Magnetrol C29 User manual

Float
Actuated
Liquid
Level
Switches
Flanged External Cage
Installation and Operating Manual

Read this Manual Before Installing
This manual provid s information on th Flang d
Ext rnal Cag Liquid L v l Switch s. It is important that
all instructions ar r ad car fully and follow d in
s qu nc . D tail d instructions ar includ d in th
Installation s ction of this manual.
Conventions Used in this Manual
C rtain conv ntions ar us d in this manual to conv y
sp cific typ s of information. G n ral t chnical mat rial,
support data, and saf ty information ar pr s nt d in
narrativ form. Th following styl s ar us d for not s,
cautions, and warnings.
NOTES
Not s contain information that augm nts or clarifi s
an op rating st p. Not s do not normally contain
actions. Th y follow th proc dural st ps to which
th y r f r.
Cautions
Cautions al rt th t chnician to sp cial conditions that
could injur p rsonn l, damag quipm nt, or r duc
a compon nt’s m chanical int grity. Cautions ar also
us d to al rt th t chnician to unsaf practic s or th
n d for sp cial prot ctiv quipm nt or sp cific
mat rials. In this manual, a caution indicat s a
pot ntially hazardous situation which, if not avoid d,
may r sult in minor or mod rat injury.
WARNINGS
Warnings id ntify pot ntially dang rous situations or
s rious hazards. In this manual, a warning indicat s an
immin ntly hazardous situation which, if not avoid d,
could r sult in s rious injury or d ath.
WARNING! Explosion hazard. Do not conn ct or
disconn ct quipm nt unl ss pow r has b n switch d off
or th ar a is known to b non-hazardous.
Low Voltage Directive
For us in Installation Cat gory II, Pollution D gr 2.
If quipm nt is us d in a mann r not sp cifi d by
manufactur r, prot ction provid d by quipm nt may
b impair d.
Notice of Co yright and Limitations
Magn trol® & Magn trol® logotyp and ar r gist r d
trad marks of Magn trol
® Int rnational, Incorporat d.
Copyright © 2017 by Magn trol
® Int rnational,
Incorporat d. All rights r s rv d.
P rformanc sp cifications ar ff ctiv with dat of
issu and ar subj ct to chang without notic .
MAGNETROL r s rv s th right to mak chang s to th
products d scrib d in this manual at any tim without
notic . MAGNETROL mak s no warranty with r sp ct
to th accuracy of th information in this manual.
Warranty
All MAGNETROL m chanical l v l and flow controls
ar warrant d fr of d f cts in mat rials or workman-
ship for fiv full y ars from th dat of original factory
shipm nt.
If r turn d within th warranty p riod; and, upon factory
insp ction of th control, th caus of th claim is
d t rmin d to b cov r d und r th warranty; th n,
MAGNETROL will r pair or r plac th control at no
cost to th purchas r (or own r) oth r than transportation.
MAGNETROL shall not b liabl for misapplication,
labor claims, dir ct or cons qu ntial damag or xp ns
arising from th installation or us of quipm nt.
Th r ar no oth r warranti s xpr ss d or impli d, xc pt
sp cial writt n warranti s cov ring som MAGNETROL
products.
Quality Assurance
Th quality assuranc syst m in plac at MAGNETROL
guarant s th high st l v l of quality throughout th
company. MAGNETROL is committ d to providing
full custom r satisfaction both in quality products and
quality s rvic .
Th MAGNETROL quality assuranc
syst m is r gist r d to ISO 9001 affirming
its commitm nt to known int rnational
quality standards providing th strong st
assuranc of product/s rvic quality
availabl .

46-605 Flanged External Cage Float Actuated Liquid Level Switches
Table of Co te ts
1.0 Installation
1.1 Unpacking................................................................ 4
1.2 Critical Alarm Function............................................ 4
1.3 Piping....................................................................... 4
1.4 Mounting..................................................................5
1.5 Wiring...................................................................... 5
2.0 Reference Information
2.1 D scription............................................................... 7
2.2 Th ory of Op ration.................................................7
2.3 Op rating Cycl ........................................................7
2.4 Switch Diff r ntial Adjustm nt.................................7
2.4.1 Low l v l controls...........................................8
2.4.2 High l v l controls......................................... 9
2.5 R plac m nt of Standard Float
and St m Ass mbly................................................. 10
3.0 Troubleshooting
3.1 Ch ck Switch M chanism.......................................11
3.2 Ch ck S nsing Unit................................................ 12
4.0 Preventive Maintenance
4.1 R comm nd d Practic ........................................... 13
4.1.1 K p control cl an........................................13
4.1.2 Insp ct switch m chanisms, t rminals, and
conn ctions monthly....................................13
4.1.3 Insp ct ntir unit p riodically..................... 14
4.2 What To Avoid........................................................14
5.0 S ecifications
5.1 Ag ncy Approvals....................................................15
5.2 Physical...................................................................16
6.0 Re lacement Parts
6.1 Standard Flang d Ext rnal Cag Mod ls................. 18
6.1.1 Parts id ntification....................................... 18
6.1.2 Switch and housing r f r nc ....................... 18
6.1.3 Mod l C29...................................................18
6.1.4 Mod ls D30, J30 and L30........................... 19
6.1.5 Mod ls B60 and C60................................... 19
6.2 Tand m Flang d Ext rnal Cag Mod ls.................. 20
6.2.1 Parts id ntification....................................... 20
6.2.2 Switch and housing r f r nc ....................... 20
6.2.3 Mod l C29...................................................21
6.2.4 Mod ls D30, J30 and L30........................... 21
6.2.5 Mod ls B60 and C60................................... 21
7.0 Model Numbers.............................................................22
Flanged External Cage
Float Actuated
Liquid Level Switches

