Top Mounted Guided Float Level Switches
 
Principle of Operation :
Top mounted level switches work on permanent magnet reed switch basis. The floats which contain permanent magnets move freely between their stops rising or falling with liquid level movement. Hermetically sealed within the tube are reed switches, completely isolated from the medium. The magnet's field actuates the reed switch as the float moves while the stoppers restrict overrun and prevent the reed switch returning to its original position. Stopper positions should not be changed.
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Salient Features :
Reed - Switch actuated level switches work on the principle of magnetic flux linkage and therefore they are glandless and leak-proof instruments.
No Power Consumption.
Contacts are potential free, NO, NC or changeover contacts can be provided.
Practically no maintenance is required except periodic cleaning.
As reed-switches are inside metallic tube-guide pipe,they are protected from mechanical damage.
As the reed switches are "hermetically sealed-in-glass," under an inert gas atmosphere contacts are protected from contamination.
Reed switches, due to their low contact resistance are generally recommended for low voltage application.Reed switches have Rhodium contacts.
Wherever Low Voltage are available 24V or less Reed-Switch actuated level switches may be used directly, Otherwise it should be used in conjunction with our "Electronic control Unit." This ensures enhanced life of the level switch.
Wide operating temperature range from -400C + 1750C.
Reed-Actuated level switches are ideal where vibration is involved.
In a single level switch we offer a maximum of 5 level sensing.
For highly viscous liquids heavy floats with teflon coated guide pipes are available & also our VMT-EXT models can be used.
 
Model VMT- 16m :
Model VMT-16m
Process Connection 1/8"BSP(M)
Mounting Hole 10 mm
Gasket PTFE Teflon Flat Ring
Material of Construction SS 316
Type of Switch SPST
Switch Rating 60VA / 100VA
Total Stem Length 40mm below hex
Float 28mm dia X 28mm long
Maximum Switching Voltage 300 VAC / DC
Maximum Working Temperature 125o C
Maximum Working Pressure 4 kg/cm2
Wire length 1 metre long 19/36 SWG PTFE insulated
  NOTE : By reversing the float the contacts can be changed from NO to NC or vice versa.
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Model VMT- 16m - L :
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Model VMT-16m-L
Process Connection 1/4"BSP(M)
Mounting Hole 13 mm
Gasket PTFE Teflon Flat Ring
Material of Construction SS 316
Type of Switch SPST
Switch Rating 60VA / 100VA
Total Stem Length 32mm H & 75mm V
Float 28mm dia X 28mm long
Maximum Switching Voltage 300 VAC / DC
Maximum Working Temperature 125o C
Maximum Working Pressure 4 kg/cm2
Wire length 1 metre long 19/36 SWG PTFE insulated
 
 
Model VMT- 16 :
Model VMT-16
Process Connection 1/4"BSP(M)
Mounting Hole 13 mm
Gasket PTFE Teflon Flat Ring
Material of Construction SS 316
Type of Switch SPDT
Switch Rating 60VA
Total Stem Length 32 mm H & 75 mm V
Float 41 mm dia X 54 mm long
Maximum Switching Voltage 300 VAC / DC
Maximum Working Temperature 125o C
Maximum Working Pressure 4 kg/cm2
Wire length 1 metre long 19/36 SWG PTFE insulated
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Model VMT- 04 - F40 - GN - PG7 :
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Model VMT-04-F40-GN-PG7
Process Connection 50mm round flange with 4 nos. bolt holes of 5mm dia on 4omm PCD.
Material of Construction Flange in Glass filled nylon,Float in PU
Type of Switch SPST-Single Level Only
Switch Rating 60 VA
Total Stem Length As per your requirement
Float 25mm dia x 25mm long
Maximum Switching Voltage 230 VAC
Maximum Working Temperature 70o C
Maximum Working Pressure 2 kg/cm2
Cable Entry PG7
Wire length 1 metre standard (3 Core PVC Insulated)
 
 
Model VMT-16-1" BSP(M) - PG9 :
Model VMT-16-1" BSP(M) - PG9
Process Connection Threaded to 1" BSP(M).
Can be given in 1.1/2" & 2" BSP Threading
Material of Construction Hex, Pipe & Stopper in SS 316 & Float in SS 316L
Type of Switch SPST
No. of Switches Maximum 2 Nos. (2 Levels Only)
Switch Rating 100 VA
Total Stem Length As per your requirement (Max. upto 1 meter)
Float 28mm dia x 28mm or 28mm dia x 47mm
41mm dia x 54mm
Maximum Switching Voltage 300 VAC / DC
Maximum Working Temperature 125o C
Maximum Working Pressure 4 kg/cm2
Enclosure DIN 43650 Plug & Socket type Connector
  NOTE : We can give Maximum upto 4 levels with 4 floats with PG9 Cable Gland.
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Model VMT- 16 - SSCG :
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Model VMT-16-SSCG
Process Connection 1/4"BSP(M)
Material of Construction SS 316
Type of Switch SPST / SPDT
Switch Rating 100VA / 60VA
Total Stem Length 150mm & 250mm
Float 53mm dia (at collar) Spherical Float SS316L
Maximum Switching Voltage 300 VAC / DC
Maximum Working Temperature 125o C (Higher Temprature of 175o C optional )
Maximum Working Pressure 10 kg/cm2
Cable Entry 3 Core PTFE with overall silicon insulation
Cable Gland SS 316
 
