HIQUEL TCL Application Instructions

HIQUEL GmbH

TCL/PCL application instruction

Function

For supervising and/or controlling fill factors electronic level indicators/controls are required.
Our products with the following type designations represent such devices: TCL, PCL and
TCL3. Because of simplicity reasons, all these devices in this document are designated as
level controls. In the case of differences between the devices we will deal in a separated
manner with it.

Operating range

The application of the level control requires the fulfilment of the following:
•
The liquid you want to measure must be conductive.
•
The liquid you want to measure must not be flammable.
•
The liquid you want to measure must have its conductivity within the available
measuring range.
•
Make sure that the sensor cabling is placed within a shielded cable away from AC
cabling or engine cabling.

Conductive liquids

Resistor calculation

The calculation of the resistance of the medium is possible. For this, the size of the
electrodes must be known.
1
=
R
c * p
A =
d =
c =
p =
An equivalent means the amount of molecules of the liquid. There is one positive molecule
and one negative. For example, one molecule NaCl means Na
case is 1. One molecule CaCl
Usually the size of the electrodes is not measured, but the d/A ratio is acquired when
measuring the resistance of a cell with a defined concentration and a known equivalent
conductivity. In some cases the cell constant will be necessary for measuring with the level
control.
Author: Peter Reiter
Translator: Markus Rindler
d
*
A
Size of the electrodes [cm³]
Gap of the electrodes [cm]
Concentration [val/cm³]
equivalent conductivity [Scm²/val]
means Ca
2
File:
Date:
++ -
+ 2CL the equivalent is ½.
HIQUEL_AppNote_TCL_1_E_R0100.doc
05.07.2004 12:56
Page 1
+ -
+ CL the equivalent in this