Catalogs > Industrial Controls Catalog > Condition Sensing Switches and Controls > Float
Float
| Introduction |  |
Standards Compliance and Certifications | |
Introduction | |
Technical Data | |
Ordering Information | |
| Product Selection | |
Modifications | |
Ordering Accessories | |
Approximate Dimensions | |
|
| Style A¬ — Tank or Sump Operation | |||||||||
| Maximum Horsepower Ratings | Type 1 Enclosure | Type 4 Enclosure (Fiberglass Polyester) |
Type 7 & 9 EnclosureT | ||||||
| Single-Phase AC | 2 or 3-Phase AC | DC | |||||||
| 115V | 230V | 115V | 230/460/575V | 32V | 115V | 230V | Cat. No. | Cat. No. | Cat. No. |
| 1 | 1 | — | — | 0.25 | 0.25 | 0.125 | 840-A1¬ | 840-A4¬ | 840-A7¬ |
|
| Style B — Tank or Sump Operation | |||||||||
| Maximum Horsepower Ratings | Type 1 Enclosure | Type 4 Enclosure (Fiberglass Polyester) |
Type 7 & 9 EnclosureT | ||||||
| Single-Phase AC | 2 or 3-Phase AC | DC | |||||||
| 115V | 230V | 115V | 230/460/575V | 32V | 115V | 230V | Cat. No. | Cat. No. | Cat. No. |
| 1.5 | 3 | — | 2 | — | 1 | 1 | 840-B1 | 840-B4 | 840-B7 |
|
| Style C — Tank or Sump Operation | |||||||||
| Maximum Horsepower Ratings | Type 1 Enclosure | Type 4 Enclosure (Fiberglass Polyester) |
Type 7 & 9 EnclosureT | ||||||
| Single-Phase AC | 2 or 3-Phase AC | DC | |||||||
| 115V | 230V | 115V | 230/460/575V | 32V | 115V | 230V | Cat. No. | Cat. No. | Cat. No. |
| 1.5 | 3 | 3 | 5 | — | 2 | 2 | 840-C1 | 840-C4 | 840-C7 |
|
| Style D — Tank or Sump Operation | |||||||
| Maximum Horsepower Ratings | Type 1 Enclosure | ||||||
| Single-Phase AC | 2 or 3-Phase AC | DC | |||||
| 115V | 230V | 115V | 230/460/575V | 32V | 115V | 230V | Cat. No. |
| 1.5 | 2 | 2 | 3 | 0.25 | 0.5 | 0.5 | 840-D1 |
| Style DS — Tank or Sump Operation | |||||||
| Maximum Horsepower Ratings | Type 1 Enclosure | ||||||
| Single-Phase AC | 2 or 3-Phase AC | DC | |||||
| 115V | 230V | 115V | 230/460/575V | 32V | 115V | 230V | Cat. No. |
| 1.5 | 2 | 2 | 3 | 0.25 | 0.5 | 0.5 | 840-DS1 |
| ¬ Style A devices are supplied with 1 N.O. and 1 N.C. contact. For 2 N.O. contacts, add Suffix Code 1 to the catalog number. For 2 N.C. contacts, add Suffix Code 2 to the catalog number. | |||||||
| T Class I Groups C, D. Class II Groups E, F, G | |||||||
Float Operator Assemblies
A Float Operator Assembly must be included with the basic device for the float switch to operate. Select and specify a catalog number that meets your requirements. Select modifications and accessories to the Float Operator Assembly from tables on Ordering Modifications.
All Allen-Bradley Float Operator Assemblies come equipped with a number of plated steel or stainless steel assembly parts to allow wall or floor mounting and to accommodate different tank or sump depths. The plated steel and stainless steel assembly parts are made of the material listed in the table below.
Operator Assembly Parts Material
| Stainless Steel | |
| Assembly Part | Material |
| 3/8 in. Rod | Two 3 ft tubes (Type 304) with coupling (Type 303) |
| Cable | 15 ft Cable, (Type 304) |
| Stop Collars | Type 303 |
| Float | Type 304 |
Single Arm Lever
Float is fixed to one end of the rod. Adjustable stop collars at top of the rod operate the switch. The rod may need guides to stabilize vertical float movement. Because of the unlimited number of possible mounting arrangements, guides must be provided by the user. See maximum rod lengths table below.
Base-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Two 3 ft lengths of 3/8 in. tubing with coupling
- Two adjustable stop collars
- One fixed stop collar (with Cat. No. 840-1BCE only when required)
- Stainless Steel Float
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A,D,DS | A | 840-1AD |
| B, C | F | 840-1BCE | |
| 4 | A | A | 840-1AD |
| B, C | F | 840-1BCE | |
| 7 & 9 | A | A | 840-1AD |
| B, C | F | 840-1BCE | |
Floor-Mounted
|
Stainless Steel Operator Assemblies include the following:
- 20 in. of 1 in. pipe
- Two 3 ft lengths of 3/8 in. tubing with coupling
- Two adjustable stop collars
- One fixed stop collar (with Cat. Nos. 840-2BC1, -2B47, -2C47 only when required)
- Stainless Steel Float
- Floor mounting bracket
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-2A1 |
| B, C | F | 840-2BC1 | |
| 4 | A | A | 840-2A47 |
| B | F | 840-2B47 | |
| C | F | 840-2C47 | |
| 7 & 9 | A | A | 840-2A47 |
| B | F | 840-2B47 | |
| C | F | 840-2C47 | |
| Maximum Rod Lengths | |
| Style | Stainless Steel |
| A | 9 ft |
| B | 18 ft |
| C | 18 ft |
| D, DS | 9 ft |
Double Arm Lever
The double arm has a counterweight to offset weight of rod and float. The float moves up and down between stops on the rod so that large changes in liquid level only move the rod a short distance. Top of the rod is fixed to switch lever. The rod may need user-provided guides to stabilize vertical float movement. See Maximum Rod Lengths table below.
