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

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

Minimum Specific Gravity:
See Dimensional Drawing.
Temperature Limit:
Ambient Temperature: 212°F (100°C); Process Temperature: -20 to 500°F (-29 to 260°C) See chart.
Temperature Rating:
-0°F (-9°C) to 500°F (260°C).
Switch Type:
Snap action or mercury.
Electrical Rating:
See model chart on catalog page.
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).
Suggested Specifications:
Liquid level control shall be top flange mounted, float operated, with (Brass)(Stainless Steel) guide rod assembly for operation to (4)(8)(12) foot depth. Float and flange shall be sized for intended specific gravity. Operation shall be 401-1 (pump), 401-2 (pump and high alarm), 401-3 (pump and low alarm), 401-4 (high and low alarm), Circuit shall be (SPST) (SPDT) (DPDT) hermetically sealed snap action (mercury) switch. Switch mechanism shall be gravity return. Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosion-proof - vapor proof).

Model Chart

 
EXAMPLE 401 1 G 4810 B 1.0 40 1 STW 401-1-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.
SERIES 401                 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                 R Manual Reset - Single Stage
                R1 Manual Reset - Lower Stage 2-Stage Control
                STW SS Tag Wired
                01 Breather Only (E-Housing only)
                02 Drain Only (E-Housing only)
                12 Breather and Drain (E-Housing only)
                14210.40 Spec. 14210 for Sch 40
                14210.80 Spec. 14210 for Sch 80
                23720 Fungus 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
†Available on special order, change 1st digit in ordering code from 4 to 5 or 7 to 8, i.e., -4820 becomes -5820, -7810 becomes -8810, etc.
‡10 amp inductive (polarized) at 125 VDC.
*Electrically Independent.
**Resistive.

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