446-605 Flanged External Cage Float Actuated Liquid Level Switches
Optional
drain valve
Shutoff valve
(if used)
Conduit
outlet
Switch
actuating level
lreference marks
Shutoff valve
(if used)
Typical Piping Arrangement
1.0 I stallatio
Caution If equipment is used in a manner not specified by manu-
facturer, protection provided by equipment may be
impaired.
1.1 U packi g
Unpack th instrum nt car fully. Insp ct all units for
damag . R port any conc al d damag to carri r within
24 hours. Ch ck th cont nts against th packing slip and
purchas ord r. Ch ck and r cord th s rial numb r for
futur r f r nc wh n ord ring parts.
S rial # _____________________________________
Caution Do not discard the shipping container until all parts are
accounted for.
1.2 Critical Alarm Fu ctio
It is r comm nd d that for critical alarm functions, an
additional l v l switch b install d as a high–high or low–
low l v l alarm for maximum prot ction.
1.3 Pipi g
An instruction tag s cur d to th control giv s dim nsional
data on switch actuating l v ls r f r nc d from c nt r lin
of upp r sid tank conn ction. Position control so that
actuating l v ls corr spond with th d sir d liquid l v l
trip points in proc ss v ss l.
Us pip of suffici nt str ngth to support th control. If
n c ssary, provid a stand or hang r to h lp support its
w ight. All piping should b straight and fr of “low
spots” or “pock ts” so that low r liquid lin will drain
towards th v ss l and upp r vapor lin will drain toward
th control. Shut-off valv s ar r comm nd d for installa-
tion b tw n th v ss l and th control. If control is to
b us d with a low t mp ratur liquid (on which will
“boil” in th float chamb r if outsid h at is absorb d),
th chamb r and piping should b insulat d. Such
boiling in th chamb r will caus fals l v l indications.
Caution DO NOT INSULATE SWITCH MECHANISM HOUSING.
For controls quipp d with pn umatic switch ass mbli s,
consult bull tin on m chanism furnish d for air (or gas)
piping instructions.

46-605 Flanged External Cage Float Actuated Liquid Level Switches 5
1.4 Mou ti g
Caution This instrument is intended for use in Installation
Category II, Pollution Degree 2 locations.
Adjust piping as r quir d to bring control to a v rtical
position. Magn trol®controls must b mount d within 3°
of v rtical in all dir ctions. A thr -d gr slant is notic abl
by y , but installation should b ch ck d with a spirit
l v l on top and/or sid s of float chamb r.
Caution Never insulate the switch housing of the level control.
Installation and maint nanc of tand m float mod ls ar
accomplish d in much th sam mann r as d scrib d for
standard mod ls. Additional consid ration must b giv n
to th piping arrang m nt to allow for alignm nt of th
two switch actuating l v l marks on th float chamb r
with th d sir d l v ls in th v ss l.
Caution Operation of all buoyancy type level devices should be
done in such a way as to minimize the action of dynamic
forces on the float or displacer sensing element. Good
practice for reducing the likelihood of damage to the con-
trol is to equalize pressure across the device slowly.
1.5 Wiri g
Caution All Flanged Float Cage units are shipped from the factory
with the enclosing tube tightened and the switch housing
set screw locked to the enclosing tube. Failure to loosen
the set screw prior to repositioning the supply and output
connections may cause the enclosing tube to loosen,
resulting in possible leakage of the process liquid or vapor.
Flang d float cag controls ar shipp d with th conduit
ntry of th switch housing plac d 180° opposit th tank
conn ctions to simplify most installations. If this configu-
ration is appropriat to th installation, proc d to St p 4
to b gin wiring th unit. If anoth r configuration is
d sir d, th switch housing can b asily rotat d by first
following St ps 1, 2, and 3.
NOTE: A switch or circuit breaker shall be installed in close proximity
to equipment and within easy reach of operator. It shall be
marked as the disconnecting device for equipment.
1. Loos n s t scr w(s) at bas of switch housing. R f r to
Figure 1.
2. Switch housing may b rotat d 360° to allow corr ct
positioning of conduit outl t.
3. Tight n s t scr w(s) at bas of switch housing.
4. Unscr w and r mov switch housing cov r. Th thr ads
hav b n lubricat d to facilitat r moval.
NOTE: For supply connections, use wire with a minimum rating of
+167° F (+75° C) as required by process conditions. Use a
minimum of 14 AWG wire for power and ground field wires.
Set
Screw
Screw
Figure 1

