Assembly ends

Glass-fibre reinforced polyamide based (PA) technopolymer, black colour.


Aluminium in natural colour.

Graduated contrast screen

White lacquered aluminium. It can be taken out before assembly to allow the insertion of level lines or words.


Technopolymer, black colour, with a built-in magnetic element to activate the electric contact when the float reaches the contact threshold located at about 55 mm above the axis of the lower screw (data referred to mineral oil type CB68, according to ISO 3498, temperature 23°C).


In polyamide based (PA) technopolymer. Essential in cases where the reservoir is made out of ferromagnetic material in order to prevent the interaction between the magnet and the metal mass of the reservoir.

Bracket with sensors

Watertight glass-fibre reinforced polyamide based (PA) technopolymer, black colour.

Swivelling connector

With built-in cable gland and contact holder. Front or axial output (high or low) ensuring protection against water sprays (protection class IP 65 according to table EN 60529 table-.

Standard executions

See configuration table.


Features and performances

Thanks to the side output of the connector, HCK-E-ST/STL level indicator allows to minimise the level of intervention of the sensor.

Technical data

In laboratory tests carried out for a relatively limited time with the following liquids at a temperature of 23° C: mineral oil type CB68 (according to ISO 3498) for HCK, mineral oil type CB68 (according to ISO 3498) water or water/glycol-based solutions ( 50%) for HCK-GL, the resistance values were much higher than 35 bar.

For use with other fluids and under different pressure and temperature conditions, please contact ELESA Technical Department.

In any case we suggest to verify the suitability of the product under the actual working conditions.

Functioning of the MIN level electrical sensor

  • NO: the electrical contact closes on reaching the minimum level.
  • NC: the electrical contact is opened when it reaches the minimum level.
  • SW (change-over electrical contact): the electrical contact switches between the two terminals.
Electrical featuresMIN level sensor
Tension feedAC/DC
Electric contacts

NO normally open

NC normally closed

SW change-over contact

Maximum applicable voltage

NO: 140 Vac, 200 Vdc

NC: 140 Vac, 150 Vdc

SW: 140 Vac, 150 Vdc

Maximum switching current1 A
Maximum current

NO: 1.2A

NC: 2A

SW: 2A

Maximum commutable power

NO: 10 Va

NC: 20 Va

SW: 20 Va

Cable glandPg 7 (for cables in sheath with Ø 6 or 7 mm)
Conductors cross-sectionMax. 1.5 mm2
Do not mount this indicator in proximity to magnetic fields.

Functioning of the MAX temperature sensor

  • NO: the electrical contact closes when the pre-set temperature is reached at 80°C.
  • NC: the electrical contact opens when the pre-set temperature at 80°C is reached.
Electrical featuresMAX temperature sensor
Tension feedAC/DC
Electric contacts

NO normally open

NC normally closed

Voltage /

Maximum current

250 Vac - 2 A(resisteve loads)
115 Vac- 3A
24 Vdc - 3 A
12 Vdc - 4 A
Minimum current50 mA
Cable glandPg 7 (for cables in sheath with Ø 6 or 7 mm)
Conductors cross-sectionMax. 1.5 mm2

Functioning of the temperature electrical probe

The working principle of the temperature probe is to measure the variation of resistance of a platinum element: 100 ohm = 0°C, 138.4 ohm = 100°C.

The function between temperature (T) and resistance (R) is approximately linear over a small temperature range: for example, if you assume that it is linear over the 0° to 100°C range, the error at 50°C is 0.4°C.

For precision measurement, it is necessary to linearise the resistance to give an accurate temperature. The most recent definition of the function between resistance and temperature is International Temperature Standard 90 (ITS-90). The function between resistance and temperature, obtained in laboratory tests, measuring directly the resistance value on the contacts is shown in the graph. We suggest, anyway, to set the system in order to compensate both heat dissipation and cable resistance.


A 1°C temperature change will cause a 0.384 ohm change in resistance, so even a small error in measurement of the resistance (for example, the resistance of the wires leading to the sensor) can cause a large error in the measurement of the temperature.

Because of the low signal levels, it is important to keep any cables away from electric cables, motors, switchgear and other devices that may emit magnetic or electrical noise. Using screened cable, with the screen grounded at one end, may help to reduce interference.

When using long cables, it is necessary to check that the measuring equipment is able to handle the cable resistance.

Electrical featuresTemperature probe
Tension feedAC/DC
Maximum current1mA
Cable glandPg 7 (for cables in sheath with Ø 6 or 7 mm)
Conductors cross-sectionMax. 1.5 mm2
Do not mount this indicator in proximity to magnetic fields.

Special executions on request

  • Column level window in transparent methylmatacrylate (PMMA) for max 70°C use.
  • Indicators with level visibility (e) up to 1 429 mm and fixing holes with hole centre distance (f) up to 1500 mm.
  • Packing rings in special material depending on the customer's needs.
  • Special screw with nickel-plated brass tap to be fitted to the lower assembly end for any maintenance operation requiring the indicator exclusion.

Connector assembly instructions

  1. Remove the connector from the indicator by unscrewing the set screw placed on the connector, take the contact holders out and loosen the cable gland.
  2. See Fig.3 to proceed with the wiring according to the chosen product.
  3. Assemble by pressing the contact holder into the connector in the required position.
  4. Screw the connectors to the indicator and then tighten the cable glands.


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