, transformers etc… against failure and reversal of any one phaseSuitable to use on Electrical control panels

Libratherm offers SCR triggering cards model LTC-12 & LTC-13 designed to fire or trigger back to back connected SCRs using synchronized phase angle control technique. The card accepts analogue control signals like (0 – 5) VDC or (4 – 20) mA and provides proportional gatecathode pulses G1K1 + G2K2. These pulses can be used to trigger back-to-back connected SCRs of as high as 350Amperes. The card also provides built in regulated 5VDC supply to connect external potentiometer to manually control the SCR firing. LTC-12 and LTC-13 are same in all respect, except the card LTC-13 accepts the feed back signal from the external current transformer for the current limit and trip features. This feature is useful for transformers or inductive loads or heating loads like Silicone Carbide and Molybdenum which exhibits significant changes of resistance with increase in temperature. Both these cards can be used for heating control applications to control the AC power to the heating coils or to the transformers. Three such cards can be used for both 4 wire star and 6 wire delta configurations of the heating loads. LTC – 14 SCR triggering card is available in DIN rail compatible module and which can also be used to trigger triacs.Newly designed compact Three Phase SCR Triac triggering card model LTC-15 is used to fire three pairs of back to back connected SCRs or three numbers triacs configured as three phase - 4 wire star with neutral or 6 wire open delta. The entire assembly is available on either MS powder coated plate or on 6-mm. thick Bakelite sheet, which can be mounted inside the panel using 4 screws.Libratherm also offers ready to use Thyristor power pack modules ranging from 15 amps upto 350 amps for single phase, 2 phase and 3 phase heater load. The power pack module comprises the triggering card, suitably rated back to back connected SCR module - mounted on the appropriately rated air cool or forced cool heat sink, input and output clip-on type heavy duty connectors, etc. The entire assembly is mounted on either MS powder coated plate or on heavy duty Bakelite sheet, which can be easily mounted inside the panel as desired. Complete ready to use control panel with suitable temperature control panel can also be supplied as per the user’s specifications and requirement.ApplicationThe thyristor power pack has a varied application and can be used with heating elements like kanthal, super kanthal, silicon carbide, molybdenum infra red etc. Where precise and accurate power control is required. There is significant power savings with respect to conventional contractor type temperature control system which also depends on various other factors

Libratherm offers Miniature Head Mount Two wire Temperature Transmitter Model LTX-3000, which accepts RTD (Pt-100) or thermocouple as the input and provides output of (4-20) mA proportional to mV or resistance input. These transmitters are extensively used to minimize the effect of electrical noise and to eliminate the need of long runs of special compensating and three wire cables since ordinary pair of copper wires can easily be used without the drop or loss of input signal. Also, the current signal is less susceptible to industrial RFI/EMI noise compared to the voltage signal. These transmitters are linearized to the millivolt signal produced by a thermocouple or RTD sensors and not to the actual temperature.LTX-3000 require no separate power supply as it is powered by current drawn from the current loop itself and is thus intrinsically safe when used with appropriate barriers. It is very compact, economically priced and can be directly mounted inside standard heads of the thermocouple or RTD sensors. It can also be easily fitted inside the flame proof / weatherproof head or junction box. It is available for different thermocouples, RTD (Pt-100) duly calibrated for required temperature range with ZERO and SPAN adjustments for on site calibration. LTX-3000 is available in the standard size of 44 mm. OD and 26 mm. height (with the terminals). The Transmitter is also available in DIN Rail compatible modules.ApplicationCarry thermocouple or RTD signals over long distance using ordinary copper wires � without noise and loss of accuracy. Eliminates use of costly compensating cable.Can be directly interfaced with PLC, DCS, SCADA, PID, Program controllers etc�Transmitters are available with Thermocuple and Pt-100 sensors with Aluminium die cast head or Flame Proof Head.

