| Top Mounted Float Operated Level Transmitter |
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| Principle of Operation : |
| Mahalaxmi make level transmitter works on the principle of reed resistance/permanent magnet basis. Reedswitches 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 reedswitches 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. |
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| 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. |
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| Specific Gravity |
Suitable Down to 0.7 (Upto 0.5 optional) |
| Range |
0-150 mm upto 0-3000 mm. |
| Resolution |
Betterthan ±10 mm. |
| Span Suppression |
Max. 25% of Span |
| Zero Elevation |
Max. 25% of Span |
| Excitation Voltage |
12 - 36 V DC |
| Loop Resistance |
Max. 600 OHMs. |
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FIG 1 |
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| Salient Features : |
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Reedswitches are hermetically sealed-in glass under an inert gas and therefore protected from contamination. |
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Reedswitches 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. |
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Reedswitches are UL approved and ISO certified for quality management. |
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Operating temperature range of reedswitches are -40 deg. C. to 125 deg. C. |
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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 reedswitches and resistances, is solidly filled with MgO Powder. Hence this is suitable for sub zero temperatures. |
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Reedswitches are protected against mechanical damage and contact corrosion & vibration. |
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Since an outer protection tube is provided (for applications like LPG, where external cage is not possible) the reedswitch sensor assembly can be replaced without disturbing the process. |
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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. |
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Above all float is the only moving part. No wear and tear. |
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| Application : |
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Applicable in environment with high temp., high pressure, strong acid, strong alkaline and hazardous locations. |
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Multiple applications for textile dyeing, sewage water processing, power generating, boiler and petrochemical industries. |
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| LED & DIGITAL LEVEL INDICATORS |
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| Level Indicators are of light weight, compact, rugged & field proven. All Indicators are provided with span & zero adjustment. Current consumption shall be between a few Microamperes to Milliamperes depending upon the model. |
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| LED Type Level Indicators |
Model LLI-10 & LLI -12 |
| Overall Dimension |
48 x 96 x 60 or 110 mm |
| Mains Power Supply |
230 VAC /12 or 24 VDC |
| Input Signal |
3-wire-Resistance from Transmitter (Resistance Value depends on Range) |
| Display |
3 mm dia LED-11 nos- 10 for Level and 1 for Power On. |
| Range |
0 to 100%, in 10 equal steps of Height i.e, Millimetres or Litres |
| Mountin |
Flush Panel or Projection |
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| Level Indicator |
Model DPI-480 |
| Overall Dimension |
48 x 96 x 60 or 110 mm |
| Mains Power Supply |
230 VAC / 24 VDC |
| Input Signal |
4 to 20 mA |
| Loop Supply |
24VDC - Built in |
| Display |
0.5" Seven Segment LED, 3 1/2" or 4 digits. |
| Unit of Display |
0-100%, Millimetres, Litres as required |
| Mounting |
Flush Panel |
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| Level Indicator |
Model DPI-48 |
| Overall Dimension |
48 x 96 x 60 or 110 mm |
| Mains Power Supply |
230 VAC / 24 VDC |
| Input Signal |
Resistance |
| Display |
0.5" Seven Segment LED, 3 1/2" or 4 digits. |
| Unit of Display |
Millimetre i.e., Height of Liquid column. |
| Mounting |
Flush Panel |
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| Level Indicating Controller |
Model LC 504/2F |
| Overall Dimension |
96 x 96 x 110 mm |
| Mains Power Supply |
230 VAC /12 or 24 VDC |
| Input Signal |
4 to 20 mA |
| Display |
0.5", Seven Segment LED, 3 1/2" or 4 digits. |
| Unit of Display |
0-100% /Millimetres / Litres |
| No of Set Points |
2 |
| Set Point adjustment |
Push Button / Potentiometer |
| Output |
2 change over Relay contacts-rated 5 Amps at 230 VAC resistive. |
| Mounting |
Flush Panel |
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