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Top Mounted (Float Operated)
level Switch Series 40H-3
Description
The 40H-3 level switch is designed for internal mounting through the
top of the precess vessel. The main advantage of these level switches
is lower cost. Mounting connections are offered in 1" NPT optional and
in a variety of flange sizes and pressure ratings.
Principle of Operation
a) For Single Switch Mechanism (Series 311) (Refer Fig.1)
The operating principle provides for magnetic switch action resulting
form a change in liquid level, which moves a rnagnetic. Attraction
Sleeve into the field of an externally located magnet. The illustrations
given indicate the operating principle using a FloatJDisplacerto provide
the operating motion. A Falling level causes a downward rnovement of
a magnetic Attraction Sleeve moving it below the magnetic field
generated by the externally mounted alnico magnet. The bias spring
then causes the magnet to pull away from Enclosing tube in turn
actvating the Switch. The reverse function takes place on rising level
with the Attraction Sleeve being moved into the field causing the magnet
to pull in towards the Enclosing tube, in turn actuating the Switch.
b) For Double Switch Mechanism (Series 321) Refer Fig.2)
ATTRACTION
SLEEVE
The Stainless Steel magnetic Attraction Sleeve (3) actuated by the
floatJdisplacer, is outside the field (2) of the Alinco perrnanent magnet
(1), the switch is in the "Released" position & an electical circuit is open
for (L-C) connection of Micro Switch (4). The switch is held in the
"Released" position by gravity and the tension of spring which provides
the snap action when the spring operates. Refer figure 2A.
When the floatJdisplacer causes the Attraction Sleeve to enter the field
of permanent magnet associated with a given switch,the magnet swings
into contact with the non rnagnetic Enclosing Tube (5) & the switch is
then "Actuated" (Refer figure 2B). In the actuated position of the switch
there is a closed electrical circuit, between L-C of Micro Switch.
Figure 1
FALLING LEVEL
Note:1
ALNICO PERMANENT
Switch mechanisrn is interchangable and may be fitted with any Level
Switch provided the Swtiching Gap does not exceed the rnaximum of
115 mm.
Each switch unit has a nominal differential of 25 :t 5mm. If a differencial
greater than 25 :t 5mm is required for the pump control, two switch unit
must be used with a holding circuit arranged for the starter control
circuit. With the switches set at the minimum operation the combined
differential will be 33 :t 5mm. Wider differential may be obtained by
increasing the seperation between the switches. Contact L-C is normally
open contact and H-C is normally closed contact and these are marked
on micro switch. The L-C circuit closes on a rise of water level, the HC circuit closes on a fall of water level. Each switch unit has a normal
MAGNET (1)
(4) MICRO
MAGNETIC FILED (2)
(5)
ATTRACTION
SLEEVE
40 H................
Series 40HWP ........
(3)
HIGH
differential of 25 :t 5mm of liquid at SG 1.00
Series Description
(Commonfor all 40H SeriesModels)
SWITCH
(UPPER)
LEVEL
Figure 2A
NORMAL LEVEL
Figure 2B
Specifications (for 40H-3 Model)
Service .................
Specific Gravity....
Pressure ..............
Temperature .........
Differential
Series40HWP.40EI
Attraction Sleeve...
Enclosing Tube
Condensation oil & Viscous liquids
Refer Table 2 on Page 3
Refer Table 2 on Page 3
150C without cooling fins
350C with cooling fins.
a) 25 :!: 5mm for 1 switch assembly
model (Series 311)
b) 115 mm maximum with individual
differential of switch as 25:i:5 mm for
2 switch assembly model. (Series 321)
410 Series Stainless Steel.
304 Stainless Steel
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Float Rod & Rod
Guide Pipe
316 Stainless Steel
Electrical Connection
Housing Matetial
311
321
Aluminium Alloy Base & Cover
1"
3"
3"
3"
3"
4"
4"
4"
Model NumberDescription
Level Switch with 1 Switch Assembliesand 1 Float
Level Switch with 2 Switch Assembiesand 1 Float
Material of Construction
Specify
2
:3
4
5
6
7
For Corrosive application Float along with Float Rod and
Rod Guide Pipe can be given in Teflon coated only, as solid teflon
float would increase the weight of the float Assembly and cause
a problem in floating. Teflon is recommended for Atmospheric
pressure only.