Libratherm offers Digital Temperature Scanners model MSI-8 for 8 channel, MODEL MSI-16 for 16 channel, Model LSI-16 for 16 channel with higher accuracy, Model MSI � 8000 is Microprocessor based 16 channel and Model DATALOG � 16 is microprocessor based DATA LOGGER. All these models are suitable for continuous monitoring of temperature or process variables at different locations. These instruments eliminates the need of number of individual temperature or process indicators and hence saves on cost and panel space. Each model offers different features and can be used as per the requirement in terms of number of inputs, accuracy and price. Model MSI-8 accepts 8 thermocouples or RTD (Pt-100) sensors. The temperature is displayed along with the respective channel number. The scan rate is adjustable from 2 to 20 seconds. The standard features include SCAN/HOLD facility and manual increment of the channel number using ADVANCE front panel membrane switch. MSI-8, can also be used to monitor other process parameters. MSI-16 offeres similar features but for more than 8 channels with larger display and enclosure. The Linearized models LSI-16 series are made available to monitor upto 16 channels, with +/1 oC or +/-0.1 oC indicating accuracy and larger display size. The above models accepts 1 to 16 inputs but of single type only and having same measuring range. To suit applications where monitoring of different process parameters having different measuring ranges are required, the microprocessor based models are more suitable. Microprocessor based Sixteen Channel Temperature Scanner /Data Logger model MSI-8000/DATALOG-16 are suitable for continuous monitoring of temperature/process variables at 16 different locations with the indicating accuracy of 1oC or 0.1 oC and for other process inputs the instruments offers absolute indicating accuracy. Each input has independent amplifier and hence each input can be of different type. For example, out of 16 channels, 8 can be thermocouples, 4 can be RTD (Pt-100) and rest 4 can be (4-20)mA.Wherever, in addition to only monitoring the process parameters, the data logging, memory storage, common or individual high and low alarm relay outputs, printer or pc interface is also desired, the model DATALOG-16 offers them all as per the requirement. For this facility the built in real time clock allows real time data logging, parallel printer port allows on line and off line printing of the data and RS-232/RS-485 port allows data logging on to the PC. Necessary data logging software operating on Windows is also offered for both graphical and tabular representation of the data of all the channels which are logged in.ApplicationHeat treatmentFurnace / Oven controlPower plant Food processingEnvironmental and Walkin chambersMotor , transformer plants..etc.Tunnel furnaceLaboratory equipment etc.

Libratherm Instruments AC / DC Signal Convertor cum Isolator (Model : ISM-10) is designed in 35 mm. DIN Rail compatible modules. These modules accepts DC input signal of (4-20)mA, (0-20)mA, (0-50)mA, (1-5)V, (0-5)V or (0-10)V or from the Thermocouple or RTD Sensors or from the load cell, pH, ORP, conductivity sensors etc.. It also accepts AC variable voltage of (0-110 V)/(0- 230 V) or AC current of (0-5)A or (0-1) A from external CT and provides optically isolated output in the form of (4-20)mA or (0-5)V or (0-10)V. Both the input and output levels have their grounds optically / galvanically isolated. Thus the process signals received from the Transducers or transmitters or Sensors can be directly connected through ISM-10 to the PLC, DCS, SCADA etc.. without any ground line interference. The ZERO and SPAN presets are accessible to the user for on site calibration. These modules operates on 230 VAC / 110 VAC or 24VDC supply. The module with single input and multiple parallel outputs can also be provided to meet the control system requirement. These modules are rugged, reliable, field proven and economically priced.Applications :Interface low-level signals coming from the sensors or transducers from the plant to DCS, SCADA, PLC or PID process controllers without ground line interferences.

