SWITCH ACTION (Normally open/Normally closed)Vertical ModelsVertical mount models are shipped with normally open switch contacts which closeas the float rises toward the mounting threads. Reverse switch action by removingthe float, rotating it end-for-end and replacing it on the stem.Horizontal ModelsContacts in horizontal models F7-HPS-1 (internal mount) and F7-HPS-2 (externalmount), are normally open when the float is down and normally closed when thefloat is up. Models F7-HPS-1 and -2 also have indicating arrows on the stem endto confirm float alignment. See installation notes on reverse. Horizontal model F7-HSS is in the normally open position when the indicating arrow points up, andnormally closed when the arrow points down.INSTALLATIONChoose a location away from fill pipes, drains, or other areas where turbulence orwave motion might occur. Turbulence will cause false actuations and shortencontact life. Excess contaminants in fluid may inhibit float operation and occasionalwipe-down may be necessary. Care should be taken that switches are alwaysoperated within electrical ratings. Read and understand all safety precautions onback of this sheet before installing.MOUNTINGInstall vertical mount models in an appropriate 1/8˝ NPT fitting. Vertical modelsmount internally, oriented within 30° of vertical, or select optional fittings forexternal mounting. Model F7-HPS-1 must be mounted internally, which means theswitch must be secured to the wall of the tank or vessel from the inside. Installhorizontal model F7-HPS-1 in a 5/8˝ (16 mm) hole and secure with nut provided.Tank wall should not exceed 1/8˝ (3 mm). Model F7-HPS-2 requires a horizontal1/2˝ NPT(F) fitting and can be fitted to the tank or vessel from the outside. ModelF7-HSS requires a horizontal 1/2˝ NPT(F) fitting and can be mounting from theinside or outside (internally or externally) of the tank or vessel. Series F7 Liquid Level Switches Bulletin E-75PIPECOUPLINGELBOWPIPEDWYER INSTRUMENTS, INC. Phone: 219/879-8000www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057e-mail: info@dwyermail.comSPECIFICATIONSElectrical Rating (Maximum):F7-SB, SS2: AC: 25 VA, 1A @ 200 V.DC: 10W, 1A @ 200V.F7-PP, BT, HSS: AC: 30 VA, 0.14A @ 200V.DC: 0.28A @ 24 V, 0.07A @ 120V.F7-MPP: 10 VA, 0.1A @ 120 VAC.F7-MPP-NO: 50 VA, 0.2A @ 240 VAC.F7-HPS: 15 VA, 1A @ 220 VAC/DC.Mounting Connections:1/8˝ NPT(M) (all vertical mount), 1/2˝ NPT(M) (F7-HPS-2, F7-HSS), M16 x 2 (F7-HPS-1).Wire Leads: F7-SB, SS2, PP, BT: 22 AWG x 18˝ (46 cm); F7-MPP, HSS: 22AWG x 24˝ (61 cm); F7-HPS: 22 AWG x 39˝ (1m).Enclosure Rating:F7-HSS: Explosion-proof, Class 1, Groups A, B, C, D; ClassII, Groups E, F, G; Class III.Weight: F7-SB, 2 oz. (58 g); F7-SS2, 1.2 oz. (34 g); F7-PP, 0.8 oz. (23 g); F7-BT, 0.7 oz. (20 g); F7-HPS-1, 1.5 oz. (43 g); F7-HPS-2, 2 oz. (57 g); F7-HSS, 3oz. (94 g); F7-MPP, 0.8 oz. (23 g).(Model F7-SB Shown) ModelF7-SBF7-SS2F7-PPF7-BTF7-MPP(A) StemLength2.75 (70)2.06 (52)2.18 (55)2.18 (55)1.63 (41)(B) FloatDiameter1.13 (29)1.0 (25) 1.18 (30)1.18 (30)0.63 (16)(C) FloatHeight1.38 (35)1.0 (25)1.0 (25)1.0 (25)0.63 (16)(D) Actuationfrom HEX1.0 (26)0.73 (19)0.69 (18)0.69 (18)0.47 (12)ModelVertical MountF7-SBF7-SS2F7-PPF7-BTF7-MPPHorizontal MountF7-HPS-1, -2F7-HSSMaterial Float/StemBuna-N & Epoxy/316SS316SS (CYC)/316SSPolypropylene &Epoxy/PolypropyleneBuna-N & Epoxy/PBT*Polypropylene /PolypropylenePolysulfone/Polysulfone316SS/316SSMax Temp.220°F105°C300°F149°C220°F105°C220°F105°C176° F80° C185°F85°C392°F200°CMax Press.150 psig10 bar450 psig31 bar100 psig6.89 bar150 psig10 bar100 psig6.89 bar150 psig10 bar300 psig20.7 barMinS.G.0.600.750.600.450.900.850.60Approx.Deadband1/16˝2 mm1/16˝2 mm1/8˝4 mm1/8˝4 mm1/8˝4 mm3/16˝5 mm1/8˝4 mmDimensions, Inches (mm)*PBT - Polybutylene TerephthalateOptional Fittings (for Exterior Mounting of Vertical Models)A-347,1/8˝ x 1-1/4˝ NPT C.S. Adapter.A-347-SS,1/8˝ x 1-1/4˝ NPT 316SS Adapter.A-348,1/8˝ x 1-1/2˝ NPT C.S. Adapter.A-348-SS,1/8˝ x 1-1/2˝ NPT 316SS Adapter. 