Electrical Electrical Electrical Electrical Electrical Data Data Data Data Data ..... Standard snap-action switch is a 20VA, SPST, Typical Typical Typical Typical Typical Wiring Wiring Wiring Wiring Wiring DiagramsDiagramsDDDiagramsiagramsiagrams hermetically sealed,magnetically actuated, Fabri-Level Fabri-Level Fabri-Level Fabri-Level Fabri-Level Switch Switch Switch Switch Switch KitKitKitKitKit make-and-break type. Normally open or nor- mally closed operation is selectable by invert- Instruction Bulletin No. 72946Instruction Bulletin No. 72946Instruction Bulletin No. 72946Instruction Bulletin No. 72946Instruction Bulletin No. 72946 ing floats on unit stem. A level station with SPDT 3-wire switch is available as a separate SPST SPST SPST SPST SPST Switch Switch Switch Switch Switch N.O. N.O. N.O. N.O. N.O. or or or or or N.C. N.C. N.C. N.C. N.C. (Dry).(Dry).(Dry).(Dry).(Dry). Fabri-Level Kits contain all components component if required. Specifications Specifications Specifications Specifications Specifications ..... Selectable Selectable by by Inverting Inverting Float.Float. Selectable Selectable Selectable by by by Inverting Inverting Inverting Float.Float.Float. for complete assembly of a 1- or 2- Conduit Thread: 1/2 NPT-F station level switch unit for pipe-plug Tube/Fitting Size: 1/2 O.D. mounting in your tank. Each kit con- Max. No. Levels per Stem: 6 Switch Switch Switch Ratings Ratings Ratings . Max. Max. Max. Resistive Resistive Resistive LoadLoadLoad tains: 1 Tube Connector, 1 Mounting Switch Switch Ratings Ratings Max. Max. Resistive Resistive LoadLoad o Mounting Attitude: Vertical 30 Black Com. Plug, 2 Level Stations (Switch, Tube, VA Volts Amps AC Amps DC Fitting Ferrule: Yellow N.C. Float), 2 Extension Tubes, 1 Tube End Buna N Floats: Nylon Red 0-30 .4 .3 N.O. Fitting, 3 Tube Unions. Stainless Floats: 316 Stainless Steel 20 120 .17 .13 240 .08 .06 SPDT SPDT Switch Switch in in N.C. N.C. (Dry) (Dry) PositionPosition SPDT SPDT SPDT Switch Switch Switch in in in N.C. N.C. N.C. (Dry) (Dry) (Dry) PositionPositionPosition N.O. or N.C. operation of the SPST switch is selectable by inverting the float(s) on the Note: Note: SPDT SPDT circuits circuits must must have haveN.ON.O toward toward lead lead wires. wires. SPDT SPDT floatsfloats unit stem. Note: Note: Note: SPDT SPDT SPDT circuits circuits circuits must must must have have haveN.ON.ON.O toward toward toward lead lead lead wires. wires. wires. SPDT SPDT SPDT floatsfloatsfloats are are are are are not not not not not reversible.reversible.reversible.rreversible.eversible. Two 10 lengths of tube are furnished to space level stations as desired. Oper. Oper. Oper. Oper. Oper. Temp.Temp.Temp.Temp.Temp. Min.Min.Min. Min.Min. Mtg.Mtg. Important Important Important Important Important Points Points Points Points Points Pres.Pres.Pres.Pres.Pres. Mtg.Mtg.Mtg. PartPartPartPartPart SwitchSwitchSwitchSwitchSwitch MaterialMaterialMaterialMaterialMaterial Sp. Sp. Sp. Sp. Sp. Gr.Gr.Gr.Gr.Gr. (Max.PSI)(Max.PSI)(Max.PSI)(Max.PSI)(Max.PSI) NPTNPTNPTNPTNPT NumberNumberNumberNumberNumber WaterWater OilOil WaterWaterWater OilOilOil Product must be maintained and installed in strict accordance with the National .55 -40F to Brass Fittings, 2 24576 o Electrical Code and GEMS product catalog and instruction bulletin. Failure to observe +230 F Buna N Floats o .75 To 180 F 1-1/4 SPST 26128 this warning could result in serious injuries or damages. 150 (82.2C) .75 An appropriate explosion-proof enclosure or intrinsically safe interface device must be 20 VA 1-1/4 26130 (-40C to 316 SS Fittings, used for hazardous area applications involving such things as (but not limited to) ignitable 55 +110C) Buna N Floats 2 26675 mixtures, combustible dust and flammable materials. o -40F to +275 F 2 Pressure and temperature limitations shown on individual catalog pages and drawings 24577 All 316 SS 750 .80 for the specified level switches must not be exceeded. These pressures and tempera- (-40C to +135C) tures take into consideration possible system surge pressures/temperatures and their frequencies. This product is suitable for Class I and Class II applications only, per the Selection of materials for compatibility with the media is critical to the life and requirements of standard EN60730 and