HCX-E-STL Column level indicators with MIN level electrical sensor and temperature electrical probe, technopolymer


  • RoHS
  • IP65
  • PA-T
  • PA
  • g9030

Description

Main specifications

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.

Screw, nuts and washers

Zinc-plated steel.

Packing rings

NBR synthetic rubber O-Ring.
Suggested roughness of the packing ring application surface Ra = 3 µm.

Float

Polyamide based (PA) expanded technopolymer, black colour, with a built-in magnetic element to activate the electric contact when the oil level drops to a minimum; alarm threshold located at about 50 mm from the centre of the lower nut (in presence of mineral oil type CB68, according to ISO 3498, at 23°C).

Sensor bracket

Watertight in polypropylene based (PP) technopolymer, black colour, with a built-in relay (reed) with two conductors wired to the two-pin connector.
For a correct assembly see Warnings.

Temperature electrical probe

Zinc-plated steel screw with built-in probe. The probe is made out of a platinum resistor whose ohmic resistance changes according to the temperature.

Swivelling two-pin connectors

With built-in cable glands and contact holders. Front or side output (right or left) including protection against water sprays (protection class IP 65 according to EN 60529 table that can be increased during installation with the necessary adjustments. Flat NBR synthetic rubber packing rings.

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

  • HCX-E-STL-NO: with electrical contact normally open.
  • HCX-E-STL-NC: with electrical contact normally closed.

Mounting

When fitting is not possible from the inside of the reservoir and the walls are not thick enough, the screws can be used together with Fast Mounting Kit.

Maximum continuous working temperature

90°C (with oil).

General information

Features and performances

This column level indicator generates an electric signal when the oil goes down to the minimum level allowed and an analogic electric signal of the oil temperature.

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 13 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.

Electrical features

Functioning of the MIN level electrical sensor

  • HCX-E-STL-NO: the electrical circuit is closed when the minimum level is reached.
  • HCX-E-STL-NC: the electrical circuit is open when the minimum level is reached.

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 featuresMIN level sensor
Tension feedAC/DC
Electric contactsNO normally open
NC normally closed
Maximum applicable voltageNO: 150 Vac, 100 Vdc
NC: 150 Vac, 150 Vdc
Maximum switching current1 A
Maximum currentNO: 1A
NC: 2A
Maximum switching powerNO: 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.

Electrical featuresTemperature probe
Tension feedDC
Maximum current2 mA
Cable glandPg 7 (for cables in sheath with Ø 6 or 7 mm)
Conductors cross-sectionMax. 1.5 mm2

Other executions

Special executions on request

UV resistant transparent technopolymer indicators.

Instructions of use

Two-pin connectors assembly instructions

  1. Remove the connectors from the indicator by unscrewing the set screw placed in the bottom, take the contact holders out and loosen the cable glands.
  2. Slip on the two-pole cable into the connectors (standard connectors) and connect the wires to the terminals nr. 1 and nr. 2 of the relative contact holders.
  3. Assemble by pressing the contact holders into the realtive connectors in the required position.
  4. Screw the connectors to the indicator and then tighten the cable glands.

Column level indicators with MIN level electrical sensor and temperature electrical probe, technopolymer HCX-E-STL
Column level indicators with MIN level electrical sensor and temperature electrical probe, technopolymer HCX-E-STL
HCX-E-STL
Filter
Code Description f d A B C H l e h1 h2 l l1 m r r1 s d'-0.2 f'±0.2 C#
[Nm]
Weight
11156 HCX.127-E-STL-NO-M12 127 M12 23 20 31.5 25 202 101 21 54 50 40 25 13 32.5 22 12.5 127 12 236
11157 HCX.127-E-STL-NC-M12 127 M12 23 20 31.5 25 202 101 21 54 50 40 25 13 32.5 22 12.5 127 12 236
11158 HCX.254-E-STL-NO-M12 254 M12 23 20 31 25 328 228 21 54 50 40 25 13 32.5 22 12.5 254 12 263
11159 HCX.254-E-STL-NC-M12 254 M12 23 20 31 25 328 228 21 54 50 40 25 13 32.5 22 12.5 254 12 263