Mahalaxmi Instruments

Dahisar, Mumbai, Maharashtra

A capacitance is formed between the probe and the vessel wall .As the level of the measuring medium rises or falls capacitance between the probe and vessel wall changes proportionately. A high frequency sine wave is applied between the probe and tank wall. A change of medium level will induce a change in the current of the applied sine wave. Fromwhen the capacitance in the vessel increase, impedance will decrease and current will increase and vice-versa. (Z=Resistance, C=Capacitance, F= Frequency)

Head mounted electronics converts the capacitance variation to 4-20mA signal for long distance transmission. It is provided with trimpots for SPAN and ZERO adjustments. With no moving parts it is free from wear and tear, rugged and robust in construction. No dead zone like float based instruments.

It must be ensured that the probe is parallel to the tank wall throughout it's length.

While sending enquiries for capacitance type level transmitters, please furnish following informations to enable us to submit a suitable offer:

• Name of service Medium/Liquid
• Dielectric constant of the medium.
• Operating Temperature and pressure. Does the temperature vary? If so how much?
• Nature of liquid - Foaming, Viscous, Sticky etc.
• If agitation is involved whether sufficient space is available for probe between agitator and tank wall to avoid damage.
• Material of tank - Metallic or Non- Metallic
• If mounted on nozzle, height of nozzle, with tank dimensions and drawings.

Mahalaxmi make Ultrasonic Level transmitters are widely used to measure and control level of Solids and Liquids or distance of any objects. The sensor generates ultrasonic sound waves.From the time taken for the sound waves to strike the target and returnmthe Electronics computes the distance of the object and displays it in terms of distance or level-In millimeter, ln litres or a current signal of 4 to 20mA proportional to the level. The transmitter output may be connected to a PLC, Controller etc for Indication or/ and Control of level. Special electronics filter enables detection of largest target, automatically eliminating false echoes and rejecting noise clutter efficiently.

• Sensor Module imported from USA.
• Over Voltage/Surge Voltage protection.
• Reverse polarity protection.
• Direct or reverse action i.e., 4 to 20 mA or 20 to 4 mA selectable at site suitable for distance or level measurement.
• Power supply- 24 VDC
• Output: 4 to 20 mA, 3-wire & Rs485.
• Alpha-numeric LCD display.
• LCD Screen- 8 x 2 alphanumeric display green or Blue screen
• Push-Button Teach-in facility.
• Narrow beam angle of 10 degrees.
• Range 300 to 5000mm , 300 to 10000 mm.
• Dead Zone- 300mm
• Built-in Temperature compensation.
• LED Indication for Over current or under current
• Resolution-5 mm or 10mm depending on Models.
• Accuracy: + 0.25% FSD
• Updation Time- 150 mS.
• Power consumption- 1.5 Watts.
• Operating Temperature Range: - 4 to + 65 deg C.
• Enclosure: Blue Powder coated cast aluminium Flameproof or weather proof enclosure with front glass window or without glass window/Stainless Steel AISI 304 weather proof.
• Mounting: Flanged or Threaded to 2" ASA 150 Lbs Rf or 2"BSP(Male) or as required.