Float
Maximum
Pressure 900x135
Maximum
Pressure
800 mm
50 kg.
1000mm
50 kg.
0.9
500 mm
50 kg.
500mm
50 kg.
200mm
50 kg.
0.8
NPT
NPT
150 ASA
300 ASA
600 ASA
150 ASA
300 ASA
600 ASA
Float, Float Rod & Rod Guide Pipe
316SS
Teflon
DTA
DSA
ESA
ETA
GSA
GTA
GSB
GTB
GSC
GTC
HSA
HTA
HTB
HSB
HSC
HTC
NSE
NTE
Note:
Maximum
Pressure
1.0
twd & 9a4 ftuIde
Tank Connection and Float
Any Other
(Please Specify)
Liquid
Specifil
Gravity
... tk
Tank Connection
3/4" NPT(Single cable entry standard,
others optional)
Description
C.S Plate Flange, IS 226
C.S Forged Flange, ASTM-A-105
Carbon Steel (for Threaded Connector)
304 SS Flange / Threaded Connector
316 SS Flange / Threaded Connector
Non Standard Flange Material
~~
1500mm
25 kg.
2000mm
15 kg.
1000mm
25 kg.
1650mm
15 kg.
500mm
25 kg.
1570mm
15 kg.
250mm
25 kg.
1500mm
15 kg.
500mm
15 kg.
500mm
0.7
Maximum
Pressure
30 kg.
0.6
The insertion depth is applicable at Ambient temperature.
Model Number Description(
40HWP/311/GSA/SSW
Defines a level switch in weather proof enclusure with 1 float
+ 1 switch assembly. The flange is of carbon steel of 3" 150
ASA and float of 316 SS. Switch is SPDT of 5A 230 V AC
rating.
Series 40H-3)
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Top Mounted (Dlsplacer Operated) level Switch Series 40H-4
The 40 H-4 Level Switch is designed for internal Mounting throught the top of the Process Vessel and is also
furnished with Chambers for External Mounting from the Process Vessel. The use of displacers as the sensing
medium allows for wide switching differential, field adjustable switching points and use on high pressure applications.
Mounting connections without chambers are offered in 3" NPT screwed & 4" 150 ASA Flanged as standard.
For Level Switches with Chamber, process connection are offered in Threaded, Socket weld & flanged of sizes
1", 1%" and 2".
These Level Switches are offered with either Narrow or Wide Differential. Displacers are available in 316 Stainless
Steel, Teflon or Polyproplene with a 2 Meter suspension cable as standard. Special cable lengths upto 20 meters
are available for internal Mounted switches only.
Principleof Operation
Displacer operated Level Switch offer control features not found in float operated controls. The basic sensing
means utilizes displacer heavier than the liquid which is suspended from a spring. When the liquid contacts the
displacer, a buoyancy froce is produced, which causes the effective weight of the displacer to change, in turn
causing the spring to seek a new balance position which moves the attraction sleeve into the field of the magnet.
This principle provides for wide switching differential and allows the desired level switching point to be adjusted
by moving the displacers up or down the suspension cable. Further advantage allows for adoption to high pressure
applications since displacers have substantial heavier wall thickness than floats and in many cases are made
out of solid materials.
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Technical Specifications
Model Number Description
(Series 40H-4)
S.G
Narrow differential (fixed) type using One Switch Differential
Assembly and One Displacer. (Min. Operating
point of 450 mm. Refer Fig. 3)
0.6 (Minimum)
50:t 7mm at S.G. 1 for models 411,
422, 4114 & 4224. Differential for
Model 412 & 4124 depends upon
distance between the displacers.
