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GEMS SENSORS Flow Switches

93 results found that include 93 products

An efficient flow switch from Grainger can accurately monitor the flow of air, steam or liquid, then send a signal to a pump to turn itself on or itself shut off. Liquid flow switches can be used to help regulate systems such hydronic heating, plumbing, water cooling equipment, liquid transfer, water treatment and more. Air flow switches can be used to help operate cleanroom filter systems, duct type heating, air ventilating and more. Shop Grainger for dependable flow switches!Close

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  • 1/4 FNPT Piston Liquid Flow Switch, 0.1 gpm
    1/4 FNPT Piston Liquid Flow Switch, 0.1 gpm
    • GEMS SENSORS
    • Item # 1ALG2
    • Mfr. Model # FS-927 70820
    • Liquid Flow Switch, Piston, Flow Rate 0.1 GPM, Connection Size (In.) 1/4 FNPT, Min. Ambient Temp. -20 F, Max....More

  • 1/4 FNPT Rotor Liquid Flow Switch, 0.1 to 5 gpm
    1/4 FNPT Rotor Liquid Flow Switch, 0.1 to 5 gpm
    • GEMS SENSORS
    • Item # 1AMB2
    • Mfr. Model # RFS 155425
    • Liquid Flow Switch, Rotor, Flow Rate 0.1 to 5.0 GPM, Connection Size (In.) 1/4 FNPT, Min. Ambient Temp. -20...More

  • 1/2 MNPT Piston Liquid Flow Switch, 0.5 gpm
    1/2 MNPT Piston Liquid Flow Switch, 0.5 gpm
    • GEMS SENSORS
    • Item # 4JPH9
    • Mfr. Model # FS-150 NO 0.5GPM
    • Liquid Flow Switch, Piston, Flow Rate 0.5 GPM, Connection Size (In.) 1/2 MNPT, Switch Enclosure...More

  • 1/2 FNPT Rotor Liquid Flow Switch, 1.5 to 20 gpm
    1/2 FNPT Rotor Liquid Flow Switch, 1.5 to 20 gpm
    • GEMS SENSORS
    • Item # 1AMB5
    • Mfr. Model # RFS 156268
    • Liquid Flow Switch, Rotor, Flow Rate 1.5 to 20.0 GPM, Connection Size (In.) 1/2 FNPT, Min. Ambient Temp. -20...More

  • 1 MNPT Paddle Liquid Flow Switch, 15 to 48 gpm
    1 MNPT Paddle Liquid Flow Switch, 15 to 48 gpm
    • GEMS SENSORS
    • Item # 1AKZ6
    • Mfr. Model # FS-550 29608
    • Liquid Flow Switch, Paddle, Flow Rate 15-48 GPM, Connection Size (In.) 1 MNPT, Min. Ambient Temp. -30 F, Max....More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.5 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.5 gpm
    • GEMS SENSORS
    • Item # 1ALV9
    • Mfr. Model # FS-380 168433
    • Liquid Flow Switch, Piston, Flow Rate 0.5 GPM, Connection Size (In.) 3/8 MNPT, Min. Ambient Temp. -20 F, Max....More

  • 3/4 FNPT Shuttle Liquid Flow Switch, 0.5 gpm
    3/4 FNPT Shuttle Liquid Flow Switch, 0.5 gpm
    • GEMS SENSORS
    • Item # 1ALA1
    • Mfr. Model # FS-500 170232
    • Liquid Flow Switch, Shuttle, Flow Rate 0.5 GPM, Connection Size (In.) 3/4 FNPT, Max. Ambient Temp. 212 F,...More

  • 1 FNPT Shuttle Liquid Flow Switch, 1 to 6 gpm
    1 FNPT Shuttle Liquid Flow Switch, 1 to 6 gpm
    • GEMS SENSORS
    • Item # 1ALD5
    • Mfr. Model # FS-200 26615
    • Liquid Flow Switch, Shuttle, Flow Rate 1.0 to 6.0 GPM, Connection Size (In.) 1 FNPT, Min. Ambient Temp. -20...More

  • 3/4 FNPT Rotor Liquid Flow Switch, 5 to 30 gpm
    3/4 FNPT Rotor Liquid Flow Switch, 5 to 30 gpm
    • GEMS SENSORS
    • Item # 1AMB6
    • Mfr. Model # RFS 180395
    • Liquid Flow Switch, Rotor, Flow Rate 5.0 to 30.0 GPM, Connection Size (In.) 3/4 FNPT, Min. Ambient Temp. -20...More

