Série KRégulateur de niveau usage intensif (flotteur à câble suspendu)

Détecteur à flotteur compact de 75 mm, à trois fils, pour une détection et un contrôle de niveau monopoint très précis et répétables. Cellule de flotteur en polypropylène hermétiquement scellée, avec câble caoutchouc CPE, sans mercure ni plomb. Idéal pour l’eau, l’eau de mer, la plupart des solutions acides et alcalines, ainsi que les effluents ou les eaux usées : le flotteur en forme de goutte n’a ni épaulements ni arêtes où les solides pourraient s’accumuler.

Série K

Caractéristiques

  • Commutation à faible différentiel
  • Action d’inclinaison toutes positions (déclenche à 45°)
  • Interrupteur monopoint S.P.D.T. trois fils
  • Construction en polypropylène, SAN, fluorosilicone et CPE
  • Large gamme de longueurs de câble disponibles (4 / 6 / 10 / 20 / 30 / 50 m)
  • Action de commutation stable et répétable
  • Aucun composant mercure ou plomb
  • Format compact, flotteur de 75 mm de diamètre
  • Indice IP68
  • Variation de niveau de liquide de 35 mm pour actionner l’interrupteur
  • Immersion maximale de 30 m (pression statique de 300 kPa)
  • Contrepoids de câble KCW en option disponible

Le régulateur de niveau de la série K contient une bille lourde en équilibre sur le bras d’actionnement d’un interrupteur de haute précision. Lorsqu’un niveau de liquide montant soulève et incline le flotteur, le centre de gravité de la bille s’éloigne de l’axe d’actionnement de l’interrupteur et l’interrupteur se désactive ; lorsque le niveau baisse, le flotteur se redresse et l’interrupteur s’actionne de nouveau. Le flotteur n’a besoin de s’incliner que de 45° dans n’importe quelle direction pour que l’interrupteur fonctionne. Il est construit en polypropylène et en câble CPE trois conducteurs très souple, avec une chambre de flotteur à double moulage hermétiquement scellée et une barrière à double moulage en polypropylène plein scellant l’entrée du câble. L’interrupteur est un dispositif unipolaire bidirectionnel de précision calibré de 5 à 500 V CA jusqu’à 15 A en charge résistive (10 A à 500 V CA) ; le courant de charge est limité à 6 A par le câble de 0,75 mm². Utilisez un contrepoids de câble KCW séparé sur le câble pour fixer le point de pivotement de commutation. Calibré pour la tension secteur, mais Kelco recommande de ne l’utiliser qu’en basse tension, de préférence 24 à 48 V CA.

Sélectionner un modèle

Fonctionnement de la série K

Deux flotteurs avec un circuit à relais auto-maintenu (voir la note d’application série K : circuit à relais auto-maintenu) démarrent la pompe au niveau haut et l’arrêtent au niveau bas. Chaque flotteur commute pour une variation de niveau de 35 mm.

Commande — Modèles disponibles

RéférenceDescription
K4MK Series float switch — 4 m of CPE cable
K6MK Series float switch — 6 m of CPE cable
K10MK Series float switch — 10 m of CPE cable (most common)
K20MK Series float switch — 20 m of CPE cable
K30MK Series float switch — 30 m of CPE cable
K50MK Series float switch — 50 m of CPE cable

Limites de fonctionnement

Maximum submergence30 m / 300 kPa static pressure
Maximum liquid temperature60 °C
Minimum liquid temperature-20 °C
Liquid specific gravity> 0.82
Liquid pH range1 to 14
Smallest well diameterWithin a 160 mm inside diameter vertically mounted pipe
Liquid level change for switch operation35 mm
Closest switching point to tank floor50 mm
Smallest opening through which the switch will fit75 mm
Minimum distance from float to closest tether/weight150 mm
Suitability — sodium hypochloriteFully compatible
Suitability — sea waterFully compatible
Suitability — potable waterFully compatible

Données électriques

Switch typeSingle pole double throw (S.P.D.T.), silver alloy contacts, 0.5 mm gap
Contact resistance15 milliohms maximum (initial)
Rated voltage (switch)125, 250 and 500 VAC; 8, 14, 30, 125 and 250 VDC
Operating voltage (safety note)Rated for mains voltage operation, but only ever operate at low voltage, preferably 24 to 48 VAC. Where mains operation is unavoidable, install an earth leakage circuit breaker in the control circuit.
Resistive AC current rating15 A at 250 VAC, 15 A at 125 VAC (10 A at 500 VAC)
Motor load AC current ratingNO 2.5 A / NC 5 A at 125 VAC (⅛ HP); NO 1.5 A / NC 3 A at 250 VAC (¼ HP)
Resistive DC current rating15 A at 8 and 14 VDC, 6 A at 30 VDC, 0.5 A at 125 VDC, 0.25 A at 250 VDC
Maximum lamp load ACNO 1.25 A / NC 2.5 A at 250 VAC
Maximum lamp load DCNO 1.5 A / NC 3 A at 30 VDC
Minimum operating load160 mA at 5 VDC
Low-current inputsThe 160 mA at 5 VDC minimum is the microswitch manufacturer's rating for guaranteed contact at very low currents. K Series switches are also used on PLC, BMS and 24 VDC control inputs. For a dedicated low-current signal input, the KP-10 reed probe and the L-L side-entry switch (gold contacts) are designed for that duty.
Maximum operating frequency, electrical20 operations per minute
Dielectric strength between contacts1000 VAC, 50/60 Hz for 1 minute
Dielectric strength to ground2000 VAC, 50/60 Hz for 1 minute
Insulation resistance100 megohms minimum (at 500 VDC)
Mechanical life expectancy10 000 000 operations minimum
Electrical life expectancy500 000 operations minimum
Approved standardsUL1054 E41515, CSA C22.2 No. 55 (File No. LR21642)
Product load current6 A maximum (limited by the 0.75 mm² cable)

