Magnesonics / Jerguson / Level Switches
External Cage Float Operated Magnetic Level Switch
JBC & JXC Series — Bulletin JS100.03 (April 2017) — A Product of Clark-Reliance
The Jerguson® External Cage Float Operated Magnetic Level Switch uses a unique three-magnet latching mechanism to deliver failure-free performance in high-temperature, high-vibration, and demanding process environments. Endurance tested to over 850,000 cycles without failure — no springs, no cams, no mechanical wear points.
"The new switches are very rugged and dependable, and most importantly, they are mercury-free and safe for the environment… The Jerguson Tri-Magnet Level Switches have been in operation in our facility since May 2007."
— Maintenance Superintendent, Major Utility Power Generation Plant
Key Features
Principle of Operation — Tri-Magnet Mechanism
The switch mechanism is based on a unique three-dimensional magnet design where snap action is accomplished through magnetic repulsion and attraction — eliminating springs and all other mechanical elements prone to failure.
The primary magnet mounted on the float rod causes the secondary magnet to rotate as it passes up and down. The tertiary switch magnet is repelled by the secondary and snaps to the opposite side, causing the cradle to pivot and moving the push rods to operate the switch contacts. The result is positive snap-action interlock switching with no springs and no spring problems.
Switch Mechanism Selection
| Type | Application |
|---|---|
| X4, X8 | General purpose — 10 amp mechanisms for general purpose duties up to 480°F |
| D4, D8 | High temperature — 5 amp mechanisms for high temperature applications up to 750°F |
| H4, H8 | Hermetically sealed — 5 amp mechanisms suitable for temperatures up to 480°F, contaminated atmosphere environments and intrinsically safe circuits. All moving parts and contacts enclosed in an inert gas-filled stainless steel enclosure. |
| P4, P8 | Low current — 0.25 amp gold-plated contact switch mechanism for use in intrinsically safe or low-power circuits up to 750°F |
| E4, E8 | Encapsulated — 5 amp switch mechanism sealed/encapsulated inside an aluminum housing, suitable for temperatures to 850°F |
Switch Contact Configurations
| Contact Type | Switch Types | Configuration | Operation |
|---|---|---|---|
| 4 Contact | D4, X4, P4, H4, E4 | 2 × SPST | AA Make on Rise; BB Make on Fall |
| 8 Contact | D8, X8, P8, H8, E8 | 4 × SPST | AA Make on Rise; BB Make on Fall |
4-contact types can be linked for SPDT/SPCO operation. 8-contact types can be linked for DPDT/DPCO operation.
Float Chamber Construction & Applications
The flanged chamber construction makes these vertical controls a highly serviceable level control solution for petrochemical, power generation, and OEM applications. Chambers are designed to ASME B31.1 (Power Piping Code) and ASME B31.3 (Chemical Plant and Petroleum Refinery Piping Code).
Construction
- →ASME B16.5 Weld Neck Flanges
- →Reinforced Branch Connections
- →All Full Penetration Welds
Options
- →Stainless Steel Chamber
- →Low Temperature Chamber below -20°F
- →High Temperature Chrome-Moly Chamber
- →Certified to B31.1 or B31.3
- →NDT: Radiographic, Ultrasonic, Magnetic Particle, Dye Penetrant
- →Epoxy Paint Finish (FP-18)
- →Extended NEMA 4 Switch Enclosure Housing (up to 3 SPDT or 3 DPDT)
- →Vent Connection
- →Specific Gravity Below 0.35
- →NACE Specification MR-0175
Dimensional Data (inches)
All flange nipples are 1" NPS as standard. All dimensions are for reference only and must be certified upon order.
| Model | A Single NPT/SW | A Multi NPT/SW | A Single Flanged | A Multi Flanged | B NPT/SW | B Flanged | C1 Hi Alarm | C2 Multi-Switch | D Deadband | E C-C | F Type B | F Type X |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JBC1F & JXC1F | 8-1/2" | 11-1/2" | 14" | 17" | 3-1/4" | 6" | 2" | 5" | 0.56" | 14" | 5-1/2" | 5-3/4" |
| JBC2F & JXC2F | 10" | 13" | 14" | 17" | 3-3/4" | 6-1/2" | 2" | 5" | 0.56" | 14" | 6" | 6" |
| JBC3F & JXC3F | 10" | 13" | 14" | 17" | 3-3/4" | 6-1/2" | 2" | 5" | 0.56" | 14" | 6" | 6-11/16" |
| JBC4F & JXC4F | 10" | 13" | 14" | 17" | 3-3/4" | 6-1/2" | 2" | 5" | 0.56" | 14" | 6" | 8-1/16" |
| JXC5F | 10" | 13" | 14" | 17" | 3-3/4" | 6-1/2" | 2" | 5" | 0.56" | 14" | 6" | 8-1/16" |
| JBC5F | 9-1/2" | 12-1/2" | 14" | 17" | 4-1/4" | 7-1/2" | 2" | 5" | 0.56" | 14" | 6-1/2" | 8-1/16" |
| JBC6F & JXC6F | 10" | 13" | 14" | 17" | 4-3/4" | 7-1/2" | 2" | 5" | 0.56" | 14" | 7" | 6-9/16" |
| JBC7F & JXC7F | 10" | 13" | 14" | 17" | 4-3/4" | 7-1/2" | 2" | 5" | 0.56" | 14" | 7" | 7-3/8" |
| JBC8F & JXC8F | 10" | 13" | 14" | 17" | 4-3/4" | 7-1/2" | 2" | 5" | 0.56" | 14" | 7" | 8-1/4" |
| JBC9F & JXC9F | 12-1/2" | 15-1/2" | 16" | 19" | 5-3/4" | 8-1/2" | 2" | 5" | 0.56" | 14" | 7-1/2" | 7-3/16" |
Materials of Construction
Designed in accordance with ASME B31.1 & B31.3. Pressure tested to 1.5× maximum working pressures.
