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    Series 401 Top Mount Float Type Level Control

    Top Mount Float Type Level Control Single or Two Stage for Pump or Alarm, Depth to 12', Specific Gravity to 0.50
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    Series 401 Top Mount Float Type Level Control

    Single or Two Stage for Pump or Alarm, Depth to 12', Specific Gravity to 0.50

    These heavy duty top-mounted liquid level controls operate in pressurized or non-pressurized tanks and sumps with pressures to 600 psi and temperatures to 500°F. They can be ordered to operate at depths to 12 feet with a 12 foot guide rod. Adjustable in single stage and two stage operation to provide action such as operating a pump; pump and high alarm or shutdown; pump and low alarm, or high and low alarm; or high, high alarm; or low, low alarm. Alarm functions can also be used as shutdowns. Series 401 is available in mercury or snap action contact switches. Specific gravity applications from 0.5 to 1.0.

    Product Applications

    • Oil Refineries
    • Chemical Plants
    • Power Generating Stations
    • Pumping Stations
    • Sanitary/Waste Water Facilities
    • Tanks and Vessels
    More Information
    Model Chart
    EXAMPLE4011G4810B1.0401STW401-1-G-4810-B-1.0-40-1-STW Top mount Float Type Level Control, NEMA 1 enclosure, Single Stage, adjustable deadband, 3-1/2" x 6" 304SS float, 303SS rod, 316SS stop, 1.0 specific gravity, operating point 40", 5" 125# CI flange, 3-1/2" x 6"float, 4' brass guide rods, with SS tag wired.
    SERIES401        Top Mount Float Type Level Control
    CONSTRUCTION 1       Single stage with adjustable deadband
     2       Two stage, lower stage has adjustable deadband., upper stage has fixed deadband
     3       Two stage, upper stage has adjustable deadband, lower stage has fixed deadband
     4       Two stage, each stage has fixed deadband with adjustable deadband between stages
    ENCLOSURE  G      General Purpose, NEMA 1
      WT      Weather tight, NEMA 1, 2, 3, 4, 4X
      E      Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G, Div. I & II; CSA approved Groups C, D, E, F, G only
      EV      Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G, Div. I & II
    CIRCUITS   48XX     Single Stage Mercury Switch, see chart D
       48XX-XX     Two Stage, Mercury Switch, see chart D
       78XX     Single Stage, Snap Switch, see chart D
       78XX-XX     Two Stage, Snap Switch, see chart E
       78XXHM     Hermetically Sealed Snap Switch, see chart E
       98XX     Single Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart E
       98XX-XX     Two Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart E
    FLOAT,
    ROD AND
    STOP
    MATERIAL    		    0    No Float
        B    3-1/2" x 6" 304SS Float, 303SS Rod, 316SS Stop
        C    4-1/2" Copper Float, 303SS Rod, Brass Stop
        D    4-1/2" 316SS Float, 303SS Rod, 316SS Stop
        E    7" 304SS Float, 303SS Rod, 316SS Stop
    SPECIFIC
    GRAVITY    		     0   No Float, No Specific Gravity
         1.0   1.0 Specific Gravity
         0.72   0.72 Specific Gravity
         0.62   0.62 Specific Gravity
         0.50   0.50 Specific Gravity
    OPERATING
    POINT    		      0  No Float Road
          XX  Operating Point from 13 to 140 Inches
    FLANGE AND
    GUIDE RODS    		       0 No Flange, No Guide Rods
           1 5" 125# CI Flange, 3-1/2" x 6" Float, 4' Brass Guide Rods
           2 5" 125# CI Flange, 3-1/2" x 6" Float, 8' Brass Guide Rods
           3 5" 125# CI Flange, 3-1/2" x 6" Float, 12' Brass Guide Rods
