Series A, B, C, D, E, F, L, N, O, Q, S, T, U, W, X, 2 & 3 ® Electric switch mechanisms INSTRUCTION MANUAL AND PARTS LIST Magnetrol level controls are available with a range of different switch mechanisms - each designed for specific service conditions. A brief description of the individual switch mechanisms and their applications are given below. MERCURY SWITCHES Series A, E, L, N & T Mercury switches offer the advantage of quick visual inspection of contact conditions. A = switches are heavy duty units with high load carrying capability. E = switches are specially designed to provide greater vibration resistance. L = switches are used only in model B40 units. N = switches are used only in model C10 and C15 units. T = switches are used only in C15 units. Series A, E, N & T Mercury switch Series 2 & 3 High temperature mercury switch Series B, C & D Dry contact switches Series F Hermetically sealed switch HIGH TEMPERATURE MERCURY SWITCHES Series 2 & 3 These switches offer the advantage of quick visual inspection of contact conditions and feature nickel/copper bare wire and ceramic beaded insulation, allowing use in applications where the process temperature does not exceed 400°C (750°F). 2 = switches are specially designed to provide greater vibration resistance. 3 = switches are heavy duty units with high load carrying capability. DRY CONTACT SWITCHES Series B, C, D, O, U, Q & S Dry contact switches are specified in applications where mercury must be avoided – such as in nuclear power plant installations. B = switches are general purpose units with a maximum liquid temperature rating of 290°C (550°F). C = switches are general purpose units with a maximum liquid temperature rating of 230°C (450°F). D = switches are designed for DC current applications. O = switches are used only in model C10 and C15 units. Q = switches are used only in C15 units. S = switches are used only in model B40 units. U = switches are dry contact snap switches with gold alloy contacts and suitable for a maximum liquid temperature of 120°C (250°F). Series W & X Hermetically sealed switch HERMETICALLY SEALED SWITCHES Series F, W & X Hermetically sealed switches are for use in special applications where hermetically sealed contacts are required. F = switches are well suited for use where the process temperature does not exceed 400°C (750°F). W = switches have silver plated contacts with a maximum liquid temperature rating of 230°C (450°F). X = switches have gold plated contacts and suitable for a maximum liquid temperature of 230°C (450°F). Series L Mercury switch Series S Snap switch GENERAL INSTRUCTIONS OPERATING PRINCIPLE OPERATING CYCLE Diagrams A and B illustrate the simple and foolproof Magnetrol operating principle. Switching action is obtained through the use of a magnetic sleeve ➃ actuated by a float ➂, displacer or flow sensing device and a switching mechanism ➁. These two basic component assemblies are separated by a non-magnetic, pressure tight enclosing tube ➄. A switch mechanism ➁ and magnet ➀ are assembled to a swinging arm which operates on precision stainless steel pivot sockets. At Normal Operating Level of a liquid in a storage vessel, (diagram A), the float moves the magnetic sleeve upward in the enclosing tube and into the field of the switch