Libratherm offers four and eight channel Relay Cards. These cards are mainly designed for interfacing low level switching signal outputs coming from PLC, SCADA, DCS etc.. to the external AC/DC operated switching devices (like contactors, solenoid valves, lamps, motors etc..in industrial automation control application).Various types of such cards are available viz. Single changeover contact card, (1 C/O) two changeover contact card (2 c/o) operating on 12 or 24 VDC supply. Libratherm also offers AC and DC solid state relay cards (using Triacs and Bipolar Transistors) for 4 or 8 channel controls. AC solid state relay card accepts DC controls signal of (0-5) or (0-10) VDC and can switch any single phase AC load rated at 5A @ 230VAC . DC solid state relay cards also accept (0-5) or (0-10) VDC control signal and can switch the DC load of 5A @ 24VDC (max). The solid state relay cards are useful for fast switching (less than 1 second time) of AC or DC loads. The LED indication for each input control signal is also provided. Each output is All the relay cards can be mounted on the plane surface or can be mounted on universal DIN size rails.Electromechanical Relay Cards(for 4 channel and 8 channel)DC Input : (5 to 24)VDC Input Indication : By RED LEDs.Contact Outputs : Model WiseC/O � 5 A @ 230 VAC x 4 : RLY-4/1C/O � 5 A @ 230 VAC x 8 : RLY-8/1C/O � 6 A @ 230 VAC x 4 : RLY-4/2C/O � 6 A @ 230 VAC x 8(C/O = Changeover contacts) : RLY-8/2DC to AC Solid State Relay Cards x 8Model : SSR-8/ACDC Input : (5 to 24) VDCAC output : 110 VAC / 230 VAC Input / Output are optically isolated DC to DC Solid State Relay CardModelDC Input : (3 to 30) VDCDC Output : 12 VDC or 24 VDCMax. current : 2 A @ 12 VDC / 1 A @ 24 VDCInput / Output : Optically isolatedOutput type : Open collector (NPN transistor)

Libratherm offers PID Controller for ON LINE monitoring and controlling of pH or ORP or Conductivity value in the continuous process. The controller can be interfaced with the pH / ORP / Conductivity sensor to display the pH value in the range of 0.00 pH to 14.00 pH or ORP /Conductivity value in mV.Since the signal given by the pH electrode varies with the temperature, automatic temperature compensation (ATC) facility is in-built in the instrument to read pH value more accurately without manual adjustments. This feature is available in model PD-5000. The controller gives direct / reverse dc pulse PID output with settable dead band for the metering or dosing pump to control quantity of both acid and base levels in the chemical process, water purification or effluent treatment plants. The normal pulse rate is 100 pulses per minute. The dual direct / reverse 4 � 20 mA is also available for actuator accepting direct analog signals. The retransmission output of (4-20)mA proportional to pH/ORP level is also made available for the recording purpose. The controller is available in both standard and weather proof enclosure.For interfacing low level signals from ORP/pH/Conductivity sensors, Libratherm offers signal convertor/isolator module for generating proportional (4-20)mA signal for long distance transmission of the measured value.

Libratherm offers Microprocessor based Eight Zone RampSoak programmable PIDOn-off Temperature Controller (Model PRC-8000) where accurate temperature control of multiple zone rate of heating, cooling and soaking is required. PRC-8000 is as good as 8 individual rampsoak program controller in a single unit. Each zone can be independently programmed for 1 to 16 steps of RampSoak profile. Each loop parameters like PID, Hysteresis, Deviation hold and 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 ONOFF Control output in the form of DC Pulses or SSR or relay to drive external load contactor drivers for heating and cooling. It can simultaneously provide 8 analog PID control outputs in the form of (4-20mA) or (0-5) volt, which can be used 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 loads. 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 also a provision to view on demand the on line status of the running program viz., Percentage control output, remaining time of the current step, set point of current step, step no. in progress, etc. PRC-8000 can also be used as single set point ON OFF controller when the profile control is not desired.The deviation hold facility ensures uniform temperature of all 8 zones under control. Page 1 For graphical representation of the actual process in progress, duplex thermocouple can be used which can be connected to a chart recorder to track the behavior. PC based software for data logging to a PC is also available on request .PRC-8000 is available in standard 12 DIN (192 x 96 x 200mm) size for 8 zones, 6 zones or 4 zones. It operates on 230 VAC with built in high and low supply voltage trip circuits. It is also protected against industrial RFIEMI Interference. MODEL PRC 8001 Single Zone Control with 8 digital outputs is developed for sintering press to operate pressure valves at different temperatures. ApplicationMainly designed for pre and post welding stress relieving heat treatment cycles. Also suitable for multi-zone heating systems requiring rampsoak control.

