SINCE 1992

311 Sagar Industrial Estate, Near Toll Naka, Dahisar (East), Mumbai - 400 068, Maharashtra, India.Tel.: +91 - 22 - 22 - 2848 1285 / 2896 4612 | Fax: +91 - 22 - 2848 1285 | E-mail: maha.laxmi@vsnl.com | Website: www.mahalaxmiinstruments.com

MAGNETIC�LEVEL�SWITCHESREED�SWITCH�ACTUATED

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Magnetic Level switches are widely used for measurement and control of almost any liquid level. User area include lubrication systems, hydraulic power packs, industrial washing & cleaning systems. Ultrasonic cleaning equipments, machine tools, storage tanks, liquid dispensing systems, over head and underground storage tanks, thermic fluid heaters, boilers etc.

Potential free contacts provided in the level switch may be utilised to make or break an electrical circuit indication of high and low levels, audible high/low level alarms, automatic pump control, to open or close electrically operated valves, to cut-off or switch on heating elements.

The Basic reed switch consists of two identical flattened ferromagnetic reeds, sealed in a dry inert-gas atmosphere within a glass capsule as shown above. The reeds are sealed in the capsule in cantilever form so that their free ends overlap and are separated by a small air gap. When a magnetic force is generated parallel to the reed switch, the reeds become flux carriers in the magnetic circuit. The overlapping ends of the reeds become opposite magnetic poles, which attract each other. If the magnetic force between the poles is strong enough to overcome the restoring force of the reeds, the reeds will be drawn together when the magnetic force is withdrawn the contact breaks.

Side-mounted level switch :A hermetically sealed-in-glass reed switch located inside the stem is actuated by a magnet in the tailpiece of the float, when the float moves upward due to rise of liquid level. When the liquid level falls the float moves downward, the

Magnet

Tail Piece

Stem

Red Switch

Float

SIDE MOUNTED

Salient Features :Ø Reed-Switch actuated level switches work on the principle of magnetic �ux linkage and therefore they are

glandless and leak-proof instruments.Ø No Power Consumption.Ø Contacts are potential free, NO, NC or CO contacts can be provided.Ø Practically no maintenance is required except periodic cleaning.Ø As reed-switches are inside metallic tube-guide pipe, protected from mechanical damage.Ø As the reed switches are "hermetically sealed-in -glass," under an inert gas atmosphere' contacts are protected

from contamination.Ø Reed switches have Rhodium on contacts with low contact resistance.Ø Wherever Low Voltages are available 24V or less Reed-Switch actuated level switches may be used directly,

Otherwise it should be used in conjuction with our "Electronic control Unit." This ensures enhanced life of the level switch.

Ø Wide operating temperature range from-40 deg. C to + 200 deg. CØ Reed-Actuated level switches are ideal where vibration is involved.Ø In a single level switch we offer a maximum of 5 level sensing.Ø For highly viscous liquids heavy �oats with te�on coated guide pipes are available.

SINCE 1992

311 Sagar Industrial Estate, Near Toll Naka, Dahisar (East), Mumbai - 400 068, Maharashtra, India.Tel.: +91 - 22 - 22 - 2848 1285 / 2896 4612 | Fax: +91 - 22 - 2848 1285 | E-mail: maha.laxmi@vsnl.com | Website: www.mahalaxmiinstruments.com

ALL DIMENSIONS ARE IN MILLIMETRE (TOLERANCE - ± 2 MM)

25

HEX 19A/F

28 f

102 15

1/4" BSP(M)

Teflon Gasket

35

Model (SMT-16m) side mounted subminiature level switch.Material of construction-SS 316.Float diameter-28mm.Process connection- 1/4" BSP(M) thread with locknut.PTFE Te�on gasket.Mounting Hole diameter-13mm.SPST Reedswitch rated 100VA, maximum switching voltage-230 VAC/300 VDC, maximum switching current-1 Amp.With 1 Metre long 19/36 SWG Te�on insulated �ying extension leads.Maximum working pressure- 4 kg/sq.cm &Temperature-125 deg C.Speci�c gravity-0.5

