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Flow Switches

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<p>Flow switches detect fluid flow in hydraulic systems and prevent leaks. They are used in pumps in the water treatment, oil & gas and chemical industries.</p>
GEMS SENSORS -

Liquid Flow Switch

StyleModelBody MaterialConnection SizeContact RatingFlow RateMaterialMax. Ambient Temp.Max. Fluid Temp.Max. PressurePrice (ex. VAT)
AFS-550 29609Brass1 MNPT20VA15 to 48 gpmBrass, SS, Ceramic, PTFE300 F300 F2000 psi€525.07
BRFS 156265Brass1/4 FNPT35mA/95mA0.1 to 5 gpmBrass, Ceramic, PPS Composite, Polysulfone, Viton150 F212 F200 psi€669.44
BRFS 156268Brass1/2 FNPT35mA/95mA1.5 to 20 gpmBrass, Ceramic, PPS Composite, Polysulfone, Viton150 F212 F200 psi€651.47
BRFS 180395Brass3/4 FNPT35mA/95mA5 to 30 gpmBrass, Ceramic, PPS Composite, Polysulfone, Viton150 F212 F200 psi€633.01
BRFS 181688Brass1 FNPT35mA/95mA8 to 60 gpmBrass, Ceramic, PPS Composite, Polysulfone, Viton150 F212 F200 psi€676.89
CFS-400 26600Bronze3/4 FNPT20VA0.75 to 4 gpmBronze, Delrin, SS, Viton, Ceramic180 F180 F400 psi€497.71
CFS-400 26601Bronze3/4 FNPT20VA2 to 8 gpmBronze, Delrin, SS, Viton, Ceramic180 F180 F400 psi€515.09
CFS-400 26602Bronze3/4 FNPT20VA7 to 14 gpmBronze, Delrin, SS, Viton, Ceramic180 F180 F400 psi€488.89
DFS-200 26615Bronze1 FNPT20VA1 to 6 gpmBronze, PTFE, SS, Viton, Ceramic200 F200 F400 psi€503.00
DFS-200 26616Bronze1 FNPT20VA5 to 15 gpmBronze, PTFE, SS, Viton, Ceramic200 F200 F400 psi€529.96
DFS-200 26838Bronze1 FNPT20VA2 to 8 gpmBronze, PTFE, SS, Viton, Ceramic200 F200 F400 psi€503.00
BRFS 155425Polypropylene1/4 FNPT35mA/95mA0.1 to 5 gpmPolypropylene, Ceramic, PPS Composite, Polysulfone, Buna N150 F180 F100 psi€493.57
BRFS 155485Polypropylene1/2 FNPT35mA/95mA1.5 to 20 gpmPolypropylene, Ceramic, PPS Composite, Polysulfone, Buna N150 F180 F100 psi€494.85
EFS-550 29608Stainless Steel1 MNPT20VA15 to 48 gpmSS, Ceramic, PTFE300 F300 F2000 psi€803.60
FFS-10798 25364Stainless Steel1/2 FNPT20VA0.5 to 20 gpmSS, Viton, Epoxy300 F300 F1000 psi€1,577.27
StyleModelBody MaterialMaterialPrice (ex. VAT)
AFS-10798 25365BrassBrass, SS, Viton, Epoxy€977.96
AFS-10798 25366Stainless SteelSS, Viton, Epoxy€1,571.87
JOHNSON CONTROLS -

Flow Switches

StyleModelConnection SizeContact RatingFlow RateMax. Ambient Temp.Max. Fluid Temp.Max. HPMax. PressureTypePrice (ex. VAT)
AF261KAH-V01C1 MNPT16A @ 120 VAC - Full Load2.5 gpm to 760 gpm140 Degrees250 Degrees1290Standard Flow€260.98
BF261MAH-V01C1 MNPT16A @ 120 VAC - Full Load2.5 gpm to 760 gpm1402501290Standard Flow€306.60
AF261MAL-V01C1"10A @ 120V AC/360VA @ 120V AC Pilot Duty2.5 gpm to 760 gpm140° F250° F1 hp290 psiStandard Flow€487.58
AF261KEH-V01C1/2 FNPT x 1/2 FNPT16A @ 120 VAC - Full Load0.6 gpm to 17 gpm1402501290Low Flow€296.84
AF261MEH-V01C1/2 FNPT x 1/2 FNPT16A @ 120 VAC - Full Load0.6 gpm to 17 gpm1402501290Low Flow€549.13
CF261KFH-V01C3/4 FNPT x 3/4 FNPT16A @ 120 VAC - Full Load0.6 gpm to 17 gpm1402501290Low Flow€389.07
AF261KFH-V02C3/4 FNPT x 3/4 FNPT16A @ 120 VAC - Full Load0.6 gpm to 17 gpm1402501290Low Flow€309.73
AF261MFH-V01C3/4 FNPT x 3/4 FNPT16A @ 120 VAC - Full Load0.6 gpm to 17 gpm1402501290Low Flow€561.04
MCDONNELL & MILLER -