Libratherm offers Microprocessor based Eight Zone PID Temperature Controller (Model PID-8000) (AS GOOD AS EIGHT PID CONTROLLERS IN A SINGLE UNIT) for processes requiring multiple zone heating or heating plus cooling control. It is most suitable for difficult processes which results in frequent system disturbances, and applications where accurate and simultaneous temperature control of number of heatingcooling zone is required. It also eliminates the need for number of individual PID or ONOFF Temperature Controllers thereby saves on cost and panel space. It can accept 8 Thermocouples or RTD (Pt-100) Inputs and can provide switching PID or ONOFF Control output in the form of DC Pulses or SSR Drivers for heating and cooling. It can also simultaneously provide 8 analog PID control Outputs in the form of (4-20mA) or (0-5) volt, which can be used to drive external SCR Heater Power Controller or other actuators. Open or Faulty sensor indications for each zone is also displayed with the respective Zone No. Each zone loop parameters like PID, SET, Hysterisis , Power Limit and Ramp Time values can be programmed from the user-friendly front panel membrane keyboard. The display scan rate is programmable from 1 to 99 seconds, whereas the internal control scanning is at the rate of 100mS. It also provides common High and Low alarm relay outputs which can be used for external temperature dependent inter locking or audiovisual alarm.PID-8000 is available in standard 12 DIN (192 x 96 x 200mm) for 8 zones, 6 zones or 4 zones. It operates on 230 VAC with built in high and low supply voltage trip circuits. It is also protected against industrial RFIEMI Interference. Libratherm also supplies complete Multizone Temperature Control Panel, which finds its applications in Plastic Extruders, Plastic Injection, Tunnel Furnaces, Ovens etc.ApplicationPlastic extrudersHeat treatmentRubber industryFurnace Oven controlFood processingEnvironmental chambersMulti zone furnaceMetal industryCold Storage and Chilling plantsLaboratory equipment etc.

Libratherm offers field proven models of microprocessor based multiple Ramp Soak programmable PID temperature controller PRC-300 & PRC 309 which are designed to improve reliability, accuracy and control in 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). One to ten different patterns each of sixteen rampsoak steps can be programmed into the memory with the user friendly membrane keyboard. Separate displays are provided to monitor simultaneously the Process temperature, Set temperature and the Program number. It can also be used as single set point control when the profile control is not desired. Inputs can be either Thermocouple, IR Thermocouple or RTD Temperature Sensors, or Voltage or Current Signals.It offers both switching outputs in the form of SSR or relay to drive external load contactor and continuous control outputs in the form of (4-20)mA or (0-20)mA or (0-5)volt or (0-10)volt which can be used 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. Additional 2 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 non volatile memory in the event of power failure. Two types of rampsoak programming facility is available, one by programming end set points and time between the two set points and other by directly programming the rate of heating or cooling i.t.o. oC per hour and soaking time. Libratherm offers ready use control panel of small to large size incoportaing above controllers with thyristor, ssr and other panel accessories.PRC- 2000 IS Upgraded version of PRC 300 for Temperature 0.1 to 2000.0 oC.Application Heat Treatment cycle control in metal industry.Investment casting in jewellery industry (for wax burn-out furnaces).Environmental test Chambers.Furnace Oven control.

Libratherm offers microprocessor based 4 set point on/off type controller (Model HTC-303). It is a single input, 4 set point controller. It accepts input from temperature sensors like thermocouple, RTD (Pt-100), Infrared thermocouple, or pyrometers generating Millivolt or milliampere signals or from the level/flow/pressure/pH transmitters in the form of (4-20)mA. The input signals from thermocouples and RTD(Pt-100) are software Linearized for 1oC/0.1oC indicating accuracy and other inputs are calibrated to the required scale. The controller provides outputs per set point in the form of 4 sets of potential free relay changeover contacts (5A/230VAC) or 4 sets of DC pulses to drive external solid state relays. (More number of set points can also be made available).The controller HTC-303 has 4 programmable set points and each can be configured for either High Alarm or Low Alarm or Deviation Alarm or for Off state with programmable ON/OFF hysterisis through user friendly membrane key board. This feature allows user to use this controller for the varied application � where event or control outputs are required to energize or de-energize various contactors or solenoid valves. Dual 4 digit Red / Green display allows simultaneous indications of the process value and the set value with LED indications on the front showing the ON/OFF status of the outputs.It can also be used for other process control applications like pressure control, level control, flow control etc. accepting input signals from the respective transmitter or transducers.The controller HTC-303 works on 230VAC or 110VAC and is protected against industrial RFI/EMI interference by a suitable filter and surge suppresser. It requires a standard ¼ DIN panel cut out of 92 x 92 mm.ApplicationTemperature controlPressure controlLevel controlProcess industryPlastic / Packaging industry

