Jerguson JB**F Series Instruction manual

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Vertical Float Switch
Installation, Operation & Maintenance Manual
Series JB_ _ F
Series JX_ _ F
Series JD_ _ F
Section: JS500
Bulletin: JS500.03
Date: 2016.04
Supersedes: March 2015
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
TableofContents
PrincipleofOperation 3
SwitchAssemblyIdentification 3
ModelNumber–Part1:SwitchAssembly 4
ModelNumber–Part2:SpareEnclosure&PressureTube 5
ModelNumber–Part3:ConversionKits 5
ElectricalCharacteristics,WiringExamples,&SwitchRatings 6
SwitchMechanisms–SimpleApparatus 7
Installation–Part1:SwitchAssembly 8
Installation–Part2:SpareEnclosure&PressureTube 9
Installation–Part3:ConversionKits 9
InstallationSpecifictoHazardousArea 10
PuttingtheSwitchintoService 11
TakingtheSwitchoutofService 11
Maintenance 11
DimensionalData 12‐13
SwitchingPointAdjustment 13
Bolting:TorqueValues&TighteningSequence 14
SwitchMechanismReplacement 15
Spare/ReplacementParts 15
PartsStore 16
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
2

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Principle of Operation
Switching is achieved with the Jerguson®Tri-Magnet
system, giving snap-action, “latch-on” switching.
Vertical movement of the primary magnet A in a glandless
pressure tube simultaneously actuates magnets B & C to
switch the contacts. The Tri-Magnet system enables the
primary magnet to pass on and actuate switch
mechanisms at other levels. Switch mechanisms already
actuated can not re-set until the return of the primary
magnet actuates the magnet system once again.
The primary magnet A is moved vertically in the pressure
tube by a float mechanism which rises and falls with the
liquid level.
Series JB_ _F
Diagrammatic detail of Tri-Magnet system
Series JX_ _F Series JD_ _F
Switch Assembly
Identification
This manual covers the three
series of switches: JB, JX and
JD as shown opposite. Also
covered in this manual are
replacement enclosures &
pressure tubes, replacement
switches, replacement floats,
as well as conversion kits
(neither pictured). Your switch
has a model number stamped
on the nameplate, examples
of which are shown on pages
4 & 5. From these numbers
you can identify your switch
and turn to the relevant pages
in this manual. As switch
mechanisms are common to
all three series, electrical
characteristics are given on
page 6.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
3
Secondary
switch
mechanism
magnet
Tertiary
switch
mechanism
magnet
Contactpairon
contactblades
‘Primary’magnet
encasedin
316stainlesssteel
316stainlesssteel
Floatmechanism
Glandless316
stainlesssteel
Pressuretube

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
1Standardofferingslisted,butalternatesareallowed.Unlistedalternatesdonotaffecthazardousareasafetycomponents.
2ForChamberDesignStyle“D”,internalaccessmayberequiredtoaffixfloatwhenfloatdiameterexceedsconnection.
3Notavailablewithallofferings,consultfactoryforapplicability.
Model Number - Part 1: SwitchAssembly 1 2
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
4
J=Jerguson®
(Omitted) = Magne-Sonics
TM
B = Bottle/Sealed Chamber
X = Flanged Chamber or Head Ass'y Only
D = Top Mount (No Chamber)
C=CarbonSteel
S = 316 Stnls Steel
H = 1.25Cr - .50Mo
1F,2F,3F,4F,5F,6F,7F,8F,9F
LA4N = Weatherproof NEMA 4 / IP66, Long (1-3 Switches)
SA4N = Weatherproof NEMA 4 / IP66 (Std.) (1-2 Switches)
SA7F = Ex-Proof FM (Std.) (Al Alloy, 1-2 Switches)
SI7F = Ex-Proof FM (Cast Iron, 1-2 Switches)
RA7F = Ex-Proof FM (Short) (Al Alloy, 1 Switch)
1,2,3,4
X4,X8,D4,D8,H4,H8,P4,P8,E4,E8
1 = Side-Bottom ("B" or "X" Chamber Design Style)
2 = Side-Side ("B" or "X" Chamber Design Style)
D = Top Mount ("D" Chamber Design Style)
(Omitted) = Head Ass'y Only (Less Chamber) ("X" Chamber Design Style)
0 = .50" (DN15)
1 = .75" (DN20)
2 = 1.00" (DN25)
3 = 1.25" (DN32)
4 = 1.50" (DN40)
5 = 2.00" (DN50)
6 = 2.50" (DN65)
F=FNPT
M=MNPT
S=FSW
P = Plain-End/MSW (Sch.80)
D
3
= Dual FSW & FNPT (Size 1" Only)
1 = 150#RFSO ANSI = Weld Neck Flanges
3 = 300#RFSO ANSI = Socket Weld Flanges
6 = 600#RFSO ANSI = Schedule 40 Branch
9 = 900#RFSO ANSI
0 = 1500#RFSO ANSI
(Omitted)
Process Conn. Size
(Blank or 1 Alpha-Numeric, Not w/in Ex scope)
Process Conn. Style
(Blank or 1 Alpha-Numeric, Not w/in Ex scope)
Chamber/Process Conn. Mat'l
(A-Z or 0-9, Not w/in Ex scope)
Chamber Design Style
(A-Z, Not w/in Ex scope)
Float
(1F thru 99F, Not w/in Ex Scope)
Electrical Enclosure
Switch Quantity
Switch Mechanism
1F SA7F 1
Process Conn. Orientation
(Blank or 1 Alpha-Numeric, Not w/in Ex scope)
Product Line/Tagging
X4 1 2 1 WN
7 = 3.00" (DN80)
JB C
9 = 4.00" (DN100)
A = 5.00" (DN125)
B = 6.00" (DN150)
(Omitted) = Head Ass'y Only (Less
("X" Chamber Design Style)
(Omitted) = Standard Design
WN
SW
S40
Design Options
(Blank or <27 Alpha-
Numerics, Not w/in Ex Scope)
("X" Chamber Design Style)
RTJ = Ring Type Joint Flange
s
ST
3
= Sure Test
= Head Ass'y Only (Less Chamber) X = Special Design