mechanism magnet. As a result, the magnet is drawn in tightly to the enclosing tube causing the switch to tilt, making or breaking the electrical circuit. As the liquid level recedes, the float pulls the magnetic sleeve downward until, at a predetermined Low Level, (diagram B) the switch magnet releases and is drawn outward away from the enclosing tube by a tension spring. This in turn tilts the switch in an opposite direction, thus reversing switch action. When the liquid level returns to normal, the float once again moves the magnetic sleeve up the enclosing tube, causing the switch to assume its original position. 2 Pivot 5 Return Spring 4 1 3 Switch mechanisms may include a single switch or multiple switches depending on operational requirements and switching action desired. Rising level Diagram A Falling level Diagram B INSTALLATION REMOVING SWITCH MECHANISM REPLACING MERCURY SWITCH Series A, L, N & 3 CAUTION: Before attempting to remove a switch mechanism, be certain to pull, disconnect switch or otherwise assure that electrical circuit through control is de-energized. 1. Disconnect wiring from supply side of terminal block on switch mechanism. Note and record lead wire terminal locations. 1. Disconnect Magnetrol control from power supply. 2. Disconnect switch leads from terminal block A, noting terminal post numbers marked on switch mechanism. NOTE: Before removing existing mercury switch, loosen cement, holding switch, by gently prying between switch clips and glass tube. 2. Loosen screw in split mounting clamp until mechanism slides freely on enclosing tube, see Figure 1. 3. Remove small round head screw, securing lower switch mechanism to baffle plate, see Figure 7 on page 6. 4. Carefully lift off switch mechanism and place on clean surface, free of metal particles which may be attracted to switch magnet. Figure 2 3. Remove mercury switch from clips B, Figure 3. 4. Replace new mercury switch into clips B, making certain that switch legs are positioned to help fouling of leads. 5. Glue switch to clips B using a cement such as DuPont Duco, Goodyear Pliobond, Shellac or equivalent, see Figures 2 and 3. 6. Connect switch leads to terminal block A on identical post positions as those in the original assembly. Figure 3. Figure 1 2 Figure 3 INSTALLATION cont. REPLACING MERCURY SWITCH CONT. Series A, L, N & 3 cont. REPLACING MERCURY SWITCH CONT. Series E, T & 2 cont. 7. Check to be certain that switch leads do NOT cross over or under one another. NOTE: A properly adjusted mercury switch will have equal overtravel tilt in both directions after switch actuation. 8. Swing magnet assembly in and out by hand, checking carefully for any sign of binding. Assembly should require minimum force to move through its full swing. Contact factory if binding is observed. 5. DPDT switch mechanisms have two mercury switches carried by the pivoted magnet (See Figure 4). Follow all steps for switch replacement and adjustment described in steps 1 through 4. NOTE: DPDT mechanisms have left hand and right hand switches (see Fig. 4) (as viewed facing terminal block of mechanism). Follow all steps for switch replacement and adjustment described above. Re-connect power supply and test switch action by varying liquid level in the vessel or by blowing-down float chamber. Re-connect power supply and test switch action by varying liquid level in the vessel or by blowing down float chamber. REPLACING DRY CONTACT SWITCHES Series B, C, D, F, O, Q, S, U, W & X CAUTION: Before attempting to work on a switch mechanism, be certain to pull, disconnect switch or otherwise assure that electrical circuit through control is de-energized. 