Omega Engineering LVU-90 User's Manual
Contents
1. Step One Range 3 6 to 6 9 cm to 1 8 m 2 8 Accuracy 25 of span in air 71mm Resolution 0 125 3 mm lt gt Frequency 83 kHz nominal k Pulse rate 2 pulses per second A Beam width 8 conical zm Dead band 3 6 9 cm al x Supply voltage 12 36 VDC Sy Max loop resistance 600 Ohms 36 VDC ale Signal output 4 20 mA 12 36 VDC ais k Fail safe diagnostics Reverts to 22 mA 3 gt t LED flashing Temperature rating F 40 to 140 4 C 40 to 60 Temp compensation Automatic over entire range Pressure rating 30 psi 2 bar 25 C derated 1 667 psi 0 113 bar per C above 25 C Enclosure rating NEMA 4X IP65 Enclosure material Polypropylene U L 94VO Transducer materials PVDF Mounting threads 3 4 NPT for LVU 91 3 4 G for LVU 92 Mounting gasket Viton 3 4 G LVU 92 only Conduit connection 1 2 NPT CE compliance EN 50082 2 immunity EN 55011 emission pending ts About Ultrasonic Technology lt An ultrasonic sound wave is pulsed five times per second from the gts base of the transducer The sound wave reflects against the process medium below and returns to the transducer The microprocessor lt gt based electronics measures the time of flight between the sound gen aor eration and receipt and translates this figure into the dist2. DC Power S o Supply olls if t N 12 36 VDC l4 8 WK o 81 3 F Ge SUT e 1 28 fi N Z e o A 250 Q resistor typically internal to PLC Step Five The LVCN 90 transmitter may be installed through the top wall of a tank Installation requires a 3 4 NPT fitting or blind flange 1 Install the appropriate 3 4 fitting in the top wall of the tank Prior to installation make sure that the fitting has been installed prop erly and checked for leaks Use a proper sealant at the time of installation to ensure a liquid tight seal Secondly make sure that the fitting s threads are not damaged or worn 2 Insert the Transmitter into the fitting and tighten to hand tight Always check for leaks prior to system start up To ensure proper installation a complete leak test and simulation of actual process conditions should be preformed Flange Fitting Installation Installation Ce a paat A Warning A Do not install the LVCN 90 in pressurized applications above 30 psi Always install the 3 4 Viton gasket with the LVCN 92 The LVCN 92 G threaded version will not seal unless the gasket is installed properly erly and checked for leaks Use a proper sealant at the time
3. P WR LATCH RELAY 1 RELAY 2 O fH O O onor INVERT pia INVERT piv EASY CAL S as Oe 9009 mmm 2 28 L CO Beef P OWN SET OFF SET 2 Wiring to a Two Wire Loop Powered Indicator The LVCN 90 requires 12 36 VDC power and an indicator which receives a 4 20 mA current input Connect the terminal of the LVCN 90 transmitter to the positive VDC terminal on the power supply Connect the terminal on the LVCN 90 to the ter minal on the loop indicator Connect the of the loop indicator to the of the power supply See illustration below supply 8888 12 36 VDC 7 u 12 96 VDC eno T il Ui 3 Wiring to a Typical PLC The LVCN 90 requires a PLC which provides a 12 36 VDC exci tation and receives a 4 20 mA current input Connect the ter minal of the LVCN 90 transmitter to the positive VDC power ter minal Connect the terminal on the LVCN 90 to the chan nel on the PLC Connect the of the PLC to the of the power terminal See illustration below
4. Where Do I Find Everything l Need for Process Measurement and Control OMEGA Of Course TEMPERATURE ad Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies A Wire Thermocouple RTD amp Thermistor Calibrators amp Ice Point References LY Recorders Controllers amp Process Monitors LY Infrared Pyrometers PRESSURE STRAIN AND FORCE LY Transducers amp Strain Gauges 4 Load Cells amp Pressure Gauges LY Displacement Transducers Z Instrumentation amp Accessories FLOW LEVEL LF Rotameters Gas Mass Flowmeters amp Flow Computers Air Velocity Indicators Z Turbine Paddlewheel Systems Z Totalizers amp Batch Controllers pH CONDUCTIVITY A pH Electrodes Testers amp Accessories LY Benchtop Laboratory Meters EF Controllers Calibrators Simulators amp Pumps Industrial pH amp Conductivity Equipment DATA ACQUISITION 4 Data Acquisition amp Engineering Software 4 Communications Based Acquisition Systems l Plug in Cards for Apple IBM amp Compatibles Y Datalogging Systems AW Recorders Printers amp Plotters HEATERS LY Heating Cable 4 Cartridge amp Strip Heaters EF Immersion amp Band Heaters EF Flexible Heaters LY Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL LF Metering amp Control Instrumentation IF Refractometers LF Pumps amp Tubing A Air Soil amp Water Monitors Industrial Water amp Wastewater Treatment