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
S24867 - -
Product Line/Tagging
J=Jerguson®
M = Magne-Sonics
TM
Pressure Tube Material
S = 316L Stainless Steel
Electrical Enclosure
L = LA4 for Weatherproof NEMA 4 / IP66, (Long) (1-3 Switches)
4 = SA4 for Weatherproof NEMA 4 / IP66 (Std.) (1-2 Switches)
7 = SA7 for Ex-Proof FM (Std.) (Al Alloy, 1-2 Switches)
I = SI7 for Ex-Proof FM (Std.) (Cast Iron, 1-2 Switches)
R = RA7 for Ex-Proof FM (Short) (Al Alloy, 1 switch)
Assembly Options
(Omitted) = Standard Design
ST
4
= Sure Test
ST
J S L
-
Adaptor & Pressure Tube
CL = CS for LA4, Weatherproof NEMA 4 / IP66, (Long) (1-3 Switches)
C4 = CS for SA4, Weatherproof NEMA 4 / IP66 (Std.) (1-2 Switches)
C7 = CS for SA7/SI7, Ex-Proof FM (Std.) (1-2 Switches)
CR = CS for RA7, Ex-Proof FM (Short) (Al Alloy, 1 Switch)
SL = SS for LA4, Weatherproof NEMA 4 / IP66, (Long) (1-3 Switches)
S4 = SS for SA4, Weatherproof NEMA 4 / IP66 (Std.) (1-2 Switches)
S7 = SS for SA7/SI7, Ex-Proof FM (Std.) (1-2 Switches)
SR = SS for RA7, Ex-Proof FM (Short) (Al Alloy, 1 Switch)
Nameplate & Enclosure
JL = Jerguson for LA4, Weatherproof NEMA 4 / IP66, (Long) (1-3 Switches)
J4 = Jerguson for SA4, Weatherproof NEMA 4 / IP66 (Std.) (1-2 Switches)
J7 = Jerguson for SA7, Ex-Proof FM (Std.) (Al Alloy, 1-2 Switches)
JI = Jerguson for SI7, Ex-Proof FM (Std.) (Cast Iron, 1-2 Switches)
JR = Jerguson for RA7, Ex-Proof FM (Short) (Al Alloy, 1 Switch)
ML = MS for LA4, Weatherproof NEMA 4 / IP66, (Long) (1-3 Switches)
M4 = MS for SA4, Weatherproof NEMA 4 / IP66 (Std.) (1-2 Switches)
M7 = MS for SA7, Ex-Proof FM (Std.) (Al Alloy, 1-2 Switches)
MI = MS for SI7, Ex-Proof FM (Std.) (Cast Iron, 1-2 Switches)
MR = MS for RA7, Ex-Proof FM (Short) (Al Alloy, 1 Switch)
Switch Mechanism
X4,X8,D4,D8,H4,H8,P4,P8,E4,E8
Switch Mechanism - 2nd (If Applicable)
X4,X8,D4,D8,H4,H8,P4,P8,E4,E8
(Omitted) = No switch
Switch Mechanism - 3rd (If Applicable)
X4,X8,D4,D8,H4,H8,P4,P8,E4,E8
(Omitted) = No switch
JSCKIT J4 X4 X4 X4C4
Model Number - Part 3: Conversion Kits 15
1Standardofferinglisted,butalternatesareallowed.
2NotavailablewithTopMountChamberDesignStyle(“D”)
3Mustbeusedwithanapprovedswitchtomaintainhazardouslocationrating.
4Notavailablewithallofferings,consultfactoryforapplicability.
5Seeswitchupgradebulletin,JS500.06,forcompleteconversioninstructions.
Model Number - Part 2:Spare Enclosure & Pressure Tube 123
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
5