646-605 Flanged External Cage Float Actuated Liquid Level Switches
Internal Circuit
(Right) Switch
1
2
3
Load
Load Line
4
5
6
Internal Circuit
(Left) Switch
Load
Load
Close on high level Close on high level
Common Common
Close on low level Close on low level
Line
Figure 2
Terminal Connections
DPDT Switch Mechanism
Series B, C, D, F, R, 8, and 9
NOTE: Housing must be grounded via protective ground screw in the
base of the housing.
NOTE: On high temperature applications (above +250° F [+121° C in
float chamber), high temperature wire should be used
between control and first junction box located in a cooler area.
On non-hazardous applications, flexible conduit may be used
between the control and the first junction box.
5. Th switch t rminals ar locat d n xt to th conduit outl t
to facilitat wiring. Bring supply wir s through conduit
outl t. Rout xtra wir around nclosing tub und r th
baffl plat and conn ct th m to th prop r t rminals.
R f r to Figure 2 or 3 or your switch bull tin for this
information. S S itch and Housing Reference, Section 6.2.2.
6. Dr ss wiring to nsur no int rf r nc or contact with
mov m nt of switch, or r plac m nt of switch housing cov r.
NOTE: It is the responsibility of the customer to comply with applica-
ble installation codes and practices. Class I, Division 1
locations may contain explosive gas mixtures. Appropriate
precautions must be taken. Installation should be performed
by qualified personnel.
7. R plac housing cov r.
8. If control has b n furnish d with an xplosion proof or
moistur proof switch housing, it must b s al d at th
conduit outl t with a suitabl compound or non-hard ning
s alant to pr v nt ntranc of air.
9. T st switch action by varying liquid l v l in float chamb r.
NOTE: If switch mechanism fails to function properly, check vertical
alignment of control housing and consult installation bulletin
for additional wiring information on switch mechanism
furnished. See Switch and Housing Reference, Section 6.2.2.
10. Ch ck cov r to bas fit to b c rtain gask t d joint
is tight. A positiv s al is n c ssary to pr v nt infiltration
of moistur -lad n air or corrosiv gass s into switch
housings.
Caution In hazardous areas, do not power the unit until the conduit
is sealed and the enclosure cover is screwed down
securely.
Figure 3
DPDT Terminals for Series HS only
Internal Circuit
(Right) Switch
1
2
3
Load
Load
Close on low level
Common
Close on high level
Line
4
5
6
Internal Circuit
(Left) Switch
Load
Load
Close on low level
Common
Close on high level
Line

46-605 Flanged External Cage Float Actuated Liquid Level Switches 7
2.0 Refere ce I formatio
2.1 Descriptio
Flang d Ext rnal Cag liquid l v l switch s ar compl t ly
s lf-contain d units d sign d for sid mounting to a v ss l
or tank with thr ad d or flang d pip conn ctions.
2.2 Theory of Operatio
Th d sign of float-op rat d l v l switch s is bas d upon
th principl that a magn tic fi ld will not b aff ct d
by non-magn tic mat rials such as 316 stainl ss st l
Th float mov s a magn tic attraction sl v within a
non-magn tic nclosing tub and actuat s a magn tic
switch m chanism. Th nclosing tub provid s a pr ssur
s al to th chamb r and th r for to th proc ss.
2.3 Operati g Cycle
As th liquid l v l ris s in th chamb r, th float mov s th
magn tic attraction sl v up within th nclosing tub
and into th fi ld of th switch m chanism magn t. As a
r sult, th magn t is drawn in tightly to th nclosing
tub , causing th switch to trip making or br aking an
l ctrical circuit. R f r to Figure 4.
As th liquid l v l falls, th float drops and mov s th
attraction sl v out of th magn tic fi ld, r l asing th
switch m chanism magn t. Th t nsion spring nsur s th
r turn of th switch in a snap action. R f r to Figure 5.
Tand m float units incorporat two floats which op rat
ind p nd ntly. Th y ar arrang d so that th low r float
actuat s th upp r switch m chanism whil th upp r float
actuat s th low r switch m chanism. Th upp r float is
attach d to th low r attraction sl v by m ans of a hol-
low st m. Th low r float attach s to th upp r attraction
sl v with a solid st m which xt nds upward through th
upp r float and st m ass mbly.
2.4 Switch Differe tial Adjustme t
Th standard diff r ntial of Flang d Cag float mod ls
with on switch may b fi ld adjust d. Adjustm nt may b
n c ssary if a wid r diff r ntial n ds to b s t to ov rcom
switch chatt r caus d by th proc ss.
NOTE: This procedure may be applied to single switch models only.
Enclosing tube
(non-magnetic)
Sleeve (magnetic)
Float
Normal
operating level
Magnet
Return
Spring
Pivot
Figure 4
Low level
Swing out
position
Figure 5

846-605 Flanged External Cage Float Actuated Liquid Level Switches
Th diff r ntial, or th amount of l v l trav l b tw n
switch-on and switch-off, may b adjust d by r position-
ing th low r jam nuts on th float st m. This adjustm nt
is diff r nt for high l v l and low l v l controls. R f r to
th appropriat s ction b low for adjustm nt instructions.
NOTE: Maximum differential adjustment is 1 inch.
Caution Differential adjustments should NOT be made in the field
on tandem float models. Switch actuation levels have
been set at the factory to meet customer specifications.
Variations in actual conditions from design conditions,
usually require special control modifications. Consult the
factory or your local representative for assistance.
2.4.1 Low level controls
On low l v l controls th switch trips on th low r actua-
tion point and r s ts on th high r actuation point.
Wid ning th diff r ntial will allow th switch to trip on
th original actuation point and r s t at a lat r or high r
point.
Th diff r ntial on low l v l controls may b adjust d by
r positioning th low r jam nuts on th float st m. Th
standard factory s tting is for a minimum amount of play
(gap) b tw n th top jam nuts and th attraction sl v .
R f r to Figure 7.
1. D t rmin what chang in diff r ntial is n c ssary.
NOTE: To widen the differential by one inch, the lower jam nuts must
be set proportionately lower on the stem (i.e., in this example
by 1 inch).
2. Mak sur pow r sourc is turn d off.
3. Unscr w and r mov switch housing cov r.
4. Disconn ct pow r supply wir s from switch m chanism.
Pull wir s out of conduit conn ction op ning in housing
bas . R f r to Figure 8.
5a. P rform syst m shut-down proc dur s as r quir d to r li v
pr ssur from float chamb r of control. Allow unit to cool.
5b. Clos shut-off valv s (if so quipp d) to isolat control
from tank. Drain off liquid in float chamb r.
5c. On installations without shut-off valv s, r li v pr ssur
from th tank. Drain liquid in tank to a l v l b low th
conn ctions of th float chamb r.
NOTE: Level control, connections and pipe lines need not be
removed from the tank.
6. Loos n nclosing tub nut with a 15⁄16" wr nch. Unscr w
nclosing tub count rclockwis (switch and housing bas
will rotat also), until it is fr . R f r to Figure 8.
Figure 7
Differential adjustment
For access to bottom
jam nuts, remove top
jam nuts, washer, and
attracting sleeve.
Slight play (gap)
must be allowed
(.03" [.8 mm] typical)
Position of bottom
jam nuts (normal
factory setting)
Float
Sleeve stop
strap
Replace in
same position
Drop bottom jam nuts to
increase gap setting
(see instructions below)
0.50"
(13 mm)
Maximum gap setting
(Applies to models having
a single switch mechanism
with a single magnet
actuator only)
Float
Sleeve stop
strap
D
Figure 6
Normal Factory Setting
(minimum differential)