Wide Differential (Adjustable) type using One
Switch Assembly and Two Displacers. (With
A) Without External Chamber:
Minimum upper & lower operating points of 475
Pressure
30 kg/cm2 (Maximum)
mm & 675mm respectively. Refer Fig. 4)
a) S.S. & Teflon Displacers 150C
422:
Narrow Differential (Fixed) type using Two Switch Temperature
b) Polyproplene Displacers 70C
Assemblies and Two Displacers. Each switch is
B) With External Chamber:
actuated at different level and calibrated with
Narrow Differential Band (with minimum upper Pressure
100 kg/cm2 (Maximum)
and lower operating point of 475 mm & 725 mm Temperature
150C
respectively. Refer Fig.5)
Model Number Description (Without External
4114 : Narrow Differential (Fixed) type using One switch Chamber) Series 40H-4
assembly and One Displacer.(Min. operating
point of 200 mm. Refer Fig. 6)
4124:
Wide Differential (Adjustable) type using One
Switch Assembly and Two Displacers.(With
minimum upper & lower operating points of 40HWP/ 411 /3/ HSA/ SDE
225mm & 425mm respectively. Refer Fig. 6)
Defines a level switch in Explosion Proof Housing
4224 : Narrow Differential (Fixed) type using Two Switch with 1 Switch Assembly & 1 Displacer. Flange is of
Assemblies and Two Displacers. Each switch is 4", 150 ASA forged A-105, Switch is DPDT of 5A
actuated at different level and cali berated with 230V AC rating.
Narrow Differential Band (With minimum upper
& lower operating point of 225 mm and 475 mm
respectively. R!3fer Fig. 6)
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Figure 3: Model 411
Figure 4: Model 412
Figure 5: Model 422
Figure 6: Model 4114, 4124
& 4224 (Spacer provided to
reduce operating points)
Chambers are supplied with models 411 & 4114 (1 Displacer & 1 Switch Assembly) as Standard. Contact
Factory for other models with Chambers.
Model Number Example: (With External Chamber) 40HWP / 411 I 6 I SSW I E6-11
Series 40H-4
Defines a level switch weather proof having 1 switch
assembly. The process flange is of 316 SS of 1" 150
ASA & external cage is also of 316 SS. Switch is SPOT
having 5A 230V AC rating. The process flanges are
side and bottom
Note:
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Mounted level Switch (Float Operated)
Series 40H-S
Description
The 40H-5 level switches are designed for mounting externally
on the process vessel and when used with isolation valves allows
the switch to be isolated from the process, This feature is useful
during startup, or when maintenance is required.
The chambers are offered with NPT, Socket weld and flanged
connections as standard. The External cage can be welded type
which makes is less prone to leakage, lighter in weight and
consequently less expensive. Optionally Bolted type External
cage is available which is comparatively heavier, but has an
edge over former for ease in cleaning, inspection and has
replacement feature of float Assemblies.
Principleof Operation
The operating principle provides for magnetic Switch action
resulting from a change in liquid level, which moves a magnetic
attraction sleeve into the field of an externally loacated magnet.
This principle eliminates problems associated with flexing
diaphragm seals, bellows seals, as well as coating problems
encountered by probe type devices.
