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For more than 31⁄2 decades Diligent Micro Controls is in the field of developing and manufacturing custom-built electronic systems for industrial applications. Starting point for the development could be layman’s statement of prob ...Read More

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Diligent Micro Controls

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In continuous control of combustion process, it is required to adjust fuel and air in right proportioncontinuously according to the variation in the signal from pressure / temperature controller. However,relationship between fuel valve actuator and damper opening does not remain linear due to complex nature ofcombustion process. Hence, control signal received from controller has to be modified for optimum results ofcombustion. For this purpose, complete range is split in number of steps and each step can be multiplied byfactor which is expected to give optimum combustion results. Multiplying factor can be set at any valuebetween 0.5 – 1.5 independently for each step. Output signal is clamped to either minimum or maximumvalues whenever it tries to go beyond these values in any step. Diligent RATIOCON 4-20I 16 is one suchcontroller designed by M/s Diligent Micro Controls to accept 4 – 20 mA dc signal from either pressure /temperature controller and provide modified signal which is also lying in 4 – 20 mA range.This controller is housed in standard 96 x 96 mm plastic enclosure and it works on 230 V +/-10%, 50 hz, 1 phac supply.1. Description:‘Diligent Ratiocon 4-20 I 16’ accepts 4-20 mA signal at the input terminals on the rear panel of thebox. This range is split in 16 steps and 16 presets are provided to modify each step independentlywith multiplier between 0.5 to1.5. 16 LEDs are also provided and LED lights when the input signalcrosses the step value. Modified output of 4-20 mA, is provided at the out put terminals on the rearpanel of the box. When ever out put tries either to go below 4 mA or to go above 20 mA as a result ofmultiplying factor setting, internal circuit clamps output to 4 mA in the first case and 20 mA in thesecond case. Clamped status of <4 mA and > 20 mA is indicated by respective LED on the frontpanel. Rear panel has two terminals which have to be shorted together during Calibration Mode.Power supply Phase, Neutral & Earth are connected at the respective terminals on the rear panel. Thiscould either be 230 V or 110 V +/-10%, 50 hz, 1 phase AC. RATIOCON has 3 digit display whichnormally indicates the out put current signal and when the switch on left top corner is pressed itindicates the input current; either actual or calibration.2. Operation:Diligent RATIOCON becomes operational as soon as the a.c. power supply is connected to it.RATIOCON has two modes of operation; namely Calibration Mode and Normal Mode.MICRO CONTROLSRATIOCON operates in Calibration mode when corresponding terminals on the rear panel are loopedtogether. In this mode internal variable current source is connected to the input stage of RATIOCONand its out put can be varied by the knob located on right top corner. The value of this current can beread on the digital display by pressing the push button. Calibration procedure is as follows –a. Turn Calibration Adjustment knob fully anticlockwise till the current value drops below 4 mA.‘<4 MA’ LED will light as soon as out put current drops below 4 mA and out put current will beclamped to 4 mA.b. Turn the Cal. Adj. slowly in clockwise direction till the first step LED (marked ‘4’ on the panel)lights.c. Adjust preset below this LED to read the desired out put value on the digital display.d. Repeat ‘b’ & ‘c’ above for all the remaining steps.e. Continue to increase the calibration current beyond 20 mA. ‘>20 mA’ LED will light as soon asthe out put current tries to go beyond 20 mA. Out put current will be clamped beyond this at 20mA.f. This completes the calibration and the loop wired between two terminals on the rear panel cannow be removed.RATIOCON enters NORMAL Mode as soon as the loop wired for calibration, is removed. In thiscase input stage of RATIOCON now receives input signal directly and will generate out put signalaccording to the preset program.3. The connections details are given on the rear panel and are self explanatory.4. This instrument is not site maintainable.5. Diligent RATIOCON carries warranty for twelve months from the date of its delivery from ourworks. During this period, we undertake to repair/replace free of cost our defective unit in part or fullat our total discretion provided that such unit is brought to our works for rectification and collectedthere from after satisfactory inspection by the customer at his cost & risk and provided that the defectis due to poor material and/or workmanship and not due to misuse and/or mishandling. This warrantyis exclusively limited to the unit supplied by us and we shall not be responsible in any ways for any ofthe consequences of its use and/or misuse any where. This warranty shall automatically become null& void if our unit is opened/tampered by person not authorised by us.6. Specifications:Power Supply 230V or 110 V, 50 hz, 1 ph AC supplyInput Signal 4 – 20 mA dc.Input burden 100 ohms.Output Signal 4 – 20 mA dc.Output burden 400 ohms.Calibration current source InternalDigital Display 3 digitsOutput under / over range Output clamped to respective limits. ( Minimum at 4 mA& Maximum at 20 mA). Status LEDs providedModes of Operation Calibration and NormalSize Standard size 96 mm x 96 mm x 150 mm

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Automatic Oil Burner Controller. We offer autocon for oil burner control which is fabricated by using high grade components which in turn are sourced from a network of trusted vendors from across the nation. Some of the features of this Autocon are as follows:Automatic on/offMultistage or modulating controlAutocon for Light oil or LDO Burner control, Furnace Oil Burner control and High Velocity Oil Burner control These autocons are fitted in a strong mild steel made or plastic made enclosure. Also, the products are provided with either screwable or pluggable connectors which help in connecting with rest of the burner.

Thermocouple WelderProduct Details:Output Current 1-100 A ApproxAutomatic Grade AutomaticAuto Power Off ProvidedBrand DiligentUsage IndustrialVoltage 220 - 380 VFrequency 50 - 60 Hz

AC Surge ProtectorProduct Details:Material PlasticBrand Tripp LiteOutput 600 VAOutput Nominal Voltage 120 VOutput Nominal Frequency 60 HzInput Cord Length 9 feet or 1.83 mFront Panel LEDs 3 LEDs indicate incoming voltage statusUPS AC Suppression Joule Rating 720 joulesEMI or RFI AC Noise Suppression 20 dBProduct Warranty Period Worldwide 2-year limited warrantyModel LS604Tripp Lite's LS604 automatic voltage regulation system offers complete protection from brownouts, overvoltages and transient surges for computers, printers, fax machines and more. Transformer-based voltage correction circuits maintain usable 120V nominal AC output during brownouts as low as 87V and overvoltages to 140V. Network grade equipment protection offers AC surge and noise suppression. Supports loads up to 600 watts. Includes 4 NEMA5-15R outlets, 6-foot line cord and 3 diagnostic LEDs that display incoming voltage level, surge protection status and line fault conditions.

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