Libratherm offers two field proven models of Auto tune PID controllers. One is a microprocessor based PID-300 and other is microcontroller based model PID-723. PID controllers are superior compared to simple digital onoff and time proportional controls. They are widely used for applications requiring precise and very accurate temperature control of a heating or cooling systems which undergoes frequent disturbances.For temperature sensing, PID-300 accepts either thermocouple, RTD temperature sensors, or voltage or current signals. While PID-723 has facility to accept fixed or universal input, where type of input can be selected by the user depending upon requirement. In all 8 inputs are user selectable like 5 types of thermocouples J,K,R,S, B and RTD(Pt-100), (0-5)V and (4-20)mA. This facility allows user to use the same controller for varied temperature control applications, by merely changing the sensor type.For controlling purpose, both the models provides switching control outputs of relay contacts, or solid state relay driver or Triacs – (for controlling switching devices such as contactors, solenoid valves or solid state relays), as well as analog control outputs of (4-20) mA or (0-5) V which can be used to control a Thyristorized power pack (for electrical heating system) or to control the position of a modulating motor valve ( for oil or gas fired heating system). Dual PID outputs for both direct and reverse actions are also available for applications requiring heating and cooling control. Both the models can also be used for any other process control applications such as - flow control, pressure control, level control, humidity control, pHORPConductivity control etc… by accepting inputs from respective process transmitters or transducers. Libratherm also offers ready to use instrumentation control panel incorporating PID controller with other required panel accessories.ApplicationConstant temperature bath.Plastic Injection Extruders.Furnace Oven control (Electrical Fuel fired). Environmental chambers BOD incubator.Plastic Packaging Rubber and metal industry.Cold Storage and Chilling plants.R & D centers and Test Laboratory.

Libratherm offers Linearized Temperature IndicatorController for very accurate indication and control of temperature within the accuracy of ± 1oC or ± 0.1oC using software linearization technique. The non linear curve of the temperature sensor is linearized by computer generated software and are stored in the high density EPROM. All versions of controls like ONOFF, Time Proportional or Proportional action are available.ApplicationHeat treatment Furnace Oven control Star Delta change over of heating coils Police protection with PIDProgram controller Constant temp. bath Environmental chambers Research & Dev. Centers for CRYOGENIC applications. Cold storage and Chilling plants Laboratory equipment …..etc.

Libratherm offers various models of Digital and Microprocessor based Temperature and Humidity Indicator / controller. The model HTC-3000 and HTC-3003 are specially designed for Environmental test chambers, however, they can be used for any HVAC applications, where simultaneous and accurate control of desired temperature and humidity is required.The controller accepts input signal from direct RH sensor for humidity control and / or RTD (Pt-100) sensor for temperature control. The controller gives three dc pulse outputs for controlling Air heater for dry heat, Boiler heater for humidity and Compressor for low temperature control. The 4th output is also optionally available for dehumidification. The control action is PID or On/Off for heaters and On/Off with built in programmable time delay for compressor. The compressor can be operated in Auto, On or Off mode as per control temperature requirement - above ambient, below ambient or below zero. Each channel loop parameters like PID, Set and hysterisis can be programmed from the front keyboard. The additional facility of built in real time clock, RS-485 or RS-232 PC interface, data storage and printer output for 80-column dot matrix printer (CENTRONIX output - suitable for EPSON model LX-300+ or equivalent ) is also provided for analysis of temperature and humidity behaviour date and time wise.The Controller has the built in non-volatile memory for the retention of the programmed values in case of power failure and on resumption of power the control will resume from the last value. To suit the control system, the special interlocking of the compressors and heaters are incorporated to enhance the performance and safety of the entire control system, which is achieved by switching off the compressor, if the air heater temperature exceeds certain preset value.The model DTH-100 is a digital temperature/humidity indicator. The single and two set point on/off control outputs in the form of relay contacts are also available for simple control applications.