           4 5" 125# CI Flange, 3-1/2" x 6" Float, 4' 303SS Guide Rods
           5 5" 125# CI Flange, 3-1/2" x 6" Float, 8' 303SS Guide Rods
           6 5" 125# CI Flange, 3-1/2" x 6" Float, 12' 303SS Guide Rods
           7 5" 150# CS Flange, 3-1/2" x 6" Float, 4' Brass Guide Rods
           8 5" 150# CS Flange, 3-1/2" x 6" Float, 8' Brass Guide Rods
           9 5" 150# CS Flange, 3-1/2" x 6" Float, 12' Brass Guide Rods
           10 5" 150# CS Flange, 3-1/2" x 6" Float, 4' 303SS Guide Rods
           11 5" 150# CS Flange, 3-1/2" x 6" Float, 8' 303SS Guide Rods
           12 5" 150# CS Flange, 3-1/2" x 6" Float, 12' 303SS Guide Rods
           13 6" 125# CI Flange, 3-1/2" x 6" Float, 4' Brass Guide Rods
           14 6" 125# CI Flange, 3-1/2" x 6" Float, 8' Brass Guide Rods
           15 6" 125# CI Flange, 3-1/2" x 6" Float, 12' Brass Guide Rods
           16 6" 125# CI Flange, 3-1/2" x 6" Float, 4' 303SS Guide Rods
           17 6" 125# CI Flange, 3-1/2" x 6" Float, 8' 303SS Guide Rods
           18 6" 125# CI Flange, 3-1/2" x 6" Float, 12' 303SS Guide Rods
           19 6" 150# CS Flange, 3-1/2" x 6" Float, 4' Brass Guide Rods
           20 6" 150# CS Flange, 3-1/2" x 6" Float, 8' Brass Guide Rods
           21 6" 150# CS Flange, 3-1/2" x 6" Float, 12' Brass Guide Rods
           22 6" 150# CS Flange, 3-1/2" x 6" Float, 4' 303SS Guide Rods
           23 6" 150# CS Flange, 3-1/2" x 6" Float, 8' 303SS Guide Rods
           24 6" 150# CS Flange, 3-1/2" x 6" Float, 12' 303SS Guide Rods
           25 6" 125# CI Flange, 4-1/2" Float, 4' Brass Guide Rods
           26 6" 125# CI Flange, 4-1/2" Float, 8' Brass Guide Rods
           27 6" 125# CI Flange, 4-1/2" Float, 12' Brass Guide Rods
           28 6" 125# CI Flange, 4-1/2" Float, 4' 303SS Guide Rods
           29 6" 125# CI Flange, 4-1/2" Float, 8' 303SS Guide Rods
           30 6" 125# CI Flange, 4-1/2" Float, 12' 303SS Guide Rods
           31 6" 150# CS Flange, 4-1/2" Float, 4' Brass Guide Rods
           32 6" 150# CS Flange, 4-1/2" Float, 8' Brass Guide Rods
           33 6" 150# CS Flange, 4-1/2" Float, 12' Brass Guide Rods
           34 6" 150# CS Flange, 4-1/2" Float, 4' 303SS Guide Rods
           35 6" 150# CS Flange, 4-1/2" Float, 8' 303SS Guide Rods
           36 6" 150# CS Flange, 4-1/2" Float, 12' 303SS Guide Rods
           64 6" 300# CS Flange, 4-1/2" Float, 4' 303SS Guide Rods
           65 6" 300# CS Flange, 4-1/2" Float, 8' 303SS Guide Rods
           37 8" 125# CI Flange, 7" Float, 4' Brass Guide Rods
           38 8" 125# CI Flange, 7" Float, 8' Brass Guide Rods
           39 8" 125# CI Flange, 7" Float, 12' Brass Guide Rods
           40 8" 125# CI Flange, 7" Float, 4' 303SS Guide Rods
           41 8" 125# CI Flange, 7" Float, 8' 303SS Guide Rods
           42 8" 125# CI Flange, 7" Float, 12' 303SS Guide Rods
           43 8" 150# CS Flange, 7" Float, 4' Brass Guide Rods
           44 8" 150# CS Flange, 7" Float, 8' Brass Guide Rods
           45 8" 150# CS Flange, 7" Float, 12' Brass Guide Rods
           46 8" 150# CS Flange, 7" Float, 4' 303SS Guide Rods
           47 8" 150# CS Flange, 7" Float, 8' 303SS Guide Rods
           48 8" 150# CS Flange, 7" Float, 12' 303SS Guide Rods
    OPTIONS        RManual Reset - Single Stage
            R1Manual Reset - Lower Stage 2-Stage Control
            STWSS Tag Wired
            01Breather Only (E-Housing only)
            02Drain Only (E-Housing only)
            12Breather and Drain (E-Housing only)
            14210.40Spec. 14210 for Sch 40
            14210.80Spec. 14210 for Sch 80
            23720Fungus Proofing