Flow Switches

StyleModelPrice (ex. VAT)
AFS4-3DS€1,859.72
AFS4-3S€1,252.34
BFS4-3RP-T€620.86
CFS4-3T3-3/4€787.04
DFS5-D-3/4€1,051.36
EFS4-3D€730.91
FFS7-4SE€2,864.38
GFS7-4D€1,360.27
HFS4-3T1-3/4€830.40
IFS8-WJ€600.53
JFS4-3T3-1€920.18
DWYER INSTRUMENTS -

Liquid Flow Switches

StyleModelBody MaterialConduit Connection TypeConnection SizeGradeMax. Temp.Pressure RatingSwitch TypeTee Connection SizePrice (ex. VAT)
AV8-WP-MNPT1"-212° F150 psigSPDT-€285.82
BV8-MNPT1"-212° F150 psigSPDT-€206.05
CV6EPB-B-S-3-BBrass-----SPDT1"€571.94
CV6EPB-B-S-1-BBrass-----SPDT1/2"€493.04
CV6EPB-B-D-5-MIBrass-----DPDT1 1/2"€946.99
CV6EPB-B-D-3-BBrass-----DPDT1"€671.64
CV6EPB-B-D-6-0Brass-----DPDT2"€572.04
CV6EPB-B-D-4-BBrass-----DPDT1 1/4"€737.90
CV6EPB-B-S-2-MIBrass-----SPDT3/4"€539.62
CV6EPB-B-D-6-BBrass-----DPDT2"€1,077.98
CV6EPB-B-S-6-0Brass-----SPDT2"€469.88
DV4-2-D-UBrass-1 1/2"--1000 psigDPDT-€1,185.05
CV6EPB-B-S-3-MIBrass-----SPDT1"€692.16
CV6EPB-B-S-1-MIBrass-----SPDT1/2"€482.34
CV6EPB-B-D-4-MIBrass-----DPDT1 1/4"€825.30
DV4-2-UBrass-1 1/2"--1000 psigSPDT-€1,000.01
RFQ
CV6EPB-B-S-6-BBrass-----SPDT2"€973.15
CV6EPB-B-D-2-BBrass-----DPDT3/4"€661.32
CV6EPB-B-D-2-MIBrass-----DPDT3/4"€661.32
CV6EPB-B-S-5-MIBrass-----SPDT1 1/2"€760.93
CV6EPB-B-D-6-MIBrass-----DPDT2"€1,169.19
CV6EPB-B-D-LFBrass-----DPDT1/2"€851.76
CV6EPB-B-D-1-MIBrass-----DPDT1/2"€634.85
CV6EPB-B-D-3-MIBrass-----DPDT1"€740.65
CV6EPB-B-D-1-BBrass-----DPDT1/2"€584.22
GEMS SENSORS -

Flow Switch 20 Cm/sec

StyleModelConnection SizePrice (ex. VAT)
A230500-3-201 FNPT€805.87
A230500-4-201-1/2 FNPT€805.87
A230500-1-201/2 FNPT€782.88
A230500-2-203/4 FNPT€805.87
TACO -

Flow Switch 3.5 - 600 Spdt

StyleModelContact RatingMax. Ambient Temp.Max. HPSwitch TypePrice (ex. VAT)
AIFSWSBF-110A at 125/250151 Degrees1/3SPDT€341.48
BIFSWSBR-110A at 125/250 VAC151 Degrees1/3SPDT€391.72
CIFSW2BR-115A at 125/250 VAC176 Degrees1/8 to 1/4(2) SPDT€361.17
DIFS01BF-115A at 125/250 VAC176 Degrees1/8 to 1/4SPDT€256.62
EIFS02BF-115A at 125/250 VAC176 Degrees1/8 to 1/4(2) SPDT€439.76
FIFSW2BF-115A at 125/250 VAC176 Degrees1/8 to 1/4(2) SPDT€513.69
GIFS01BR-115A at 125/250 VAC176 Degrees1/8 to 1/4SPDT€379.69
HIFSH1BR-122A at 125/250 VAC176 Degrees1/2 to 1SPDT€333.87
IIFSH1BF-122A at 125/250 VAC176 Degrees1/2 to 1SPDT€316.91
JIFSH2BF-122A at 125/250 VAC176 Degrees1/2 to 1(2) SPDT€440.23
GEMS SENSORS -