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7. L7 pH Conductivity amp Dissolved Oxygen Instruments M 3444 0799 User s Guide CE OM MEGA Technologies Company http www omega com e mail info omega com LVU 90 Series Ultrasonic Level Transmitter suone gt i dde pay2auU0 gt uaned 404 pasn aq OU pInous pue ut sn 104 paublsap jou ave spnpo d s u NINYYM 3nou INOW suone3ul ds 1 l 0 JYHU ayy Sa uasal pue sure u0d 1 S1011 Aue Joy Qillqe ou sydaoze ul 5uu ui5u3 YII WO Iq P240 aq 0 p A ll q S JUaWINDOP sit u PaUJeyUOD uoneuuoju BY uone3ljni 3 uodn adiaap ayetdoudde Aland ew 3D ppe M V 3NWO Sag YDeoiddy m y Ueadoiny ayy 0 sionpoid sy Jo uone3uni 3 Huinsund Agueysuod si YOIWO Ajdde ey suonen IIW3 2IN3 pue Ayes DIMDHOA le WM Ajdw0d 0 YOIWO 40 Adijod SIY uo ebun ews 887 887 0080 pue 6u3 u 344 10 TZ99 LLL T91 vv X Wd ZT688Z SSVT vt X V4 TI99 LLL T91 vy PL OZSS8Z SSVT 7h PL pue 6u3 XIS tr W puelBu3 N19 637 BYSSUPUE W we 1tus 1so2p1 Aps y uoyu6noig p ym 9 Z006 OSI sauq eowo Z xog Od peoy uoybuluuems sz wop3ury parun wo efowapAuewps jew 99 TZ TL OETO uew 9 U 8844 ll0L 0tS8 99020 6p X V4 LTOE 95020 6p PL Aueuupo uuoujdu xp q Z6ESL C OZ ssens luiq erqsny Kueuu s Uuuo2 e6 uuoDooueuJ IeLU ZVE90 7 0080 2ue14 UJ B44 10L 00 1Z9 0ET E PL dde 0618 uideg siu q and 6 DWLI uuo2 e6 tuoDup gt
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9. of installation to ensure a liquid tight seal Secondly make sure that the fitting s threads are not damaged or worn Avoid Do not LZ R Interference from install at SNIE side of tank an angle Avoid 5 Interference from 5 siya S obstructions in s liini tank a a VACUUM CALIBRATION CALIBRATION Step Six The LVCN 90 is factory calibrated with a fixed measurement span of 6 feet The 4 mA position is located 72 from the transducer face The 20 mA position is located 3 6 inches from the transducer face Refer to the current to distance and distance to current conversion charts in step seven for reading the current output 1 Connect a multimeter in series to read the current output 2 Verify that as the distance from the liquid to the LVCN 90 increases the current signal decreases 3 Verify that as the distance from the liquid to the LVCN 90 decreases the current signal increases Power Power Supply 4 5 6 Supply io 20 94 Gi mA Cy ed com 2y 20 mA 72 4mA Y LED Indication The LVCN 90 features a single LED indicator which is used for power and fail safe indication During normal operation the LED will be ON continuously to indicate that the transmitter has power and a strong echo s
10. power failure In critical applications OMEGA rec ommends the use of redundant backup systems and alarms in addi tion to the primary system A Flammable Explosive and Hazardous Applications The LVU 90 series transmitter systems should not be used within flammable or explosive applications A Warning A Always install the 3 4 Viton gasket with the LVU 92 The LVU 92 G threaded version will not seal unless the gasket is installed properly Step Three Wiring to Terminal The LVU 90 arrives from the factory pre calibrated and pre assem bled Use the following instructions below for wiring to the LVU 90 1 First remove the cap of the transmitter 2 Look for the terminal block with two terminals 12 36 VDC 3 Remove the terminal block to wire the LVU 90 The terminal to the right is positive and the terminal to the left is negative 4 When finished attaching the wires assemble the LVU 90 using steps 1 3 in reverse WIRING INSTALLATION Step Four Follow the instructions in Step 3 for wiring to the LVU 90 1 Wiring to an OMEGA Continuous Controller LVCN 51 Connect the terminal to the positive 24 VDC 25 mA terminal on the controller Connect the terminal to the GND terminal on the continuous controller See illustration below Check LVCN 51 instruction manual for setting the LVCN 51 for loop powered operation
