Emerson L2 Instruction Manual
Contents
1. ees dh ands wees qs ED 11 Par KIES orire ar aere ae ces 14 Assembly EN Mares 13 PANES WIS LETTER 14 Replacing the Controller Relay 13 ie ii 14 Replacing the Controller Supply Filter 13 SA sd aed tede t eue tent E 16 Introduction Scope of Manual This instruction manual includes installation adjustment maintenance and parts ordering information for the Fisher L2 liquid level controller Do not install operate or maintain an L2 Liquid Level Controller without being fully trained and qualified in valve actuator and accessory installation operation and maintenance To avoid personal injury or property damage it is important to carefully read understand and follow all contents of this manual including all safety cautions and warnings If you have any questions about these instructions contact your Emerson Process Management sales office before proceeding es EMERSON www Fisher com Process Management L2 Controller September 2013 Table 1 Specifications Available Configurations Controller Snap acting or throttling Sensor Displacer type liquid level sensor for mounting to side of tank Displacer travel is transmitted to controller by pivotal movement of displacer rod Input Signal Type Liquid level or liquid to liquid interface Level Change Required for Full Change in Output Signal in 1 0 Specific Gravity Liquid with 1 4 Bar 202. 55 Nameplate 56 Screen stainless steel Key 57 60 61 62 84 85 Instruction Manual D103032X012 Description Part Number Hex Nut stainless steel Anti seize sealant not furnished with controller Lubricant silicone sealant not furnished with controller Thread locking adhesive medium strength not furnished with controller Adhesive industrial grade cyanoacrylate Nameplate ATEX Sensor 81 63 64 65 66 67 68 70 71 72 73 74 75 76 77 78 79 80 82 Displacer 1 7 8x12 inches PVC 12B2936X032 S31603 SST 12B2956X032 Hex Nut 316 SST Displacer Rod 17 4 SST 17 4PH SST Sensor Connection Spacer 304 SST Hex Nut 316 SST Conical Spring 316 SST Universal Joint 316 SST vertical displacer only Nameplate Drive Screw stainless steel Pivot Body CB7CU 1 17 4PH SST Pivot Base CF8M 316 SST 3 fluorocarbon Anti Extrusion Ring 3 PTFE Retaining Ring 304 SST 3 fluorocarbon Backup Ring 3 fluorocarbon Lithium grease not furnished with sensor Instruction Tag Extension 531600 12B2953X022 Recommended spare parts 1 Included in Controller Repair Kit 2 Included in Relay Repair Kit 3 Included in Sensor Repair Kit Neither Emerson Emerson Process Management nor any of their affiliated entities assumes responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any produ
3. If installing this into an existing application also refer to the WARNING at the beginning of the Maintenance section of this instruction manual CAUTION If the L2 level controller is installed on a vessel that is to be shipped to a different location e g skid mounted units remove the displacer and displacer rod extensions before shipment Failure to do so could result in damage to the displacer rod due to vibration and impact loading during shipment After the vessel is installed at its final location reassemble the displacer and displacer rod extension 1 Be sure there are no obstructions inside the tank that will interfere with displacer installation or operation 2 Provide the appropriate connection in the tank wall to match the sensor connection Locate the tank wall connection such that the displacer will be at the desired control level Attaching a Vertical Displacer Refer to figure 7 for part locations 1 Thread jam nut key 68 all the way onto the threaded portion of the universal joint assembly key 69 2 Thread the displacer key 81 all the way onto the threaded portion of the universal joint assembly 3 Tighten the jam nut key 63 against the displacer key 81 Attaching a Horizontal Displacer Refer to figure 7 for part locations 1 Thread the displacer key 81 all the way onto the displacer rod key 64 or extension key 82 2 Tighten the jam nut key 63 against the displacer key 81 Instruction Manual