Flow Switch 40 Cm/sec

StyleModelConnection SizeFlow RatePrice (ex. VAT)
A230500-3-51 FNPT5 cm/sec€844.54
A230500-3-401 FNPT40 cm/sec€805.87
A230500-4-51-1/2 FNPT5 cm/sec€844.54
A230500-4-401-1/2 FNPT40 cm/sec€926.67
A230500-1-401/2 FNPT40 cm/sec-
RFQ
A230500-2-53/4 FNPT5 cm/sec€805.87
A230500-2-403/4 FNPT40 cm/sec€767.82
GEMS SENSORS -

Flow Switch 60 Cm/sec

StyleModelConnection SizePrice (ex. VAT)
A230500-3-601 FNPT€805.87
A230500-1-601/2 FNPT€805.87
A230500-2-603/4 FNPT€844.54
GEMS SENSORS -

FS-150Series Flow Switch

StyleModelFlow RateSwitch TypePrice (ex. VAT)
AFS-150 NO 0.5GPM0.5 gpmSPST, Normally Open @ No Flow€221.84
AFS-150 NC 0.5GPM0.5 gpmSPST, Normally Closed @ No Flow€221.84
AFS-150 NO 1.0GPM1 gpmSPST, Normally Open @ No Flow€214.00
AFS-150 NC 1.0GPM1 gpmSPST, Normally Closed @ No Flow€205.41
AFS-150 NO 2.0GPM2 gpmSPST, Normally Open @ No Flow€210.56
AFS-150 NO 3.0GPM3 gpmSPST, Normally Open @ No Flow€221.84
GEMS SENSORS -

FS-380 Series Flow Switch

StyleModelBody MaterialContact RatingFlow RateMaterialMax. Ambient Temp.Max. Fluid Temp.Max. PressurePrice (ex. VAT)
AFS-380 168433Brass20VA0.5 gpmBrass, PPS Composite, Epoxy, SS, Fluorocarbon275 F275 F1500 psi€250.01
AFS-380 168432Brass20VA0.25 gpmBrass, PPS Composite, Epoxy, SS, Fluorocarbon275 F275 F1500 psi€253.64
AFS-380 178353Brass20VA2 gpmBrass, PPS Composite, Epoxy, SS, Fluorocarbon275 F275 F1500 psi€271.18
AFS-380 168435Brass20VA1.5 gpmBrass, PPS Composite, Epoxy, SS, Fluorocarbon275 F275 F1500 psi€271.18
AFS-380 168434Brass20VA1 gpmBrass, PPS Composite, Epoxy, SS, Fluorocarbon275 F275 F1500 psi€256.82
AFS-380 181130Brass20VA0.15 gpmBrass, PPS Composite, Epoxy, SS, Fluorocarbon275 F275 F1500 psi€271.18
BFS-380P 197081Polypropylene10VA0.25 gpmPolypropylene, PPS Composite, SS, Fluorocarbon212 F212 F125 psi€126.41
BFS-380P 209876Polypropylene10VA0.15 gpmPolypropylene, PPS Composite, SS, Fluorocarbon212 F212 F125 psi€126.41
BFS-380P 197085Polypropylene10VA2 gpmPolypropylene, PPS Composite, SS, Fluorocarbon212 F212 F125 psi€134.40
BFS-380P 197084Polypropylene10VA1.5 gpmPolypropylene, PPS Composite, SS, Fluorocarbon212 F212 F125 psi€126.41
BFS-380P 197083Polypropylene10VA1 gpmPolypropylene, PPS Composite, SS, Fluorocarbon212 F212 F125 psi€134.40
BFS-380P 197082Polypropylene10VA0.5 gpmPolypropylene, PPS Composite, SS, Fluorocarbon212 F212 F125 psi€126.41
CFS-380 193482Stainless Steel20VA0.15 gpmSS, PPS Composite, Epoxy, Fluorocarbon275 F275 F1500 psi€663.93
CFS-380 179992Stainless Steel20VA0.25 gpmSS, PPS Composite, Epoxy, Fluorocarbon275 F275 F1500 psi€687.72
CFS-380 179993Stainless Steel20VA0.5 gpmSS, PPS Composite, Epoxy, Fluorocarbon275 F275 F1500 psi€591.95
CFS-380 179995Stainless Steel20VA1.5 gpmSS, PPS Composite, Epoxy, Fluorocarbon275 F275 F1500 psi€627.17
CFS-380 179996Stainless Steel20VA2 gpmSS, PPS Composite, Epoxy, Fluorocarbon275 F275 F1500 psi€657.29
GEMS SENSORS -

