HIQUEL TCL User Manual

HIQUEL GmbH Page 1
Author: Peter Reiter File: HIQUEL_AppNote_TCL_1_E_R0100.doc
Translator: Markus Rindler Date: 05.07.2004 12:56
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.
A
d
pc
R *
*
1
=
A = Size of the electrodes [cm³]
d = Gap of the electrodes [cm]
c = Concentration [val/cm³]
p = equivalent conductivity [Scm²/val]
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
+
+ CL
-
the equivalent in this
case is 1. One molecule CaCl
2
means Ca
++
+ 2CL
-
the equivalent is ½.
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.

HIQUEL TCL Specifications

General

Brand	HIQUEL
Model	TCL
Category	Control Unit
Language	English

Summary

Function

Operating Range

Conductive Liquids

Resistor Calculation

Formula and parameters for calculating liquid resistance based on electrode size and conductivity.

Function Description

Level Control with One Fill Factor (Fill)

Describes the function of the level control when filling a single-factor system.

Level Control with Two Fill Factors

Fill Operation

Operation sequence for filling in a two-factor level control system.

Deplete Operation

Operation sequence for depleting in a two-factor level control system.

Wiring and Installation

Galvanic Disconnected AC Adapter

Selection criteria for AC adapters based on receptacle grounding.

Earthing Requirements

Safety guidelines for grounding the TCL connection 'C'.

Cable Use and Shielding

Recommendations for using shielded cables and connecting shields.

Installation Precautions

Advice on avoiding interference from nearby current-leading cables.

Measuring Range

Setting Sensitivity

Level Control with One Fill Factor Calibration (Fill)

Step-by-step calibration for the one-fill-factor mode during filling.

Level Control with One Fill Factor Calibration (Deplete)

Step-by-step calibration for the one-fill-factor mode during depleting.

Level Control with Two Fill Factors Calibration (Fill)

Calibration steps for the two-fill-factor mode during filling.

Level Control with Two Fill Factors Calibration (Deplete)

Calibration steps for the two-fill-factor mode during depleting.