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
VA Volts Amps Watts Volts Res.
Amps Ind. Amps
X4 & X8 250 Amb. 2000 440 10 50 250 10 0.5
D4 & D8 400 Amb. 2000 440 5 50 250 5 0.5
H4 & H8 250 -100 2000 440 5 50 250 5 0.5
P4 & P8 400 Amb. 6 250 0.25 3.6 250 0.25 0.1
E4 & E8 455 Amb. 2000 440 5 50 250 5 0.5
AC Max. Values DC Max. Values
Temp
Wetside
(°C)
Low
Temp
Use (°C)
Type
Power Factor 0.4mm Time Constant 40ms Max.
Electrical characteristics
4 Contact Type : D4, X4, P4, H4
2X independent SPST
AA make on rise : BB make on fall
8 Contact Type : D8, X8, P8, H8
Double pole double throw
(4X independent SPST)
AA make on rise : BB make on fall
Note: For DPDT operation, installer must
common any one pair of A and B wires in
the terminal block for each of the two ends
of the switch mechanism.
Wiring Examples
Single Switch
As high level alarm
As low level alarm
Pump Control Switch
LLA Switch
A
A
B
B
A
A
B
B
Alarm ON
Alarm ON
Dual Switch: Combined Pump Control
And Low Level Alarm
A
A
B
B
A
A
B
B
Pump ON
Alarm ON
Dual Switch: High and Low Level Alarm
A
A
B
B
A
A
B
B
HLA Switch
LLA Switch
Each switch mechanism has flying leads which are factory wired to
ceramic terminal blocks fixed in the switch enclosure.
Electrical rating
Warning
Gold plating on the contacts of the P4 and P8 switch mechanisms may be
permanently damaged if the mechanisms are used to switch circuits with
values greater than those shown above.
Important wiring notes
1. To minimize electrical shock hazard, before energizing, it is essential
that the equipment is connected to a protective ground using the terminals
supplied.
2. Switches must not be used for the direct starting of motors. Contacts
should be wired in series with the operating coils of relays, contactor
starters or solenoid valves, and fused separately.
3. The temperature of the switch enclosure may at times approach the
temperature of the process and suitable heat resisting cables should
therefore be used, together with appropriate cable glands.
4. A sufficient length of flexible cable should be fitted to allow easy removal
of the switch head and float assembly at any time.
Explosion-proof models
5. Cable entry shall be fitted with an explosion-proof cable entry device, with
or without thread adaptor, and should be used in accordance with all local
and national codes.
6. FM Approved Applications: Copper conductors 60⁰/75 ⁰C: 140⁰/167⁰F
ONLY. Torque terminals to 7in.-lbs (6cm-kg).
7. Ensure the cover locking safety grub screw is replaced and
tightened before energizing.
Two switch pump control circuit using
auxiliary contacts on starter. Note diagram
shows starter fitted with 250V coil for 3-phase
3-wire supply connect coil terminal N to line 1
and fit 440V coil.
Two switch pump control circuit using
‘holding’ relay for starters without
auxiliary contacts.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
6