    CHART B - FLOAT, FLOAT ROD AND STOPS

    CODE
    SIZE
    MATERIAL
    PRESS/TEMP MAX
    ROD
    STOPS
    A
    3-1/2" X 6" (89 X 152.4 mm)
    304SS Float
    300 psi (21 bar)/500°F (260°C)
    303SS
    Brass
    B
    3-1/2" X 6" (89 X 152.4 mm)
    304SS Float
    300 psi (21 bar)/500°F (260°C)
    303SS 
    316SS
    C
    4-1/2" (114 mm)
    Copper Float
    150 psi (10 bar)/300°F (149°C)
    303SS  
    Brass
    D
    4-1/2" (114 mm)
    316SS Float
    300 psi (21 bar)/500°F (260°C)
    303SS  
    316SS
    E
    7" (178 mm)
    304SS Float
    300 psi (21 bar)/500°F (260°C)
    303SS 
    316SS


    CHART C - FLANGE & GUIDE ROD ASSEMBLY

    3-1/2" x 6" (89 x 152.4 mm) FLOAT
    4-1/2" (114 mm) FLOAT
    7" (178 mm) FLOAT
    CODE
    FLANGE
    SIZE
    GUIDE ROD
    CODE
    FLANGE
    SIZE
    GUIDE ROD
    CODE
    FLANGE
    SIZE
    GUIDE ROD
    LENGTH
    MATERIAL
    LENGTH
    MATERIAL
    LENGTH
    MATERIAL
    1
    5" 125# CI
    4' (1.2 m)
    Brass
    25
    6" 125# CI
    4' (1.2 m)
    Brass
    37
    8" 125# CI
    4' (1.2 m)
    Brass
    2
    5" 125# CI
    8' (2.4 m)
    Brass
    26
    6" 125# CI
    8' (2.4 m)
    Brass
    38
    8" 125# CI
    8' (2.4 m)
    Brass
    3
    5" 125# CI
    12' (3.6 m)
    Brass
    27
    6" 125# CI
    12' (3.6 m)
    Brass
    39
    8" 125# CI
    12' (3.6 m)
    Brass
    4
    5" 125# CI
    4' (1.2 m)
    303SS
    28
    6" 125# CI
    4' (1.2 m)
    303SS
    41
    8" 125# CI
    4' (1.2 m)
    303SS
    5
    5" 125# CI
    8' (2.4 m)
    303SS
    29
    6" 125# CI
    8' (2.4 m)
    303SS
    41
    8" 125# CI
    8' (2.4 m)
    303SS
    6
    5" 125# CI
    12' (3.6 m)
    303SS
    30
    6" 125# CI
    12' (3.6 m)
    303SS
    42
    8" 125# CI
    12' (3.6 m)
    303SS
    7
    5" 150# CS
    4' (1.2 m)
    Brass
    31
    6" 150# CS
    4' (1.2 m)
    Brass
    43
    8" 150# CS
    4' (1.2 m)
    Brass
    8
    5" 150# CS
    8' (2.4 m)
    Brass
    32
    6" 150# CS
    8' (2.4 m)
    Brass
    44
    8" 150# CS
    8' (2.4 m)
    Brass
    9
    5" 150# CS
    12' (3.6 m)
    Brass
    33
    6" 150# CS
    12' (3.6 m)
    Brass
    45
    8" 150# CS
    12' (3.6 m)
    Brass
    10
    5" 150# CS
    4' (1.2 m)
    303SS
    34
    6" 150# CS
    4' (1.2 m)
    303SS
    46
    8" 150# CS
    4' (1.2 m)
    303SS
    11
    5" 150# CS
    8' (2.4 m)
    303SS
    35
    6" 150# CS
    8' (2.4 m)
    303SS
    47
    8" 150# CS
    8' (2.4 m)
    303SS
    12
    5" 150# CS
    12' (3.6 m)
    303SS
    36
    6" 150# CS
    12' (3.6 m)
    303SS
    48
    8" 150# CS
    12' (3.6 m)
    303SS
    13
    6" 125# CI
    4' (1.2 m)
    Brass
    		 