FS-4 Series Flow Switch

StyleModelFlow RatePrice (ex. VAT)
AFS-4 1223520.1 gpm€237.37
AFS-4 1223540.5 gpm€244.59
AFS-4 1223530.25 gpm€256.36
AFS-4 1223550.75 gpm€218.06
AFS-4 1223561 gpm€227.57
StyleModelFlow RatePrice (ex. VAT)
AFS-500 1702320.5 gpm€179.96
AFS-500 1702310.25 gpm€803.60
AFS-500 1702331 gpm€176.72
AFS-500 1751172 gpm€176.90
AFS-500 1702342.5 gpm€179.96
AFS-500 1702355 gpm€179.96
StyleModelBody MaterialFlow RateMaterialMax. Fluid Temp.Price (ex. VAT)
AFS-926 26938Brass50 cc/minBrass, Polysulfone, SS, Viton, Epoxy225 F€591.62
AFS-926 26941Brass150 cc/minBrass, Polysulfone, SS, Viton, Epoxy225 F€591.62
AFS-926 26939Brass100 cc/minBrass, Polysulfone, SS, Viton, Epoxy225 F€561.48
AFS-926 26942Brass200 cc/minBrass, Polysulfone, SS, Viton, Epoxy225 F€561.48
AFS-926 26951Stainless Steel50 cc/minSS, Viton, Epoxy300 F€961.53
AFS-926 26952Stainless Steel100 cc/minSS, Viton, Epoxy300 F€961.53
AFS-926 26956Stainless Steel300 cc/minSS, Viton, Epoxy300 F€917.48
StyleModelFlow RateSwitch TypePrice (ex. VAT)
AFS-927 708260.1 gpmSPST, NC€226.61
AFS-927 708200.1 gpmSPST, NO€236.26
AFS-927 708220.5 gpmSPST, NO€248.97
AFS-927 708280.5 gpmSPST, NC€200.82
AFS-927 708270.25 gpmSPST, NC€225.43
AFS-927 708210.25 gpmSPST, NO€237.65
AFS-927 708290.75 gpmSPST, NC€225.43
AFS-927 708230.75 gpmSPST, NO€217.15
AFS-927 708301 gpmSPST, NC€236.26
AFS-927 708251.5 gpmSPST, NO€237.65
AFS-927 708311.5 gpmSPST, NC€191.63
MCDONNELL & MILLER -

Series FS6 Switch Liquid Flow

McDonnell & Miller FS6 liquid flow switches are designed to monitor the flow of liquids, such as water or oil, in pipes and systems. These liquid flow switches are highly sensitive and used in cooling systems, booster pumps, water treatment systems and compressors. They have a sealed compartment that protects the switch from liquids and a sensitivity adjustment screw to prevent false tripping of the flow switch. These liquid flow switches serve as a crucial safeguard, preventing damage and potential hazards caused by insufficient or excess liquid flow. They can be operated at temperatures ranging from 32 to 225 degrees F and can withstand pressures up to 100 psi. These liquid flow switches are integrated with an SPDT switch for monitoring the direction of liquid flow.

StyleModelConnection SizeTypeWetted MaterialsPrice (ex. VAT)
AFS6-11 FNPT7.4 Amps, High Sensitivity SwitchBrass, S/S, Buna N, Viton, PTFE€977.52
BFS6-W-11 FNPTHigh Sensitivity SwitchBrass, S/S, Buna N, Viton, PTFE€1,116.43
CFS61" / 3/4" NPT1/3 HP, General Purpose, Electrically OperatedBrass, EPDM-
RFQ
AFS6-3/43/4 FNPTHeavy-duty, High Sensitivity SwitchBrass, S/S, Buna N, Viton, PTFE€1,051.65
AFS6-W-3/43/4 FNPTHigh Sensitivity SwitchBrass, S/S, Buna N, Viton, PTFE€1,026.30
MCDONNELL & MILLER -

Series AF Air Flow Switch

StyleModelMax. Ambient Temp.Price (ex. VAT)
AAF3275 F€482.99
AAFE-1275 F€2,578.32
AAF2300 F-
RFQ
MCDONNELL & MILLER -