Micro processor based universal Timer / counterLibratherm offers model UTC-400 a general purpose microprocessor based real time digital universal timer / counter for industrial use. This Real Time Based timer / counter is designed to serve the special purpose application which ordinary timer or counter can not easily meet. Multiple timer and counting facility allows single unit to perform multiple functions. For timer functions - the On delay/OFF delay /Cyclic modes are user programmable with maximum 4 event outputs in the form of relay contacts. The real time clock is also available for the real time dependent event outputs. Any complex time based applications can be programmed through front panel key board.For counter functions �the unit accepts inputs from the proximity sensor, photo sensor or a mechanical contact. Up or down counting with programmable multiple set point makes unit versatile for any counting applications.The counter / timer has 8 digit display to indicate time or count values with 4 keys for programming various functions.The Timer operates on 230V / 110 VAC, 50 / 60 Hz and is protected against industrial RFI/EMI interference by a suitable filter. It requires a standard DIN panel cut out of 92 x 92 mm.FeaturesMicroprocessor based Max. 4 event outputs are available Time base : 0.01 to 1 hour for timer Mode : UP / Down selectable for counter Accepts input from proximity switch / photo sensor / encoder / pulse � etc. Last event stored in the memory in case of power failure Auto start on resumption of power Visual indication of event provided Available in 96 x 96 x 160 metal enclosure ApplicationUniversal timer / coDigital Timers / Counters / Stop watch/ RPM MetersLibratherm offers simple Digital timers/counters for general purpose industrial use. The timers are accurate, rugged, reliable and field proven and based on solid state electronic design. The accurate time base ranging from 0.01 second to 1 hour is derived from high frequency quartz crystal oscillator. The delayed ON, delayed OFF and Cyclic mode of operations are available with the output of single or dual relay change over contacts rated for 5A @ 230VAC. The desired time can be preset using the front panel push button coded wheels. The elapsed or remaining time is displayed on 2 to 4 digit bright red or green LED display.The timers with stop watch function having front panel RESET and START/STOP switch is also available with and without PRESET facility. Battery back up features are also optionally available. The timer operates on 230 VAC or 110VAC or 24VDC supply. They are available in various sizes of 96 x 96 x 120, 96 x 48 x 130 , 48 x 96 x 130 or 72 x 72 x 110 mm.The counters are designed to accepts proximity sensor or photo sensor or mechanical contact to count objects or events. The desired count value can be set using the push button coded wheels and the relay output is available when the count value equals the set value. The RPM meter also accepts proximity sensor or photo sensor and accurately measures RPM in the range of 6 to 10000 RPM of any rotating objects.FeaturesQuartz Crystal Time Base 0.01, 0.1, 1 sec/min/hour On Delay, Off Delay and Cyclic mode of operation Proximity, Limit switch, Photo sensor etc. inputs for counter ¼ DIN and 1/8 DIN Sizes � sturdy metal enclosures Remote and front panel start/stop Operates on 230VAC/110VA Applications :The timers/ counters have wide industrial applications, where time and count (numerical value) dependent event control is required. For example to start and stop the machine or to activate the solenoid valve on reaching the count value etc.

Libratherm�s new MODEL ¼ DIN & 1/8 DIN series of Digital Temperature Indicator / Controllers available in metal enclosures are accurate, rugged and reliable instruments designed for critical and precise general purpose temperature indication and control applications. The range offers 0.5� & 0.3�, 7 segment high intensity digital display with single / two set point adjustment using 10 turn potentiometers or using 3 / 4 digit thumb wheels switches.MODELS WITH 1� DISPLAYS are also available in 192 x 96 size enclosure.Model - MTI � X, is Multi point indicator, for measuring temperature at various points using single instrument. Two to 12 points can be selected using rotary selector switch.�ApplicationHeat treatment Furnace / Oven control Food processing Constant temp. bath Environmental chambers Plastic / Packaging industry Cold Storage and Chilling plants Laboratory equipment �..etc.