4. or 31 to 34 psig for a 6 to 30 psig output range Direct Acting On Off and Snap Acting Controllers 1 Make certain the Preliminary Checks procedure at the start of this section has been completed 2 Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the displacer For interface applications completely cover the displacer with the fluid with the lower specific gravity The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the displacer 3 Adjust the spring adjustment key 4 until the output pressure is at full supply pressure 4 Readjust the spring adjustment key 4 until the output pressure goes to zero psig Reverse Acting On Off and Snap Acting Controllers 1 Make certain the Preliminary Checks procedure at the start of this section has been completed 2 Lowerthe liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the displacer For interface applications completely cover the displacer with the fluid with the lower specific gravity The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the displacer 3 Adjust the spring adjustment key 4 until the output pressure goes to zero psig 4 Readjust the spring adjustment key 4 until the output pressure goes to full supply pressure L2 Controller Instruction Manual S
5. zero or equal to the supply pressure over the range of liquid level change The liquid level change required to fully operate the relay is adjusted by sliding the proportional band adjustment along lever A to vary the lever ratio between levers A and B With reverse acting proportional control the principle of operation remains the same as that for direct action however the controller delivers an increasing pneumatic signal to the control valve when the liquid level falls Instruction Manual L2 Controller D103032X012 September 2013 Maintenance Parts are subject to normal wear and must be inspected periodically and replaced as necessary The frequency of parts inspection and replacement depends upon the severity of service conditions When inspection or repairs are required disassemble only those parts necessary to accomplish the task A WARNING Always wear protective clothing gloves and eyewear when performing any maintenance operations to avoid personal injury To avoid personal injury or property damage caused by the release of pressure or process fluid observe the following before starting maintenance Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and appropriate preventive measures are not taken Preventive measures may include but are not limited to one or more of the following Remote venting of the unit re evaluating the hazardous area classification ens
6. Instruction Manual L2 Controller D103032X012 September 2013 Fisher L2 Liquid Level Controller Contents Figure 1 Fisher L2 Liquid Level Controller In EFOGILICEIOT Stave eh 1 Scope of Man al 1 DeSCrIDHION kee 3 Specifications 3 Education Services 3 SEAN ATION vs 4 Attaching Vertical Displacer 4 Attaching Horizontal Displacer 4 Attaching the Sensor to the Vessel 5 Pressure Connections 5 VON G LS LUE 6 Changing Controller Action or Mode 6 Throttling and On Off Controllers 6 Snap Acting Controller 6 Seed erae ag ub cR SO RSEN 8 Preliminary 8 Direct Acting Throttling Controllers 9 Reverse Acting Throttling Controllers 9 Direct Acting On Off and Snap Acting Controllers 9 Reverse Acting On Off and Snap Acting Controllers 9 W8418 1 Principle of Operation 10 Walhlenance sacs tat eta eh a dee EVA 11 Removing the Controller From the Sensor 11 Related Documents 14 Replacing the Sensor 5 11 Parts Ordering suc usto acies an ee v tan ee 14 Disassembly s
7. L2 Controller D103032X012 September 2013 Attaching the Sensor to the Vessel Insert the displacer end of the controller sensor assembly into the tank connection and screw the sensor threads into the tank connection Tighten sufficiently to seal the threads If necessary loosen or tighten slightly to obtain the orientation shown in figure 2 Make sure that the controller case is level CAUTION Do not pick up the controller sensor by lifting the displacer rod key 64 This action could place excessive stress on the displacer rod and cause the unit to malfunction Figure 2 Sensor Orientation NS CORRECT CONTROLLER MOUNTING HOLE ORIENTATION WHEN MOUNTED ON VESSEL A6639 Pressure Connections A WARNING Personal injury or property damage may occur from an uncontrolled process if the supply medium is not clean dry oil free air or non corrosive gas While use and regular maintenance of a filter that removes particles larger than 40 micrometers in diameter will suffice in most applications check with an Emerson Process Management field office and industry instrument air quality standards for use with corrosive air or if you are unsure about the proper amount or method of air filtration or filter maintenance 1 Provide a source of clean dry air that meets the requirements of ISA Standard 7 0 01 as the operating medium Refer to table 1 to determine supply pressure 2 Connect the supply pressure to the 1 4 NPT internal connec
