RF Admittance Type Level Limit Switch User Manual
Contents
1. Use appropriate size of spanner for rotating mounting bush True earths must be connected to the instrument Use recommended cable only for interconnection Weatherproofness of enclosure is guaranteed only if the cover is in place amp cable glands are adequately tightened VVVVVVV WV Safety Information amp Maintenance Before installing the admittance level controller please read these instruction s carefully and familiarize yourself fully with the requirement and functions of the instrument Please do not dispose off the carton or packing material until the unit has been inspected in all respects If the unit is received in damaged condition kindly note the dispatch details and inform us immediately Interconnection must be done as per the national standards If you find any difficulty or have any doubts about installing this product please do not hesitate to contact our service center for instant support Trouble Shooting LED indication does not changes 3 Relay not actuating but LED changes 4 Evaluating unit o k but but no change occurs When probe is connected Relay actuating but no output Probable cause No change in the level or evaluation unit is faulty LED driving circuit faulty Relay or its associated circuit is faulty Probe or inter connection wire 18 disconnected Relay contact worn out track discontinuity Remedy Check level or evaluation unit with other probe D2. RF Admittance Type Level Limit Switch User Manual amp Data Sheet RF Admittance Level Limit Switch Table of contents T 01 Zs AEA i 02 3 Featur 03 APP ALLO MIN OGG 04 al Di 05 6 Installation Guidelines 06 a COTON 07 O Precaution 5 08 E 09 IO TOUS S NOONE E 10 CCl ACS E 11 T 12 To EIS reer 13 Introduction Sapcon admittance level limit switch utilizing specially designed Immunocoat probe offers a reliable solution to level detection problems so far difficult to solve with Capacitance type system utilizing conventional probes The main advantage offered by admittance range of level switches is their ability to ignore build up and coating of material on the probe Purpose of adding a shield in between sensing element and ground is to avoid RF currents from reaching the container wall via the coating Although there would be RFcurrent flowing between the shield and the container wall via the build up i
3. 28 Sets Temp 1 200 C Model 81 622 ALL DIMENSIONS ARE IN mm DESCRIPTION ADMITTANCE TYPE LEVEL SWITCH Part Insulated ROD PROBE as Poor _ SAPCON INSTRUMENTS PVT LTD INDORE RF Admittance GA Drawing Recommended Spares Instrument having no moving part therefore no wear and tear However we advice to keep at least one set of card and probe assembly if population of instrument are more Warranty Instrument is manufactured as per the purchase order specification Standard guarantee for twelve months from the date of commissioning or eighteen months from the date of supply Which ever is earlier Guarantee is against manufacturing defects We undertake to correct such defects which are due to workmanship at our expenses Instrument should be forwarded to us on freight paid basis with seals unbroken The guarantee is valid for our customer and does not extent to third parties or caused by mishandling accident or abnormal conditions Customer Service If you require any assistance or clarification please free to contact with following details at the address given below A Instrument Model amp serial no B Purchase order no amp date C Problem observed Sapcon Instruments P Ltd 131 Palshikar colony Indore 452004 India Ph no 0731 2475751 52 53 4082751 Fax 0731 2475475 Email sapcon sapcon in service sapcon in Website www sapconinstruments com ou
4. 5 6 7 8 9 110 230 VAC 50 Hz Sense Probe Installation Figure 200 C C PROTEC COVER F 00 120 5 Angle lt Ny ff tT eT gt 4 aa 4 i 4 4 4 es lt A ae A MAINS __ ssecia Interconnection casle CONTROLLER HEIGHT 15 85mm L x H HOPPER Nozzel Pipe 50 with 2 Flange Mount ng OVERALL SIZE 218 X 135 X 85 mm EXCLUDING CABLE SLAND SIDE MOUNTED PROBE Calibration For DOT Display Model SLA M Series A DOT DISPLAY model serves as a Sensitivity indicator The indicator range is divided in to TEN parts The divisions are as follows Sensitivity Remarks Medium Relay switching region Sensitivity Regions The Following standard procedure should be carried out when tank is empty gt Switch ON the mains voltage gt Select the desired fail safe by using FSS toggle switch gt For versions provided with adjustable time delay turn the POT fully counter clockwise to the minimum delay condition gt Now rotate the sensitivity adjustment POT fully counter clockwise this condition the DOT display will be GREEN gt Fill the level up to the probe so that it covers the probe tip sufficiently gt Rotate the sensitivity POT gradually clockwise observing the DOT display move through the green and ye
