SCHE 2/T/KL floating electrode JOLA

Description

The SCHE 2/T/KL JOLA floating electrode usually floats on a conductive liquid such as water. It is connected to an electrode relay, which supplies it with a low safety voltage. The height of the electrode rod is set so that the tips of the electrode rods are permanently under water. Depending on the movement of the liquid surface, the thumb electrode should be adjusted forwards or downwards. Although the rod electrode tips should be continuously under water, they should only be under water so that when a conductive liquid (water) is covered by a non-conductive liquid (such as oil), the thin layer of conductive liquid (oil) is sufficient to lift the rod electrode tips from the conductive water layer into the non-conductive oil layer, thus interrupting the current flowing from the relay electrode through the rod electrode and thus activating the alarm.

For example, if oil flows onto a calm water surface after a leak, fine adjustment of the thumb electrode ensures that the oil layer is only about 3 to 10 mm thick, which is sufficient to interrupt the control current flowing through the thumb electrode and activate the alarm.

To ensure the operation of the SCHE… floating electrode, there must be a minimum liquid level above the ground (see technical data of the individual floating electrodes). If this condition is not met, the two ends of the electrode rods will no longer be under water – in other words, they will not be electrically bridged by a conductive liquid. This will cause the usual unwanted alarm activation via the associated electrode relay. The only model with an alarm bridging contact for this option is the SCHE 2/E (ILS version).

The SCHE… floating electrode, equipped with two electrode rods, is designed for connection to an ESA 2, ESA 2/G or NR 3A electrode relay.

The above electrode relays are equipped with a response sensitivity of approximately 30 kW (approximately 33 µS). For applications during prolonged rainfall events that cause a reduction in conductivity, the response sensitivity may not be sufficient.
In this case, the electrode relays can be equipped with a higher response sensitivity of about 200 kW (about 5 µS).

Latencies SCHE 2/T/KL

• Design: 1 control electrode and 1 ground electrode
• Sensitive elements: 2 detection rods made of 316 Ti stainless steel, Ø 4 mm, covered with polyolefin shrink tube, length: approx. 45 mm, other lengths on request
• electrode rod head: PP
• Protection rating: IP67
• electrical connection: cable from TPK, in the electrode head, length: 2 m, on request: second cable, second length
• Electrode holder, stabilisation plate and supports: PP
• floats: 4 PP units, approx. 85 mm Ø
• min. conductive liquid level above ground to ensure floating electrode operation (with d = 1 g/cm3): 75 mm
• temperature range: + 8 °C to + 60 °C
• pressure resistance: for non-pressure applications
• max. length of connecting cable: 1,000 between floating electrode and electrode relay

More technical information can be found under the Documentation tab in the attached pdf documents.

Welcome to the article ”Conductive Measurement of Liquids”