8. N REVERSE ACTION NOTE 1 gt ALLFOUR SWITCH RETENTION SCREWS SHOWN ONLY ON THIS VIEW OTHER VIEWS SHOW ONLY TWO SWITCH RETENTION SCREWS IN ORDER TO ILLUSTRATE THE SWITCH CONFIGURATION L2 Controller Instruction Manual September 2013 D103032X012 Span Adjustment Except where indicated key numbers referenced in the following procedures are shown in figure 8 The span levers and other proportional band information are shown in figure 5 Figure 5 Proportional Band Adjustments SPAN LEVER GAP MAXIMUM SPAN LEAST SENSITIVE POSITION FOR MINIMUM SPAN MOST SENSITIVE POSITION THROTTLING AND ON OFF CONTROLLER MINIMUM SPAN FOR THROTTLING AND ON OFF CONTROLLER MOST SENSITIVE POSITION FOR SNAP ACTING MAXIMUM SPAN LEAST SENSITIVE POSITION CONTROLLER FOR SNAP ACTING CONTROLLER LEVER A CONTACTING THE DISPLACER ROD GB0137 2 E0787 Preliminary Checks 1 Checkthe supply pressure gauge key 10 to be certain that the supply pressure is at the desired value Adjust the supply pressure as required 2 Adjust the displacer rod to the horizontal position with the spring adjustment key 4 3 Bounce the end of the displacer rod key 64 figure 7 up and down to check that the sensor is operating freely 4 Place the span adjuster key 9 at the desired position see figure 5 Instruction Manual L2 Controller D103032X012 September 2013 5 Check figures 3 and 4 for correct control action and control mode 6 Adjust the relay adjus
9. Psig Supply Pressure Direct Action and Standard 48 x 305 mm 1 7 8 X 12 Inch Vertical Displacer with Standard Lever Arm Length Control Minimum Proportional Maximum Proportional Mode Band Level Change mm Band Level Change mm Inches 1 Inches Throttling 102 4 305 1 5 1 2 305 12 305 2008 Minimum Specific Gravity 2 Throttling and On Off Controllers Minimum specific gravity or specific gravity differential for interface applications is 0 1 see footnote 3 Snap Acting Controllers Minimum specific gravity or specific gravity differential for interface applications is 0 1 Output Signal Pneumatic on off or proportional pressure signal Ranges Throttling 0 2 to 1 0 bar 3 to 15 psig 0 4 to 2 0 bar 6 to 30 psig On Off 0 off or full supply pressure on Action Field reversible between direct increasing level increases output signal and reverse increasing level decreases output signal Supply Pressure Requirements Throttling and On Off Controller Throttling 1 4 bar for 0 2 to 1 0 bar output signal 20 psig for 3 to 15 psig output signal and 2 4 bar for 0 4 to 2 0 bar output signal 35 psig for 6 to 30 psig output signal On Off Any desired pressure between 1 4 and 3 4 bar 20 and 50 psig Snap Acting Controller Any desired pressure Continued Instruction Manual D103032X012 between 1 4 and 5 2 bar 20 and 50 psig direct and 1 4 bar and 2 4
10. bar 20 and 35 psig reverse Do not use supply pressure below 1 4 bar 20 psig Supply Medium Air or natural gas 4 Steady State Air Consumption 5 Throttling Controller lt 0 03 normal m hr 1 0 scfh at 1 4 bar 20 psig supply pressure Snap Acting Controller lt 0 03 normal m hr 1 0 scth at 1 4 bar 20 psig supply pressure or lt 0 04 normal m hr 1 5 scfh at 2 4 bar 35 psig supply pressure in tripped condition air consumption increases during trip Sensor to Vessel Connection 2 NPT threaded or NPS 2 CL 150 through 1500 slip on flange connection 9 Controller Connections Supply 1 4 NPT internal located on the bottom of the case Output 1 4 NPT internal located on the top of the case Case Vent 1 4 NPT internal with vent screen assembly located on the back of the case Standard Displacer Size 48 x 305 mm 541 cm 1 7 8 x 12 inches 33 in Maximum Displacer Insertion Length Standard lever arm length plus one 6 inch extension horizontal or vertical Displacer Material and Maximum Sensor Working 8 PVC Displacer Consistent with CL1500 pressure temperature ratings per ASME B16 34 up to maximum pressure of 258 bar 3750 psig For PED 97 23 EC maximum pressure limited to 200 bar 2900 psig 531603 SST Displacer CL600 pressure temperature ratings per ASME B16 34 up to maximum pressure of 99 3 bar 1440 psig Note For slip on flange connection maximum sensor worki
11. ct remains solely with the purchaser and end user Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co Emerson Process Management Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co All other marks are the property of their respective owners The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or their use or applicability All sales are governed by our terms and conditions which are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice Emerson Process Management Marshalltown lowa 50158 USA Sorocaba 18087 Brazil Chatham Kent ME4 4QZ UK Dubai United Arab Emirates Singapore 128461 Singapore www Fisher com 2001 2013 Fisher Controls International LLC All rights reserved n n n ij VWiananamnanr FIULUC55