5. iagnose the fault and remove the defective component As above Check cable connectivity and probe Replace relay check tracks Wire connections SAPCON INSTRUMENTS LTD INDORE oea LEVTESTER SLA 622 M RF SAPCON SENSIMVITY INDICATOR ALARM GREEN Y TIME DELAY am k COVERED _ UN FAIL SAFE COVERED SELECT lt lt AULT URN RELAY RELAY PROBE CONTACTS CONTACTS B W L N 20 260 AC PROBE EWALUATION UNIT INTERCONNECTION SHOULD ONLY BE DONE WITH SUPPLUED SPECIAL CABLE PROBE UNCOVERED CONTACTS CAUTION ARE SHOWM FOR FAIL SAFE HIGH CONTACTS WILL REVERSE FOR FAIL SAFE Low DOT DISPLAY CONNECTIONS GA Drawing 525 sae SEs age SPECIAL INTERCONNECTION CABLE SAPCON SCOPE RSs BBs 5 5 5 SES 55 ge CAST ALUMINIUM HOUSING 5 5 NEOPRENE SEAL 200 SE Sy 522 m STANDOFF PIPE FOR COOLING EVALUATION UNIT FOF MOUNTING THREADS 1 1 2 BSP 0D U Material MS PLATED 60 C C Grounding Pipe Gl G DIA 27 mm PTFE INSULATION MAINS 230 V AC gt Shield SS 316 27 mm 2 SPDT RELAY CONTACTS S S CONTACTS CONTROLLER HEIGHT IS 85mm L X BX H OVERALL SIZE 215 X 195 X 85 mm ID PTFE INSULATION EXCLUDING CABLE GLAND Sesing Rod SS 316 DIA 19 Customer M s Clalr Engineers Ltd Probe Length 550 mmy Qty
6. less steel Sensing part Stain less stec Mild steel plated Grounding pipe Galvanized steel Stain less steel mild steel plated Galvanized sleel Stain less steel Alurmnum Discharge In case of static charge build up device Installation Guidelines gt Instrument can be installed in almost any position gt Install probe in such way that sense shield amp non active length must come in active zone gt The threaded mounting connection should be as short as possible to avoid deposit of material in the nozzle cavity gt When mounting is from side the cable entry should be pointing downwards so that no moisture can enter gt Make sure that the probe insulation is not damaged when inserting through the nozzle Probe should be installed away from the inlet If it is not possible fix baffle plate 300 mm above from the probe Always refer the attached diagram before making the interconnection One such diagram is also pasted inside the evaluation cover Connect the mains supply as mentioned inside the cover Verify the line voltage before switching ON the instrument Interconnection b w probe and evaluation unit is made by special PTFE coaxial VV VV WV cable of pretrimmed length v Ensure control unit is earthed properly v Use three core cables of 1 5 sq mm diameters in case of AC power supply amp relay contacts Connection diagram Supply Relay Contact a 2 58 14
7. llow region to the RED region Continue the turning of potentiometer until the relay just operates This should occur close to the RED region gt Without disturbing the sensitivity POT reduce the level of material As the probe gets uncovered the DOT display will move from RED through Yellow to Green Record this display indication for future reference gt The calibration is now completed For BAR Display SLA B series The following standard procedure should be carried out when tank is empty Switch ON the mains power supply Select the desired fail safe by using FSS toggle switch For version provided with adjustable time delay turn the POT fully counter clockwise to the minimum delay condition Ensure all the four DIP switches just below SENS trimmer are in OFF position Note the display SENS DEV indicator If all the RED LEDs are glowing along with the alarm RED LED the turn the SENS trimmer slowly towards anticlockwise If alarm condition does not change then PUT DIP switches 1 to ON condition If the RED LED alarm still glows than put DIP switch 1 to OFF condition amp turn the DIP switch2 3 or 4 to ON condition till green LED glows amp note if SENS DIV indicator shows any LED glowing YYY VV WV gt Rotate the SENS trimmer slowly towards clockwise direction till display is ON SESN DIV indicator shows 4 LED s glowing gt the level up to probe so that it covers the probe tip sufficiently gt If
8. ounting Cable Entry 14 2 amp 1 for jack connector Cable Gland Single Double compression Size 12 34 BSP Brass Stainless steel NG20 Tolerable Ambient Temp 07 to 60 c Power consumption SV A approx Mains Supply 90 to 265 VAC 50 Hz universal power supply 110 230 VAC 50Hz Optional 24 VDC Fail Safe Mode Min field selectable One two set of potential free c o contacts rated at 230 for non inductive loads Red LED for alarm amp Green LED for Normal condition Sensitivity Indicator Ten dot display for sensitivity calibration also for showing the material trend in the vicinity of the probe Calibration Through multi turn potentiometer Measuring Frequency 100 KHz Response Time Less than 1 second Switching Delay Adjustable 5 to 20 seconds covered amp uncovered applicable for mode SLA322 M amp 622M Inter Connection Between Probe amp Evaluation unit by special coaxial cable with drain wire Refer attached drawing 10 amp 11 Housing Cast aluminum weather proof Cable entry One 5 BSP NPT BRASS Plastic Stainless Steel Cable eland Single double Compression Mounting Screw 1 7 1 2 VBSP NPT Flange per requirement Insulating PTFE Ceramic material Process Probes types available for 80 C 120 C 250 C 400C 600 C Temperature Extension Rod Stainless Steel Mild stee Plated Rope galvanized steel Stain
