Omega LV800 User's Manual
Contents
1. Standard Probe 2 3 4 NPT 1 1 4 NPT 3 4 NPT w 1 1 4 NPT 127 0 100 125 L DRIVEN SHIELD PROBE 75 19 0 STD UNLESS SPECIFIED XX XXmm Stub Probe SAFETY General Safety CAUTION It is essential that all instructions in this manual be followed to ensure proper operation of the equipment and safety of operating person nel Use of equipment not specified herein may impair protection provid ed by equipment The use of this symbol is used throughout manual to highlight important safety issues Please pay particular attention to these items Electrical Shock Caution Certain LV800 models are powered with HIGH VOLTAGE No operator serviceable parts are inside All servicing is to be performed by qualified personnel Each MK 2e is provided with a protective conductor terminal which shall be terminated to earth ground potential See Electrical Installation This products design complies with EN61010 1 installation category 11 and pollution degree 2 Electromagnetic Compatibility EMC The LV800 was tested and found to comply with the standards listed below The LV800 should not be used in residential or commercial envi ronments Compliance to EMC standards was demonstrated by means of a test setup using the following installation methods 1 LV800 enclosure was connected to earth ground protective earth 2 No specific wiring convention was used to supply power or to retrieve output2. Shop online at omega com OO OMEGA omega com e mail info omega com For latest product manuals omegamanual info LV8OO SERIES Capacitance Point Level Sensors omega com CO OMEGA OMEGAnet Online Service Internet e mail omega com info omega com U S A ISO 9001 Certified Canada Servicing North America One Omega Drive P O Box 4047 Stamford CT 06907 0047 TEL 203 359 1660 FAX 203 359 7700 e mail info omega com 976 Bergar Laval Quebec H7L 5A1 Canada TEL 514 856 6928 FAX 514 856 6886 e mail info omega ca For immediate technical or application assistance U S A and Canada Mexico Benelux Czech Republic France Germany Austria United Kingdom ISO 9002 Certified Sales Service 1 800 826 6342 1 800 TC OMEGA Customer Service 1 800 622 2378 1 800 622 Engineering Service 1 800 872 9436 1 800 USA WHEN TELEX 996404 EASYLINK 62968934 CABLE OMEGA En Espafiol 001 203 359 7803 e mail espanol omega com FAX 001 203 359 7807 info omega com mx Servicing Europe Postbus 8034 1180 LA Amstelveen The Netherlands TEL 31 0 20 3472121 FAX 31 0 20 6434643 Toll Free in Benelux 0800 0993344 e mail sales omegaeng nl Frystatska 184 733 01 Karvin Czech Republic TEL 420 0 59 6311899 FAX 420 0 59 6311114 Toll Free 0800 1 66342 e mail info omegashop cz 11 rue Jacques Cartier 78280 Guyancourt France TEL
3. 33 0 1 61 37 2900 FAX 33 0 1 30 57 5427 Toll Free in France 0800 466 342 e mail sales omega fr Daimlerstrasse 26 D 75392 Deckenpfronn Germany TEL 49 0 7056 9398 0 FAX 49 0 7056 9398 29 Toll Free in Germany 0800 639 7678 e mail info omega de One Omega Drive River Bend Technology Centre Northbank Irlam Manchester M44 5BD United Kingdom TEL 44 0 161 777 6611 FAX 44 0 161 777 6622 Toll Free in United Kingdom 0800 488 488 e mail sales omega co uk It is the policy of OMEGA Engineering Inc to comply with all worldwide safety and EMC EMI regulations that apply OMEGA is constantly pursuing certification of its products to the European New Approach Directives OMEGA will add the CE mark to every appropriate device upon certification The information contained in this document is believed to be correct but OMEGA accepts no liability for any errors it contains and reserves the right to alter specifications without notice WARNING These products are not designed for use in and should not be used for human applications IV800 SERIES This manual contains the information necessary to ensure a safe and successful installation Please read and comply with the section on page 9 of this manual pertaining to SAFETY Doing so will ensure proper oper ation of the equipment and the safety of all personnel qm Before discarding shipping container please inspect it thoroughly and verify that all parts ordered a
