Two-Wire Capacitance Continuous Level Transmitter (Model : TLC)

The probe forms a capacitance with the metallic tank-wall. The capacitance is sum of three capacitance.

Features:

Compact size.
Rigid rod/flexible rope versions.
Wide range industrial dc power supply (15 to 60 VDC).
Loop powered device (true-two wire).
No potentiometers – hassle free calibration.
Various customized process connections like Threaded/Flanged/Hygienic etc.
Water bed sensing for oil/fuel/fatty-acid applications.
Remote electronics version available on request.
Exd version available-suitable for Gas Group IIC, T6 as per IEC 60079-1-2007 & IEC 600529-2001.

Details

The probe forms a capacitance with the metalic tank-wall.

The capacitance is sum of three capacitance:-

C(air)=ε(air) x P x (H-L)
C(material)=ε(material) x P x L
C(residual) is due to device itself.

Where ε(air) is the dielectric constant of air ≈1.
ε(material) is dielectric constant of material.
P is the constant of probe and installation, H is the active length of probe and L is the level of material.

Capacitance to level translation is performed with the aid of on-site calibration also called “wet-calibration”.

trumen The device stores a low level capacitance as level for 4mA and high level capacitance as level for 20mA as defined by the user.