    14
    6" 125# CI
    8' (2.4 m)
    Brass
    15
    6" 125# CI
    12' (3.6 m)
    Brass
    16
    6" 125# CI
    4' (1.2 m)
    303SS
    17
    6" 125# CI
    8' (2.4 m)
    303SS
    18
    6" 125# CI
    12' (3.6 m)
    303SS
    19
    6" 150# CS
    4' (1.2 m)
    Brass
    20
    6" 150# CS
    8' (2.4 m)
    Brass
    21
    6" 150# CS
    12' (3.6 m)
    Brass
    22
    6" 150# CS
    4' (1.2 m)
    303SS
    23
    6" 150# CS
    8' (2.4 m)
    303SS
    24
    6" 150# CS
    12' (3.6 m)
    303SS


    CHARTS D & E - ELECTRICAL CIRCUITS AND RATINGS

    SWITCH TYPE
    SWITCH ACTION
    ELECTRICAL RATINGS IN AMPS
    ORDERING CODE
    AC
    DC
    SINGLE STAGE
    TWO STAGE
    120V
    240V
    440V
    30V
    125V
    250V
    LOWER
    UPPER
    CHART D 
    Mercury Contacts    		SP-ST open on level FALL
    10
    5
    3†
     
    10
    5
    -4820
    -4820
    -20
    SP-ST open on level RISE
    10
    5
    3†
     
    10
    5
    -4821
    -4821
    -21
    SP-DT one switch
    4
    2
    1†
     
    4
    2
    -4810
    -4810
    -10
    SP-DT two switches E.I.*
    10
    5
    3†
     
    10
    5
    -4815
    -4815
    -15
    DP-ST two switches E.I.* open on level FALL
    10
    5
    3†
     
    10
    5
    -4814
    -4813
    -13
    DP-ST two switches E.I.* open on level RISE
    10
    5
    3†
     
    10
    5
    -4813
    -4814
    -14
    DP-DT two SP-DT switches
    4
    2
    1†
     
    4
    2
    -4806
    -4806
    -06
    CHART E 
    snap action contacts    		SP-DT one switch
    12
    5
    3†
     
    0.5**
    0.25**
    -7810
    -7810
    -10
    DP-DT two SP-DT switches
    12
    5
    3†
     
    0.5**
    0.25**
    -7806
    -7806
    -06
    SP-DT one hermetically sealed switch
    5
    5
     
    5**
     
     
    -7810HM
    -7810HM
    -10HM
    DP-DT two hermetically sealed SP-DT switches
    5
    5
     
    5**
     
     
    -7806HM
    -7806HM
    -06HM
    DP-DT two SP-DT switches
    10
    3
     
     
    10‡
    3‡
    -9806
    -9806
    -06
    SP-DT one switch
    10
    3
     
     
    10‡
    3‡
    -9810
    -9810
    -10

    Minimum Specific Gravity:See Dimensional Drawing.
    Temperature Rating:-0°F (-9°C) to 500°F (260°C).
    Switch Type:Snap action or mercury.
    Electrical Rating:See Model Chart.
    Wiring Connections:G, WT or E enclosure, terminal block. EV enclosure, 18" (460 mm) leads.
    Process Connection:Top mount flange.
    Enclosures:G, painted steel and aluminum; WT, painted steel, aluminum and neoprene; E, aluminum; EV, aluminum and neoprene.
    Wetted Parts:See Dimensional Drawing and Model Chart.
    Weights:Electrical head and float assembly only: G, WT 10 lb (4.5 kg); E, EV 14 lb (6.3 kg). Flange only: 49, 17 lb (7.7 kg); 59, 20 lb (9 kg); 69, 27 lb (12.3 kg); 89, 47 lb (21.3 kg). Guide rods assembly: 4 ft (1.2 m), 14 lb (6.4 kg); 8 ft (2.4 m), 28 lb (12.7 kg); 12 ft (3.6 m), 42 lb (19 kg).