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Magnesonics / Jerguson / Level Switches

Top Mount Float Operated Magnetic Level Switch

Name: Jerguson Top Mount Float Operated Magnetic Level Switch
Brand: Jerguson
Availability: InStock

JDC & JDS Series — Bulletin JS100.08 (August 2017) — A Product of Clark-Reliance

The Jerguson® Top Mount 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

→Tri-Magnet Switching for Unparalleled Reliability

→Vibration Resistant — no springs or cams

→316 Stainless Steel Trim throughout

→Multi-Point Alarm capability

→ASME B31.1 & B31.3 Design

→Endurance tested to 850,000+ cycles

→Single or dual-switch models available

→Carbon steel and stainless steel chamber options

→Weatherproof (NEMA 4) and explosionproof (NEMA 4 & 7) enclosures

→FM, Class I, Division 1, Groups B, C & D approval (SA7F)

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 Models	Contact Arrangement	Switching Action
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 mechanisms can be linked for SPDT/SPCO operation. 8-contact mechanisms can be linked for DPDT/DPCO operation.

Dimensional & Operating Level Data

Dimensional drawings illustrate single-switch and dual-switch arrangements of the top-mounted float level switch. Each switch point has a 0.56" (14 mm) deadband. The upper-to-lower switch separation in a dual-switch arrangement is 3.000" (76 mm).

Enclosure Type	Duty	Height G	Conduit Thread	Switch Adjustment	Weatherproof Rating
SA7, SI7	Explosionproof	13-1/4"	1" NPT	3-3/8"	NEMA 4 & 7
SA4	Weatherproof	12"	1" NPT	3-3/8"	NEMA 4

Materials of Construction

Designed in accordance with the requirements of ASME B31.1 & B31.3.

Component	Carbon Steel Mounting Flange	Stainless Steel Mounting Flange
Flanges / Fittings	ASTM A105	ASTM A182 F316
Float & Trim	316 SS	316 SS

→Option: Low Temperature Carbon Steel Chambers

→Option: Controls to Meet NACE Requirements

→Option: A Comprehensive NDT Package

Model Selection — Carbon Steel (JDC_F)

Final pressure rating is the lower of the float rating and the process connection rating. Minimum S.G. values are for approximation only with "Lowest Switch Trip Point" less than 12.00".

Model	SPDT Min. S.G.	DPDT Min. S.G.	Float Rating @ 100°F	Float Rating @ 750°F
JDC1F	0.72	0.80	350 PSIG	275 PSIG
JDC2F	0.60	0.60	300 PSIG	235 PSIG
JDC3F	0.65	0.69	740 PSIG	505 PSIG
JDC4F	0.65	0.69	1440 PSIG	935 PSIG
JDC5F	0.72	0.76	1000 PSIG	780 PSIG
JDC6F	0.36	0.38	300 PSIG	235 PSIG
JDC7F	0.47	0.49	750 PSIG	585 PSIG
JDC8F	0.58	0.60	1000 PSIG	780 PSIG
JDC9F	0.34	0.35	450 PSIG	350 PSIG

Model Selection — Stainless Steel (JDS_F)

Model	SPDT Min. S.G.	DPDT Min. S.G.	Float Rating @ 100°F	Float Rating @ 750°F
JDS1F	0.72	0.80	350 PSIG	275 PSIG
JDS2F	0.60	0.60	300 PSIG	235 PSIG
JDS3F	0.65	0.69	720 PSIG	425 PSIG
JDS4F	0.65	0.69	1440 PSIG	935 PSIG
JDS5F	0.72	0.76	1000 PSIG	780 PSIG
JDS6F	0.36	0.38	300 PSIG	235 PSIG
JDS7F	0.47	0.49	750 PSIG	585 PSIG
JDS8F	0.58	0.60	1000 PSIG	780 PSIG
JDS9F	0.34	0.35	450 PSIG	350 PSIG