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Model (SMT-16)

Model (SMT-16) side mounted miniature level switch.Material of construction-SS 316.Float diameter-48mm.Process connection-1/4" BSP(M) thread with locknut.PTFE Te�on gasket.Mounting Hole diameter-13mm.SPST Reedswitch rated 100 VA, maximum switching voltage-230 VAC/ 300 VDC,maximum switching current-3 Amp.With 1 Metre long 19/36 SWG Te�on insulated �ying extension leads. Maximum working pressure- 4 kg/sq.cm & Temperature-125 deg C.Speci�c gravity-0.5

ALL DIMENSIONS ARE IN MILLIMETRE (TOLERANCE - ± 2 MM)

30

HEX 22A/F

46 f

14020

1/4" BSP(M)

Teflon Gasket

45

SPDT RED WIRE - COM.RED & BLACK - NCRED & YELLOW - NO

Model (SMT-04-F82)

Model (SMT-04-F82) or (SMT-04-F92) side mounted miniature level switch. 82 or 92mm square �ange with 4 bolt holes of 10/14mm dia on 82 or 92mm PCD respectively.Material of construction-SS 304(For wetted parts in SS 316 please denote by 16 instead of 04 in the Model).Float diameter-48mm. SPDT Reedswitch rated 60 VA.maximum switching voltage-230 VAC/200 VDC,maximum switching current-3 Amp.Bakelite terminal with SS 304 enclosure having neoprene gromet for cable entry.Maximum working pressure-10 kg/sq.cm & Temperature-125 deg C.Speci�c gravity-Down to 0.5

ALL DIMENSIONS ARE IN MILLIMETRE (TOLERANCE - ± 2 MM)

Model (SMT-16m)

SINCE 1992

311 Sagar Industrial Estate, Near Toll Naka, Dahisar (East), Mumbai - 400 068, Maharashtra, India.Tel.: +91 - 22 - 22 - 2848 1285 / 2896 4612 | Fax: +91 - 22 - 2848 1285 | E-mail: maha.laxmi@vsnl.com | Website: www.mahalaxmiinstruments.com

ALL DIMENSIONS ARE IN MILLIMETRE (TOLERANCE - ± 2 MM)

Model (SMT-04-F82-FLP) or (SMT-04-F92-FLP) side mounted miniature level switch. 82 or 92mm square �ange with 4 bolt holes of 10/14mm dia on 82 or 92mm PCD respectively.Material of construction-SS 304(For wetted parts in SS 316 please denote by 16 instead of 04 in the Model).Float diameter-48mm. SPDT Reedswitch rated 60 VA.maximum switching voltage-230 VAC/200 VDC,maximum switching current-3 Amp.Bakelite terminal with cast aluminium �ameproof/weather proof enclosure conforming to IS 2148-2004 Gr II A & B gases. Flameproof cable gland supplied as optional only. Maximum working pressure-10 kg/sq.cm & Temperature-125 deg C.Speci�c gravity-Down to 0.5

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Model (SMT-04-F82-FLP)

Model (SMT-16-PG9-1.5)

Model (SMT-16-PG9-1.5) side mounted miniature level switch.Material of construction-SS 316.Float diameter-48mm.Process connection- 1.1/2" BSP(M) thread.SPST R eedswitch rated 60 VA(SPDT rated 60VA rat ing optional),maximum switching voltage-230 VAC/300 VDC,maximum switching current-3 Amp.Terminal enclosure conforming to DIN 43650 plug & socket. Maximum working pressure-4 kg/sq.cm & Temperature-125 deg C.Speci�c gravity-Down to 0.5

For Longer Life we strongly recommend to use reedswitch operated level switches on 24 V or below. On higher voltages upto 230 VAC /110 VDC a relay must always be used in conjunction with the level switch.

CAUTION :

Contact Protection must always be observed i.e., arc suppressors/snubber/Current limiting resistor must be used wherever necessary.

Do not test level switches with series lamps. Test them with continuity Testers only. While mounting cable entry should face downwords only.

® Product development being a continuous feature dimensions are likely to change without notice.