12. ction of a throttling and on off controller may be changed between either direct or reverse and the control mode may be changed between either on off or throttling Refer to figure 3 Loosen the four switch retention screws on the relay Move the switches to the control action and control mode required by the application Tighten the four switch retention screws Snap Acting Controller The action of a snap acting controller may be changed between either direct or reverse The control mode is always Snap acting Refer to figure 4 Loosen the four switch retention screws on the relay Move the switches to the control action required by the application Tighten the four switch retention screws Instruction Manual L2 Controller D103032X012 September 2013 Figure 3 Fisher L2 Throttling and On Off Controller Switch Positions for Changing Action and Control Mode SWITCH RETENTION SCREWS lt 1 SWITCH RETENTION SCREWS lt T DIRECT ACTION THROTTLING DIRECT ACTION ON OFF CONTROL MODE CONTROL MODE REVERSE ACTION THROTTLING REVERSE ACTION ON OFF CONTROL MODE CONTROL MODE NOTE L1 gt FOUR SWITCH RETENTION SCREWS SHOWN ONLY ON THIS VIEW OTHER VIEWS SHOW ONLY TWO SWITCH RETENTION SCREWS IN ORDER TO ILLUSTRATE THE SWITCH CONFIGURATION B2339 Figure 4 Fisher L2 Snap Acting Controller Switch Positions for Changing Action SWITCH RETENTION SCREWS lt 1 SWITCH RETENTION SCREWS lt T B2340 DIRECT ACTIO
13. eptember 2013 D103032X012 Principle of Operation The operation of L2 controllers in combination with the sensor is based on Archimedes Principle which states that a body immersed in a liquid will be buoyed up by a force equal to the weight of the liquid displaced The buoyant force and resultant movement of the displacer in the liquid is transmitted to the controller which delivers a pneumatic signal to a control valve Figure 6 shows a simple schematic of the controller and sensor In its normal position the counterclockwise moment due to the weight of the displacer about pivot point O is balanced by the clockwise zero spring moment and the counterclockwise relay zero force moment applied through lever A to the displacer rod The weight of the displacer decreases when the liquid level increases and the subsequent buoyant force increases causing a force imbalance between the zero spring relay and displacer forces This force imbalance is transmitted to the relay by levers A and B The relay compensates for the force imbalance by converting it to a pressure output to a control valve and bringing the forces back into equilibrium Figure 6 Operational Schematic LEVER B DISPLACER ROD PROPORTIONAL BAND ADJUSTMENT PIVOT D POINT O LEVER A ZERO SPRING DISPLACER A5592 For throttling control the relay pressure output will be proportional to the buoyant force For on off control the relay pressure output will be either
14. equipment always mention the serial number of the controller The serial number can be found on the nameplate key 55 figure 8 When ordering replacement parts also specify the complete 11 character part number of each part required as found in the following parts list A WARNING Use only genuine Fisher replacement parts Components that are not supplied by Emerson Process Management should not under any circumstances be used in any Fisher instrument Use of components not supplied by Emerson Process Management may void your warranty might adversely affect the performance of the valve and could cause personal injury or property damage Parts Kits Parts List Description Part Number Note Controller For part numbers not shown contact your Emerson Process Repair kit includes O rings keys 13 and 16 and Management sales office gaskets keys 18 21 and 23 RL2CNTRX012 Relay Repair kits includes relay assembly relay mounting screws key 33 and O rings keys 43 and 44 Control ler Throttling and On Off Controller GB0138X0012 Key Description Snap Acting Controller GB0138X0022 Controller Base marine grade aluminum Sensor Zero Spring Seat 316 SST Zero Adjustment Bolt stainless steel Spring Adjustment 316 SST Zero Spring 17 7PH SST Repair kit includes keys 74 75 77 and 78 fluorocarbon O rings anti extrusion ring and fluorocarbon backup ring RL2SENSX012 Instruction Manual L2 Controller D103032X012 Sep