1. Disconnect switch leads from terminal block. Note and record terminal connections of switch to be replaced. 2. Remove two mounting screws holding existing switch. (See Figure 6). Figure 4 Series E, T & 2 Follow instructions for Series A except: 1. Replace new mercury switch into clips making certain that a space of 9.5 mm (3/8") exists from edge of clip to point where lead wires attach to glass tube. Lead wires should project downward at 90% angle from horizontal plane. (See Fig. 5). 3. Remove existing switch and install replacement switch in the same position, tightening mounting screws securely. NOTE: For proper operation of the replacement switch, it must actuate in the middle portion of the pivoted magnet's swing. Figure 6 4. Check switch action and adjust as follows: Figure 5 2. Glue switch to clips using a cement such as: DuPont Duco, Goodyear Pliobond, Shellac or equivalent. (See Fig. 2). 3. Connect switch leads to terminal block on identical post positions as those in the original assembly. NOTE: Check to be certain that switch glass tube is not resting on the upper switch lead and that switch leads "drape" loosely when switch magnet is in the "swing-out" position. Glass tube may be slid forward in clips toward terminal block to correct such conditions. 4. Check new mercury switch carefully to see that it makes and breaks circuit properly. A. Slowly swing switch magnet through its operating angle. Mercury must make and break contact between electrodes before magnet comes to its "IN" stop or "OUT" stop. A. Slowly rotate the pivoted magnet by hand, back and forth through its angle of swing, listening closely for the actuating click of the switch in each direction. B. Check to see if there is equal addition over-travel of magnet in its swing after the switch click in either direction. C. If switch actuation is not correct, change adjustment of actuating screw using a 1/16" hexagon key wrench. (See Fig. 6). NOTE: If a single switch is being replaced on a DPDT mechanism, lever of second switch must be depressed and held to allow for the audible adjustment of new switch, as described above. D. With new switch in adjustment, release lever of second switch and perform fine-tuning of both switches to provide simultaneous actuation (clicks). 5. Re-connect power supply and test switch action by varying liquid level in the vessel or by blowing-down float chamber. B. If action is incorrect, contact factory for replacement. 