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
P4, P8, H4, H8 Switch Mechanisms - Simple Apparatus
When used as “Simple apparatus” within a hazardous atmosphere the following should be noted:
1.The product should be installed by suitably trained personnel, in accordance with all applicable local and national codes.
2.As the product has no source of internal heating, the temperature classification is dependent on the ambient air
temperature and the temperature of the process vessel to which it is attached.
3.Materials of construction: Refer to product catalogue or customer drawing for actual material of level switch concerned.
Housing and Cover: Carbon Steel, or Stainless Steel 316 type, or Aluminum Alloy LM25 or LM24
or B85 grade 360, or Cast Iron grade 250
Pressure Tube & Union: Stainless Steel types 316, 321 or 304, or Carbon Steel 220M07 or ASTM A108, or
Alloy NA18, or Alloy C-276 (UNS N10276) or Alloy 625 (UNS N06625), or Alloy 825
(UNS N08825)
If the equipment is likely to come into contact with aggressive substances, it is the responsibility of the user to take suitable
precautions that prevent it from being adversely affected, thus ensuring that the type of protection is not compromised.
Aggressive substances: e.g. acidic liquids or gases that may attack metals or solvents that may affect polymeric materials.
Suitable precautions: e.g. regular checks as part of routine inspections or establishing from the material’s data sheet that it
is resistant to specific chemicals.
4.It is the responsibility of the user to ensure:
a. The joint requirements between the switch housing and vessel are compatible with the process media.
b. The joint tightness is correct for the joint material used.
c. That suitable temperature rated cable is used. Note: The cable entry temperature may exceed 70°C
d. The float is protected from impact or friction, or static electrical build-up from fast flowing non-
conductive fluids, that could generate an ignition source.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
7

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
General Installation Instructions – Part 1: Switch Assembly
Installation shall be carried out by suitably trained personnel in accordance with all local and national codes.
For hazardous area installations, also see ‘Installation Instructions Specific to Hazardous Areas’ section, page 10.
1. Remove all packaging and inspect each switch assembly upon receipt and prior to installation. Careful handling is
required at all times to ensure that any and all electrical enclosure(s), chamber(s), process connection(s) (flange facing,
threading, etc.), exposed float(s) and/or rod(s) are not dirty, damaged, or bent.
2. Check the tag to ensure that both the operating conditions and electrical requirements of the application are within the
ratings of the switch.
3. It is recommended that block/isolation valves be used, installed between the vessel and the switch assembly chamber,
when provided with a chamber.
4. Mount the switch assembly to the process connection(s), ensuring that its’ central line axis is vertical to the eye. Use
suitable gaskets and/or seals for each connection and/or joint, if required, and as dictated by the application. Note (Series
JD_ _F): If float cannot fit through mounting/process connection, it must be unthreaded from the unit prior to installation.
Thread float back onto the unit, using a permanent thread locker, inside of the vessel after the head has been mounted, via
an access panel or similar.
Switch trip point locations.
a) Series JB_ _F & JX_ _F: Refer to page 12 for default switch trip points. Refer to any applicable
documents (purchase order, order acknowledgement, drawings, etc.) for switch assemblies ordered with
non-standard switch trip points.
b) Series JD_ _F: Switch trip points are customer specified. Refer to any applicable documents (purchase
order, order acknowledgement, drawings, etc.) for switch trip points.
Enclosure Cover Removal: Allow for room above the switch assembly to remove enclosure cover. Actual distance
varies by enclosure, see page 13. For electrical enclosure type, refer to model code on pages 4-5.
5. Check torque values for all bolted connection(s), if applicable. Values shall be in accordance with manufacturers
recommendation based on bolting, gasket materials, etc. Reference page 14.
6. Remove the cover to the switch assembly’s electrical enclosure to reveal the terminal block(s) to which electrical
connections are to be made.
Explosion-proof models: Locate and loosen the M5 socket head safety grub screw on the side of enclosure cover,
adjacent to base joint. Place a bar across the top of the cover, locating in the castellations. The cover can now be
unscrewed from the base using the bar as a lever. Secure the base of the switch assembly’s electrical enclosure if
it turns freely with the cover.
Weatherproof models: Loosen the hexagon bolt at the top and remove enclosure cover. Do not completely
remove the bolt, since a retaining washer on the bolt, inside of the enclosure cover, will reduce the risk of loss. If
bolt is removed, reassemble making sure that the fiber sealing washer sits below the bolt head.
7. Connect electrical wiring via the conduit entries using a suitable cable gland. Note that the base of the enclosure is
rotatable on the pressure tube to allow the most convenient orientation of the conduit entry.
Refer to wiring notes on page 6 (all locations), & if applicable, page 7 (hazardous locations) .
8. The lugs of the tab washer directly underneath the base must now be bent over to locate on the most appropriate flats of
the hexagon union. This prevents further rotation of the electrical enclosure base, which protects the integrity of the wiring
and terminal connections, particularly when the electrical enclosure cover is removed or re-fitted.
9. Switch point adjustments may now be made if necessary, see page 13.
10. Check that cover seals in the enclosure base are present and in good condition, and then replace the cover.
Explosion-proof models: Before energizing, ensure the cover locking safety grub screw is replaced and
tightened. Do not energize if the cover locking safety grub screw is missing.
Weatherproof models: Before energizing, ensure that the fiber sealing washer and hexagon bolt were reinstalled
at the top of the cover.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
8