9. r products conform 10 50 9001 2008 18014001 D amp B es Regd Office amp Works 131 Palshikar Colony Indore 452004 M P India 91 731 4757575 500 to 599 4085751 4082751 2475751 52 53 91 731 2475475
10. t would not be considered by the measuring circuit and will not affect on the level measurement This unique design enables the electronic circuitry to distinguish between significant process coating and the actual process material thereby gives reliable accurate switching Operating Principle The sensing element and the container wall or ground electrode form a means to measure the admittance of the system with amp without the intervening material When all the parameters that affect the admittance value are kept constant then its value changes only due to the difference in material level The sensed signal is further amplified and used to actuate the relay The relay contacts are used for alarm or control purpose System Description amp Features A complete measuring system comprises I Evaluation unit II Immuno coat probe Interconnecting cable Immunocoat probe is of a special construction with three concentrically positioned electrodes that are electrically insulated from each other The innermost electrodes serve as the sense electrode whereas the one next to it is the shield and the outermost is ground The sense electrode is connected to a radio frequency source and the shield is also connected to the same source but through an isolating amplifier They therefore have identical waveforms and the shield follows the sense maintaining equivalent potential frequency and phase relationship Due to this there is no flow of RF c
11. the RED alarm LED glows along with the relay changeover than the calibration is complete gt Ifthe green LED still glows that further rotate the SENS trimmer clockwise till the RED alarm LED glows NOTE For probe uncovered and display set to 6th LED the Green indicator LED glows when FSS is set to High mode whereas Red indicator LED glows when FSS is set to Low mode Fail Safe Mode This is field selectable option depending upon the process requirement Maximum fail safe or minimum fail safe can be obtained by selecting the FSS toggle switch mounted in the centre of the PCB De energized condition of the relay is used to initiate an alarm Even if the mains supply fails or instrument doesn t work relay will initiate an alarm Maximum Fail Safe When the level rises and the material covers the probe the relay is de energized an alarm is initiated and Red LED glows For achieving this mode of operation shift the toggle switch to fail safe high Minimum Fail safe When the level falls and the probe is un covered the relay is de energized an alarm is initiated and Red LED glows For achieving this mode of operation shift the toggle switch to failsafe low Precautions Refer the diagram pasted inside the cover before making the interconnection Do not immediately energize the instrument until wires are fully secured In case of DC power supply instrument ve is ground Always tighten the housing cover and the cable entry securely
12. urrent between the Shield and the sense electrode The flow of RF currents via the shield to sidewalls does not affect the measurement due to isolation amplifier The probe head is of cast aluminum weatherproof construction provided with suitable cable glands and fitted on to the probe mounting arrangement A discharge device is provided with the system where there is a possibility of generation of static charge in the service material The immuno coat probe is connected to the evaluation unit with a special screened cable of pre trimmed length The Evaluation unit is housed in a cast aluminum weatherproof housing that is stoving enamel painted amp provided with three nos of cable entries of size The electronics and the inter connecting terminals are assembled on a glass epoxy printed circuit board that is heavily lacquered for rendering it immune to moisture dust amp fungus Application Note Admittance measurement using Immunocoat probe gives satisfactory solution in tough environments where 1 Material has a tendency to coat 2 There is bridging build up of material between probe and sidewall 3 Material particles with electrostatic charge and varying temperature float in the vicinity of the probe Technical Data Model Dot SLA 122M 222 322M 622M Bar SLA 3 122B 222B 322 622B Housing Cast Aluminum weather proof stoving enamel painted Siemens grey powder coated Epoxy coated suitable for back panel wall m
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