3 MODEL NUMBER DESCRIPTION Example: Magnetrol mechanical level switches are identified by an alphnumeric part numbering system. The last three digits of the part number describe the type of switch mechanism, enclosure cover length and finish and magnet strength. Basic model number MAGNET STRENGTH Switch Mechanism, Enclosure & Magnet Strength Magnetrol switch mechanisms are provided with different strength magnets as determined by the materials of construction. A red, white or yellow dot is visible on each magnet. When ordering replacement switch mechanisms, be certain to determine the colour dot on the magnet. B 7 5 1 B 2 0 A A A Materials of construction Tank connections CAUTION: NEVER replace a switch mechanism with a mechanism containing a dot of a different colour. AVAILABLE SWITCH MECHANISMS Type of switch module ➀ Max. Process Temp. ➁ Switch ratings – A res. ➂ Code 24 V DC 240 V AC 120 V AC ➀ ➁ ➂ ➃ Micro switch max 120 °C (250 °F) 6 15 15 B Micro switch max 230 °C (450 °F) 10 15 15 C Micro switch - DC current max 120 °C (250 °F) 10 – 10 D Micro switch with gold alloy contacts max 120 °C (250 °F) 1 – 1 U Hermetically sealed micro switch max 290 °C (500 °F) 5 5 5 HS ➃ Hermetically sealed micro switch with silver plated contacts max 230 °C (450 °F) 3 1 1 W Hermetically sealed micro switch with gold plated contacts max 230 °C (450 °F) 0,5 0,5 0,5 X Hermetically sealed micro switch max 400 °C (750 °F) 4 – 2,5 F Proximity switch - type SJ 3.5 SN max 100 °C (210 °F) NA NA NA V Mercury switch max 290 °C (500 °F) 10 6,5 13 A Mercury switch max 400 °C (750 °F) 10 6,5 13 3 Pneumatic bleed type (open air) max 200 °C (400 °F) NA NA NA J Pneumatic non bleed type (closed circuit) max 200 °C (400 °F) NA NA NA K For applications with heavy vibration, consult factory for suited switch modules. Max process temperature is specified at 40 °C (100 °F) ambient temperature and for non condensing applications. For more details - see bulletin BE 42-120. For condensing applications, max process temperature is down-rated to 200 °C (400 °F) @ 40 °C (100 °F) ambient. AVAILABLE HOUSINGS • • • • • For Non Ex use IP 66 Die cast Aluminium 2 Entries (one plugged) Standard blue anti corrosive coating • Housing heater/drain available, consult factory 4 • • • • • For Exd/Exi use IP 66 Die cast Aluminium 2 Entries (one plugged) Standard blue anti corrosive coating • ATEX II 2G EEx d II C T6 • ATEX II 1G EEx ia II C T6 • • • • For Exd use IP 66 Cast Iron One entry (2 entries at request) • Standard blue anti corrosive coating • CENELEC EEx d II C T6 • • • • For pneumatic switches IP 53 (NEMA 3R) IP 55 optional at request Alu base / cold rolled steel cover • Standard blue anti corrosive coating • • • • • For Exd use IP 66 (NEMA 7/9) Die cast Aluminium 2 Entries (one plugged) Standard blue anti corrosive coating • FM, Class I, Div. 1, Groups C & D • FM, Class II, Div. 1, Groups E, F & G Electric switch mechanism & enclosure for models with tall cover All models with red dot magnets qty and switch type A 3 B C D F HS U V W X Weather proof (IP 66) cast Aluminium All models with yellow dot magnets ATEX (IP 66) CENELEC (IP 66) FM (IP 66) II 2G EEx d II C T6 II 1G EEx ia II C T6 EEx d II C T6 NEMA 7/9 cast Iron cast Alu. M20 x 1,5 3/4" NPT 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT cast Aluminium cast Aluminium Weather proof (IP 66) cast Aluminium ATEX (IP 66) CENELEC (IP 66) FM (IP 66) II 2G EEx d II C T6 II 1G EEx ia II C T6 EEx d II C T6 NEMA 7/9 cast Iron cast Alu. M20 x 1,5 3/4" NPT 1" NPT cast Aluminium cast Aluminium M20 x 1,5 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT 1 x SPDT A2A AAA AKC ACC - - AK7 AU7 AKA A2B AAB AK9 AC9 - - AK5 AU5 2 x SPDT A4A ABA ALC ADC - - AL7 AV7 ALA A4B ABB