Process Connections

Code	Connection Size	CS Rating @ 100°F	SST Rating @ 100°F	Notes
D2M	1" NPT	1000 PSIG	1000 PSIG	Requires internal access to attach float (float is larger than 1" NPT)
D71	3" 150# R.F. ASME	285 PSIG	275 PSIG	Model JDC1F/JDS1F only, unless internal access is available
D73	3" 300# R.F. ASME	740 PSIG	720 PSIG	Model JDC1F/JDS1F only, unless internal access is available
D76	3" 600# R.F. ASME	1480 PSIG	1440 PSIG	Model JDC1F/JDS1F only, unless internal access is available
D91	4" 150# R.F. ASME	285 PSIG	275 PSIG	JDC1F/JDS1F on all nozzle schedules; 2F–4F to Sch. 80S
D93	4" 300# R.F. ASME	740 PSIG	720 PSIG	JDC1F/JDS1F on all nozzle schedules; 2F–4F to Sch. 80S
D96	4" 600# R.F. ASME	1480 PSIG	1440 PSIG	JDC1F/JDS1F on all nozzle schedules; 2F–4F to Sch. 80S
DB1	6" 150# R.F. ASME	285 PSIG	275 PSIG	JDC1F/JDS1F on all nozzle schedules; 6F–9F to Sch. 80S
DB3	6" 300# R.F. ASME	740 PSIG	720 PSIG	JDC1F/JDS1F on all nozzle schedules; 6F–9F to Sch. 80S
DB6	6" 600# R.F. ASME	1480 PSIG	1440 PSIG	JDC1F/JDS1F on all nozzle schedules; 6F–9F to Sch. 80S
D7M	3" MNPT	1000 PSIG	1000 PSIG	Model JDC1F/JDS1F only

Switch Mechanism Electrical Ratings

Switch Type	Wetside Temp. °F	AC VA	AC Max. Volts	AC Amps	DC Watts	DC Max. Volts	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 types: two independent SPST contact sets — link for SPDT. 8-contact types: four independent SPST contact sets — link for DPDT.

Enclosure Types

Code	Duty	Cover Material	Base Material	Pressure Boundary	Screwed Components	Max Switches
SA4N	Weatherproof	Aluminum Alloy	Aluminum Alloy	316 Stainless Steel	To Match Chamber	1–2
SA7F	Explosionproof — FM, Class I, Div. 1, Groups B, C & D	Drawn Steel	Aluminum Alloy	316 Stainless Steel	To Match Chamber	1–2

Ordering Information

Typical Model Number

JDC1F SA4N 1 X4 D71 L09.50

Position	Example Code	Description
Model	JDC1F	Carbon Steel Top Mount Float Switch
Enclosure	SA4N	Weatherproof Enclosure
Number of Switches	1	Single Switch
Switch Mechanism	X4	General Purpose, 4 Contact
Process Connection	D71	3" Class 150 Raised Face ASME
Lowest Switch Trip Point	L09.50	Rising Level, 9.50"

1.Completed Application Design Sheet required (JS200.08).

2.Minimum S.G. values are for approximation only, with "Lowest Switch Trip Point" less than 12.00". Actual minimum S.G. depends on the final design.

3.Final pressure rating of the unit is the lower rating between float and process connection.

4.Specify rising level switch point for a single switch, or upper switch of a multi-switch model. Falling level is 0.56" below rising level.

Typical Applications

→Separators

→Water Sumps

→Compressors

→Scrubbers

→Knock Out Pots

→Fractioning Columns

→Condensers

→Process Vessels

→De-actuators

→Condensate Tanks

→Storage Tanks

→Drainpots

→Service Tanks

→Accumulators

→Header Tanks

→Flush Vessels

→Effluent Sumps & Tanks

→Fuel Tanks

→Heat Exchangers

→Feedwater Heaters

→Lube Oil Tanks

→Surge Drums

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 stated warranty period and upon factory inspection the cause of the claim is determined to be covered, the device will be repaired or replaced without cost to the purchaser, other than transportation.

Request Pricing — Jerguson Top Mount Float Switch

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