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
General Installation Instructions – Part 2: Spare Enclosure & Pressure Tube
Installation shall be carried out by suitably trained personnel in accordance with all local and national codes.
For hazardous area installations, also see ‘Installation Instructions Specific to Hazardous Areas’ section, page 10.
1. Remove all packaging and inspect each unit upon receipt and prior to installation. Careful handling is required at all times
to ensure that any and all electrical enclosure(s), connection(s) (flange facing, threading, etc.) are not dirty, damaged, or
bent.
2. Check the tag of the spare unit to ensure that any operating conditions and/or electrical requirements of the application
are within the ratings of the switch.
3. De-energize the unit by cutting all power to the electrical components of the unit.
4. Remove the original units’ enclosure cover to reveal the terminal block(s) to which electrical connections are made.
Explosion-proof models: Locate and loosen M5 socket head safety grub screw on side of enclosure cover
adjacent to base joint. Place a bar across the top of the cover, locating in the castellations. The cover can now be
unscrewed from the base using the bar as a lever.
Weatherproof models: Loosen and remove the hexagon bolt and fiber sealing washer at the top of the cover.
5. Remove all terminal and conduit connections. Do not remove switch(es) or change its position on the pressure tube.
6. Take the switch out of service following the instructions on page 11.
7. Remove original units’ pressure tube, with electrical enclosure base still attached, by loosening its threaded connection
atop chamber/vessel. Carefully raise pressure tube, taking care not to bend the float rod, until the stop clip, located below
the pressure tube, is visible.
8. Separate float assembly from pressure tube by removing stop clip. Pinch stop clip to remove, and do not let stop clip/float
assembly to fall into chamber. (Note: The stop tube, which sits on the stop clip, may prevent you from pinching the stop clip
sufficiently to remove it. Stop tube may have to be lifted up into the pressure tube in order to remove.)
9. On the original units’ pressure tube, mark the location of each switch, then remove each switch. Each switch mechanism
is mounted on the pressure tube by a locking screw and nut. These can be loosened, allowing the switch to be removed by
sliding it up and off the pressure tube.
10. Remove new enclosures’ electrical cover according to step 4.
11. Attach the stop clip to the bottom of the new pressure tube. (Note: Pinch stop clip in the absence of the stop tube in
order to sufficiently install.)
12. Fit new pressure tube, with new electrical enclosure, into top threaded connection of chamber and tighten the pressure
tube hex nut.
13. Transfer the switch locations from the original units’ pressure tube onto the new pressure tube, and mount the
switch(es) onto the pressure tube.
14. Connect electrical wiring via the conduit entry using a suitable cable gland. Note that the base of the enclosure is
rotatable on the pressure tube to allow the most convenient orientation of the conduit entry.
Refer to wiring notes on page 6 (all locations), & if applicable, page 7 (hazardous locations) .
15. The lugs of the tab washer directly underneath the base must now be bent over to locate on the most appropriate flats
of the hexagon union. This prevents further rotation of the enclosure base, and is particularly important as it will prevent
rotation when the enclosure cover is removed or re-fitted.
16. Check that cover seals in the enclosure base are present and in good condition, and then replace the cover.
Explosion-proof models: Before energizing, ensure the cover locking safety grub screw is replaced and
tightened. Do not energize if the cover locking safety grub screw is missing.
Weatherproof models: Before energizing, ensure that the fiber sealing washer and hexagon bolt were reinstalled
at the top of the cover.
17. Put switch back into service following steps on page 11.
18. Switch point adjustments may now be made if necessary, see page 13.
General Installation Instructions – Part 3: Conversion Kits
Installation shall be carried out by suitably trained personnel in accordance with applicable codes of practice.
For hazardous area installations, also see ‘Installation Instructions Specific to Hazardous Areas’ section, page 10.
1. Refer to Document JS500.06 for complete conversion instructions.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
9