46-605 Flanged External Cage Float Actuated Liquid Level Switches 9
7. Lift nclosing tub , switch, and bas off float chamb r.
Jam nuts and attraction sl v ar now acc ssibl .
8. M asur th distanc “D” from th top dg of th upp r
jam nuts to th top of th float st m. R f r to Figure 7.
R cord this m asur m nt.
9. Loos n and r mov upp r jam nuts, guid wash r and
attraction sl v .
10. Loos n and adjust low r jam nuts to th d sir d position.
Tight n low r jam nuts s cur ly. R f r to Figure 7.
11. R plac attraction sl v on st m.
12. R plac upp r jam nuts and guid wash r on th st m in
th position pr viously not d. Tight n upp r jam nuts
s cur ly. R f r to Figure 7.
NOTE: Use a new enclosing tube gasket when reassembling enclos-
ing tube to the chamber. Make certain that all gasket surfaces
are thoroughly cleaned to allow proper gasket seating. Coat
enclosing tube threads with anti-seizing compound.
13. R plac nclosing tub , switch, and bas on chamb r.
Scr w tub clockwis until tight n d to torqu valu s list d
on pag 10.
14. Loos n th s t scr ws at th bas of th switch housing.
Rotat switch housing to corr ct position and tight n s t
scr ws. R f r to Figure 1 on pag 5.
Caution After increasing gap setting, be certain to check for
proper operation of switch mechanism by raising and
lowering float assembly. Magnet must snap cleanly.
Additional float movement will be available after magnet
snaps.
15. Bring supply wir s through conduit outl t. Follow st ps 5
through 10 in Wiring, Section 1.5.
16. T st switch action by varying liquid l v l in float chamb r.
NOTE: If switch mechanism fails to function properly, check vertical
alignment of control housing and consult installation bulletin
on switch mechanism. If the unit still fails to function
properly, consult the factory.
2.4.2 High level controls
On high l v l controls th switch trips on th high r
actuation point and r s ts on th low r actuation point.
Caution In high level controls, widening the differential requires
raising the trip point a proportional amount. The reset
point will remain the same.
To wid n th diff r ntial by raising th trip point, follow
st ps 1 through 16 in Lo level controls, Section 2.4.1.
Enclosing
tube nut
Conduit
connection
Switch
housing cover
Chamber Float
Enclosing tube
Refer to
Figures 6 and 7
Housing
base
Figure 8

10 46-605 Flanged External Cage Float Actuated Liquid Level Switches
2.5 Replaceme t of Sta dard Float
a d Stem Assembly
1. Disconn ct wiring or m dium lin s from control and p r-
form syst m shutdown. S Troubleshooting, Section 3.0.
2. R mov switch housing ass mbly from float chamb r at
h ad flang .
3. R mov sl v stop strap from th und rsid of th h ad
flang and slid th float st m ass mbly out of th nclos-
ing tub .
NOTE: New float and stem kits are supplied unassembled. Refer to
Figure 9 for standard jam nut settings (Dimension A).
4. Ch ck n w float and st m ass mbly to b c rtain it is th
corr ct r plac m nt unit:
a. Float should b of sam physical siz and shap .
b. St m l ngth should match clos ly.
c. S t attraction sl v p r Dim nsion A as shown in
Figure 9.
NOTE: If differential adjustment has been altered in the field,
disregard Dimension A and readjust new assembly to the
previously determined level differential settings. See Switch
Differential Adjustment, Section 2.4.
5. R plac n w float and st m ass mbly into h ad flang and
install n w stop strap with scr ws includ d.
6. R mount h ad flang on float chamb r using n w gask t
provid d. Tight n flang nuts v nly, using an alt rnating
patt rn typical of standard industry practic .
NOTE: Care must be taken during installation to be certain float stem
does not bend.
7. With control ass mbly in plac , t st switch actuation by
varying liquid l v l in float chamb r.
NOTE: When reassembling the enclosing tube or the upper flange
assembly to the control, tighten according to the following
torque values.
0.03"
Minimum
gap setting
Top jam
nuts
Bottom jam
nuts
Attraction
sleeve
Enclosing tube
(ref.)
Stop tube
Sleeve
stop strap
Retaining
screws
Float and stem
assembly
Head
flange
(ref.)
Dim. A
.87 (22)
Figure 9
Model Flange Bolting Enclosing Tube
C29, D30 55–60 ft–lbs 200–225 ft–lbs
C60, J30, L30 100–125 ft–lbs 75–100 ft–lbs
B60 250–300 ft–lbs 200–225 ft–lbs