15. he hex nut key 67 to permit removing the displacer rod pivot base pivot body and spacer from the sensor connection L2 Controller Instruction Manual D103032X012 September 2013 4 Slide the pivot base key 73 retaining ring key 76 anti extrusion ring key 75 and O ring key 74 off the displacer rod Remove the O ring key 77 and backup ring key 78 from the pivot base Figure 7 Sensor Ww i S 1 V2 O SECTIONA A C APPLY LUB SEALANT GB0139 C sht 1 Instruction Manual L2 Controller D103032X012 September 2013 Assembly A WARNING Improper assembly of the O rings anti extrusion ring and backup ring could result in O ring extrusion and permit leakage of process fluids To avoid personal injury or property damage from leaking process fluid be sure the O rings anti extrusion ring and backup ring are assembled in the order shown in figure 7 1 Place the pivot body key 72 on the displacer rod key 64 so that it is positioned as shown in figure 7 2 Slide the O ring key 74 anti extrusion ring key 75 and retaining ring key 76 onto the displacer rod assembly key 64 Be sure the O ring anti extrusion ring and retaining ring are in the order shown in figure 7 Slide the pivot base onto the displacer rod so that the points of the pivot body key 72 will engage the slots in the pivot base key 73 3 Install the O ring key 77 and backup ring key 78 into the groove on the
16. isted in table 1 Educational Services For information on available courses for L2 Liquid Level Controllers as well as a variety of other products contact Emerson Process Management Educational Services Registration P O Box 190 301 S 1st Ave Marshalltown IA 50158 2823 Phone 800 338 8158 or Phone 641 754 3771 FAX 641 754 3431 e mail education emerson com L2 Controller Instruction Manual September 2013 D103032X012 Installation A WARNING Always wear protective clothing gloves and eyewear when performing any installation operations to avoid personal injury To avoid personal injury or property damage caused by the sudden release of process fluid be certain the service conditions do not exceed the sensor pressure limits Use pressure limiting or pressure relieving devices to prevent service conditions from exceeding these limits Personal injury or property damage may result from fire or explosion if natural gas is used as the supply medium and appropriate preventive measures are not taken Preventive measures may include but are not limited to one or more of the following Remote venting of the unit re evaluating the hazardous area classification ensuring adequate ventilation and the removal of any ignition sources For information on remote venting of this controller refer to page 6 Check with your process or safety engineer for any additional measures that must be taken to protect against process media
17. ng pressure must be consistent with the flange ratings Instruction Manual L2 Controller D103032X012 September 2013 Table 1 Specifications continued Displacer Material and Sensor Temperature Hazardous Area Classification 8 Limits Complies with the requirements of ATEX Group II PVC Displacer 29 to 79 C 20 to 175 F Category 2 Gas and Dust 531603 SST Displacer 40 to 204 C 40 to 400 F CE amp 12GD D Declaration of SEP Fisher Controls International LLC declares this Controller 29 to 71 C 20 to 160 F product to be in compliance with Article 3 paragraph of the Pressure Equipment Directive PED 97 23 EC It was designed and manufactured in accordance with Sound Engineering Practice SEP and cannot Standard Supply and Output Pressure Gauge bear the CE marking related to PED compliance Indications However the product may bear the CE marking to Triple scale gauges in 0 to 60 psig O to 0 4 MPa 0 to indicate compliance with other applicable European 4 0 bar Community Directives NOTE Specialized instrument terms are defined in ISA Standard 51 1 Process Instrument Terminology TAn A ton from the standard construction described in the input signal specification above requires special displacer sizing considerations Contact your Emerson Process Management sales office for information 2 Depends on float rod displacer orientation and length Contact your Emerson Process Manageme
