HCV-E-STL Column level indicators

with MIN level electrical sensor and temperature electrical probe

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Prodotti con inserti metallici o integrali in acciaio inossidabile

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Material

Transparent polyamide based (PA-T) technopolymer. Highly resistant to shocks, solvents, oils with additives, aliphatic and aromatic hydrocarbons, petrol, naphtha, phosphoric esters.

Avoid contact with alcohol or detergents containing alcohol.

Screws, nuts and washers

Zinc-plated steel.

Packing rings

Step-shaped for the seal on the reservoir walls and NBR synthetic rubber O-ring screw underhead.

Suggested roughness of the packing ring application surface Ra = 3 µm.

Float

Glass-fibre reinforced polyamide based (PA) technopolymer, black colour, with a built-in magnetic element to activate the electric contact when the float reaches the contact threshold located at about 50 mm above the axis of the lower screw (data referred to mineral oil type CB68, according to ISO 3498, temperature 23°C).

Bracket with level sensor and temperature probe

Watertight in glass-fibre reinforced polyamide based (PA) technopolymer, black colour, with a built-in relay (reed) with two conductors and a temperature electrical probe, made out of a platinum resistor whose ohmic resistance changes according to the temperature.

For a correct assembly seeᅠWarnings.

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 tableᅠIEC 529).

Contrast screen

White lacquered aluminium. The housing, in the appropriate external rear slot, guarantees the best protection from direct contact with fluid.

It can be taken out from the inclined side, before assembly to allow the insertion of level lines or words.

Standard executions

  • HCV-E-STL-NO:ᅠwith electric contact normally open (NO).
  • HCV-E-STL-NC:ᅠwith electric contact normally closed (NC).

Maximum continuous working temperature

90°C (with oil).

Features and performances

In addition to the visual control, HCV-E-STL column level indicator generates an electric signal when the oil level drops to a minimum and an analogic electric signal of the oil temperature.

Ultrasound welding to guarantee a perfect seal.

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

Maximum fluid level visibility even from side positions.

Lens effect for a better visibility of the fluid level.

Technical data

In laboratory tests carried out with mineral oil type CB68 (according to ISO 3498) at 23°C for a limited period of time, the weld stood up to: 18 bar (HCV.127) 12 bar (HCV.254).

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

  • HCV-E-STL-NO:ᅠthe electrical contact closes on reaching the minimum level.
  • HCV-E-STL-NC:ᅠthe electrical contact is opened when it reaches the minimum level.
Electrical featuresMIN level sensor
Tension feedAC/DC
Electric contacts

NO normally open

NC normally closed

Maximum applicable voltage

NO: 140 Vac, 200 Vdc

NC: 140Vac, 150 Vdc

Maximum switching current1 A
Maximum current

NO: 1.2A

NC: 2A

Maximum commutable power

NO: 10 Va

NC: 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 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

  • Level indicators with stainless steel screws, nuts and washers.
  • Level indicators for use with fluids containing alcohol.
  • UV resistant transparent technopolymer indicators.

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. Slip on the cable into the connector (standard connector) and connect the wires to the terminals 1 and 2 for the functioning of the MIN level sensor, to the terminals 3 and earth for the functioning of the temperature probe.
  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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