Dimensions

Dimensions Série K
Cable-suspended pendant float — 75 mm diameter × 109 mm tall teardrop float, 35 mm vertical level change between trip points; 150 mm minimum from cable tether/weight to float for proper tilt action. 3-core cable: blue (common), black (NC), brown (NO).

Typical Applications

Basic liquid level control; multi-point level control; sewage level control; chemical level control; high & low level alarms; self-powered signalling; pump protection; alarms, pump control (direct or through a contactor or relay), and PLC / BMS inputs.

KCW Cable Weight (separate accessory)

Heavy polypropylene cable weights are available to suit the K Series. Clamp the weight onto the cable using the screw provided and position it at least 150 mm above the float; several weights can be spaced along the cable if required. The KCW is a split-style polypropylene cable weight (with 316 stainless screw) that clamps to the K-series cable to act as the tether/pivot for the float’s tilt action. Use the KCW when the float is suspended down a deep tank or sump from above; without it, the cable must be tethered manually. For Q Series, order the matching QCW.

Safety — Low Voltage Recommended

The K Series is rated for mains voltage operation (5 to 500 VAC), but Kelco recommends it is only ever operated at low voltage, preferably 24 to 48 VAC, with the installation isolated by a low voltage transformer. Local regulations may require its use to be confined to low voltage control circuits. Where mains operation is unavoidable, an earth leakage circuit breaker should always be installed in the control circuit. Wiring must always be carried out by a qualified, licensed electrician in line with AS/NZS (or equivalent) standards and local wiring rules.

Hazardous Areas

The K Series is not certified for use in hazardous areas and must not be installed in any area classified as hazardous under AS/NZS 60079.10 (Zone 0, 1, 2, 20, 21 or 22).

Operating Environment

There are no metal parts in contact with the process liquid. The K Series can be used in water, sea water, acids, alkalis and a great variety of chemical solutions, including oil, oily waste, fats and effluents of many types. Do not use it in closed vessels above 300 kPa static pressure or in submerged applications deeper than 30 m. In liquids of low specific gravity the buoyancy of the float is reduced and a proportionally higher operating differential results.

Mounting and Wiring

Avoid turbulence and any place where the float or cable will abrade against tank walls, piping or pumps, and keep the cables of adjoining switches from rubbing or tangling. Suspend the switch at least 100 mm away from tank walls and stand pipes, and allow at least 150 mm of free cable between the float and the first tethering point or cable weight so the float can swing and tilt freely. Never tie the float against a pipe or the side of the tank. Keep exposed cable out of direct sunlight: terminate it in a junction box or run it in conduit rather than draping it over the tank rim. With the float hanging vertically the core colours are blue (common), black (normally closed) and brown (normally open); when the level rises and tilts the float 45°, blue to brown closes and blue to black opens. Most installations use only the blue common and one other wire; the unused wire is live when the switch actuates and must always be isolated. Two float switches controlling the high and low levels of a tank or pit normally use a latching circuit, for pumping out of or into the tank.

Cable Data

S05RN-F 3 × 0.75 mm² cable: three cores of 24/0.2 mm plain copper, EPR insulation, core colours blue, brown and black, black CPE (chlorinated polyethylene) outer sheath, 7.0 ± 0.2 mm diameter, voltage rating 300/500 V, test voltage 2000 V / 2500 V, minimum bending radius 6 × overall diameter (42 mm), conductor operating temperature -30 °C to +60 °C (85 °C max.), CENELEC HD 22.4 S4 & VDE 0282-4/2005, conductor resistance 26.7 Ω/km max. per core at 20 °C, cable current rating 6 A max. (cable limited), maximum suspended length approx. 45 m (cable only). Cable lengths available: 4, 6, 10, 20, 30 and 50 m.

Maintenance

Unité scellée — non entretenable en interne par l’utilisateur. Longueurs de câble de rechange et contrepoids KCW disponibles auprès de Kelco Engineering ou de votre distributeur.

Autres modèles dans Détecteurs à flotteur