Series FS5 Switch Liquid Flow

StyleModelConnection SizeItemMax. Fluid Temp.TypePrice (ex. VAT)
AFS5-11 FNPTFlow Switch250 F1/3 HP, General Purpose, Electrically Operated€648.46
BFS51" NPT-225 F1/3 HP, General Purpose, Electrically Operated-
RFQ
AFS5-3/43/4 FNPTLiquid Flow Switch250 FGeneral Purpose Switch€612.06
MCDONNELL & MILLER -

Series FS25 General Purpose Flow Switch

StyleModelPrice (ex. VAT)
AFS251€385.46
BFS254€527.14
MCDONNELL & MILLER -

Series FS7 Switch Liquid Flow

StyleModelItemMax. PressureTypeWetted MaterialsPrice (ex. VAT)
AFS7-4SDual Head Drench Hose1000 psiIndustrial/Heavy-dutyS/S, PTFE€1,804.42
BFS7-4SWFlow Switch1000 psiIndustrial/Heavy-duty SwitchS/S, PTFE€2,102.57
CFS7-4WFlow Switch300 psiIndustrial/Heavy-duty SwitchBrass, S/S, Bronze, PTFE€1,204.32
DFS7-4EFlow Switch300 psiIndustrial/Heavy-duty SwitchBrass, S/S, Bronze, PTFE€1,418.34
PROSENSE -

FSD Series Flow Switches

StyleModelPrice (ex. VAT)
AFSD1-AP-26H€392.39
BFSD75-AP-6H€325.56

Flow Switches

Flow switches are primarily designed to monitor the air, steam or liquid flow and send signals to the pump for automatic ON / OFF switching with the rise and fall of water level; ideal for regulating water cooling equipment and water treatment or hydronic heating systems. Raptor Supplies offers a wide range of these liquid flow switches from brands like Bradley, Dwyer Instruments, Mcdonnell & Miller, Dayton, Johnson Controls, Gems Sensors and Taco. Gems Sensors flow switches uses 100-micron filtration technology and are less susceptible to clogging than other high-pressure inline flow switches. These units come equipped with one-piece magnetic composite piston which actuates the sealed reed switch when displaced by the pressure difference in fluid flow, thereby activating remote alarms or indicators. They are available in brass, polypropylene and stainless steel construction with a maximum pressure rating and flow rate of 1500 psi and 2 GPM, respectively. Taco industrial flow switches feature flow sensitivity adjustment mechanism for setting a wide adjustment range to start or stop an electronically operated device when flow / no-flow condition occurs. These low-flow switches come with a highly malleable EPDM seal providing anti-hardening, cracking and leakage properties and improving the performance in high-pressure applications such as chillers, boilers, heating systems and water systems. They are available in NEMA 1 and NEMA 4 rated enclosures providing protection against the ingress of foreign contaminants and are ideal for use with 1 - 8 inch (outer diameter) pipe sizes.

Working Mechanism

  • The flow switch contains a sensor element positioned within the fluid's flow route.
  • When fluid flows through the sensor element, it exerts a force or causes a pressure differential.
  • The flow switch has an adjustable actuation threshold, which is the predetermined flow rate or pressure level that must be exceeded for the switch to activate.
  • The force or pressure on the sensor element causes a mechanical or electrical response within the flow switch when the fluid flow reaches or exceeds the actuation threshold.
  • When a flow switch is activated, it produces an output signal that can be used to initiate control functions, such as activating an alarm, opening or closing valves or commencing a shutdown sequence.

Frequently Asked Questions

How can I maintain the accuracy of my flow switch over time?

  • Regularly clean the flow switch and inspect it for any signs of damage, corrosion or debris buildup.
  • Verify that the flow switch is properly aligned within the flow path to ensure accurate measurements.
  • Periodically calibrate the flow switch to verify its accuracy.
  • Take into account the properties of the fluid being monitored, such as viscosity or density, as these factors can impact the accuracy of the flow switch.
  • Be aware of the ambient conditions surrounding the flow switch. Consider protective enclosures for use in harsh environments.
  • Maintain a record of the flow switch's calibration dates, maintenance activities and any observed issues.

What is the difference between a flow switch and a pressure switch?

A flow switch measures the flow rate of media flowing through a process line, whereas a pressure switch measures the pressure within a process line, pipe or vessel.

How do I select the right flow switch for my application?

Consider factors like the type of fluid, flow rate, operating conditions (temperature or pressure) and pipe size.

Do these flow switches require regular maintenance?

These flow switches require minimal maintenance. However, periodic inspection and cleaning are necessary to ensure proper functioning.

Can I use these flow switches for both liquids and gases?

Yes, these flow switches can be used to detect the flow of both liquids and gases.

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