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12. transmitter controller and or power supply is completely disconnected 2 Sensor Removal In all through wall installations make sure that the tank is drained well below the sensor prior to removal Carefully remove the sensor from the installation 3 Cleaning the Sensor Use a soft bristle brush and mild detergent carefully wash the transducer of the LVCN 90 Do not use harsh abrasives such as steel wool or sandpaper which might damage the transmitter s surface Do not use incompatible solvents which may damage the PVDF transducer or the transmitter s PP body 4 Sensor Installation Follow the appropriate steps of installation as outlined in the installation section of this manual
13. ance between 6 Range Y lt the transmitter and process medium below lt W S lt POWER 20 8 Cone o W Radius 2 8 Range Radius Radius Feet Inches cm 1 1 2 3 1 2 2 1 5 2 3 2 9 7 3 4 3 7 9 5 5 4 9 11 6 6 5 4 13 7 Maximum Temperature Voltage Derating Temperature Pressure Derating Continuous 20 mA Curve T Electrical Loading Limits 35 g100 700 Unacceptable 6 2 30 Range 80 z cs z 600 Unacceptable 25 g 500 Range 8 20 ji 2 60 400 a cceptable 5 i gt 15 m Range 2 40 Acceptable xc 30 fo Range m 10 F 2 a S 200 ss 05 5 a eee Es 400 3 00 E0 000 140 20 00 20 40 60 Te 20 22 209 702 06 18 24 30 36 Temperature C Operating Voltage VDC Supply Volyage VDC SAFETY PRECAUTIONS WIRING Step Two A About this Manual PLEASE READ THE ENTIRE MANUAL PRIOR TO INSTALLING OR USING THIS PRODUCT This manual includes information on the LVU 90 series continuous non contact level transmitter from OMEGA Please refer to the part number located on the sensor label to verify the exact model which you have purchased A User s Responsibility for Safety OMEGA manufactures a wide range of liquid level sensors and technologies While each of these sensors is designed to operate in a wide variety of applications it is the user s responsibility to select a sensor model that is appropriate for the application insta
14. ignal return strength Should the LED begin to FLASH it indicates that the transmitter has no signal return strength and the device has gone into a fail safe condition During the fail safe condition the current will increase up to 22 mA and hold until the acoustic signal is reacquired Once reacquired the LED will turn back ON continuously and the current will indicate the appropriate mea sured value Step Seven Current to Distance Conversion Chart Nominal Current Distance Current Distance Current Distance mA inches mA inches mA inches 20 03 6 14 29 2 08 54 9 19 07 9 13 33 5 07 59 2 18 12 1 12 37 8 06 63 5 17 16 4 11 42 1 05 67 7 16 20 7 10 46 3 04 72 0 15 25 0 09 50 6 Distance to Current Conversion Chart Nominal Distance Current Distance Current Distance Current inches mA inches mA inches mA 3 6 20 0 30 13 8 60 06 8 06 19 4 36 12 4 66 05 4 12 18 0 42 11 0 72 04 0 18 16 6 48 09 6 24 15 2 54 08 2 MAINTENANCE Step Eight Step Nine General The LVCN 90 series level transmitter itself requires no periodic maintenance except cleaning as required It is the responsibility of the user to determine the appropriate maintenance schedule based on the specific characteristics of the application liquids Cleaning Procedure 1 Power Make Sure that all power to the
15. ll it properly perform tests of the installed system and maintain all components The failure to do so could result in property damage or serious injury A Proper Installation and Handling Because this is an electrically operated device only properly trained staff should install and or repair this product Use a proper sealant with all installations Note Always install the 3 4 Viton gasket with the LVU 92 The G threaded version will not seal unless the gasket is installed properly Never overtighten the trans mitter within the fitting Always check for leaks prior to system start up A Wiring and Electrical A supply voltage of 12 36 VDC is used to power the transmitter The sensor systems should never exceed a maximum of 36 volts DC Electrical wiring of the sensor should be performed in accor dance with all applicable national state and local codes A Material Compatibility The enclosure is made of Polypropylene PP The transducer is made of Polyvinylidene Fluoride PVDF Make sure that the model which you have selected is chemically compatible with the application liquids it will contact Enclosure While the transmitter housing is liquid resistant when installed properly it is not designed to be immersed It should be mounted in such a way that the enclosure and diaphragm do not come into contact with fluid A Make a Fail Safe System Design a fail safe system that accommodates the possibility of transmitter or
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