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sa capacitance level switch

principle

the capacitance level sensor measuring principle is based on the physical properties of a capacitor formed by the sensor and the vessel wall, the electric capacity is affected by the dielectric value of products. when the sensor is not covered, the dielectric constants =1 (air is usually =1) when the sensor is covered, the dielectric constant will increase in capacity, the electronic oscillator (1 mega hz radio frequency) will cr-eate a resonating signal, which will turn the unit on or off for level control purpose.

features and applications

because the capacitance level sensor has no moving parts inside the device, it is will not be affected by friction. it is suitable for powder or liquid application easy to install. the customer can choose the types below to suit his requirements.

1. standard type(sa110 & sa111 a/b/c ) suitable for general use.

2. hi-temp type (sa120 & sa128 a/b/c) suitable for high temperature environment.

3. corrosion-proof type (sa130 & sa132 a/b/c) suitable for corrosive environment.

4. remote probe type(sa140 a/b/c)or use with vibrator equipped tank.

5. wire-probe type(sa150 a/b/c) suitable for silo or deeper tank.

6. plate-probe type (sa160 a/b/c)suitable for granules and at lower position of tank side.

7. explosion-proof type (sa170d ~ sa178d)with sa-75u can be use in hazardous areas.

8. anti-static type(sa180 & sa181 a/b/c) suitable for electrostatic environment (it won"t be damaged by the electrostatic discharge)

if length of sensing probes longer than 3 meters, please chose 20pf or 40pf sensitivity type.