Capacitance Type Level Switch

• 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.
• 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. From when 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.

Salient Features :

• Two parts isolated design-Electronic Module can be easily separated without removing the probe and
• without necessity of process shut down. So module replacement is easy.
• No moving parts, it is rugged and robust instrument.
• No dead band or dead zone like float based/ultrasonic instruments.
• Suitable for operation from 12 to 32 VDC, with reverse polarity protection.
• Standard output 4-20mA.Voltage output of 0-10 optional. (For 12 V input supply output 0-5V and with 24 V supply output 0-10V).
• Plug and play with reference probe and rod.
• Remote electronics as option with 2 Metre long coaxial cable.
• Standard enclosure weather proof-cast Aluminium or Nylon 66. Flame proof as optional.
• Trim-Pots for span and zero adjustment.
• Our new introduction is Micro processor based Blind Transmitter (available only in weather proof version) with Push Button Teach-in facility and damping arrangement.