4. 4 Insert probe through fitting Do not use sealant tapes e g Teflon tape or putties When using the 1 1 4 NPT connection grease threads with anti seize then thread unit tightly into place by gripping and rotating housing When using the 3 4 NPT connection thread unit tightly into place by gripping and rotating 15 16 inch 24 mm wrench flats provided on fitting Continuity between sensor mounting point and vessel wall must be maintained to assure proper probe operation DIMENSIONS ARE SHOWN IN INCHES WITH MILLIMETER EQUIVALENT IN BRACKETS MOUNTING 1 1 4 WELD HALF COUPLING TO VESSEL WALL TIGHTEN amp LOOSEN USING HOUSING NOT THE COVER CUT 1 50 40 0 DIA HOLE IN VESSEL POSITION THE USED CONDUIT CONNECTIONS HORIZONTAL OR DOWNWARD STD UNLESS SPECIFIED XX xxmm Figure 3 MOUNTING 3 4 NPT THREADS WELD 3 4 NPT HALF COUPLING TO VESSEL WALL SS 7 CUT 88 22 0 DIA y HOLE IN VESSEL POSITION THE USED TIGHTEN amp LOOSEN CONDUIT CONNNECTIONS USING THE 15 16 24 0 HORIZONTAL OR DOWNWARD WRENCH FLATS HOUSING COVER STO UNLESS SPECIFIED XX XXmm Figure 4 ELECTRICAL INSTALLATION Factory Wiring The LV800 probe wires are connected to the backside of the PCB DO NOT alter this connection Doing will likely cause improper operation of the sensor Permanently Connected Equipment Disconnecting devices shall by included in the system inst
5. company will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER EXPRESSED OR IMPLIED EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract warranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activity medical application used on humans or misused in any way OMEGA assumes no responsibility as set forth in our basic WARRANTY DISCLAIMER language and additionally purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product s in such a manner RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the OMEGA Customer Service Department BEFORE RET
6. experience a wide temperature swing are the most vulnerable Consult factory for support PROBLEM Output contacts perform opposite of designations N O N C CAUSE SOLUTION 1 Designations on PCB relate to relay status when in Fail Safe Low mode and when no material is sensed If Fail safe High mode is used the designations are reversed Swap wire terminations of and N C if necessary Changing the fail safe selection is not recommended Fuse Replacement The fuse incorporated into the LV800 PCB is not intended for operator replacement A qualified technician can replace the applicable fuse according to the following specifications If nec essary consult the factory for additional technical assistance or for return of the LV800 115VAC F1 5x20mm 0 63A Time Lag Slo Blo 250VAC Littelfuse 218 063 Bussman GDC 63mA 230VAC F1 5x20mm 0 32A Time Lag Slo Blo 250VAC Littelfuse 218 032 Bussman GDC 32mA Preventive Maintenance The LV800 design is virtually maintenance free In typical applications once the sensor is properly calibrated it will oper ate without any further attention In abrasive applications probe condition should be periodically observed Although the probe s construction is made with high quality engineering plas tics heavy abrasion can wear away the probe s insulators This can influence the calibration and eventually lead to sensor fail ure The electronics are housed in a weatherp
7. signal from the LV800 EMC Emissions Meets EN 61326 1 Electrical Equipment for Control Use EMC EN 55011 Radiated and conducted emissions Class A industrial EN 61000 3 Fluctuations Flicker Meets Part 15B CISPR 11 HF Devices Unintentional Radiators Radiated and conducted emissions Class A industrial EMC Immunity Meets 61326 1 Electrical Equipment for Control Use EMC IEC 1000 4 2 Electrostatic discharge industrial IEC 1000 4 3 HF radiated EM fields industrial IEC 1000 4 4 Electrical fast transients industrial IEC 1000 4 5 Electrical surges industrial IEC 1000 4 6 RF conducted EM energy industrial IEC 1000 4 8 Power frequency magnetic fields industrial 1000 4 11 Source voltage deviation Power Altitude Installation Category Pollution Degree Ambient Op Temp Internal Bin Temp Output Relay External Indicators Sensitivity Stability Time Delay Fail Safe Build up Immunity Enclosure Conduit Connection Approvals SPECIFICATIONS 115VAC 15 2 5VA 50 60Hz 230VAC 1590 2 5VA 50 60Hz 6562 ft 2000 m max 4 Reduced to 2 by enclosure Suitable for indoor outdoor use 40 40 C to 150 F 65 C To 176 80 C w alum mount lt 104 F 40 C ambient To 400 204 C w SS mount lt 122 F 50 C ambient SPDT 5A Q 250VAC 30VDC maximum Red and green LEDs indicating power and operating mode Multi turn p