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Installation Instructions Specific to Hazardous Area
Examples of Model Numbers Covered:
Model Number - Part 1, page 4 : JBC1FSA7F1X410X (“F” indicates FM approval for hazardous locations.)
Model Number - Parts 2 & 3, page 5: S24867-JS#or JSCKIT-C#J#X4 (“#”, when represented by “7”, “I”, or “R”, indicates
FM approval for hazardous locations.)
The following instructions apply to equipment covered by FM File 3058469
Installation of this equipment shall be carried out by suitably trained personnel, in accordance with all local and national
codes.
1. Inspection and maintenance of this equipment shall be carried out by suitably trained personnel, in accordance with all
local and national codes.
2. No maintenance or repair of the flameproof enclosure is permitted.
3. The enclosure must not be opened when the equipment is electrically energized. Where Line Monitoring Resistors are
fitted allow four minutes after isolation before removing cover.
4. The certification of this equipment relies upon the following materials used in its construction:
a. Housing and Cover: Aluminum Alloy LM25 or LM24 or B85 grade 360, or Cast Iron grade 250.
b. Pressure Tube & Union (Partition wall): Stainless Steel types 316, 321 or 304, or Carbon Steel 220M07 or
ASTM A108, or Alloy NA18, or Alloy C-276 (UNS N10276) or Alloy 625 (UNS N06625), or Alloy 825 (UNS
N08825)
i. If the equipment is likely to come into contact with aggressive substances, it is the responsibility of
the user to take suitable precautions that prevent it from being adversely affected, thus ensuring that
the type of protection is not compromised.
ii. Aggressive substances: e.g. acidic liquids or gases that may attack metals or solvents that may affect
polymeric materials.
iii. Suitable precautions: e.g. regular checks as part of routine inspections or establishing from the
material’s data sheet that it is resistant to specific chemicals.
iv. Note: The metallic alloy used for the enclosure material may be at the accessible surface of this
equipment; in the event of rare accidents, ignition sources due to impact and friction sparks could
occur.
5. It is the responsibility of the user to ensure:
a. The voltage and current limits for this equipment are not exceeded.
b. That only suitably certified cable entry devices will be utilized when connecting this equipment.
c. That suitable temperature rated cable is used. Note: The cable entry temperature may exceed 70°C.
d. That any unused cable entries are sealed with suitably certified stopping plugs.
e. The joint requirements between the switch housing and vessel are compatible with the process media.
f. The joint tightness is correct for the joint material used.
g. The float is protected from impact or friction, or electrostatic charging from fast flowing non-conductive fluids,
that could generate an ignition source.
6. Except for input gland, only screws and fittings provided by the manufacturer can be attached to the housing.
7. Technical data:
a. Coding: FM approval: Class I Div. 1 Groups B,C,D T6...T1 (-50°C ≤Ta ≤+60°C)
b. Pressure: Must not exceed the rating of the coupling/flange fitted.
c. Temperature:
i. Ambient Air Temperature (Ta) (-50°C ≤Ta ≤+60°C)
ii. Allowable process temperature (Tp)
d. FM Approval Standards: FM Class 3600:2011,
FM Class 3615:2006, FM Class 3616:2011,
FM Class 3810:2005.
TheTemperatureClassapplicableforeachapplicationisdeterminedbythe
processtemperature(Tp)asshowninthetableabove.
TClass ProcessTemperature(Tp)
T6 ‐50°C TO80°C
T5 ‐50°C TO95°C
T4 ‐50°C TO130°C
T3 ‐50°C TO195°C
T2 ‐50°C TO295°C
T1 ‐50°C TO455°C
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
10

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Putting the Switch into Service
1. Check the tag to ensure that the operating conditions of the application are within the ratings of the switch.
2. Check that any and all valves, plugs, etc. are securely closed. Check torque values for bolting of process connections
and/or switch head flange, if either apply. Values shall be in accordance with manufacturers recommendation based on
bolting, gasket materials, etc. Reference page 14.
3. Slowly bring the switch up to pressure by opening the upper block/isolation valve, or by similar means. Take caution not
to damage the switch if fluid is available to the upper block/isolation valve, or other. As fluid under pressure can be
extremely dangerous.
4. If available, slowly introduce & equalize a liquid level to the switch by opening the lower block/isolation valve, or by
similar means.
Taking the Switch out of Service
1. Isolate the switch from any pressure and/or fluid by closing both the upper and lower block/isolation valves, or by similar
means.
2. Slowly open a vent valve, vent plug, or similar connection to relieve pressure on the switch. If the vent valve or
connection is available to the fluid, take caution as fluid exiting the switch under pressure can be extremely dangerous.
3. Remove any remaining fluid from the chamber using a drain valve, drain plug, or the lowest connection.
Maintenance of the Jerguson®Vertical Float Switch
Inspection and maintenance shall be carried out by suitably trained personnel in accordance with all local and
national codes.
1. Isolate electrical circuits to switch and disconnect wiring as necessary.
a. Series JB_ _F switches: Continue with step 9.
b. Series JX_ _F & JD_ _F switches: Continue with step 2.
2. Take switch out of service, according to the respective section above.
3. Remove top flange nuts holding switch to chamber/vessel and carefully withdraw switch head and float assembly,
taking care not to bend the float rod.
4. Separate float assembly from pressure tube by pinching & removing stop clip. (Note: The stop tube, which sits on the
stop clip, may prevent you from pinching the stop clip sufficiently to remove it. Stop tube may have to be moved into
the pressure tube in order to remove.)
5. Check float, float rod, magnet, sealing surface and gasket for excessive wear and/or damage. Clean and/or replace as
necessary.
6. Inspect the chamber and remove any deposits.
7. Fit replacement joint and reassemble, taking care not to bend the float rod. Firmly tighten nuts on top flange, using bolt
torque values given in tables on page 14.
8. Bring switch into service, according to the respective section above.
9. Remove the switch head cover and examine the switch mechanism body for any damage. Ensure that wiring is in good
order and that all the screws are tight. Dismantling of switch mechanism is not recommended and replacement of
the complete switch mechanism will be found to offer the quickest and most economical solution in event of
faulty operation. See page 15.
10. Check sealing gasket / “O” ring and replace if necessary.
11. Check the cover seals are present and in good condition, and then replace the cover.
a. Explosion-proof models: Before energizing, ensure the cover locking safety grub screw is replaced and
tightened. Do not energize if the cover locking safety grub screw is missing.
b. Weatherproof models: Before energizing, ensure that the fiber sealing washer and hexagon bolt were
reinstalled at the top of the cover.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
11

