Micro processor based universal Timer / counter
Libratherm 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.

Features

Microprocessor 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
Application

Universal timer / co

Digital Timers / Counters / Stop watch/ RPM Meters
Libratherm 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.

Features

Quartz 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

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 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 .

Application

Speed indication

RPM indication

PH /ORP/Conductivity indication

Flow/Level indication and controlling

Pressure/Load measurement

AC / DC voltage & current measurement.

Valve position indication, etc.

Special models for typical application are available on request

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 Wise

C/O 5 A @ 230 VAC x 4 : RLY-4/1

C/O 5 A @ 230 VAC x 8 : RLY-8/1

C/O 6 A @ 230 VAC x 4 : RLY-4/2

C/O 6 A @ 230 VAC x 8(C/O = Changeover contacts) : RLY-8/2

DC to AC Solid State Relay Cards x 8
Model : SSR-8/AC

DC Input : (5 to 24) VDC

AC output : 110 VAC / 230 VAC Input / Output are optically isolated
DC to DC Solid State Relay Card
Model

DC Input : (3 to 30) VDC

DC Output : 12 VDC or 24 VDC

Max. current : 2 A @ 12 VDC / 1 A @ 24 VDC

Input / Output : Optically isolated

Output type : Open collector (NPN transistor)

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.

Application

Heat treatment

Furnace / Oven control

Power plant

Food processing

Environmental and Walkin chambers

Motor , transformer plants.etc.

Tunnel furnace

Laboratory equipment etc.

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.

Application

Carry 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 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.
Application

Protection of 3 phase loads like motors, pumps, transformers etc against failure and reversal of any one phase

Suitable to use on Electrical control panels