any additional specific requirements operation of GEMS level switches. Take care in the proper selection of materials of for a particular application or medium being sensed. Class I compliance of construction particularly wetted materials. Life expectancy of switch contacts varies with applications. Contact GEMS if life metal bodied units requires a ground connection between the metal body and cycle testing is required. the earthing system of the installation. Class I compliance of plastic bodied Ambient temperature changes do affect switch set points, since the specific gravity of units in contact with a conductive medium requires that the medium be a liquid can vary with temperature. effectively earthed so as to provide an earthed barrier between the unit and Level switches have been designed to resist shock and vibration however, shock and accessible areas. For Class III compliance, a supply at safety extra-low vibration should be minimized. voltage (SELV) must be provided. Please consult the Factory for compliance Liquid media containing particulate and/or debris should be filtered to ensure proper information on specific part numbers. operation of GEMS products. Electrical entries and mounting points may require liquid/vapor sealing if located in an enclosed tank. Installation Installation Installation Installation Installation and and and and and Maintenance Maintenance Maintenance Maintenance Maintenance ..... Level switches must not be field repaired. Installation can be from top, bottom or side of tank, as shown below. Usually Physical damaged sustained by the product may render it unserviceable. installed as nearly vertical as possible, units will operate reliably as much as 30o from the vertical. Only two wrenches are needed to assemble. From one to six level stations may be spaced as desired on a single unit. You merely follow Assembly Assembly Assembly InstructionsInstructionsInstructions, install in tank, connect electrical leads and your tailor- Assembly Assembly InstructionsInstructions made unit is ready for use . in any media compatible with Brass and Buna N or P/N 72946 316 Stainless Steel - the two material options available. Rev. LInstallation Installation Installation Installation Installation and and and and and Maintenance Maintenance Maintenance Maintenance Maintenance (Cont.)(Cont.)(Cont.)(Cont.)(Cont.) Tube Inserted To Stop Closed Position Maintenance requirements are minimal and usually limited to occasional clean-up of 1-1/4 to 1-1/2 scum or scale accumulation. Turns Beyond Open PositionFinger-tigh Adapter Mounting Mounting Mounting Mounting Mounting Methods Methods Methods Methods Methods .. ..... Adapter Elbow Buna Buna Buna Buna Buna NNNNN 316 316 316 316 316 SSSSSSSSSS Union FloatFloatFloatFloatFloat FloatFloatFloatFloatFloat c/ Coupling Coupling Coupling Coupling Coupling Components Components Components Components Components TogetherTogetherTogetherTogetherTogether: Insert tubes to limit in fittings and tighten finger-tight. After checking entire unit, wrench-tighten as illustrated. Important: Important: Important: Important: Important: Always Always Always Always Always assemble assemble assemble assemble assemble entire entire entire entire entire unit unit unit unit unit finger-tightfinger-tightfinger-tightfinger-tightfinger-tight first, first, first, first, first, then then then then then check check check check check level level level level level lllocations llocations ocations ocations ocations and and and and and switch switch switch switch switch operation operation operation operation operation (N.O. (N.O. (N.O. (N.O. (N.O. or or or or or N.C.)N.C.)N.C.)N.C.)N.C.) 1. 3. 4. 2. b b b b beeeeefffffooooorrrrreeeee f ffffiiiiinnnnnaaaaalllll tttttiiiiiggggghhhhhttttteeeeennnnniiiiinnnnnggggg..... 1. 1-1/4 or 2 NPT pipe plug. Top or bottom mount, boss or thickwall tank. 2. Install Install Install Install Install Unit Unit Unit Unit Unit in in in in in Tank:Tank:Tank:Tank:Tank: Fabri-Level units with 1 1/4 or 2 NPT mounting Permits unit insertion from outside. plugs are installed through a boss or tapped hole from outside of tank. Units with alternate mountings are installed from the inside. 2. 