8. written consent of OMEGA ENGINEERING INC Where Do Find Everything Need for Process Measurement and Control OMEGA Of Course Shop online at TEMPERATURE WA Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies WA Wire Thermocouple RTD amp Thermistor lA Calibrators amp Ice Point References Recorders Controllers amp Process Monitors lA Infrared Pyrometers PRESSURE STRAIN AND FORCE WA Transducers amp Strain Gages WA Load Cells amp Pressure Gages WA Displacement Transducers WA Instrumentation amp Accessories FLOW LEVEL WA Rotameters Gas Mass Flowmeters amp Flow Computers WA Air Velocity Indicators WA Turbine Paddlewheel Systems lA Totalizers amp Batch Controllers pH CONDUCTIVITY WA pH Electrodes Testers amp Accessories WA Benchtop Laboratory Meters WA Controllers Calibrators Simulators amp Pumps WA Industrial pH amp Conductivity Equipment DATA ACQUISITION WA Data Acquisition amp Engineering Software WA Communications Based Acquisition Systems WA Plug in Cards for Apple IBM amp Compatibles lA Datalogging Systems Recorders Printers amp Plotters HEATERS WA Heating Cable WA Cartridge amp Strip Heaters WA Immersion amp Band Heaters WA Flexible Heaters WA Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL WA Metering amp Control Instrumentation WA Refractometers WA Pumps amp Tubing lA Air S
9. URNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence The purchaser is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit FOR WARRANTY RETURNS please have the FOR NON WARRANTY REPAIRS consult OMEGA following information available BEFORE for current repair charges Have the following contacting OMEGA information available BEFORE contacting OMEGA 1 Purchase Order number under which the prod 1 Purchase Order number to cover the COST uct was PURCHASED of the repair 2 Model and serial number of the product under 2 Model and serial number of the product and warranty and 3 Repair instructions and or specific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGA s policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering OMEGA 15 a registered trademark of OMEGA ENGINEERING INC Copyright 2005 OMEGA ENGINEERING INC rights reserved This document may not be copied photocopied repro duced translated or reduced to any electronic medium or machine readable form in whole or in part without the prior
10. WABLE INDICATOR ORDINARY LOCATION INTEGRAL MODELS Z RED GREEN NON OPERATE MATERIAL NOT SENSED EITHER POWER PRESENT IN SENSOR DPERATE MATERIAL SENSED Figure 9 2 Red LED Its status describes the operate output condi tion of the LV800 Illumination indicated the relay is in the operate material sensed condition Its state is influenced by the time delay setting but not by the fail safe setting This LED is aimed at the lens in the cover so it can be seen with the cover on or off 3 Green LED Its status indicates no material sensed con dition of the LV800 in combination with the time delay set ting If material has not been sensed for a long enough time as set by the time delay setting this LED will be illu minated The red and green LEDs should never be illumi nated at the same time The green LED s state is not affected by the fail safe setting This LED is also aimed at the lens in the cover so that it can be seen with the cover on or off TROUBLESHOOTING MAINTENANCE PROBLEM Sensor will not sense material CAUSE SOLUTION 1 Verify power is applied to the sensor 2 Verify Sense Adjust Reposition adjustment clockwise therefore making the probe more sensitive to difficult to sense materials 3 Verify probe coverage when sensing is expected The sen sor is not designed to be tip sensitive Permit significant probe coverage before expecting material sensing 4 Verify electrical contin
11. alibration procedure One procedure sets the sensitivity with the probe being exposed to the material while the second pro cedure exposes the probe to free air only Since the capaci tance being measured is directly related to the material being sensed the best results will be achieved by setting the calibra tion while the probe is exposed to the application material 2 Step Calibration probe exposed to material 1 While the probe is not covered with material rotate Sense Adjust clockwise just until Sense yellow LED turns 2 Permit the application material to cover the probe While counting the number of revolutions rotate Sense Adjust counter clockwise until the Sense yellow LED turns off Reposition Sense Adjust at the half way point between the LED on and LED off settings e g After insert ing the probe into the material if it takes 2 counter clockwise turns of Sense Adjust for the Sense yellow LED to turn off then Sense Adjust should be repositioned 1 clockwise turn SENSO R CONT RY LO ROLS amp INDICATO CATION MODELS ORDINA DE RE D ADJUST ED 0 D ROBE TIME DELA FAIL SAFE SWITCH OUT BLOCK E RMINAL Figure 6 2 Step Calibration probe exposed to