18. nt sales office for further information 3 Minimum specific gravity differential with standard displacer is 0 4 Minimum specific gravity differential of 0 1 is possible with special displacer consult your Emerson Process Management sales office for displacer sizing information 4 This product can be used with natural gas as the supply medium Natural gas should contain no more than 20 ppm of H2S 5 Normal m3 hr Normal cubic meters per hour 0 C and 1 01325 bar absolute Scfh Standard cubic feet per hour 60 F and 14 7 psia 6 Converting from a threaded NPT connection to a flange connection is to be done by the end user Refer to Converting a Threaded NPT Connection to a Flange Connection instruction Manual Supplement D103277X012 available at www Fisher com or from your Emerson Process Management sales office 7 Standard lever arm length 8 The pressure and temperature limits in this document and any applicable code limitations should not be exceeded Description The rugged L2 liquid level controllers use a displacer type sensor see figure 1 to detect liquid level or the interface of two liquids of different specific gravities These controllers use a single four mode relay to provide the applicable control and action The device delivers a pneumatic output signal to a control dump valve Unless otherwise noted all NACE references to NACE MRO175 2002 Specifications Specifications for the controller and sensor are l
19. ounting bosses before installing the relay Make certain span lever B see figure 5 is in line with and pushing in on the end of either the relay adjustment screw key 49 throttling controller or the pilot valve plug of the valve assembly key 51 snap acting controller Replacing the Controller Supply Filter Refer to figure 8 for key number locations unless otherwise indicated 1 Disconnect the supply and output pressure lines 2 Loosen the filter cap screws key 17 and rotate the filter cap key 14 to the side to uncover the supply filter key 15 3 Remove the old filter key 15 and remove any debris from the filter boss 4 Install a new supply filter Reinstall the filter cap key 14 and tighten the filter cap screws key 17 L2 Controller Instruction Manual September 2013 D103032X012 Related Documents e Converting a Threaded NPT Connection to a Flange Connection Supplement to Fisher L2 L2sj Liquid Level Controller Instruction Manuals D103277X012 e Dimensions for NPS 2 CL150 through 1500 Slip On Flange Connections Supplement to Fisher L2 and 125 Liquid Level Controller Instruction Manuals D103405X01 2 e Fisher L2sj Low Emission Liquid Level Controller Instruction Manual D103216X012 All documents are available from your Emerson Process Management sales office Also visit our website at www Fisher com Parts Ordering When corresponding with your Emerson Process Management sales office about this
20. pivot base key 73 Be sure the backup ring is on the downstream pressure side of the O ring as shown in figure 7 4 Insert the displacer rod key 64 into the vessel side of the sensor connection key 65 5 The pivot base must seat in the slots cast in the sensor connection These slots will be horizontal when the sensor connection key 65 is oriented as shown in figure 2 6 To reduce the possibility of nicking the O ring key 77 on the pivot base keep the displacer rod centered in the sensor connection as much as possible while pushing the pivot base into the sensor connection Be sure the pivot base seats in the slots cast in the sensor connection 7 Slide the spring key 68 and spacer key 66 onto the displacer rod and secure with the hex nut key 67 Fully tighten the hex nut key 67 8 View the sensor connection from the vessel side Ensure that the pivot body arms remain aligned with the pivot base arms the two pivot body points are seated in the pivot base slots 9 Install the sensor on the tank Replacing the Controller Relay Refer to figure 8 for key number locations unless otherwise indicated 1 Disconnect the supply and output pressure lines 2 Remove the two relay mounting screws key 33 and pull the relay away from the controller base key 1 3 Install the new relay using two relay mounting screws key 33 Make certain that the relay mounting O rings keys 43 and 44 not shown are completely in their m
21. tember 2013 Figure 8 Fisher L2 Liquid Level Controllers 53 20 9 12 9 G9 85 8 6 0 60 27 22 184 03 64 CO CO G9 THROTTLING AND ON OFF ee a AP CONTROLLER RELAY ASSY 4d 7 1 AT WX 7 ENS lt 8 0 G2 2 49 THROTTLING AND ON OFF CONTROLLER SNAP ACTING CONTROLLER RELAY ASSEMBLY VIEW SNAP ACTING CONTROLLER APPLY LUB SEALANT L2 Controller September 2013 Key Description Part Number 6 Span Lever Assembly stainless steel 7 Shoulder Screw stainless steel 2 req d 8 Flanged Bearing nylon 4 req d 9 Span Adjustor stainless steel 10 Pressure Gauge 2 req d 11 Mounting Screw stainless steel 4 req d 12 Cover Screw stainless steel 13 O Ring nitrile 14 Filter Cap reinforced PMMA polymethylmethacrylate 15 Filter 11B2307X012 16 O Ring nitrile 17 Machine Screw stainless steel 2 req d 18 Sensor Gasket composition 19 Cover marine grade aluminum 20 Cover Lens PMMA polymethylmethacrylate 2 req d 21 Gasket chloroprene 2 req d 22 Retaining Ring steel 2 req d 23 Cover Gasket nitrile 33 Relay Mounting Screw 2 stainless steel 2 req d 43 Relay Mounting O Ring 2 nitrile not shown 44 Relay Mounting O Ring 2 nitrile not shown 49 Relay Adjustment Screw 51 Valve Assembly 52 Valve Assembly O Ring 53 Label setup and calibration 54 Self Tapping Screw stainless steel 2 req d