  • 1/4 FNPT Rotor Liquid Flow Switch, 0.1 to 5 gpm
    1/4 FNPT Rotor Liquid Flow Switch, 0.1 to 5 gpm
    • GEMS SENSORS
    • Item # 1AMB4
    • Mfr. Model # RFS 156265
    • Liquid Flow Switch, Rotor, Flow Rate 0.1 to 5.0 GPM, Connection Size (In.) 1/4 FNPT, Min. Ambient Temp. -20...More

  • 1/2 FNPT Rotor Liquid Flow Switch, 1.5 to 20 gpm
    1/2 FNPT Rotor Liquid Flow Switch, 1.5 to 20 gpm
    • GEMS SENSORS
    • Item # 1AMB3
    • Mfr. Model # RFS 155485
    • Liquid Flow Switch, Rotor, Flow Rate 1.5 to 20.0 GPM, Connection Size (In.) 1/2 FNPT, Min. Ambient Temp. -20...More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.15 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.15 gpm
    • GEMS SENSORS
    • Item # 1ALV7
    • Mfr. Model # FS-380 181130
    • Liquid Flow Switch, Piston, Flow Rate 0.15 GPM, Connection Size (In.) 3/8 MNPT, Min. Ambient Temp. -20 F,...More

  • 3/4 FNPT Shuttle Liquid Flow Switch, 1 gpm
    3/4 FNPT Shuttle Liquid Flow Switch, 1 gpm
    • GEMS SENSORS
    • Item # 1ALA3
    • Mfr. Model # FS-500 170233
    • Liquid Flow Switch, Shuttle, Flow Rate 1 GPM, Connection Size (In.) 3/4 FNPT, Max. Ambient Temp. 212 F, Max....More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.25 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.25 gpm
    • GEMS SENSORS
    • Item # 1ALV8
    • Mfr. Model # FS-380 168432
    • Liquid Flow Switch, Piston, Flow Rate 0.25 GPM, Connection Size (In.) 3/8 MNPT, Min. Ambient Temp. -20 F,...More

  • 1 MNPT Paddle Liquid Flow Switch, 15 to 48 gpm
    1 MNPT Paddle Liquid Flow Switch, 15 to 48 gpm
    • GEMS SENSORS
    • Item # 1AKZ4
    • Mfr. Model # FS-550 29609
    • Liquid Flow Switch, Paddle, Flow Rate 15-48 GPM, Connection Size (In.) 1 MNPT, Min. Ambient Temp. -30 F, Max....More

  • 3/4 FNPT Shuttle Liquid Flow Switch, 0.25 gpm
    3/4 FNPT Shuttle Liquid Flow Switch, 0.25 gpm
    • GEMS SENSORS
    • Item # 1AKZ8
    • Mfr. Model # FS-500 170231
    • Liquid Flow Switch, Shuttle, Flow Rate 0.25 GPM, Connection Size (In.) 3/4 FNPT, Max. Ambient Temp. 212 F,...More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.5 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.5 gpm
    • GEMS SENSORS
    • Item # 1ALY6
    • Mfr. Model # FS-380 179993
    • Liquid Flow Switch, Piston, Flow Rate 0.5 GPM, Connection Size (In.) 3/8 MNPT, Min. Ambient Temp. -20 F, Max....More

  • 1 FNPT Rotor Liquid Flow Switch, 8 to 60 gpm
    1 FNPT Rotor Liquid Flow Switch, 8 to 60 gpm
    • GEMS SENSORS
    • Item # 1AMB7
    • Mfr. Model # RFS 181688
    • Liquid Flow Switch, Rotor, Flow Rate 8.0 to 60.0 GPM, Connection Size (In.) 1 FNPT, Min. Ambient Temp. -20 F,...More

  • 1/4 FNPT Piston Liquid Flow Switch, 0.25 gpm
    1/4 FNPT Piston Liquid Flow Switch, 0.25 gpm
    • GEMS SENSORS
    • Item # 1ALG3
    • Mfr. Model # FS-927 70821
    • Liquid Flow Switch, Piston, Flow Rate 0.25 GPM, Connection Size (In.) 1/4 FNPT, Min. Ambient Temp. -20 F,...More

  • 3/8 MNPT Piston Liquid Flow Switch, 1 gpm
    3/8 MNPT Piston Liquid Flow Switch, 1 gpm
    • GEMS SENSORS
    • Item # 1ALV4
    • Mfr. Model # FS-380P 197083
    • Liquid Flow Switch, Piston, Flow Rate 1 GPM, Connection Size (In.) 3/8 MNPT, Max. Ambient Temp. 212 F, Max....More

  • 3/4 FNPT Shuttle Liquid Flow Switch, 5 gpm
    3/4 FNPT Shuttle Liquid Flow Switch, 5 gpm
    • GEMS SENSORS
    • Item # 1ALA7
    • Mfr. Model # FS-500 170235
    • Liquid Flow Switch, Shuttle, Flow Rate 5 GPM, Connection Size (In.) 3/4 FNPT, Max. Ambient Temp. 212 F, Max....More