12. alla tion In installations were multiple circuits are used i e inde pendent circuits for power input and output relay individual disconnects are required The disconnects shall be within close proximity of the equipment accessible to operators and marked appropriately as the disconnect for the associated cir cuit Assure the disconnect ratings are appropriately sized for the circuit protected See Specifications Circuit Separation Two cable entry locations are provided to aid in maintaining separation of hazardous live typically mains voltages such as 115VAC and 230VAC and limited circuits typically control voltages less than 30Vrms or 42 4VDC However since the LV800 single wiring compartment can not absolutely protect against physical contact between multiple circuits it is required that all wiring used must have an insulation rating of 300V min imum and a temperature rating of 80 C 176 F minimum Protective Earthing amp Each LV800 is provided with a protective conductor terminal which shall be terminated to the local earth ground potential to eliminate shock hazard in the unlikely event of internal insula tion breakdown Select wire size that can carry in excess of the sum of all circuit s maximum amperage Power Input See Figure5 The LV800 is designed to accept either 115VAC or 230VAC factory set Verify the intended voltage supply is compatible with the voltage configuration indicated on the el
13. ectronics and the external nameplate Connect power as shown in Figure 5 Select wire size that can deliver suitable voltage and current for the application Output Relay Contacts See Figure 5 The LV800 is equipped with one or two sets of isolated contacts which indicates whether or not material is being detected with in the vessel This output is also influenced by the selection of the fail safe switch as described in the Calibration section of this manual The designations on the circuit board relate to the contact status when the material is not sensed and the fail safe switch is in the mode These contacts can be con nected to any type of control device provided that ratings are observed See Specifications Select wire size that can deliv er suitable voltage and current for the application WIRINC DINA DIAGRAM RY LOCATION MODE N H 115Vac L gt 14 Z230Vgc Figure 5 CALIBRATION Sensitivity See Figure 6 Sensitivity is set in the field via a Sense Adjust 25 turn poten tiometer The Sense Adjust tunes the sensitivity of the LV800 to the material being sensed Rotating the adjustment in a clockwise direction will increase the sensitivity making the material easier to detect There are two different procedures which can be used in the calibration process Both utilize the simple 2 Step C
14. free air only 1 Rotate Sense Adjust clockwise just until the Sense yellow LED turns on 2 Reposition Sense Adjust a number of turns counter clockwise with respect to the three described sensitivities below see Figure 7 It is desirable to reposition Sense Adjust in accordance to 2 Step Calibration probe exposed to material procedure once material can cover the probe Materials with high dielectric constants or conductiv ity require the sensitivity adjustment further counter clockwise than those applications with low dielectric constants SENSITIVITY SETTING OF THE LV800 SENSITIVITY NO OF MATERIAL DESCRIPTION ADU TURNS DIELECTRICS TYPICAL APPLICATIONS PLASTICS SOAP OILS RUBBER CEMENT GRAINS FERTILIZERS FEED SALT WASTEWATER SLURRIES ANY WATER BASED SOLUTIONS Figure 7 Delay A potentiometer is provided for setting the time delay between the time material is sensed Yellow LED on and the time the relay contact output changes Red LED on Units have a 1 turn potentiometer A clockwise rotation will increase the delay from 25 to 15 seconds This adjustment minimizes false sig nals associated with temporary material shifts The delay between the time material is not sensed Yellows LED off and the time the relay contact output changes Red LED off is fixed at 25 seconds Fail safe see Figure 8 The term fail safe refers to the output signal condition which occurs with a l