3/8 NPT-M tube connector. Top or bottom mount from inside. Boss or thickwall tank. 3. Electrical Electrical Electrical Electrical Electrical Leads: Leads: Leads: Leads: Leads: Leads are readily identified for connection i.e., switch o leads nearest mounting end of unit project the farthest, etc. CAUTION:CAUTION:CAUTION:CAUTION:CAUTION: 3, 4. Top-mount through sheet metal cover, or with 90 elbow for mounting unit S S S S Seeeeeeeeee SSSSSwwwwwitch itch itch itch itch RRRRRatings atings atings atings atings before before before bbefore efore connecting connecting connecting connecting connecting power power power power power to to to to to Fabri-Level Fabri-Level Fabri-Level Fabri-Level Fabri-Level unit.unit.unit.unit.unit. from inside of tank. Pressure-type Pressure-type Pressure-type Pressure-type Pressure-type fittingsfittingsfittingsfittingsfittings form positive seal. Tube cannot turn, Actuation Actuation Actuation Level Level Level Dimensional Dimensional Dimensional Data Data Data ... Actuation Actuation Level Level Dimensional Dimensional Data Data .. wires cannot twist during tightening. Nylon ferrule for brass Bulkhead units, SS ferrule for stainless units. 13/16 and 7/8 HEX Plug Adaptor Connector Side NoteNoteNote: NoteNote fittings. Mounted Mounted Mounted Mounted Buna N floats shown. 2 2 2 2 2 NPT NPT NPT NPT NPT mounting mounting mounting mounting mounting plug plug plug plug plug permits entire unit to be inserted in tank D F from outside. 1/2 NPT-F provides direct electrical conduit connection. A 1-1/4 NPT mounting plug is also available. A When two or more exten- Switch Actuation Levels sion tubes are coupled to- B gether for greater length, Assembly Assembly Assembly Assembly Assembly Instructions Instructions Instructions Instructions Instructions ..... C assemble coupling unions 1. Assemble unit, observing the following sketches and information. before cutting to length per E E or (In illustration at a/ a/ a/ a/ a/ Extension Extension Extension Extension Extension Tubes Tubes Tubes Tubes Tubes (When (When (When (When (When Required):Required):Required):Required):Required): Cut to proper length. Tubes 36 left). long are available as components, or use any 1/2 tubing of suitable non-magnetic material. For For For For For Units Units Units Units Units with with with with with Buna Buna Buna Buna Buna N N N N N Floats Floats Floats Floats Floats ..... For For For For For Units Units Units Units Units with with with with with 316 316 33316 16 16 Stainless Stainless SSStainless tainless tainless Floats Floats Floats Floats Floats .. ..... A. Min. with tube extension: 4-3/4 A. Min. with tube extension: 4-1/2 b/ b/ b/ b/ b/ Level Level Level Level Level Stations:Stations:Stations:Stations:Stations: Assemble floats on switch tubes for desired switch Cut tube to length: minus 2-7/8 Cut tube to length: minus 2-5/8 operation, as shown. Feed level station wires through switch tubes of B. Min. with tube extension: 6-5/16 B. Min. with tube extension: 6-5/8 each level station, toward mounting plug. Note: Note: Note: Note: Note: Floats Floats Floats Floats Floats are are are are are shown shown shown shown shown ininininin Cut tube to length: minus 4-15/16 Cut tube to length: minus 4-11/16 C. 4-1/4 : Closest that levels can be. C. 4-1/2 : Closest that levels can be. normally open (dry) position. To reverse operation, invertnormally open (dry) position. To reverse operation, invertnormally open (dry) position. To reverse operation, invertnormally open (dry) position. To reverse operation, invertnormally open (dry) position. To reverse operation, invert D. 2-5/8 : Highest possible level. D. 2-3/8 : Highest possible level. floats. floats. floats. floats. floats. (See next page) E. 2-1/8 : Lowest possible level. E. 2-5/8 : Lowest possible level. NoteNoteNoteNoteNote F. 2-7/8 : Minus tank wall thickness. F. 2-5/8 : Minus tank wall thickness. SPDT SPDT SPDT SPDT SPDT circuits circuits circuits circuits circuits must must must must must have have have have haveN.ON.ON.ON.ON.O towards towards towards towards towards lead lead lead lead lead wire wire wire wire wire end end end end end of of of of of switch switch switch switch switch tube.tube.tube.tube.tube. SPDT SPDT SPDT SPDT SPDT floats floats floats floats floats are are are are are not not not not not reversible.reversible.reversible.reversible.reversible.