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
C1 = Single Switch: Process C/L to rising trip point of switch.
= Multi-Switch : Process C/L to rising trip point of upper/high level switch.
C2 = Multi-Switch : Process C/L to rising trip point of lower/low level switch.
D = Switch Deadband. Distance between the switch trip and reset.
G = Enclosure Height. See table on page 13.
+ Default trip locations at minimum operating SG. See ‘Switching Point Adjustment’ section, page 13.
-1F -2F -3F -4F JB_5F JX_5F -6F -7F -8F -9F
Dim D
+
(in)
.56
Dim C1
+
(in)
2.00
Dim C2
+
(in)
5.00
Model
Operating Level Data
Series JB_ _F & JX_ _F
Single Switch
Side-Bottom
SA4 Enclosure
Single Switch
Side-Side
LA4 Enclosure
Multi-Switch
Side-Bottom
RA7 Enclosure
Multi-Switch
Side-Side
SA7/SI7 Enclosure
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
12

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Operating Level Data
Series JD_ _F
Electrical Enclosure
SA4 LA4 SA7 SI7 RA7
Dim G (in) 11.94 15.88 13.25 13.25 9.00
Clearanceǂ(in) 7.25 11.25 6.50 6.50 2.25
JD_ _F units are
custom built for
each application.
The minimum SG
of any unit is
specific to the
application and
final design, based
on the float, the
elevation of the
switch trip point,
and the switch
being used.
ǂClearance above enclosure required to remove cover.
G = Enclosure Height, See table below.
Switching Point Adjustment
Each switch mechanism is mounted on a bracket, which is secured on the pressure tube by a locking screw and lock nut.
These can be loosened, allowing the bracket, and therefore the switch trip point elevation, to be adjusted up or down as
required. Always ensure that the small pressure plate between the locking screw and the pressure tube is in place before
re-tightening the locking screw nut.
Each switch, unless otherwise ordered, is assembled with factory default switch trip points, for the minimum specific gravity
(SG) of the unit. Higher application SG’s will cause the switch to trip sooner, at a lower elevation. Any change made to the
factory default switch positions are done at the customers discretion, and should be tested in the application fluid to ensure
that each switch mechanism can be tripped and also reset.
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
13

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Bolting Torques
Information in this section is to the best of our knowledge correct. Since conditions of use are beyond our switch, users must
satisfy themselves that bolt torques are suitable for their flange/process/conditions/gasket material of the application(s).
Bolt TorqueValues,(Ft.‐Lbs./Nm)
(ForASMEB16.5RaisedFaceFlangeswithlubricatedA193Gr.B7Bolting)
150# 300# 600# 900# 1500#
Compressed
Sheet Graphoil Spiral Wound
Compressed
Sheet Graphoil Spiral Wound
Spiral
Wound
Spiral
Wound
Spiral
Wound
NominalFlangeSize, NPS(DN)
0.50(15) 28/38 20/27 47/64 28/38 20/27 47/64 47/64 100/136 100/136
0.75(20) 40/54 27/37 60/81 51/69 34/46 84/114 84/114 100/136 100/136
1.00(25) 53/72 35/47 60/81 67/91 45/61 115/156 115/156 160/217 160/217
1.50(40) 60/81 60/81 60/81 151/205 101/137 197/267 197/267 266/361 353/479
2.00(50) 120/163 120/163 120/163 108/146 72/98 113/153 113/153 160/217 227/308
3.00(80) 120/163 120/163 120/163 200/271 138/187 200/271 200/271 319/433 451/611
4.00(100) 120/163 120/163 120/163 200/271 196/266 200/271 320/434 572/776 694/941
5.00(125) 200/271 200/271 200/271 200/271 200/271 200/271 490/664 804/1090 970/1315
6.00(150) 200/271 200/271 200/271 200/271 200/271 200/271 490/664 664/900 867/1175
8.00(200) 200/271 200/271 200/271 320/434 320/434 320/434 710/963 1000/1356 1297/1758
Correct 4 and 8 Bolt Pattern Tightening Sequence:
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
14

