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Magnetic Float Level Switch

Magnetic Float Level Switch
Magnetic Float Level Switch
Product Code : VMT-04-F40-GN-PG7
Brand Name : DB
Product Description

Magnetic Float Level Switch

Principle of Operation :

Level transmitter works on the principle of reed resistance/permanent magnet basis. Reed switches

function like the center arm (as shown in fig. 1) of a potentiometer. As per liquid level float moves up or down, magnet inside the float operates the reed switches thereby causing a change in resistance value. Change in the resistance is measured by the electronics unit and conditioned as a current output of 4 to 20 mA. Signal conditioner is head mounted and of 2-wire loop powered suitable for 12 to 24 VDC giving output of 4 to 20 mA.

Technical Specification : Our Standard Product

Model (VMT-04-F65-AW) , (VMT-04-F92-AW) top mounted magnetic reed/resistance cascade type loop powered 2 wire level transmitter. Process Connection flange 78 or 120 mm diameter with 4 bolt holes of 6mm or 14 mm dia on 65 or 92 mm PCD respectively. Wetted parts flange & float stopper in SS 304. Float material SS 316L and diameter 41, 53 or 68 mm. Operating pressure 10kg/sq.cm and Temperature 125 deg.C. Maximum.

Salient Features :

  • Reed switches are hermetically sealed-in glass under an inert gas and therefore protected from contamination.
  • Reed switches used by us are suitable for maximum working voltage of 150 VDC and current 1 Ampere.But in our circuitry they are subjected to maximum of 3 VDC and current 1 mA in case of resistance output and maximum of 24 VDC and 20 mA when used in conjunction with a signal conditioner for current output. This ensures long life of the product.
  • Reeds witches are UL approved and ISO certified for quality management.
  • Operating temperature range of reed switches are -40 deg. C. to 125 deg. C.
  • Reed Switches are enclosed in a moulded glass filled nylon capsule and therefore protected from mechanical shocks or damage. Moreover the stainless steel float-guide pipe, containing the PCB of reed switches and resistances, is solidly filled with MgO Powder. Hence this is suitable for sub zero temperatures.
  • Reed switches are protected against mechanical damage and contact corrosion & vibration.
  • Since an outer protection tube is provided (for applications like LPG, where external cage is not possible) the reed switch sensor assembly can be replaced without disturbing the process.
  • Since the float is of 200mm dia with specific gravity -0.4 (for LPG) it will have higher buoyant force. For standard applications float shall be of 48 mm Or 68 mm in diameter.
  • Above all float is the only moving part. No wear and tear.

Application :

  • Applicable in environment with high temp., high pressure, strong acid, strong alkaline an hazardous locations.
  • Multiple applications for textile dyeing, sewage water processing, power generating, boiler and petrochemical industries.
TECHNICAL SPECIFICATION
  • Specific Gravity : Suitable down to 0.7 (upto 0.5 optional)
  • Range : 0-150 mm upto 0-3000 mm.
  • Resolution : Better then ± 10 mm
  • Span suppression : Max 25 % span
  • Zero Elevation : Max 25 % span
  • Excitation voltage : 12-36 V DC
  • Loop Resistance : Max 600 OHMs.

Model

VMT-04-F40-GN-PG7

Process connection

50mm round flange with 4 nos bolt holes of 5mm dia on 40 mm PCD.

Material of construction

Flange in glass filled nylon, float in PU& Pipe in SS304

Type of switch

SPST

Switch rating

60VA

Total stem length

As per your requirement (maximum upto 1 metre)

Float

25mm dia X 25mm long

Maximum switching voltage

230 VAC

Maximum working Temperature

70ºC

Maximum working pressure

2kg/cm²

Cable entry

PG7

Wire length

1 metre standard

 

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