AL9 AD9 - - AL5 AV5 ALB 3 x SPDT 36E 3CA 38E 3EE - - 367 377 3ME A6B ACB AM9 AE9 - - A65 A75 AMB 1 x DPDT A8A ADA ANC AFC - - AD7 AW7 ANA A8B ADB AN9 AF9 - - AD5 AW5 ANB 2 x DPDT A1A AEA APC AGC - - AO7 AY7 AOA A1B AEB AP9 AG9 - - AO5 AY5 AOB 1 x SPDT 32A 3AA 3KC 3CC - - 3K7 3U7 3KA 32B 3AB 3K9 3C9 - - 3K5 3U5 3KB 2 x SPDT 34E 3BA 39E 3DE - - 3L7 3V7 3LE 34B 3BB 3L9 3D9 - - 3L5 3V5 3LB 3 x SPDT 36E 3CA 38E 3EE - - 367 377 3ME 36B 3CB 3M9 3E9 - - 365 375 3MB 1 x DPDT 38A 3DA 3NC 3FC - - 3D7 3W7 3NA 38B 3DB 3N9 3F9 - - 3D5 3W5 3NB 2 x DPDT 31A 3EA 3PC 3GC - - 3O7 3Y7 3OA 31B 3EB 3P9 3G9 - - 3O5 3Y5 3OB 1 x SPDT B2A BAA BKC BCC - - BK7 BU7 BKA B2B BAB BK9 BC9 - - BK5 BU5 BKB 2 x SPDT B4A BBA BLC BDC - - BL7 BV7 BLA B4B BBB BL9 BD9 - - BL5 BV5 BLB 3 x SPDT B6A BCA BMC BEC - - B67 B77 BMA B6B BCB BM9 BE9 - - B65 B75 BMB 1 x DPDT B8A BDA BNC BFC - - BD7 BW7 BNA B8B BDB BN9 BF9 - - BD5 BW5 BNB 2 x DPDT B1A BEA BPC BGC - - BO7 BY7 BOA B1B BEB BP9 BG9 - - BO5 BY5 BOB 1 x SPDT C2A CAA CKC CCC C2X CAX CK7 CU7 CKA C2B CAB CK9 CC9 C2T CAT CK5 CU5 CKB 2 x SPDT C4A CBA CLC CDC C4X CBX CL7 CV7 CLA C4B CBB CL9 CD9 C4T CBT CL5 CV5 CLB 3 x SPDT C6A CCA CMC CEC - - C67 C77 CMA C6B CCB CM9 CE9 - - C65 C75 CMB 1 x DPDT C8A CDA CNC CFC C8X CDX CD7 CW7 CNA C8B CDB CN9 CF9 C8T CDT CD5 CW5 CNB 2 x DPDT C1A CEA CPC CGC C1X CEX CO7 CY7 COA C1B CEB CP9 CG9 C1T CET CO5 CY5 COB 1 x SPDT D2B DAB DK9 DC9 - - DK5 DU5 DKB D2B DAB DK9 DC9 - - DK5 DU5 DKB 2 x SPDT D4B DBB DL9 DD9 - - DL5 DV5 DLB D4B DBB DL9 DD9 - - DL5 DV5 DLB 3 x SPDT - - - - - - - - - D6B DCB DM9 DE9 - - D65 D75 DMB 1 x DPDT D8B DDB DN9 DF9 - - DD5 DW5 DNB D8B DDB DN9 DF9 - - DD5 DW5 DNB 2 x DPDT D1B DEB DP9 DG9 - - DO5 DY5 DOB D1B DEB DP9 DG9 - - DO5 DY5 DOB 1 x SPDT FCA FAA FKC FCC - - FK7 FU7 FKA FCB FAB FK9 FC9 - - FK5 FU5 FKB 2 x SPDT FFA FBA FLC FDC - - FL7 FV7 FLA FFB FBB FL9 FD9 - - FL5 FV5 FLB 1 x DPDT FGA FDA FNC FFC - - FD7 FW7 FNA FGB FDB FN9 FF9 - - FD5 FW5 FNB AKB 2 x DPDT FHA FEA FPC FGC - - FO7 FY7 FOA FHB FEB FP9 FG9 - - FO5 FY5 FOB 1 x SPDT H7A HM2 HFC HA9 - - HB3 HB4 HM3 H7A HM2 HFC HA9 - - HB3 HB4 HM3 1 x DPDT H7C HM6 HGC HB9 - - HB7 HB8 HM7 H7C HM6 HGC HB9 - - HB7 HB8 HM7 1 x SPDT U2A UAA UKC UCC U2X UAX UK7 UU7 UKA U2B UAB UK9 UC9 U2T UAT UK5 UU5 UKB 2 x SPDT U4A UBA ULC UDC U4X UBX UL7 UV7 ULA U4B UBB UL9 UD9 U4T UBT UL5 UV5 ULB 3 x SPDT U6A UCA UMC UEC - - U67 U77 UMA U6B UCB UM9 UE9 - - U65 U75 UMB 1 x DPDT U8A UDA UNC UFC U8X UDX UD7 UW7 UNA U8B UDB UN9 UF9 U8T UDT UD5 UW5 UNB 2 x DPDT U1A UEA UPC UGC U1X UEX UO7 UY7 UOA U1B UEB UP9 UG9 U1T UET UO5 UY5 UOB - - - - - VJS VLS - - - - - - - VCS VES - - - 1 x SPDT W2A WAA WKC WCC W2X WAX WK7 WU7 WKA W2B WAB WK9 WC9 W2T WAT WK5 WU5 WKB 2 x SPDT W4A WBA WLC WDC W4X WBX WL7 WV7 WLA W4B WBB WL9 WD9 W4T WBT WL5 WV5 WLB 3 x SPDT W6A WCA WMC WEC - - W67 W77 WMA W6B WCB WM9 WE9 - - W65 W75 WMB 1 x DPDT W8A WDB WN9 WF9 W8T WDT WD5 WW5 WNB W8B WDB WN9 WF9 W8T WDT WD5 WW5 WNB 2 x DPDT W1B WEB WP9 WG9 W1T WET WO5 WY5 WOB W1B WEB WP9 WG9 W1T WET WO5 WY5 WOB 1 x SPDT X2A XAA XKC XCC X2X XAX XK7 XU7 XKA X2B XAB XK9 XC9 X2T XAT XK5 XU5 XKB 2 x SPDT X4A XBA XLC XDC X4X XBX XL7 XV7 XLA X4B XBB XL9 XD9 X4T XBT XL5 XV5 XLB 3 x SPDT X6A XCA XMC XEC - - X67 X77 XMA X6B XCB XM9 XE9 - - X65 X75 XMB 1 x DPDT X8B XDB XN9 XF9 X8T XDT XD5 XW5 XNB X8B XDB