| Component | Carbon Steel Chamber | Stainless Steel Chamber |
|---|---|---|
| Chamber Pipe | ASTM A106 Gr B | ASTM A312 316 |
| Top/Bottom Caps | ASTM A234 | ASTM A403 WP-316 |
| Flanges/Fittings | ASTM A105 | ASTM A182 F316 |
| Studs | ASTM A193-B7 | ASTM A193-B7* |
| Nuts | ASTM A194-2H | ASTM A194-2H |
| Float & Trim | 316 SS | 316 SS |
Process Connection Options
Configuration
| Code | Configuration |
|---|---|
| 1 | Side and Bottom |
| 2 | Side and Side with Drain |
Size
| Code | Size |
|---|---|
| 0 | 0.50" (DN15) |
| 1 | 0.75" (DN20) |
| 2 | 1.00" (DN25) |
| 3 | 1.25" (DN32) |
| 4 | 1.50" (DN40) |
| 5 | 2.00" (DN50) |
| 6 | 2.50" (DN65) |
| 7 | 3.00" (DN80) |
| Omitted | Replacement Head Assembly |
Style
| Code | Style |
|---|---|
| F | FNPT |
| M | MNPT |
| S | FSW |
| P | Plain-End / MSW (Sch 80) |
| 1 | 150# RFSO ASME |
| 3 | 300# RFSO ASME |
| 6 | 600# RFSO ASME |
| 9 | 900# RFSO ASME |
| 0 | 1500# RFSO ASME |
| Omitted | Replacement Head Assembly |
Design Options
| Code | Description |
|---|---|
| Omitted | Standard Design |
| WN | Weld Neck Flanges |
| SW | Socket Weld Flanges |
| RTJ | Ring Type Joint Flange |
| 3E | 3" Temperature Extension |
| 6F | 6" Temperature Extension with Cooling Fins |
| X | Special Design |
Switch Mechanism Electrical Ratings
| Switch Type | Max Wetside Temp °F | AC VA | AC Max V | AC Amps | DC Watts | DC Max V | DC Res. Amps | DC Ind. Amps |
|---|---|---|---|---|---|---|---|---|
| X4 | 480 | 2000 | 440 | 10 | 50 | 250 | 10 | 0.5 |
| D4 | 750 | 2000 | 440 | 5 | 50 | 250 | 5 | 0.5 |
| H4 | 480 | 2000 | 440 | 5 | 50 | 250 | 5 | 0.5 |
| E4 | 850 | 2000 | 440 | 5 | 50 | 250 | 5 | 0.5 |
| P4 | 750 | 6 | 250 | 0.25 | 3.6 | 250 | 0.25 | 0.1 |
| X8 | 480 | 2000 | 440 | 10 | 50 | 250 | 10 | 0.5 |
| D8 | 750 | 2000 | 440 | 5 | 50 | 250 | 5 | 0.5 |
| H8 | 480 | 2000 | 440 | 5 | 50 | 250 | 5 | 0.5 |
| E8 | 850 | 2000 | 440 | 5 | 50 | 250 | 5 | 0.5 |
| P8 | 750 | 6 | 250 | 0.25 | 3.6 | 250 | 0.25 | 0.1 |
4-Contact Mechanisms: Two independent SPST contact sets — link for SPDT. | 8-Contact Mechanisms: Four independent SPST contact sets — link for DPDT.
Typical Applications
Product Categories
The Jerguson range of liquid level controls is designed for operation in a wide variety of applications — from medium-pressure process vessels to high-pressure steam generators.
| Product Category | Pressure Class | Specific Gravity |
|---|---|---|
| Medium Pressures | ANSI Class 150, 300, 600 | SG 0.40 |
| High Pressures | ANSI Class 900, 1500, 2500 | SG 0.40 |
| Direct Mounting | ANSI Class 150, 300, 600 | SG 0.40 |
Warranty
All mechanical level devices are warranted free of defects in materials and workmanship for five years from the date of original factory shipment. If returned within the warranty period and upon factory inspection the cause is determined to be covered, the device will be repaired or replaced without cost to the purchaser, other than transportation.
Request Pricing — JBC / JXC External Cage Level Switches
1-201-419-6111 · sales@nciweb.com
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