46-605 Flanged External Cage Float Actuated Liquid Level Switches 11
3.0 Troubleshooti g
Usually th first indication of improp r op ration is failur
of th controll d quipm nt to function, i. ., pump will
not start (or stop); signal lamps fail to light, tc. Wh n
th s symptoms occur, wh th r at tim of installation or
during routin s rvic th r aft r, ch ck th following
pot ntial xt rnal caus s first.
✔Fus s may b blown.
✔R s t button(s) may n d r s tting.
✔Pow r switch may b op n.
✔Controll d quipm nt may b faulty.
✔Wiring l ading to control may b d f ctiv .
If a thorough insp ction of th s possibl conditions fails
to locat th troubl , proc d n xt to a ch ck of th
switch m chanism.
3.1 Check Switch Mecha ism
1. Pull switch or oth rwis disconn ct pow r to th
control.
2. R mov switch housing cov r.
3. Disconn ct pow r wiring from switch ass mbly.
4. Swing magn t ass mbly in and out by hand to ch ck car -
fully for any sign of binding. Ass mbly should r quir
minimal forc to mov it through its full swing.
5. If binding xists, magn t may b rubbing nclosing tub .
If magn t is rubbing, loos n magn t clamp scr w and shift
magn t position. R tight n magn t clamp scr w.
6. If switch magn t ass mbly swings fr ly and m chanism
still fails to actuat , ch ck installation of control to b
c rtain it is within th sp cifi d 3° of v rtical.
7. Ch ck microswitch continuity with ohm t r. if switch is
damag d, r plac imm diat ly.
8. If switch m chanism is op rating satisfactorily, proc d to
ch ck s nsing unit.
NOTE: As a matter of good practice spare switches should be kept
on hand at all times.
Optional
drain valve
Shutoff valve
(if used)
Conduit
outlet
Switch
actuating level
lreference marks
Shutoff valve
(if used)
Figure 10

12 46-605 Flanged External Cage Float Actuated Liquid Level Switches
3.2 Check Se si g U it
1. R conn ct pow r supply. Car fully actuat th switch
m chanism manually (us a non-conductiv tool on l ctri-
cal switch m chanisms) to d t rmin wh th r controll d
quipm nt will op rat .
Caution With electrical power on, care should be taken to avoid
contact with switch leads and connections at terminal
block.
2. If controll d quipm nt r sponds to manual actuation t st,
troubl may b locat d in th l v l s nsing portion of th
control, float(s), st m(s), and magn tic attraction sl v (s).
3. Ch ck to b c rtain liquid is nt ring float chamb r.
A valv may b clos d or piping may b plugg d.
Caution Be certain to pull disconnect switch or otherwise ensure
that electrical circuit(s) through control is deactivated.
Close operating medium supply valve on controls
equipped with pneumatic switch mechanisms.
4. Disconn ct wiring from supply sid of switch m chanism(s)
and r mov l ctrical conduit or op rating m dium lin
conn ctions to switch housing.
5. P rform syst m shutdown to r li v pr ssur from float
chamb r of control. Allow unit to cool.
6. Clos shutoff valv s (if quipp d) to isolat control from
v ss l. Drain off liquid in chamb r if n c ssary.
7. On installations without shutoff valv s, r li v pr ssur
from v ss l and drain off liquid h ad abov control
mounting l v l.
NOTE: Control chamber, connections, and pipe lines need not be
removed from vessel or boiler.
8. R mov switch housing ass mbly by loos ning h x nut,
which is locat d imm diat ly b low housing bas .
9. With switch housing ass mbly r mov d, insp ct attraction
sl v (s) and insid of nclosing tub for xc ssiv corro-
sion or solids buildup. Such buildup could r strict mov -
m nt, pr v nting sl v (s) from r aching fi ld of switch
magn t(s).
10. If diff r ntial has b n chang d in th fi ld by r position-
ing th low r jam nuts on th float st m, ch ck tightn ss
and position of th jam nuts.
NOTE: Differential adjustment affects a change in the amount of level
travel between switch-on and switch-off actuations. Do not
attempt adjustment without first consulting factory for assis-
tance in computing level differential change for your control.

