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

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).