XN9 XF9 X8T XDT XD5 XW5 XNB 2 x DPDT X1B XEB XP9 XG9 X1T XET XO5 XY5 XOB X1B XEB XP9 XG9 X1T XET XO5 XY5 XOB Select electric switch mechanism & enclosure for models with short cover All models with red dot magnets qty and switch type A 3 B C D F HS U V W X ATEX (IP 66) Weather proof (IP 66) EEx d IIC T6 cast Aluminium cast Aluminium All models with yellow dot magnets CENELEC (IP 66) FM (IP 66) II 1G EEx ia II C T6 EEx d IIC T6 cast Aluminium ATEX (IP 66) CENELEC (IP 66) FM (IP 66) NEMA 7/9 Weather proof (IP 66) EEx d IIC T6 II 1G EEx ia II C T6 EEx d IIC T6 NEMA 7/9 cast Iron cast Alu. cast Aluminium cast Aluminium cast Aluminium cast Iron cast Alu. M20 x 1,5 3/4" NPT M20 x 1,5 3/4" NPT 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT M20 x 1,5 1" NPT 1 x SPDT A2P AAP AHC AAC - - AK7 AU7 AKP A2Q AAQ AH9 AA9 - - AK5 AU5 AKQ 1 x DPDT A8P ADP AJC ABC - - AD7 AW7 ANP A8Q ADQ AJ9 AB9 - - AD5 AW5 ANQ 1 x SPDT 32P 3AP 3HC 3AC - - 3K7 3U7 3KP 32Q 3AQ 3H9 3A9 - - 3K5 3U5 3KQ 1 x DPDT 38P 3DP 3JC 3BC - - 3D7 3W7 3NP 38Q 3DQ 3J9 3B9 - - 3D5 3W5 3NQ 1 x SPDT B2P BAP BHC BAC - - BK7 BU7 BKP B2Q BAQ BH9 BA9 - - BK5 BU5 BKQ 1 x DPDT B8P BDP BJC BBC - - BD7 BW7 BNP B8Q BDQ BJ9 BB9 - - BD5 BW5 BNQ 1 x SPDT C2P CAP CHC CAC C2L CAL CK7 CU7 CKP C2Q CAQ CH9 CA9 C2S CAS CK5 CU5 CKQ 1 x DPDT C8P CDP CJC CBC C8L CDL CD7 CW7 CNP C8Q CDQ CJ9 CB9 C8S CDS CD5 CW5 CNQ 1 x SPDT - - - - - - - - - D2Q DAQ DH9 DA9 - - DK5 DU5 DKQ 1 x DPDT - - - - - - - - - D8Q DDQ DJ9 DB9 - - DD5 DW5 DNQ 1 x SPDT F2P FAP FHC FAC - - FK7 FU7 FKP F2Q FAQ FH9 FA9 - - FK5 FU5 FKQ 1 x DPDT F8P FDP FJC FBC - - FD7 FW7 FNP F8Q FDQ FJ9 FB9 - - FD5 FW5 FNQ 1 x SPDT - - - - - - - - - H7A HM2 HFC HA9 - - HB3 HB4 HM3 1 x DPDT - - - - - - - - - H7C HM6 HGC HB9 - - HB7 HB8 HM7 1 x SPDT U2P UAP UHC UAC U2L UAL UK7 UU7 UKP U2Q UAQ UH9 UA9 U2S UAS UK5 UU5 UKQ 1 x DPDT U8P UDP UJC UBC U8L UDL UD7 UW7 UNP U8Q UDQ UJ9 UB9 U8S UDS UD5 UW5 UNQ - - - - - VFS VHS - - - - - - - V5S VBS - - - 1 x SPDT W2P WAP WHC WAC W2L WAL WK7 WU7 WKP W2Q WAQ WH9 WA9 W2S WAS WK5 WU5 WKQ WNQ 1 x DPDT - - - - - - - - - W8Q WDQ WJ9 WB9 W8S WDS WD5 WW5 1 x SPDT X2P XAP XHC XAC X2L XAL XK7 XU7 XKP X2Q XAQ XH9 XA9 X2S XAS XK5 XU5 XKQ 1 x DPDT - - - - - - - - - X8Q XDQ XJ9 XB9 X8S XDS XD5 XW5 XNQ 5 Electric switch mechanism & enclosure for B40 models with tall cover and yellow dot magnets qty and switch type F Weather proof (IP 66) cast Aluminium M20 x 1,5 1" NPT ATEX (IP 66) FM (IP 66) II 2G EEx d II C T6 cast Aluminium M20 x 1,5 1" NPT NEMA 7/9 cast Alu. 1" NPT 1 x SPDT FCB FAB FK9 FC9 FKB 1 x DPDT FGB FDB FN9 FF9 FNB S for AC current 1 x SPDT S2B SAB SH9 SA9 SKB 1 x DPDT S8B SDB SJ9 SB9 SNB S for DC current 1 x SPDT S2R SBB SK9 SC9 SLB 1 x DPDT S8R SEB SN9 SF9 SOB qty and switch type L Weather proof (IP 65) Alu base / cold rolled steel cover 3/4" NPT NEMA 7/9 (IP 66) cast Iron 1" NPT 1 x SPDT LAM LKM 1 x DPDT LDM LNM INSTALLATION cont. Series E, T & 2 Vessel Baffle plate ▼ Frame mounting screw ▼ ▼ INCORRECT ▼ Direction of vibrations ▼ Magnetrol controls are frequently used on applications where vibration is encountered, such as on scrubbers in oil field installations. Switch mechanisms may require repositioning to prevent sloshing of mercury in switches. This position is usually best at right angles to the direction of