Installation, operation & service manual AlarmScout A15
Contents
1. o n M a are part Switch assembly 1 Housing cover consult factory Digit 10 11 2 O ring 012 2201 253 H9 or KQ 089 7401 104 3 O ring 012 2201 116 J9 or NQ 089 7401 122 4 Enclosing tube consult factory H9 or KQ 089 7401 110 6 E tube gasket 012 1301 002 J9 or NQ 089 7401 125 7 Proof er cable kit consult factory H9 or KQ 189 9109 901 8 Displacer cable kit consult factory J9 or NQ 189 9111 901 H9 or KQ 089 7412 004 J9 or NQ 089 7412 005 Part No 4417903_Rev 0 AlarmScout A15 Instruction amp installation manual 7 Honeywell Enraf For More Information To learn more about Honeywell Enraf s solutions contact your Honeywell Enraf account manager or visit www honeywellenraf com Americas Honeywell Enraf Americas Inc 2000 Northfield Ct Roswell GA 30076 USA Phone 1 770 475 1900 Email enraf us honeywell com Europe Middle East and Africa Honeywell Enraf Delftechpark 39 2628 XJ Delft The Netherlands Phone 31 0 15 2701 100 Email enraf nl honeywell com Asia Pacific Honeywell Pte Ltd 17 Changi Business Park Central 1 Singapore 486073 Phone 65 6355 2828 Email enraf sg honeywell com Honeywell 4417903_Rev 0 APRIL 2012 2011 Honeywell International Inc Enraf2. a Line Line NOTE 1 Double pole action is obtained by simultaneous operation of the right and left side single pole switches 2 Rising level closes contacts 5 amp 6 and 2 amp 3 3 Falling level closes contacts 4 amp 5 and 1 amp 2 Instruction amp installation manual 3 SET UP AND FUNCTIONS Operating cycle Osad 7 4 T errr ZA Switch position on rising level Switch position on falling level Floating roof detection memme The spring is loaded with a displacer weight suspended from a stainless steel cable As the floating roof rises the weight is lifted by the roof allowing the spring to compress the attraction sleeve to move upward into the field of the switch magnet and the switch to actuate As the roof low ers the weight again hangs free causing the spring to extend the sleeve to move downward and the switch to reset The displacers are usually fabricated from ductile metals such as brass to prevent sparking when the dis placer makes contact with the roof A spring is loaded with a weighted displacer which is heavier than the liquid Immersion of the displacers caused by rising liquid level imparts buoyancy forces on the dis placer allowing the spring to compress The attraction sleeve attached to the spring moves upward into the field of a permanent magnet The movement of the mag net
3. 2 Inspect switch mechanisms terminals and connec tions regularly Dry contacts switches should be inspected for exces sive wear on actuating lever or misalignment of adjust ment screw at point of contact between screw and lever Such conditions can cause false switch actuating levels Adjust switch mechanism to compensate if possible or replace switch DO NOT operate your control with defective or maladusted switch mechanisms Level controls may sometimes be exposed to excessive heat or moisture Under such conditions insulation on electrical wires may become brittle eventually breaking or peeling away The resulting bare wires can cause short circuits Check wiring carefully and replace at first sign of brittle insulation Vibration may sometimes cause terminal screws to work loose Check all terminal connections to be certain that screws are tight 4 Instruction amp installation manual AlarmScout A15 WHAT TO AVOID 1 NEVER leave switch housing cover of the control longer than necessary to make routine inspections 2 NEVER use lubricants on pivots of switch mechanisms A sufficient amount of lubricant has been applied at the factory to insure a lifetime of service Further oiling is unnecessary and will only tend to attract dust and dirt which can interfere with mechanism operation 3 NEVER attempt to make adjustments or replace switch es without reading instructions carefully Certain adjus
4. screw and shift magnet position Retighten magnet clamp screw 6 If switch magnet assembly swings freely and mecha nism still fails to actuate check installation of control to be certain it is within the specified three degrees of ver tical Use spirit level on side of enclosing tube in two places 90 apart 7 Check switch continuity with onmmeter RON NOTE As a matter of good practice spare switches should be kept on hand at all times If switch mechanism is operating satisfactorily proceed to check sensing unit Test control s performance 1 Reconnect power supply and carefully actuate switch mechanism manually using a non conductive tool on electrical switch mechanism to dertermine whether con trolled equipment will operate CAUTION With electrical power on care should be taken to avoid contact with switch leads and connec tions at terminal block 2 If controlled equipment responds to manual actuation test trouble may be located in level sensing portion of the control displacers spring stem and magnetic attracting sleeve NOTE Check first to be certain liquid is entering tank or vessel A valve may be closed or pipe line plugged 3 With liquid in tank or vessel proceed to check level sensing action by removing switch housing assembly CAUTION Be certain that electrical circuit s through control is deactivated Part No 4417903_Rev 0 Honeywell Enraf AlarmSc