46-605 Flanged External Cage Float Actuated Liquid Level Switches 13
11. Ch ck float to b c rtain it is buoyant in th liquid (float
chamb r or v ss l must hav ad quat liquid l v l). If float
is d t rmin d to b fill d with liquid, or it is collaps d, it
must b r plac d imm diat ly.
Caution Do not attempt to repair a float. See Replacement of
Standard Float and Stem Assembly, Section 2.5.
If all compon nts in th control ar in op rating condition,
th troubl is lik ly locat d xt rnal to th control. R p at
insp ction of xt rnal conditions as pr viously d scrib d.
NOTE: If difficulties are encountered which cannot be identified,
consult the factory or your local representative for assistance.
A complete description of the trouble should be provided
along with information concerning your piping and mounting
arrangement, plus a description of your operating sequence.
Sketches or photographs showing the installation are also
beneficial.
Wh n inquiring about your control, b c rtain to always
sp cify th compl t Mod l and S rial numb rs.
4.0 Preve tive Mai te a ce
P riodic insp ctions ar n c ssary to k p your l v l
control in good working ord r. This control is a saf ty
d vic to prot ct th valuabl quipm nt it s rv s. A
syst matic program of “pr v ntiv maint nanc ” must b
impl m nt d wh n th control is plac d into s rvic . If
th following s ctions on “what to do” and “what to avoid”
ar obs rv d, your control will provid r liabl prot ction
of your quipm nt for many y ars.
4.1 Recomme ded Practice
4.1.1 Keep control clean
B sur th switch housing cov r is always in plac on th
control. This cov r is d sign d to k p dust and dirt from
int rf ring with switch m chanism op ration. It also pro-
t cts against damaging moistur and acts as a saf ty f atur
by k ping bar wir s and t rminals from b ing xpos d.
Should th housing cov r or any s als b com damag d or
misplac d, obtain a r plac m nt imm diat ly.
4.1.2 Inspect switch mechanisms, terminals, and
connections monthly
1. Dry contact switch s should b insp ct d for xc ssiv
w ar on actuating l v r or misalignm nt of adjustm nt
A
0.03"
Minimum
gap setting
Top jam
nuts
Bottom jam
nuts
Attraction
sleeve
Enclosing tube
(ref.)
Stop tube
Sleeve
stop strap
Retaining
screws
Float and stem
assembly
Head
flange
(ref.)
Figure 11

14 46-605 Flanged External Cage Float Actuated Liquid Level Switches
scr w at point of contact b tw n scr w and l v r.Such
w ar can caus fals switch actuating l v ls. S switch
m chanism bull tin suppli d with control should switch
adjustm nt or r plac m nt b com n c ssary.
2. DO NOT op rat your control with d f ctiv or malad-
just d switch m chanisms. R f r to bull tin on switch
m chanisms furnish d for s rvic instructions. S S itch
and Housing Reference, Section 6.2.2.
3. L v l controls may som tim s b xpos d to xc ssiv h at
or moistur . Und r such conditions, insulation on l ctrical
wiring may b com brittl , v ntually br aking or p aling
away. Th r sulting “bar ” wir s can caus short circuits.
NOTE: Check wiring carefully and replace at the first sign of brittle
insulation.
4. Vibration may caus t rminal scr ws to loos n. Ch ck all
t rminal conn ctions to b c rtain that scr ws ar tight.
5. On units with pn umatic switch s, air (or gas) lin s sub-
j ct d to vibration may v ntually crack or b com loos
at conn ctions causing l akag . Ch ck lin s and conn c-
tions car fully and r pair or r plac if n c ssary.
NOTE: As a matter of good practice, spare switches should be kept
on hand at all times.
4.1.3 Inspect entire unit periodically
Isolat control from v ss l. Rais and low r liquid l v l to
ch ck for switch contact and r s t.
4.2 What To Avoid
1. N v r l av switch housing cov r off th control long r
than n c ssary to mak routin insp ctions.
2. N v r plac a jump r wir across t rminals to “cut-out”th
control. If a “jump r” is n c ssary for t st purpos s, b c r-
tain it is r mov d b for placing control into s rvic .
3. N v r att mpt to mak adjustm nts or r plac switch s
without r ading instructions car fully. C rtain adjustm nts
provid d for in l v l controls should not b att mpt d in
th fi ld. Wh n in doubt, consult th factory or your local
r pr s ntativ .
4. N v r us lubricants on pivots of switch m chanisms.
A suffici nt amount of lubricant has b n appli d at th
factory to nsur a lif tim of s rvic . Furth r oiling is
unn c ssary and will only t nd to attract dust and dirt
which can int rf r with m chanism op ration.

46-605 Flanged External Cage Float Actuated Liquid Level Switches 15
5.0 Specificatio s
5.1 Age cy Approvals
AGENCY APPROVED MODEL AREA CLASSIFICATION
FMAll with an electric switch mechanism and a housing Non-Hazardous TYPE 4X
listed as TYPE 4X
All with an electric switch mechanism and a housing Class I, Div 1, Groups C & D
listed as TYPE 4X/7/9 Class II, Div 1, Groups E, F & G
All with an electric switch mechanism and a housing Class I, Div 1, Groups B, C & D
listed as TYPE 4X/7/9 Class I, Div 1, Group B Class II, Div 1, Groups E, F & G
CSA All with an electric switch mechanism and a Non-Hazardous CSA TYPE 4X
housing listed as CSA TYPE 4X
All with a Series HS, F, 8 or 9 electric switch Class I, Div 2, Groups A, B, C & D
mechanism and a housing listed as CSA TYPE 4X
All with an electric switch mechanism and a housing Class I, Div 1, Groups C & D
listed as TYPE 4X/7/9 Class II, Div 1, Groups E, F & G
All with an electric switch mechanism and a housing Class I, Div 1, Groups B, C & D
listed as TYPE 4X/7/9 Class I, Div 1, Group B Class II, Div 1, Groups E, F & G
ATEX / IEC Ex ➁All with an electric switch mechanism and an ATEX II 2 G EEx d IIC T6
ATEX housing ➀94/9/EC
IEC Ex Ex d IIC T6
IP 66
CE Low Voltage Directive 2006/95/EC Installation Category II
Per Harmonized Standard: Pollution Degree 2
EN 61010-1/1993 & Amendment No. 1
➀Dual stage units with “HS” switches are not ATEX approved.
➁IEC Installation Instructions:
The cable entry and closing devices shall be Ex d certified suitable for the conditions of use and correctly installed.
For ambient temperatures above +55° C or for process temperatures above +150° C, suitable heat resistant cables shall be
used.
Heat extensions (between process connection and housing) shall never be insulated.
Special conditions for safe use
When the equipment is installed in process temperatures higher than +85° C the temperature classification must be reduced
according to the following table as per IEC60079-0.
Maximum Process
Temperature
Temperature
Classification
< 85° C T6
< 100° C T5
< 135° C T4
< 200° C T3
< 300° C T2
< 450° C T1
These units are in conformity with IECEx KEM 05.0020X
Classification Ex d IIC T6
Tambient -40° C to +70° C

