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Capacitance Type Level Switch
Capacitance Type Level Sensor
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. 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
It must be ensured that the probe is parallel to the tank wall throughout it's length.
Salient Features :
ï¿ 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.
ï¿ No moving parts, it is rugged and robust instrument.
ï¿ No dead band or dead zone like float based/ultrasonic instruments.
ï¿ 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).
ï¿ Plug and play with reference probe and rod.
Remote electronics as option with 2 Metre long coaxial cable.
ï¿ Standard enclosure weather proof-cast Aluminium or Nylon 66. Flame proof as optional.
ï¿ Trim-Pots for span and zero adjustment.
ï¿ Our new introduction is Micro processor based Blind Transmitter (available only in weather proof
with Push Button Teach-in facility and damping arrangement.