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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).

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