Base-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Half Arm Lever (when required)
- Double Arm Lever
- Counterweight
- Two 3 ft lengths of 3/8 in. tubing with coupling
- Three adjustable stop collars
- One fixed stop collar
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-6A1 |
| B, C | F | 840-6BCE | |
| 4 | A | A | 840-6A1 |
| B, C | F | 840-6BC47 | |
| 7 & 9 | A | A | 840-6A47 |
| B, C | F | 840-6BCE47 | |
Floor-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Half Arm Lever (when required)
- Double Arm Lever
- Counterweight
- Floor mounting bracket
- 20 in. of 1 in. pipe
- Two 3 ft lengths of 3/8 in. tubing with coupling
- Three adjustable stop collars
- One fixed stop collar
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-7A1 |
| B | F | 840-7BC1 | |
| C | F | 840-7C47 | |
| 4 | A | A | 840-7A1 |
| B | F | 840-7BC1 | |
| C | F | 840-7C47 | |
| 7 & 9 | A | A | 840-7A47 |
| B | F | 840-7B47 | |
| C | F | 840-7C47 | |
Double Parallel Arms
Used with unguided rods up to 33 ft long. The float moves up and down between stops on the rod so that large changes in liquid level only move the rod a short distance. Parallel levers keep the rod vertical and help limit sideways movement. Top of the rod is fixed to switch lever. See Maximum Rod Lengths table below.
Base-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Additional Double Arm Levers
- Counterweight
- Two 3 ft lengths of 3/8 in. tubing with coupling
- One adjustable stop collar
- One fixed stop collar
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-8A1 |
| B | F | 840-8B1 | |
| C | F | 840-8C1 | |
| 4 | A | A | 840-8A4 |
| B | F | 840-8B4 | |
| C | F | 840-8C47 | |
| 7 & 9 | A | A | 840-8A47 |
| B | F | 840-8B47 | |
| C | F | 840-8C47 | |
Floor-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Additional Double Arm Levers
- Counterweight
- Floor mounting bracket
- 20 in. of 1 in. pipe
- Two 3 ft lengths of 3/8 in. tubing with couplings
- One adjustable stop collar
- One fixed stop collar
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-9A1 |
| B | F | 840-9B1 | |
| C | F | 840-9C1 | |
| 4 | A | A | 840-9A4 |
| B | F | 840-9B4 | |
| C | F | 840-9C47 | |
| 7, 9 | 7, 9 | A | 840-9A47 |
| B | F | 840-9B47 | |
| C | F | 840-9C47 | |
| Maximum Rod Lengths | |
| Style | Stainless Steel |
| A, B, C | 33 ft |
¬ See Float Size Table, Float Size Table.
Double Arm Lever, Double Pulley
A cable runs over a self-supported double pulley. The cable has a float fixed at one end and a counterweight at the other end. Adjustable stop collars on the cable move the switch operating lever.
Base-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Double Pulley Bracket
- 15 ft cable/cast iron counterweight assembly
- Two adjustable stop collars
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | B, C | F | 840-4BC1 |
| 4 | B | F | 840-4B4 |
| C | F | 840-4C4 | |
| 7 & 9 | A | A | 840-4A47 |
| B, C | F | 840-4BC47 | |
Floor-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Double Arm Bracket
- Floor mounting bracket
- 20 in. of 1 in. pipe
- 15 ft cable/cast iron counterweight assembly
- Two adjustable stop collars
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | B, C | F | 840-5BC1 |
| 4 | B | F | 840-5B4 |
| C | F | 840-5C47 | |
| 7 and 9 | A | A | 840-5A47 |
| B | F | 840-5B47 | |
| C | F | 840-5C47 | |
Double Arm Lever, Single Sheave Wheel
Used with Style A switch only. A cable runs over a single pulley mounted on top of float switch. The cable has a float fixed at one end and a counterweight at the other end. Adjustable stop collars on the cable move the switch operating lever.
Base-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Pulley Assembly
- 15 ft cable/cast iron counterweight assembly
- Two adjustable stop collars
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-4A1 |
| 4 | A | A | 840-4A4 |
Floor-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Pulley Assembly
- Floor mounting bracket
- 20 in. of 1 in. pipe
- 15 ft cable/cast iron counterweight assembly
- Two adjustable stop collars
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A | A | 840-5A1 |
| 4 | A | A | 840-5A4 |
¬ See Float Size Table, Float Size Table.
Single Arm Lever, Separate Pulleys
A cable runs over two pulleys which are separate from the switch. The cable has a float fixed at one end and a counterweight at the other end. Adjustable stop collars on the cable move the switch operating lever.
Base-Mounted
|
Stainless Steel Operator Assemblies include the following:
- Two pulleys for separate mounting
- 15 ft cable/cast iron counterweight assembly
- Two adjustable stop collars
- Stainless Steel Float
Switch ordered separately. See Product Selection.
| Type | Style | Stainless Steel | |
| ¬ | Cat. No. | ||
| 1 | A, D, DS | A | 840-3AD |
| B, C | F | 840-3BCE | |
| 4 | A | A | 840-3AD |
| B, C | F | 840-3BCE | |
| 7 & 9 | A | A | 840-3AD |
| B, C | F | 840-3BCE | |
| ¬ See Float Size Table below. | |||
Float Size Table
| Type | Sphere Diameter | Elongated Sphere Diameter x Length |
| A | 6 in. | — |
| F | — | 7 in. x 12.5 in. |
| Note: Float size dimensions do not imply that Float Operator Assemblies can be interchanged. | ||