22. tion on the bottom of the controller case 3 Connect the output signal line to the equipment being operated and to the 1 4 NPT output connection on the top of the controller case L2 Controller Instruction Manual September 2013 D103032X012 Vent A WARNING If a flammable or hazardous gas is to be used as the supply pressure medium personal injury or property damage could result from fire or explosion of accumulated gas or from contact with hazardous gas The controller actuator assembly does not form a gas tight seal and when the assembly is enclosed a remote vent line adequate ventilation and necessary safety measures should be used However a remote vent pipe alone cannot be relied upon to remove all hazardous gas Vent line piping should comply with local and regional codes and should be as short as possible with adequate inside diameter and few bends to reduce case pressure buildup The vent opening or the end of the remote vent pipe if one is required must be protected against the entrance of all foreign matter that could plug the vent Use 13 mm 1 2 inch diameter pipe for the remote vent pipe Check the vent periodically to be certain it is free of any obstructions Changing Controller Action or Mode To avoid personal injury caused by a sudden release of pressure shut off the supply pressure and bleed pressure from the supply lines before performing any procedure in this section Throttling and On Off Controller The a
23. tment screw key 49 throttling controller or the valve assembly key 51 snap acting controller so that the gap between the span levers see figure 5 is equal when lever A is contacting the displacer rod Direct Acting Throttling Controllers 1 Make certain the Preliminary Checks procedure at the start of this section has been completed 2 Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the displacer For interface applications completely cover the displacer with the fluid with the lower specific gravity The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the displacer 3 Adjust the spring adjustment key 4 until the output pressure is 1 to 2 psig for a to 15 psig output range or 2 to 4 psig for a 6 to 30 psig output range Reverse Acting Throttling Controllers 1 Make certain the Preliminary Checks procedure at the start of this section has been completed 2 Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the displacer For interface applications completely cover the displacer with the fluid with the lower specific gravity The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the displacer 3 Adjust the spring adjustment key 4 until the output is 16 to 17 psig for a 3 to 15 psig output range
24. uring adequate ventilation and the removal of any ignition sources For information on remote venting of this controller refer to page 6 Provide some temporary means of control for the process before taking the controller out of service Provide a means of containing the process fluid before removing any measurement devices from the process Vent any trapped process pressure Check with your process or safety engineer for any additional measures that must be taken to protect against process media Removing the Controller From the Sensor 1 Disconnect the supply and output pressure lines 2 Slide the hook end of the zero spring key 5 figure 8 over and off the controller end of the displacer rod key 64 figure 7 3 Remove the four controller mounting screws key 11 figure 8 and pull the controller straight away from the sensor Replacing the Sensor O Rings Refer to figure 7 for key number locations unless otherwise indicated Disassembly 1 Remove the controller from the sensor by following the procedure outlined in the previous section 2 Remove the sensor from the tank 3 Unscrew the hex nut key 67 and remove the spacer key 66 and spring key 68 After removing the spring replace the spacer key 66 and hex nut key 67 on the displacer rod From the displacer end pull the displacer rod away from the sensor connection key 65 to pull the pivot base key 73 loose from the sensor connection Remove t
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