16 46-605 Flanged External Cage Float Actuated Liquid Level Switches
5.2 Physical
CHAMBERS WITH 1-INCH CONNECTIONS
INCHES MILLIMETERS
CHAMBERS WITH 2-INCH CONNECTIONS
INCHES MILLIMETERS
CHAMBERS WITH 11⁄2-INCH CONNECTIONS
INCHES MILLIMETERS
Min.
Sp.
Gr.
1" NPT Threaded
& Socket Weld
1" Flanged
Upper Side/Bottom
1" Flanged
Side/Side
Actuating
Levels
1" NPT Threaded
& Socket Weld
1" Flanged
Upper Side/Bottom
1" Flanged
Side/Side
Actuating
Levels
A B C A B C A B C HL LL A B C A B C A B C HL LL
C29 .76 9.94 3.02 13.50 12.81 5.87 16.44 13.46 5.87 17.06 2.95 3.85 252 76 342 325 149 417 341 149 433 74 97
D30 .65 9.19 3.27 12.75 12.06 6.12 15.63 12.71 6.12 16.25 2.50 3.33 233 83 323 306 155 155 322 155 412 63 84
J30 .48 10.19 4.33 14.63 13.06 7.18 17.50 13.71 7.18 18.19 2.61 3.34 258 109 371 331 182 182 348 182 462 66 84
L30 .40 3.24 3.98 82 101
B60 .68 9.81 3.80 14.25 12.68 6.68 17.12 13.33 6.68 17.75 2.77 3.44 249 96 361 322 169 434 338 169 450 70 87
C60 .55 2.87 3.60 72 91
Min.
Sp.
Gr.
11⁄2" NPT Threaded
& Socket Weld
11⁄2" Flanged
Upper Side/Bottom
11⁄2" Flanged
Side/Side
Actuating
Levels
11⁄2" NPT Threaded
& Socket Weld
11⁄2" Flanged
Upper Side/Bottom
11⁄2" Flanged
Side/Side
Actuating
Levels
A B C A B C A B C HL LL A B C A B C A B C HL LL
C29 .76 9.75 3.44 14.38 13.81 6.87 18.38 14.46 6.87 19.06 2.02 2.92 247 87 365 350 174 466 367 174 484 51 74
D30 .65 9.00 3.69 13.12 13.06 7.12 17.19 13.71 7.12 17.88 1.87 2.70 228 93 333 331 180 436 348 180 454 47 68
J30 .48 10.00 4.75 15.06 14.06 8.18 19.12 14.71 8.18 19.75 1.97 2.70 254 120 382 357 207 485 374 207 501 50 68
L30 .40 2.60 3.34 66 84
B60 .68 9.62 4.22 14.69 13.68 7.68 18.75 14.33 7.68 19.38 1.46 2.13 244 107 373 347 195 476 383 195 492 37 54
C60 .55 1.93 2.66 49 67
Min.
Sp.
Gr.
2" NPT Threaded
& Socket Weld
2" Flanged
Upper Side/Bottom
2" Flanged
Side/Side
Actuating
Levels
2" NPT Threaded
& Socket Weld
2" Flanged
Upper Side/Bottom
2" Flanged
Side/Side
Actuating
Levels
A B C A B C A B C HL LL A B C A B C A B C HL LL
C29 .76 10.00 3.56 14.44 13.81 6.87 18.25 14.46 6.87 18.94 2.07 2.97 254 90 366 350 174 463 367 174 481 52 75
D30 .65 8.75 3.81 13.25 13.06 7.12 17.56 13.71 7.12 18.25 1.50 2.33 222 96 336 331 180 446 348 180 463 38 59
J30 .48 9.74 4.87 15.19 14.06 8.18 19.50 14.71 8.18 20.12 1.60 2.33 247 123 385 357 207 495 374 207 511 40 59
L30 .40 2.23 2.97 56 75
B60 .68 9.38 4.34 14.81 13.68 7.68 19.12 14.33 7.68 19.75 1.52 2.19 238 110 376 347 195 485 363 195 501 38 55
C60 .55 1.99 2.72 50 69
Levels ± 0.25" (6 mm)
Levels ± 0.25" (6 mm)
Levels ± 0.25" (6 mm)

46-605 Flanged External Cage Float Actuated Liquid Level Switches 17
C
HL
LL
D
D
plugged
A
B
10.12
(257)
8.46
(215)
C
HL
LL
D
D
plugged
A
B
5.93
(151)
10.12
(257)
3.78
(96)
8.46
(215)
Side/Bottom FlangedThreaded and Socket Weld
C
HL
LL
D
D
plugged
A
B
5.93
(151)
10.12
(257)
3.78
(96)
8.46
(215)
Side/Side Flanged
Conduit Connections D
Electrical Switches
TYPE 4X/7/9: 1" NPT
Group B: 1" NPT
Pneumatic Switches
TYPE 1: 1⁄4" NPT
NOTES
1. Switch actuating levels (HL & LL) are given for
minimum specific gravity conditions. Levels will be
lower in the float chamber for higher specific gravities.
2. Standard process connections are a combination of
1" NPT and 1" socket weld coupling.
3. Allow overhead clearance of 10" (254 mm) for
NEMA 4X/7/9 housing.
Inches (mm)