Libratherm�s new ECO - MODEL series 480, 720 & 960 of Digital Temperature Indicator / Controllers available in ABS enclosure are low cost, accurate, rugged and reliable instruments suitable for general purpose temperature measuring and controlling applications. It accepts thermocouple or RTD as the sensing input and provides Relay / Solid State Relay control output for controlling the electrical or fuel fired heating or cooling system. The range covers simple Temperature Indicator, Single and dual set point ON/OFF or Time proportional Controllers. ApplicationFurnace / Oven / Refrigeration control Heat treatment Environmental chambers Plastic / Packaging industry Cold Storage and Chilling plants Laboratory equipment ..etc. Special model available for Infra red heaters.Optionally AvailableModel with dual input and dual set point Model with dual display to indicate PV & SVSimultaneously with single and dual set point control

Description : Libratherm offers simple Digital Process Indicator Controller, which are low cost, accurate, rugged and reliable instruments available for indication and single and dual set point On/Off control for general-purpose process control applications. Indicators are available in display sizes of 0.5” to 4” for panel mounting and shop floor installations.Models featured here can be used to monitor and control the various industrial process parameters such as AC/DC voltage and current, Pressure, Load, pH, ORP, Conductivity, RPM, Flow, Level, Humidity etc. Single and Two set points with relay outputs are provided for control or alarms.All instruments accepting 4-20mA are also provided with built in 12 to 24VDC loop supply.Some of the above models are also available in suitable size Weather proof and flameproof /Explosion proof enclosures for use in the hazardous environment. Features :• Elegant appearance and compact in size.• Accurate and sturdy in operation.• Accuracy better than ± 0.5 % of the full scale.• Very easy to operate. Application :Monitoring of Process parameters with digital display • Pressure, Weight, Flow, Level control• pH, Conductivity, ORP Control• AC/DC voltage and current control• Measurement of RPM, LPM, BPM etc…

Size : As given in the above table - 72 x72, 96 x 48, 96 x 96, 192 x 96 mm

Libratherm offers various models and sizes of Digital and Microprocessor based industrial process indicator / Controller for indication and controlling of AC/DC voltage & current, pH, ORP, level, Pressure, conductivity, speed, RPM, Load, etc�These instruments standard features includes single / dual display for indication of process and set value. It accepts input from sensors / transducers generating millivolt or milliampere signals or from the level / flow / pressure / pH / transmitters in the form of DC voltage or current signal.These indicators are available in various sizes and models with single to 4 set points, 24VDC loop supply, (4 � 20) mA re-transmission output, potential free relay out put, etc. Models with both green and red displays 7 segment LED are available . ApplicationSpeed indicationRPM indicationPH /ORP/Conductivity indication Flow/Level indication and controllingPressure/Load measurementAC / DC voltage & current measurement.Valve position indication, etc.Special models for typical application are available on request

Libratherm offers hand held easy to operate Digital Portable Thermometer Temperature Indicator (Model DTM-21) mainly for industrial use. It can measure the temperature from -100oC to +1000 oC within ± 0.5% accuracy of the specified range.Applications :To measure the temperature of hot or cold flatrotatingvibrating surfaces, solid surface, vibrating surface, cylindrical surface, powder, liquid, gas, furnaces, ovens, cold storage's, hot mould, etc.