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16. oss of power to the probe A switch permits selection of either low or high fail safe High Fail Safe The relay will de energize when material is sensed at high level or with power loss Low Fail Safe The relay will de energize when material is below low level or with power loss Note the designations on the electronics label refer to the relay contact status when no material is sensed and low fail safe is selected Relay is de energized The designations are reversed when no material is sensed and high fail safe is selected Relay is energized POWER FAILURE CONDITIONS NORMAL SEMSING CONDITIONS RELAY DE ENERGIZED oN O N O oer Ais NAE RED ON A r Ln EJ RELAY DE ENERGIZED 0N O E Ms Q RED OFF sa OFF Roo RELAY DE ENERGIZEB o N O 9 0 O RED OFF RELAY ENERGIZED RED OFF OFF CRN ON A FAIL SAFE HIGH SETTING RELAY RELAY ENERGIZED DE ENERGIZED 3 N O o Mg We Tn RED ON O RED OFF p OFF CRN ON B FAIL SAFE LOW SETTING Figure 8 Indicators See Figure 9 1 Yellow LED Its status describes the sensing condition of the LV800 Illumination indicated that the amount of capac itance established by the Sense Adjust has been detect ed Its status is not affected by the time delay setting of the fail safe setting This LED can only be seen when the cover has been removed SENSOR EXTERNALLY VIE
17. otentiometer adjustment 0 5pf to 150 pf 0 015pf per degree F 0 027pf per degree C 0 25 to 15 sec delay to activate adjustable 0 25 sec delay to deactivate fixed Switch selectable H LO Protected via driven shield to 150 ohm load Cast alum screw on cover beige polyester pwdr coat NEMA 4 IP66 Two 2 3 4 NPT connections CSAys CSA Ordinary Locations CE Mark Ordinary location only 0 5pf setting Standard Food Grade Probe Mounting Probe Material Probe Length Temp Probe Only Pressure Stub Probe Mounting Probe Material Probe Length Temp Probe Only Pressure 1 1 4 NPT alum or combo 3 4 NPT 31655 and 1 1 4 NPT alum 3 8in 9 5mm dia 31655 probe amp guard PPS insulators 16in 406mm from alum mounting PPS 450 F 232 C max 50 psi 3 5 bar max alum connection 150 psi 10 bar max 3 4 NPT 55 1 1 4 NPT alum or combo 9 4 31655 and 1 1 4 NPT alum 3 8in 9 5mm dia 31655 probe amp guard PPS insulators Cut to customer specification application dependent PPS 450 F 232 C max 50 psi 3 5 bar max aluminum 150 psi 10 bar max 3 4 NPT SS Influenced by mounting material thermal conductivity and ambient temperature MADE FINI USA WARRANTY DISCLAIMER OMEGA ENGINEERING INC warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase OMEGA s WARRANTY adds an additional one 1 month grace
18. period to the normal one 1 year product warranty to cover handling and shipping time This ensures that OMEGA s customers receive maximum coverage on each product If the unit malfunctions it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser includ ing but not limited to mishandling improper interfacing operation outside of design limits improper repair or unauthorized modification This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of OMEGASs control Components in which wear is not warranted include but are not limited to contact points fuses and triacs OMEGA is pleased to offer suggestions on the use of its various products However OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA either verbal or written OMEGA warrants only that the parts manufactured by the
19. re accounted for Sometimes smaller parts become stuck under carton flaps and other packaging materials PRE INSTALLATION CONSIDERATIONS Choosing a Location See Figure 2 1 Material Flow When selecting a location for the LV800 choose a point in the vessel where the probe will be out of the direct flow of incoming and outgoing material to prevent any mechanical damage that may be caused by the pres sure of the flow The LV800 must be positioned at a point where incoming material will reach and cover the probe in its normal flow and when receding will flow away from the probe in an even manner For best results choose a posi tion where a majority of the probe not just the tip will be covered This is particularly important when detecting mate rials with low relative dielectric constants and low product densities The unit will not operate as a tip sensitive device For extended length models allow for at least 8 to 12 inches 203 305 mm of probe coverage When sensing highly conductive materials or those with a high dielectric constant the LV800 can perform as a tip sensitive sensor 2 Vessel Contact Select an area where the probe can not contact any internal structure elements of the vessel 3 Driven Shield Penetration Select a location which ensures that the driven shield section protrudes into the ves sel and is not recessed in the mounting neck 4 Multiple Probe Proximity If more than one sensor is mo