18 46-605 Flanged External Cage Float Actuated Liquid Level Switches
6.1.1 Parts identification
6
1
3
2
9
15
14
4
8
57
12
10
11
17
16
13
6.1.3 Model C29
Housing cover Refer to Section 6.1.2
Housing base Refer to Section 6.1.2
Switch mechanism Refer to Section 6.1.2
Enclosing tube kit: includes items 4 and 5 ➀089-5933-004
Enclosing tube gasket 012-1204-001
Head flange kit: includes items 5, 6, 7, 8, and 9 089-4203-001
Flange gasket 012-1301-025
Float chamber kit: includes items 7, 8, 9, and 10 089-4603-001
Float and stem assembly: includes items 9, 11, 12, 13, 14, 15, 16, and 17 ➀089-3257-001
Complete control less float chamber (10), bolts (7), and nuts (8) √089-6567-003
Series Type Bulletin #
Dry contact B, C, D 42-683
Hermetically sealed F 42-683
Hermetically sealed HS 42-694
Bleed type pneumatic J 42-685
Non-bleed type pneumatic K 42-686
High temperature 8, 9, R 42-799
6.1.2 Switch and housing reference
IMPORTANT
When ordering, please specify:
A. Model and serial number of control.
B. Replacement assembly (kit) part number.
6.0 Replaceme t Parts
6.1 Sta dard Fla ged Exter al Cage Models
1 Housing cover
2 Housing base
3 Switch mechanism
4 Enclosing tube
5 Enclosing tube gasket
6 Head flange
7 Studs
8 Hex nuts
9 Flange gasket
10 Float chamber
11 Stop strap
12 Screws
13 Float and stem assembly
14 Jam nuts
15 Guide washer
16 Attraction sleeve
17 Stop tube (not required for Models C29 and D30)

46-605 Flanged External Cage Float Actuated Liquid Level Switches 19
6.1.4 Models D30, J30 and L30
Housing cover Refer to Section 6.1.2
Housing base Refer to Section 6.1.2
Switch mechanism Refer to Section 6.1.2
Enclosing tube kit ➀ ➁ 089-5915-001 089-5933-011
includes items 4 and 5
Enclosing tube gasket 012-1204-001 012-1301-002
Head flange kit 089-4204-001 089-4205-001
includes items 5, 6, 7, 8, and 9
Flange gasket 012-1301-023 012-1301-026
Float chamber kit ➂089-4604-001 089-4605-001
includes items 7, 8, 9, and 10
Float and stem assembly ➀089-3204-001 089-3205-001 089-3206-001
includes items 9, 11, 12, 13, 14, 15, 16, and 17
Complete control ➀ √ 089-6569-002 not available
less float chamber (10), bolts (7), and nuts (8)
D30 J30 L30
6.1.5 Models B60 and C60
Housing cover Refer to Section 6.1.2
Housing base Refer to Section 6.1.2
Switch mechanism Refer to Section 6.1.2
Enclosing tube kit: includes items 4 and 5 ➀089-5933-004 089-5933-011
Enclosing tube gasket 012-1204-001 012-1301-002
Head flange kit: includes items 5, 6, 7, 8, and 9 089-4206-001 089-4206-002
Flange gasket 012-1204-015 012-1301-024
Float chamber kit: ➂ includes items 7, 8, 9, and 10 089-4606-001 089-4606-002
Float and stem assembly: includes items 9, 11, 12, 13, 14, 15, 16, and 17 ➀089-3208-001 089-3209-001
Complete control less float chamber (10), bolts (7), and nuts (8) ➀ √ 089-6568-004 089-6568-003
B60 C60
NOTE: All replacement assemblies listed are furnished in kit form for standard base models. Consult local representative for ordering assistance
on all special model replacement parts or accessories not included in above listing.
➀ For models with -2 material codes, consult factory for spare parts.
➁ Model D30 unit is specially designed for Dowtherm “A” service only, with Hastelloy C enclosing tube.
➂ Kits are units with 1” NPT or SW side/bottom connections. For other configurations, consult factory.
√ Furnished with one Series C, SPDT Snap Switch and NEMA 4X/7/9 cast aluminum switch housing.

20 46-605 Flanged External Cage Float Actuated Liquid Level Switches
6.2.1 Parts identification
Series Type Bulletin #
Dry contact B, C, D 42-683
Hermetically sealed F 42-683
Hermetically sealed HS 42-694
Bleed type pneumatic J 42-685
Non-bleed type pneumatic K 42-686
High temperature 8, 9, R 42-799
6.2.2 Switch and housing reference
IMPORTANT
When ordering, please specify:
A. Model and serial number of control.
B. Replacement assembly (kit) part number.
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19
18
2 0
11
10
9
4
2
14
3
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12
5
8
7
6
13
1
15
17
16
6.2 Ta dem Fla ged Exter al Cage Models
1Housing cover
2Housing base
3Switch mechanism
4 Enclosing tube
5 Enclosing tube gasket
6 Head flange
7 Studs and bolts
8 Hex nuts
9 Flange gasket
10 Stop strap
11 Screws
12 Upper float and stem assembly
13 Lower attraction sleeve
14 Spacer washer
15 Retaining ring
16 Jam nuts
17 Upper attraction sleeve
18 Lower float and stem assembly
19 Safety stop washer
20 Float chamber
21 Chamber liner (not shown)