vibration. The direction of vibration may be determined by the arrangement of connections to the vessel or the vessel's mounting method. Accordingly, the vibration will tend to be in one direction only. Upon determining the vibration direction, switch mechanism(s) may be rotated from an incorrect position (as shown in Figure 7 at right which is looking at a control from above) to a correct position as follows: ▼ CAUTION: Before attempting to remove a switch mechanism, be certain to pull, disconnect switch or otherwise assure that electrical circuit through control is de-energized. Screwdriver 1. Disconnect control from power supply. ▲ 2. Loosen screw in split mounting clamp until mechanism slides freely on enclosing tube, see Figure 1 on page 2. Figure 7 ▼ 3. Rotate entire mechanism and bottom baffle plate, together to a correct position. CAUTION: Be certain power supply wires retain some slack at new position. Do not pull wires taut. Baffle plate ▼ NOTE: Amount of rotation will vary with each installation and may not be as much, as shown in illustration. ▼ 4. Check action of mercury in switch at new position. When mercury sloshes from side to side in glass tube instead of end to end, correct position has been attained. CORRECT 5. Tighten clamp screw on switch mechanism. 6 Direction of vibrations ▼ ▼ 6. Re-connect power supply and test switch action under de-prating conditions. ▼ Swing of switch REPLACEMENT MECHANISM Switch series A&N Contacts Yellow dot magnet Red dot magnet A switch 89-7401-009 A switch 89-7401-003 B switch 89-7401-012 B switch 89-7401-006 DPDT 89-7401-055 A switch 89-7401-103 B switch 89-7401-104 89-7401-122 A switch 89-7401-109 B switch 89-7401-110 89-7401-125 A switch 89-7401-105 B switch 89-7401-106 89-7401-123 A switch 89-7401-063 B switch 89-7401-068 89-7401-052 A switch 89-7401-096 B switch 89-7401-095 89-7401-098 89-7401-018 A switch 89-7401-101 B switch 89-7401-102 89-7401-121 A switch 89-7401-107 B switch 89-7401-108 89-7401-124 A switch NONE B switch NONE NONE A switch 89-7401-073 B switch 89-7401-078 89-7401-046 A switch 89-7401-094 B switch 89-7401-093 89-7401-097 SPDT 89-7401-015 DPDT 89-7401-024 SPDT 89-7401-155 DPDT 89-7401-156 AC...89-7401-161 DC...89-7401-162 AC...89-7401-163 DC...89-7401-164 A switch 89-7401-149 B switch 89-7401-150 89-7401-154 A switch 89-7401-146 B switch 89-7401-147 89-7401-148 A switch 47-5535-001 B switch 47-5534-001 47-6520-001 A switch 189-7410-003 B switch 189-7410-004 189-7410-005 A switch 189-7412-003 B switch 189-7412-004 A switch 89-7401-151 B switch 89-7401-152 89-7401-153 A switch 89-7401-157 B switch 89-7401-158 89-7401-159 A switch 47-5536-001 B switch 47-5533-001 47-6519-001 A switch 189-7410-001 B switch 189-7410-002 NONE A switch 189-7412-001 B switch 189-7412-002 189-7412-005 NONE SPDT DPDT B&Q SPDT DPDT C&O SPDT DPDT D SPDT DPDT E SPDT DPDT F L L Vibration resistant SPDT SPDT S DPDT 2 SPDT DPDT 3 SPDT DPDT U SPDT DPDT W SPDT DPDT X Replacement mechanism with switch (ES) SPDT DPDT NONE NONE Replacement switch only Left hand NONE 37-4301-003 37-4303-003 NONE 37-4604-001 37-4604-001 NONE 37-4621-002 37-4621-001 NONE 37-4606-001 37-4606-001 NONE 37-4304-002 37-4304-002 NONE 37-4610-001 37-4610-001 NONE 37-4325-001 NONE 37-4302-004 NONE NONE Right hand AC...37-4621-001 