Speclflcatlons~
Pressure & Temperature
Attraction Sleeve
Enclosing Tube
Electrical Connection
Drain
Repeatability
Rating
Refer
below
410 Series Stainless Steel
304 SS
3/4" NPT (Others optional)
3/4" NPT (Standard)
:!:1.5 mm at S.G. 1
Cage Description (For 40H-S Model)
Pressure
Diffetenti~l
..t..$,,~,/1(:I#$!mm)(Maximum)
54S
54F
0.6
60S
60F
0.5
74S
74F
0.7
70 kg/cm2
80S
80F
0.6
100 kg/cm2
100 kg/cm2
160 ka/cm2
25mm
Temperature
(Maximum)
Cooling Fins
1500C
Not Required
3500C
400C
Provided
Switch & Enclosure Details (Common for 40H-3, 40H-4, & 40H-S Models)
Switch
Description
Switch Enclosures
Rating
Ex. Proof int. Safe
W. Proof
AC
(40 HWP) I
Type'TVS'
Standard Micro Switch
(Silver Plated)
5A, 230V AC
TYpe'OE'
Standard Micro Switch
(Gold Plated)
5A, 230V AC
Type 'SZ' Micro Switch
(Silver Plated) for Process
temp of 3000C & above
5A, 230V AC
Type '1 HM1'
Micro Switch Hermaticalty
Sealed, (Silver plated)
1A, 115V AC
400 Cyles
Type '3 HM1'
Micro Switch Hermatically
Sealed (Gold Plated)
1A, 115\1 AC
400 Cyles
Type'R' Hermatically
Sealed Heed Switch
(Radium plated)
SwitchingAmpli- 0:25A 230 V DC
fier Rating
5A, 230V AC
0.5A, 110V DC or
0.25A, 230V DC
(40 HWP
40EI)
SSW
OPOT
SOW
SOE
SOl
SPOT
OSW
OSE
OSt
OOW
ODE
OOt
TSW
TSE
TSI
TOW
TOE
TOI
1HSW
1HSE
1HSI
OPOT
1HOW
1HOE
1HOt
SPOT
3HSW
3 HSE
3HSI
OPOT
3HOW
3 HOE
3HOI
SPOT
RSW
OPOT
ROW
4~, 28V DC
SPOT
0.5A, 110V DC or
0.25A, 230V DC
4A, 28V DC
(40H)
SSE
SSI
RSI
ROE
ROI
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Material
304SS 316SS
1" NPT
A3
A4
A6
1W' NPT
B3
B4
B6
1"S.W.
C3
1%" S.w.
03
04
D6
1" 150 ASA
E3
E4
E6
1" 300 ASA
G3
G4
G6
1" 600 ASA
H3
H4
H6
1" 900 ASA
J3
J4
J6
Stvle
183
II
ASA
K3
1%" 300 ASA
M3
M4
M6
12" 600 ASA
P3
P4
P6
12"900ASA
R3
R4
R6
NON STANDARD
S3
S4
S6
& 9M fteoIde
40HWP / 74F / TSW / A3-1
Defines a level switch in weather proof enclo sur
e
having Flanged Cage. Temperature upto 350C and
Pressure less than 70 kg/cm2.Switch is of BZ type in SPOT.
Cage is of Carbon Steel with 1" NPT Process Connection
on Side and Bottom.
TVPEOFPROCESS
CONNECTIONS
Connection
twd
,-,o-sw
III
---ft-------------_.
IV
STYLE V
V
VI
---ill.
STYLE VI
Model Number Description (Series 40H-S)
p!;<:!;<:!;<:!
-------------------------------------float & Chord level Indicator
ORDERING INFORMATION
Series 40 C
40 C
Archimeds Principle sates th'at a body immersed in a fluid is
bvoyced up by a force equal to the weight of the fluid displaced.
If an object immersed in a fluid is lighter than the fluid displaced,
it will rise and float. Figure shows a guided float in its normal
position with its centre of gravity on the same vertical line and
above the centre of buoyancy. When the level increases, the
float is pushed upwards and the pointer which is moved freely
on scale, will come down with its self weight and show the
readings. When level comes down float will pull the pointer
upwards. Two pulleys are provided to change tile direction with
less friction. Guide ropes are provided to avoid free movement
of float. Tension springs are provided to absorb sudden vibration.
1) C/C Distance
2) Process Connection
3) MOC
4) Service
5) Pressure
6) Temperature
::11::
:::E:uu_---=-=-=:-_-:='
Application
Open tank, Closed tank, Storage tank, Underground sumps.
v. AUTOMAT & INSTRUMENTS (P) LTD.
Automat House,F-61,OkhlaIndustrialArea,Phase-I,NewDelhi-110020(INDIA)
Ph. : 6816349,6817268,6817820,6810307,6810280Fax: 91-11-6819440
E-mail: vautomat@vsnl.comwebsite: www.v-automat.com
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Ph.: 332947
Mumbai-400
074
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Ph.: 556712,5570677,
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Manickam
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Complex,
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Chennai-600
029
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BehindKPHB
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