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
MODEL FLOAT SIZE P/N
JX_1F 2-3/4" OD x 5" Long D-4171-13
JX_2F 3-1/2" OD x 6" Long D-4261-13
JX_3F 3-1/2" OD x 6" Long D-4251-13
JX_4F 3-1/2" OD x 6" Long D-4291-13
JX_5F 3-1/2" OD x 6" Long D-4241-13
JX_6F 5-1/2" OD Sphere D-3361-13
JX_7F 5-1/2" OD Sphere D-3341-13
JX_8F 5-1/2" OD Sphere D-3331-13
JX_9F 7" OD Sphere D-3431-13
SPARE FLOATS
SWITCH SWITCH TYPE P/N
X4 SPDT K-2008-00
D4 SPDT Hi Temp. K-2009-00
H4 SPDT Herm. Sealed K-2011-00
P4 SPDT Gold Plated K-2010-00
E4 SPDT Hi Temp. Encapsulated K-2020-00
X8 DPDT K-2012-00
D8 DPDT Hi Temp. K-2013-00
H8 DPDT Herm. Sealed K-2015-00
P8 DPDT Gold Plated K-2014-00
E8 DPDT Hi Temp. Encapsulated K-2021-00
SPARE SWITCH MECHANISMS
12
Switch Mechanism Replacement
IMPORTANT NOTE
If a spare switch mechanism is fitted at any time, it is important that the magnet system is left in the correct mode.
After installation of a replacement switch mechanism, always check that the B-B contacts are made, assuming the
chamber is empty of liquid. If the chamber is full of liquid, then A-A contacts should be checked to ensure they are made.
If it is found that a switch mechanism is not in the correct mode, and the switch is located on the pressure tube to allow it to
trip in both directions, then the liquid level in the chamber should be raised such that the primary float magnet passes
through the switching point. Lowering the liquid level will then cause the float magnet to fall back through the switching
point, thus leaving the switch mechanism in the correct operating mode. (For a switch operating as low level alarm, the
liquid level should be first lowered then raised back to ensure the switch mechanism is in the correct operating mode).
Full fitting instructions are supplied with each spare or replacement switch mechanism.
TEMPERATURE EXTENSION
Standard, No Temperature Extension
3" Temperature Extension
6" Temperature Extension / Cooling Fins
X9F
1 Switch
3 Switches (Requires LA4N Enclosure)
STANDARD SPARE FLOAT & ROD ASSEMBLY
Base Part Number FLOAT / ROD DESCRIPTION
NUMBER OF SWITCHES
P/N
S23991 CODE
3-1/2" OD x 6" Long, Float w/ Std Length Rod
X8F
X7F
X6F
X5F
X4F
X3F
2 Switches
X2F
X1F 2-3/4" OD x 5" Long, Float w/ Std Length Rod
7" OD, Float w/ Std Length Rod
5-1/2" OD, Float w/ Std Length Rod
5-1/2" OD, Float w/ Std Length Rod
5-1/2" OD, Float w/ Std Length Rod
3-1/2" OD x 6" Long, Float w/ Std Length Rod
3-1/2" OD x 6" Long, Float w/ Std Length Rod
S23991 X3F 3 2-
3-1/2" OD x 6" Long, Float w/ Std Length Rod
3
2
1
CODE
--
F
3
(Omitted)
CODE
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
15
1(1)Spareswitchmechanismisrecommendedforevery(10)installedswitchmechanisms.Refertomodelno.forswitch
mechanismquantity,pages4&5.
2Refertopage6,'Electricalrating'table,forswitchmechanismratings.

Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
16633FoltzParkway,Strongsville,OH44149USA
+1.440.572.1500www.clarkreliance.com
www.Jerguson.com● JergusonApp@clark‐reliance.com● +1.440.572.1500
16