DC...37-4606-001 NONE 37-4326-001 37-4302-003 AC...37-4621-002 DC...37-4606-001 37-4302-003 37-4302-004 NONE 37-4326-001 37-4325-001 NONE 37-4630-001 37-4630-001 NONE 37-9101-001 37-9101-001 NONE 37-9102-001 37-9102-001 7 WIRING DIAGRAMS SPDT DPDT Switch Identification Line Load Outside Circuit A B Make on Low 1 Common Line Make on High Internal circuit (left switch) Internal Circuit 4 1 4 5 2 2 5 6 3 3 6 Close on high level Load Common Load Internal circuit (right switch) Load Close on high level Common Close on low level Circuits shown are for direct acting level switches and are reversed in side mounting float-in-tank models, which utilize reversing float pivot. Close on Load Load low level Line Line IMPORTANT SERVICE POLICY Owners of Magnetrol products may request the return of a control; or, any part of a control for complete rebuilding or replacement. They will be rebuilt or replaced promptly. Magnetrol International will repair or replace the control, at no cost to the purchaser, (or owner) other than transportation cost if: a. Returned within the warranty period; and, b. The factory inspection finds the cause of the malfunction to be defective material or workmanship. If the trouble is the result of conditions beyond our control; or, is NOT covered by the warranty, there will be charges for labour and the parts required to rebuild or replace the equipment. In some cases, it may be expedient to ship replacement parts; or, in extreme cases a complete new control, to replace the original equipment before it is returned. If this is desired, notify the factory of both the model and serial numbers of the control to be replaced. In such cases, credit for the materials returned, will be determined on the basis of the applicability of our warranty. No claims for misapplication, labour, direct or consequential damage will be allowed. RETURNED MATERIAL PROCEDURE So that we may efficiently process any materials that are returned, it is essential that a “Return Material Authorisation” (RMA) form will be obtained from the factory. It is mandatory that this form will be attached to each material returned. This form is available through Magnetrol’s local representative or by contacting the factory. Please supply the following information: 1. Purchaser Name 2. Description of Material 3. Serial Number 4. Desired Action 5. Reason for Return 6. Process details All shipments returned to the factory must be by prepaid transportation. Magnetrol will not accept collect shipments. All replacements will be shipped FOB factory. BULLETIN N°: EFFECTIVE: SUPERSEDES: UNDER RESERVE OF MODIFICATIONS BENELUX ® DEUTSCHLAND FRANCE ITALIA UNITED KINGDOM INDIA BE 42-783.2 JUNE 2002 December 1997 Heikensstraat 6, 9240 Zele, België Tel. (052) 45.11.11 Fax. (052) 45.09.93 Schloßstraße 76, D-51429 Bergisch Gladbach-Bensberg Tel. (02204) 9536-0 Fax. (02204) 9536-53 Le Vinci 6 - Parc d’activités de Mitry Compans, 1, rue Becquerel, 77290 Mitry Mory Tél. 01.60.93.99.50 Fax. 01.60.93.99.51 Via Arese 12, I-20159 Milano Tel. (02) 607.22.98 (R.A.) Fax. (02) 668.66.52 Unit 1 Regent Business Centre Jubilee Road Burgess Hill West Sussex RH 15 9TL Tel. (01444) 871313 Fax (01444) 871317 B4/115 Safdurjung Enclave, New Delhi 110 029 Tel. 91 (11) 6186211 Fax 91 (11) 6186418