Digital Linearized Temperature Indicator / Controller Product Specification : Model wise descriptions : Model Product Description Size (mm.) DLI-12 Temperature Indicator 0.5" Display 96 x 96 x 160 DLI-1000 Temperature Indicator 1" Display 192 x 96 x 160 DLI-2000 Temperature Indicator 2" Display 192 x 96 x 160 DLI-4000 Temperature Indicator 4" Display (wall mounting) 500 x 250 x 150 MLI-X Multi-point Temperature Indicator (X=2,4,6,8,10) (Using rotary selector switch) 96 x 96 x 160 MLI-2 2 point indicator   MLI-4 4 point indicator   MLI-6 6 point indicator   MLI-8 8 point indicator   DLC-301 Single Set Point Temp. Controller (4 digit T/W setting) 96 x 96 x 160 DSL-12 Two Set Point Controller ( 4 digit T/W setting for each set point) 96 x 96 x 160   Description : Thermocouple sensors generating emf/mV and RTD sensors generating the change in resistance value with respect to the change in temperature does not have non linear characteristic, hence to indicate the temperature within the accuracy of 0.1 oC or 1 oC throughout the measurable range, the need arises to linearize these non linear curves. Libratherm offers various models of Linearized Temperature Indicator / Controller for accurate indication of temperature within the accuracy of ± 1oC or ± 0.1oC in spite of non-linear behavior of the thermocouple and RTD (Pt-100) sensors. The Linearized indication is achieved by software linearization technique using 12 bit ADC and high-density memory, where the data’s are stored in. Along with the digital Linearized indications, single or dual set point control is also available. The Control action may be ON/OFF (through Relay/SSR/Triac). One of the application areas of this controller is to use it as the safety controller (or police protection) along with the microprocessor based PID or RAMP/SOAK program controller, where the indicating accuracies of both are matched without any ambiguity. Features :• Accuracy better than ± 0.1 % of the full scale.• Elegant looks and Very easy to operate.• Digital design and not prone to EMI/RFI.   Application :• Heat treatment• High temperature Furnace / Kiln control• Star / Delta change over of heating coils• Police protection with PID/Program controller• Metallurgy and Ceramic R & D centres.  

Libratherm offers variable speed DC drive, which is rugged, compact and fully solid-state controller designed to drive either permanent magnet DC motors or excited field DC motors with the facility to vary the speed through a single turn potentiometer or through the external analog control signal of 0 � 5VDC, 0 � 10 VDC or 4 � 20 mA. Two different models are available, one is TDM-1000, which is a modular design with optically isolated control input and other is TDM-10 which is ¼ DIN panel mounting type with speed control using front panel potentiometer. The control signal and the potentiometer are optically isolated from the armature and field voltage. This feature is useful to directly control the motor speed through PLC, PID or similar other process controllers in a closed loop control system without the need of external signal isolator.The drive is designed using the solid � state components and is available in the modular form to suit OEM�s applications. The drive is also available in the stand alone control panel along with accessories like RPM / voltmeter, current meter, Start / stop and forward / reverse logic, indicating lamps, speed potentiometer etc.The drive operates on 230 VAC. The speed regulation is achieved by armature voltage feed back or by the tachometer feed back. Several other controls and stanadard protection features are soft start, maximum speed set, minimum speed set, filed failure, overload protection, remote on / off etc.Applications :Suitable for small machines in Plastic, Packaging and Pharmaceutical industries.Areas where smooth steady and fine DC motor speed control is required.

Libratherm offers 4 and ½ digit mV Calibrator, which is suitable for simulation and measurement of thermocouple signals. It can be used to calibrate or cross check the calibration of temperature instruments. Some model also soureces (4-20)mA current for calibrating temperature and other process transmitters. Even transmitter output can also be measured accurately using the built in loop supply of 24VDC. For calibrating RTD based instruments a separate fixed and variable value resistance source is available.Applications :Measures temperatures in conjunction with a thermocouple.Calibration and testing of indicators and recorders Suitable for many routine field servicing and in house test/measuring unit to calibrate temperature indicator / controller.Mini Volt Calibrator MODEL : LC-02 RANGE : 0.00 � 199.99 mV. & 0 � 1999 mV ±1%FSD.POWER SUPPLY : Mains 240 VAC or 110 VAC Operated only MODES : Sink & Source OUTPUT : ADJ. Using Coarse and Fine PotentiometerRANGE SELECTION : Using Push SwitchWEIGHT : 2.0 kg ApproxResistor Calibrator for RTD Source onlyMODEL LC - 02OUTPUT ADJ. : 12 Fixed Points { -50, -10, 0, 10, 50, 100, 150, 200, 250, 300 & 350 OHMS} and Variable between each Ranges using PotentiometerACCURACY : ± 0.1% SIZE : 96 X 96 X 120