The conductive measuring principle is used for the detection of electrically
conductive liquids.
It is not suitable for the detection of electrically non-conductive liquids (e.g. oils, diesel, fuel oil, demineralised water ...). Electrically conductive liquids are generally aqueous solutions of salts, acids
or alkalis. The molecules of these substances dissociate in water into positive and negative ions which give the aqueous solution its electrical conductivity.
The conductive leakage detector of the Leckstar range consists of the combination of a conductive electrode and a conductive electrode relay. This combination detects the presence of an electrically conductive liquid at the electrodes, and an alarm signal is then emitted.
The measurement process uses alternating current to ensure exact response
sensitivity and to prevent galvanic processes at the electrodes.

Jola’s immersion probes TSR can be used for

• level control
• level indication
• limit/point level detection
• run-dry protection
• overfilling protection

Construction and operating principle
The TSR immersion probes have a probe tube with built-in reed contacts.
The float is fitted with a permanent magnet and moves freely up and down the probe tube, activating the reed contacts as it rises and falls. It should be noted that reed contacts do not lock but that they switch only for as long as they are influenced by the magnetic field. Once the float passes beyond a contact upwards or downwards, the latter returns to its original position. However, the contacts can be made to hold by using collars to limit the motion of the float.

The capacitive measuring principle is mainly used for the detection of electrically non-conductive (insulating) liquids, but it can also be used to detect electrically conductive liquids.
Electrically non-conductive liquids are generally organic liquids like oils and solvents. An electrode assembly forms a measuring capacitor, and the dielectric is either air or liquid. The dielectric constant of air is 1. The dielectric constant of the liquid to be detected is higher. For our capacitive sensors, the dielectric constant has to be higher than 2 (type CPE) or 1.8 (types OWE 2/C and COW).
The capacitive leakage detector recognises a change in the dielectric constant at the measuring capacitor and an alarm signal is emitted. The design of the measuring capacitor allows direct mounting on the floor and generally rules out the possibility of interference effects due to different subsurfaces.

Jola’s floating switches and immersion probes can be used for

• level control
• level indication
• limit/point level detection
• run-dry protection
• overfilling protection

Application area
Floating switches or immersion probes are binary contact devices / combinations of binary
contact devices used for the control of liquids.
Floating switches serve as individual switches for signalling a liquid level at a defi ned point
(e.g. high-level alarm or low-level alarm).
The combination of 2 fl oating switches or an immersion probe with 2 mounted fl oating
switches serves very often to control a pump (ON-OFF via a suitable external downstream
pump controller) or a solenoid valve (OPEN-CLOSE via a suitable external downstream
solenoid valve controller).
The use of more than 2 fl oating switches or one immersion probe with more than 2 mounted fl oating switches allows to perform more complex switching tasks (e.g. overfl ow protection, high-level alarm, pump ON, pump OFF, low-level alarm, run-dry protection).
Depending on type, the fl oating switches are designed for mounting from the side and/or
from above, the immersion probes only for mounting from above.

The conductive measuring principle is used for the detection of electrically
conductive liquids.
It is not suitable for the detection of electrically non-conductive liquids (e.g. oils, diesel, fuel oil, demineralised water ...). Electrically conductive liquids are generally aqueous solutions of salts, acids
or alkalis. The molecules of these substances dissociate in water into positive and negative ions which give the aqueous solution its electrical conductivity.
The conductive leakage detector of the Leckstar range consists of the combination of a conductive electrode and a conductive electrode relay. This combination detects the presence of an electrically conductive liquid at the electrodes, and an alarm signal is then emitted.
The measurement process uses alternating current to ensure exact response
sensitivity and to prevent galvanic processes at the electrodes.

Jola’s immersion probes TSR can be used for

• level control
• level indication
• limit/point level detection
• run-dry protection
• overfilling protection

Construction and operating principle
The TSR immersion probes have a probe tube with built-in reed contacts.
The float is fitted with a permanent magnet and moves freely up and down the probe tube, activating the reed contacts as it rises and falls. It should be noted that reed contacts do not lock but that they switch only for as long as they are influenced by the magnetic field. Once the float passes beyond a contact upwards or downwards, the latter returns to its original position. However, the contacts can be made to hold by using collars to limit the motion of the float.

The capacitive measuring principle is mainly used for the detection of electrically non-conductive (insulating) liquids, but it can also be used to detect electrically conductive liquids.
Electrically non-conductive liquids are generally organic liquids like oils and solvents. An electrode assembly forms a measuring capacitor, and the dielectric is either air or liquid. The dielectric constant of air is 1. The dielectric constant of the liquid to be detected is higher. For our capacitive sensors, the dielectric constant has to be higher than 2 (type CPE) or 1.8 (types OWE 2/C and COW).
The capacitive leakage detector recognises a change in the dielectric constant at the measuring capacitor and an alarm signal is emitted. The design of the measuring capacitor allows direct mounting on the floor and generally rules out the possibility of interference effects due to different subsurfaces.