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Series-401
Liquid Level Controls, 600 psi, 500 °F, 12 ft Depth, Adjustable, Alarm
- Installed via top-flanged mount into tanks/sumps; supports installations to ~12 ft depth
- Rated for up to 600 psi and 500 °F; handles high-pressure and high-temperature fluid environments
- Configurable for single-stage (pump control) or two-stage (alarm/shutdown) operation
- Supports fluids with specific gravities down to ~0.50 and offers mercury or snap-action switch options
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Product Overview
The Series-401 Top-Mount Float-Type Level Control offers robust, versatile level sensing and control in demanding tank, vessel, or sump applications. Designed for both non-pressurized and pressurized systems (up to 600 psi) and temperatures up to 500 °F, it supports depths up to 12 ft via guide-rod assemblies.
Choose from single-stage configurations (ideal for pump ON/OFF control) or two-stage variants (ideal for pump plus high/low alarm or shutdown). Float, rod, and stop materials are selected to match specific gravity, fluid type, and conditions - making it suitable for oil refineries, chemical plants, power generating stations, and other industrial uses.
Installation is via a top-mount flange offering multiple flange sizes and materials (e.g., 125# or 150# cast iron, 303 SS rod or 316 SS stops) and guide-rod lengths from 4 to 12 ft. The field-adjustable operating point and deadband settings allow precise configuration for pump control, alarm or shutdown functionality.
Switch options include mercury-or snap-action contacts, with enclosures available in general-purpose, weather-tight or explosion-proof ratings. The ability to handle fluids with specific gravities down to 0.50 (depending on float/rod combination) further extends its applicability across light oils and various liquids.
The Series-401 provides a reliable, configurable solution for high-pressure/high-temperature level control needs where precision float-rod sensing, flexible deadband setting, and robust construction are required.
PDFs & Manuals
Show Ratings & Reviews
| 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 | ||||||||
| 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 | |||||||||
| 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 | |||||||||
| 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 | |||||||||
| 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 | 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