 
Model VMT-16-3"TC - AH :
Model VMT-16-3"TC-AH
Process Connection 3"TC (Any Other TC size can be given)
Material of Construction SS 316
Type of Switch 2 Nos. SPST Reed-Switches. (Max.4 Levels)
Contact Configuration Low Level - makes / breaks on fall of level.
high Level - makes / breaks on rise of level.
Switch Rating 100 VA
Total Stem Length As per your requirement
Float 50mm dia x 85mm long SS316L or As per TC size
Maximum Switching Voltage 300 VAC / DC
Maximum Working Temperature 125o C (Higher Temprature of 175o C optional )
Maximum Working Pressure 10 kg/cm2
Enclosure Cast Aluminium Weather proof - IP66
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Model VMT- 04 - F82 :
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Model VMT-04-F82
Process Connection 82mm Square flange with 4 nos bolt holes of 10mm dia on 82mm PCD
Material of Construction Float in SS316 L , Flange & Pipe in SS304.
Type of Switch SPST
Switch Rating 100 VA
Total Stem Length 200mm (Max upto 3mtrs.)
No. Of Levels 1, 2, 3, 4 Upto maximum of 5.
Contact Configuration Low Level - makes / breaks on fall of level.
high Level - makes / breaks on rise of level.
Float 50mm dia x 85mm Long SS316L
Maximum Switching Voltage 230 VAC
Maximum Working Temperature 125o C (Higher Temprature of 175o C optional )
Maximum Working Pressure 10 kg/cm2
Enclosure SS304
Cable Entry Neoprene Gromet
 
 
 
Model (VMT-16-EXT) :
'MAHALAXMI' make Model (VMT-16-EXT) is a top mounted level switch with externally adjustable Contacts. This model can be used for high temperatures upto 350ºC, pressure 14kg/cm² & also in liquids which carry suspended matter or iron particles or even sticky liquids. The switches are adjustable externally & can be easily replaced without shut down. The switches have a changeover contact & DIN 43650 plug & socket type connectors. Guide pipe for the float has to be provided.
 
NOTE : The size of the flange & float are tailor made to suit specific applications.We can supply this particular model with external cage also. The material of external cage can be in Mild Steel or Stainless Steel as per the customers requirement.
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Model (VMT-16-BM) :
'MAHALAXMI' make Model (VMT-16-BM) is a top mounted level switch with bracket suitable for mounting on the tank wall. This model can be used for open tanks where there is no pressure. The compression type gland fitting on the bracket gives the customer the advantage of adjusting the level as desired on site. Enclosures and size of the float will differ as per applications.
 
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SS 316, L-Bracket Suitable for Mounting in open tanks on side walls
   
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Straight Bracket
 
 
TERMINAL ENCLOSURE DETAILS
 
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  • Cast Aluminium Flame Proof enclosure as per IS 2148-2004 and IP 66-WP.
  • Suitable for group I, II A & II B Gases.
  • Group II C available on request.
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     Cast Aluminium Weather Proof enclosure IP 66-WP.
   
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      SS 304 Weather Proof Enclosure
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Fig. 1                      Fig. 2

Fig. 1 : E-Earthing, 1-High Level, 2- Low Level, 3-Common :- This connection is for 2 point level switch where 2 nos. SPST Reed
Switches are used.

Fig. 2 : E-Earthing, 1-NC, 2-NO, 3-Common :- This connection is for Single point level switch where 1 no. SPDT Reed Switch is used.

NB : In Fig.2 in case of single level with SPST Reed Switch connections shall be in terminal nos. 1 & 2.
 
 
Top Mounted Level Switches Model Details
 
Details of Standard Flanged Connections
F60, F65, F82, F92 Standard Connection
(All Dimensions in MM)
Flange
Denote 		Outside Dia / Dimension Bolt-Hole Circle Dia(PCD) No. of
Bolt-Hole 		Bolt-Hole
Dia 		Thickness
F60 78 Dia 60 4 6 8
F65 78 Dia 65 4 6 8
F82 82 mm
(SQUARE)		 82 4 10 10
F92S 92 mm
(SQUARE)		 92 4 14 12
F92 120 Dia 92 4 14 12
F120 150 Dia 120 4 14 12
Any other connections as per ASA / DIN / JIS / BS Tables on request to suit specific requirments
 
Ordering Specifications for Top Mounted Level Switches
Material of Construction SS304 / SS316 / SS316L / PVC / PP or others.
Process Connection Flanged - Our Standard / or as per ASA,DIN,BS or JIS / Threaded (BSP or NPT)
Enclosure Cast Aluminium Weather Proof / SS Weather proof / Flame proof / DIN 43650 Plug & Socket type
Total Stem Length Maximum upto 3 metres
No.of Levels 1,2,3,4 upto maximum of 5
No.of Floats 1,2,3,4 or 5
Contact Configuration Low Level-makes/breaks on fall of level / High Level-makes/breaks on rise of level
Switching Distance from flange  
Height of Tank  
Operating Process Temperature  
Operating Process Pressure  
Operating Voltage  
Specific gravity and name of liquid.  
Application  
 
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