  • 1/4 FNPT Piston Liquid Flow Switch, 0.5 gpm
    1/4 FNPT Piston Liquid Flow Switch, 0.5 gpm
    • GEMS SENSORS
    • Item # 1ALG4
    • Mfr. Model # FS-927 70822
    • Liquid Flow Switch, Piston, Flow Rate 0.5 GPM, Connection Size (In.) 1/4 FNPT, Min. Ambient Temp. -20 F, Max....More

  • 3/4 FNPT Shuttle Liquid Flow Switch, 0.75 to 4 gp
    3/4 FNPT Shuttle Liquid Flow Switch, 0.75 to 4 gp
    • GEMS SENSORS
    • Item # 1ALA9
    • Mfr. Model # FS-400 26600
    • Liquid Flow Switch, Shuttle, Flow Rate 0.75 to 4.0 GPM, Connection Size (In.) 3/4 FNPT, Min. Ambient Temp....More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.15 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.15 gpm
    • GEMS SENSORS
    • Item # 1ALV1
    • Mfr. Model # FS-380P 209876
    • Liquid Flow Switch, Piston, Flow Rate 0.15 GPM, Connection Size (In.) 3/8 MNPT, Max. Ambient Temp. 212 F,...More

  • 1/4 FNPT Piston Liquid Flow Switch, 1 gpm
    1/4 FNPT Piston Liquid Flow Switch, 1 gpm
    • GEMS SENSORS
    • Item # 1ALG6
    • Mfr. Model # FS-927 70824
    • Liquid Flow Switch, Piston, Flow Rate 1 GPM, Connection Size (In.) 1/4 FNPT, Min. Ambient Temp. -20 F, Max....More

  • 9/16-18 UNF Piston Liquid Flow Switch, 0.1 gpm
    9/16-18 UNF Piston Liquid Flow Switch, 0.1 gpm
    • GEMS SENSORS
    • Item # 1ALB6
    • Mfr. Model # FS-4 122352
    • Liquid Flow Switch, Piston, Flow Rate 0.1 GPM, Connection Size (In.) 9/16-18 UNF, Max. Ambient Temp. 225 F,...More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.25 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.25 gpm
    • GEMS SENSORS
    • Item # 1ALY5
    • Mfr. Model # FS-380 179992
    • Liquid Flow Switch, Piston, Flow Rate 0.25 GPM, Connection Size (In.) 3/8 MNPT, Min. Ambient Temp. -20 F,...More

  • 1/2 FNPT Thermal Dispersion Flow Switch, 5 cm/sec
    1/2 FNPT Thermal Dispersion Flow Switch, 5 cm/sec
    • GEMS SENSORS
    • Item # 20X863
    • Mfr. Model # 230500-1-5
    • Flow Switch, Thermal Dispersion, Flow Rate 5 cm/sec, Connection Size 1/2 In FNPT, Max. Ambient Temp. 140...More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.5 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.5 gpm
    • GEMS SENSORS
    • Item # 1ALV3
    • Mfr. Model # FS-380P 197082
    • Liquid Flow Switch, Piston, Flow Rate 0.5 GPM, Connection Size (In.) 3/8 MNPT, Max. Ambient Temp. 212 F, Max....More

  • 3/8 MNPT Piston Liquid Flow Switch, 1 gpm
    3/8 MNPT Piston Liquid Flow Switch, 1 gpm
    • GEMS SENSORS
    • Item # 1ALY1
    • Mfr. Model # FS-380 168434
    • Liquid Flow Switch, Piston, Flow Rate 1 GPM, Connection Size (In.) 3/8 MNPT, Min. Ambient Temp. -20 F, Max....More

  • 1 FNPT Shuttle Liquid Flow Switch, 2 to 8 gpm
    1 FNPT Shuttle Liquid Flow Switch, 2 to 8 gpm
    • GEMS SENSORS
    • Item # 1ALD7
    • Mfr. Model # FS-200 26838
    • Liquid Flow Switch, Shuttle, Flow Rate 2.0 to 8.0 GPM, Connection Size (In.) 1 FNPT, Min. Ambient Temp. -20...More

  • 3/8 MNPT Piston Liquid Flow Switch, 0.25 gpm
    3/8 MNPT Piston Liquid Flow Switch, 0.25 gpm
    • GEMS SENSORS
    • Item # 1ALV2
    • Mfr. Model # FS-380P 197081
    • Liquid Flow Switch, Piston, Flow Rate 0.25 GPM, Connection Size (In.) 3/8 MNPT, Max. Ambient Temp. 212 F,...More

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