13/16 [20.62]DIA. MAX.1-33/64[38.48]40∞ MAX3-15/32 [88/09]M16X2SWITCH CLOSEDPOSITION2-15/64 [56.74]SWITCH OPEN POSITION13/16 [20.62]MAX1-19/32[40.46]40∞ MAXSWITCH CLOSED POSITION3-7/16 [87.29]2-23/64 [59.92]2 [50.80]1/2 NPTSWITCH OPEN POSITION3/4[19.05]13/16 MIN[20.6]22 AWGLEAD WIRES1/2-14 NPT4-5/8 MAX[116.8]APPROXIMATEACTUATION LEVELFITTINGCENTERLINE3/32[2.54]1-7/32 MAX[31.0]1-5/32 MAX[29.2]CBDAEXTERNALLYWELDED FLANGEF7-HPS-2, INTERNAL HORIZONTAL MOUNTF7-HPS-2, EXTERNAL HORIZONTAL MOUNTSpecifications - Installation and Operating InstructionsF7-HSSInductive LoadsPossible causes-An electromagnetic relay, electromagneticsolenoid, electromagnetic counter with inductivecomponent as circuit load.Capacitive LoadsPossible causes -A capacitor connected in series or parallel withReed Switch control. In a closed circuit, a cablelength (usually greater than 50m [162.5 ft.])used to connect reed switch may also introducestatic capacitance.Lamp LoadsPossible causes- A tungsten filament lamp load.©Copyright 2014 Dwyer Instruments, Inc.Printed in U.S.A. 7/14FR# 82-440677-00 Rev. 5Installation Notes- Do not subjectreed switch controls to excessiveshock or vibration or any of thefollowing: •Bending or placing force loads on reed switch housing.•Over-torquing fittings on reed switch housing.•Placing pull-out force on lead wires.CIRCUIT INFORMATION FOR REED SWITCH PROTECTIONRead information below before installing your new reed switch control!Exceeding the current capacity of this Reed Switch control may cause FAULTY OPERATION! Be aware of the inductive and capacitive or lamp loads you may be placing onyou Reed Switch Control. The circuits below outline possible solutions to preventing overloads due to inrush or surge currents exceeding maximum or when the switch currentand product of the inductive back EMF exceed the switch’s power rating. Also the circuit for prevention of overload when switching filament lamps (low “cold” resistance) isoutlined below. Failure to follow these measures to protect Reed Switch Contacts may cause the contacts to weld together or result in premature wear.Indicating arrows are provided on the stemends to confirm float alignment.Do not exceed 1.5 pounds/foot (2 n/m) tighteningtorque. Excessive torquemay cause premature switchelement or housing failure.Avoid installations wherewiring entering the device is submerged or exposed toexcessive amounts of liquid or humidity condensate.Gasket seal for internalmounting units should be pre-assembled before insertion through tank wall. Wall thick-ness should not exceed 1/8"(3 mm).When preparing wires fortermination, avoid pullingagainst the resin seal or end plug of the float switch.Units with tapered pipe threads should be treated with Teflon based thread compound or tape beforeinsertion in fitting. Sufficient torque is achieved at hand-tight plus one half turn.Possible Circuit Solutions Indicated by Dashed LinesDIODE SUPPRESSIONDIODEINDUCTIVELOADPIV DIODE > VREEDSWITCHREEDSWITCHUSED INAC CIRCUITSVARISTERVARISTER PROTECTIONINDUCTIVELOADRC SUPPRESSIONRCINDUCTIVE PROTECTION FORCABLE LENGTH CAPACITANCELOADREEDSWITCHCable Lengthover 50 meters[162.5 ft.]REEDSWITCHRESISTOR PROTECTIONFOR CAPACITIVE LOADSURGE LIMITER FORCAPACITANCE IN SERIESREEDSWITCHCURRENT LIMITING RESISTORIN SERIESCURRENT LIMITING RESISTORIN PARALLELREEDSWITCHREEDSWITCHINDUCTIVELOADREEDSWITCHSWITCH[uf]10CR10*I(1+50/E)SWITCH2CLOADSWITCHSWITCHLOADCRL =0.5~5 mHP+VRAPLRA+VR = 50~500 OhmsRBPLL = 0.5~5 mHP+VRLRRV-0.12 RL2+VRL5R > RLRDWYER INSTRUMENTS, INC. Phone: 219/879-8000www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057e-mail: info@dwyermail.comNext >