5. toward the sleeve causes the switch to actuate A non magnetic barrier tube provides a static pressure boundary between the switch mechanism and the displac er assembly As the liquid level falls the displacer lowers causing the spring to extend and moving the attraction sleeve out of the magnetic field of the switch mechanism This allows the switch to again change position and to break or make Operating cycle Proof er control option The purpose of the Proof er is to check the operation of a displacer control without having to raise the level in the tank This is accomplished by pulling downward on the Proof er cable This causes the spring loaded lever arm to lift the switch actuator simulating a high or high high level condition When the cable is released the Proof er returns the actuator to its original position resuming normal opera tion MAINTENANCE Preventive mai ntenance aaa If the following sections on What to do and what to avoid are observed your level control will operate reliably WHAT TO DO 1 Keep control clean Be sure the switch housing cover is always in place on the control This cover is designed to keep dust and dirt from interfering with switch mechanism operation In addition it protects against damaging moisture and acts as a safety feature by keeping bare wires and terminals from being exposed Should the housing cover become damaged or misplaced order a replacement immediately
6. AlarmScout A15 Enraf Installation operation amp service manual AlarmScout A15 UNPACKING Top mounting displacer units are shipped from the factory with the displacer and cable assembly removed from the head assembly and packed separately in the same container If reshipping to another location displacer assembly must again be removed from the control to prevent damage snipes Unpack the instrument carefully Make sure all components have been removed part number from the foam protection Inspect all components for damage Report any con senaln cealed damage to the carrier within 24 hours Check the contents of the car ton crates against the packing slip and report any discrepancies to Honeywell Enraf Check the nameplate model number to be sure it agrees with the packing slip and purchase order Check and record the serial number for future reference when ordering parts These units are in compliance with 1 Directive 94 9 EC for equipment or protective system intended for use in potentially explosive atmos 0038 pheres EC type examination certificate number ISSePO9ATEX024X flameproof enclosure 0344 2 The PED Directive 97 23 EC pressure equipment directive Safety accessories per category IV mod ule H1 HANDLING The threaded connection link and stem protruding from the head assembly are extremely fragile DO NOT handle or place control in a position so that any amount of force is placed on the ste
7. after it is activated CAUSE REMEDY Defective return spring Replace spring Buildup between the shaft and housing Clean Proof er to remove buildup restricting movement Handle stops are not adjusted properly Adjust handle stop screws in or out to allow the handle to move to the proper position 2 Switch will not trip when Proof er is activated CAUSE REMEDY The switch mechanism Check switch mecha is defective and not the nism Proof er Handle stops are not adjusted properly Adjust handle stop screws in or out to allow the handle to move to the proper position Instruction amp installation manual 5 SPARE PARTS CAUTION DO NOT attempt to unscrew the cover of ATEX flameproof housings before loosening the locking screw ALWAYS retighten the locking screw after replacing the cover Replacing switch assembly CAUTION Before attempting to remove a switch mechanism be certain that electrical circuit s through control is deactivated Mounting screw Baffle plate screw Baffle plate screw Disconnect wiring from supply side of terminal block on switch mechanism Note and record lead wire terminal locations Loosen screw in split mounting clamp until mechanism slides freely on enclosing tube Remove small round head screw securing lower switch mechanism to baffle plate Slide switch mechanism off of enclosing tube If mecha nism
8. ers or weights and that there is a level surface on the roof beneath the displacer weight CAUTION Operation of all buoyancy type level devices should be done in such a way as to mini mize the action of dynamic forces on the float or displacer sensing element Good practice for reducing the likelihood of damage to the control is to equalize pressure across the device slowly 2 Instruction amp installation manual AlarmScout A15 Part No 4417903_Rev 0 Honeywell Enraf CAUTION Level controls are shipped from the factory with the enclosing tube tightened and the middle set screw on the housing base locked to the enclosing tube Failure to loosen the set screw prior to repositioning the cable entry may cause the enclosing tube to loosen resulting in the possible leakage of the process liquid or vapor Cover locking screw ATEX 7 flameproof only Screw Screw Set Screw CAUTION DO NOT attempt to unscrew the cover of ATEX flameproof housings before loosening the locking screw ALWAYS retighten the locking screw after replacing the cover Diagrams of internal electrical circuits SPDT Switch identification 1 Outside circuit Internal circuit Line Close on low level Common Close on high level NOTE 1 Rising level closes contacts 5 amp 6 2 Falling level closes contacts 4 amp 5 Part No 4417903_Rev 0 Honeywell Enraf Ala
9. is to be reused ensure that it is placed on a clean surface free of metallic particles that may be attracted to the switch magnet Loosen mounting screw so that switch frame will fit over e tube Install switch mechanism by sliding it over the enclosing tube Slide mechanism down until the bottom of the frame and terminal block are resting on the baffle plate The baffle plate should be resting on the hub of the housing base Install and tighten baffle plate screw so that the switch mechanism may not be separated from the baffle plate Tighten the mechanism mounting screw so that the mechanism is firmly clamped to the enclosing tube Swing magnet assembly in and out by hand checking carefully for any signs of binding Reattached supply side wiring to the terminal block and check switch function by varying liquid level in the ves sel 6 Instruction amp installation manual AlarmScout A15 Part No 4417903_Rev 0 Honeywell Enraf SPARE PARTS Spare parts ea Ee ee aed Digit in partn s e 7 e ae Lockwasher ground screw Baffle plate Locking screw for ATEX flameproof housing See nameplate always provide complete partn and r serial n when ordering spares 0 F Housing base Set a Set screw External grounding screw for ATEX housing OV