20. roof enclosure In addition the PCBs are conformal coated with a silicone based material to further prevent electrical influence by con densation The sensor electronics should periodically be observed for any signs of contamination caused by improper enclosure protection i e insure cover is fully engaged and that wire entries are properly sealed Cleaning Requirements Environmental and hazardous location protection is highly dependent on the proper installation of the cover to the hous ing A lubricant is applied to the housing cover threads to enhance ability to twist on twist off cover Clean and re lubri cate threads if necessary to insure trouble free operation Do not physically alter threads in anyway otherwise environmental or hazardous location protection could be compromised The driven shield feature of the LV800 is designed to minimize the need for cleaning the probe portion of the sensor In appli cations where material build up is so excessive that electronics can not adequately compensate probe cleaning may be nec essary If so wipe the probe with a clean damp cloth from the housing to the probe tip MECHANICALS DIMENSIONS ARE SHOWN IN INCHES WITH MILLIMETER EQUIVALENT IN BRACKETS 2 3 4 NPT 1 1 4 NPT fi x c 3 4 NPT 75 19 0 E w 1 1 4 NPT DRIVEN SHIELD 16 00 406 4 p PROBE 9 12 3 0 HOLE FOR EXT p STD UNLESS SPECIFIED XX XXmm
21. uity between sensor housing and ves sel wall 5 Verify connection of the electronic module to the probe PROBLEM Sensor remains in the SENSE mode even when material is absent CAUSE SOLUTION 1 Verify the active probe is not in direct contact with any inter nal vessel structure If so reposition sensor 2 Verify Sense Adjust setting Reposition adjustment counter clockwise therefore making the probe less sensitive to easy to sense materials 3 Verify there is not a large buildup of material between the active probe and the probe housing See Cleaning in the Maintenance section of this bulletin PROBLEM Sensor does not seem to hold its calibration CAUSE SOLUTION 1 Verify that the sense adjust is positioned at ideal point as described in 2 Step Calibration procedure Placing setting too close to threshold can create nuisance false signals 2 Maximize probe coverage of material being sensed Difficult to detect materials i e low dielectric or light mate rials are more easily detected when more probe is covered Avoid setups where probe tip sensitivity is required 3 Insure electrical continuity between the probe s mounting point 3 4 NPT or 1 1 4 NPT and the bin wall Sealant tapes i e Teflon tape can electrically isolate these regions and make sensing more difficult 4 Assess the temperature swing that the electronics sees in application Applications with difficult to detect materials and that
22. unted in the vessel do not place the sensors closer than 18 inches 457 mm from one another Cover Removal See Figure 1 Before loosening the cover loosen or remove the cover lock screw Spanner slots are incorporated on the top of the cover which should be used to loosen the cover from the housing Use a flat bar for initial loosening DO NOT use a strap or chain type wrench Keep hands clear of threads on the cover and housing to avoid contact with the thread lubricant COVER REMOVAI COVER REMOVAL SPANNER SLOTS COVER LOCK Figure 1 IN MAIN FLOW STRUCTURE EN SHIE RUDI RIVEN SHIELD WITHIN Figure 2 MECHANICAL INSTALLATION Standard Food Grade and Stub Probe Mounting See Figures 3 amp 4 1 Select a mounting location in accordance with the Pre Installation Recommendations 2 If using a welded fitting cut a hole into the side top of the vessel corresponding to the mounting connection 1 1 4 or 3 4 If using a mounting plate cut a 2 1 2 inch 64 mm center hole and six 11 32 inch Qmm mounting holes for 5 16 bolts on a 7 inch 178 mm bolt circle Use mounting plate as a template 3 Weld fitting or attach mounting plate to vessel wall
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