10. m Proper operation of the control requires that the stem is not damaged or bent Displacer spring and stem are fragile DO NOT drop displacers into tank Hand feed cable into position to avoid bending stem MOUNTING Adjust the displacer on the displacer cable for the desired switch actuating level instruction tag attached to cable Screw displacer cable fitting to threaded connection link protruding from the underside of control Be sure there are no tubes rods or other obstacles in the tank or vessel to interfere with the operation of the displac er No guides into the tank are necessary unless liquid tur bulence is excessive in which case a guided pipe or tube should be at least 25 mm larger than the displacer diame High level ter open at the bottom end and with several vent holes located above the maximum high level of the liquid Floating roof Check installation of pipe or tube to be certain it is plumb CAUTION Before attaching the control to tank or vessel using a level check to see that tank mounting flange is within 3 of horizontal in all directions Proper operation of the control depends on the switch housing being plumb For floating roof top applications the displacer switch may be mounted via flange or threaded mounting on a bracket catwalk etc or through an opening in an outer dome roof Ensure that there are no obstacles to interfere with the operation of the displac
11. out A15 a Disconnect wiring from supply side of switch mecha nism s and remove electrical conduit or operating medium line connections to switch housing b Relieve pressure from tank or vessel and allow unit to cool c Remove switch housing assembly by loosening set screws located at the bottom of the housing base 4 With switch housing assembly removed inspect attrac tion sleeve and inside of enclosing tube for excessive corrosion or solids buildup which could restrict move ment preventing sleeve from reaching field of switch magnet 5 Inspect displacer stem and spring assembly to assure it is not damaged If stem or spring is bent or otherwise damaged movement of the attraction sleeve inside the e tube will be restricted preventing proper function of the control 6 If trouble is still not located proceed to remove the entire sensing unit from the tank or vessel by unbolting head flange or unscrewing mounting bushing Inspect dis placer assembly and all internal parts for any signs of damage Check assembly for binding by supporting head flange or mounting bushing over the edge of a bench and move displacer assembly by hand NOTE When in doubt about the condition or performance of a control contact the factory or consult your local repre sentative Proof er If the Proof er is not functioning properly listed below are potential problems and corrective action 1 Proof er does not return to the down position
12. rmScout A15 The switch housing is designed to provide 360 positioning of cable entry by loosening the set screw s located under the housing base On high temperature applications above 120 C 250 F high temperature wire should be used between control and first junction box located in a cooler area Supply wires conductors are brought into the switch housing wrapped around the enclosing tube under the baffle plate and then brought up to the proper terminals Excess wire should be positioned so as not to interfere with switch mechanism or housing cover Some controls are furnished with an explosion proof cast switch housing or a vapor tight gasketed type These hous ings are used in hazardous locations or when liquid temper ature is so low that excessive condensation and frosting of switch parts is likely After wiring connections have been completed explosion proof housings must be sealed at the cable entry with suitable compound or dope to prevent entrance of air Check cover to base fit on explosion proof and vapor tight housings to be certain gasketed joint is tight A positive seal is necessary to prevent infiltration of moisture laden air or corrosive gases into switch housing Connect power supply to control and test switch action by varying liquid level If switch mechanism fails to function check vertical alignment of control DPDT Internal circuit right switch Internal circuit left switch
13. t ments provided for in level controls should not be attempted in the field When in doubt consult the facto ry or your local representative 4 NEVER attempt to readjust magnetic attraction sleeves which are factory set Tampering may cause failure of control while in service even though manual operation actuates switches Part No 4417903_Rev 0 Honeywell Enraf MAINTENANCE Troubleshooting SSeS SSS See Usually the first indication of improper operation is failure of the controlled equipment to function i e pump will not start or stop signal lamps fail to light etc When these symp toms occur whether at time of installation or during routine service thereafter check the following potential external causes first Fuses may be blown Reset button s may need resetting Power switch may be open Controlled equipment may be faulty Wiring leading to control may be defective If a thorough inspection of these possible conditions fails to locate the trouble proceed next to a check of the control s switch mechanism Check switch mechanism Disconnect power to the level control Remove switch housing cover Disconnect power wiring from switch assembly Swing magnet assembly in and out by hand to check carefully for any sign of binding Assembly should require minimal force to move it through its full swing 5 If binding exists magnet may be rubbing enclosing tube If magnet is rubbing loosen magnet clamp
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