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Interruptores de nivel por conductividad

Designed for use with electrically conducting liquids which do not foam excessively and are not highly viscous or adhesive (bridging), e.g. water, emulsions or waste water.
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INTERRUPTORES DE NIVEL POR CONDUCTIVIDAD

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APLICACION MODELO TECNOLOGIA MARCA
Nivel CoFox® ELT 8, ELT 500/4, ELT 680, ELT 68 C - Afriso
FUNCION (Interruptor) CODIGO SECCION
Interruptores de nivel por conductividad. 02-3003 02

Conductivity level switch CoFox® ELT 8.

Application
Designed for use with electrically conducting liquids which do not foam excessively, are not highly viscous or adhesive (bridging), e.g. water, emulsions or waste water. Also suitable as a water alarm in conjunction with floor water probe BWS 11.

Description
The CoFox® ELT 8 level controller operates on the basis of conductivity.

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 The following functions can be selected:

  • Level switch
  • Level control for filling
  • Level control for emptying

The sensitivity is adjustable.
2 voltage-free changeover contacts are provided for switching functions.
The units feature LED´s for "normal" operation and "alarm".

Switching functions
Level switch The built-in relay can be pre-set to either energise or de-energise when the probe is in contact with the liquid. Sensitivity must be adjusted according to the conductivity of the liquid.
Level control for filling A minimum of 2 probe rods are required. Set internal switch to "max" (H). The relay energises when the min. probe loses contact with the liquid. The relay de-energises when the liquid reaches the max. probe.
Level control for emptying A minimum of 2 probe rods are required. Set internal switch to "min" (L). The relay energises when max. and min. probes are in contact with the liquid. The relay de-energises when the min. probe loses contact with the liquid.

Technical specifications

Adjustment range 2,5–50 kOhm (400–20 μS) Fully adjustable
Operating temperature range Ambient: -10 °C/+60 °C
Supply voltage AC 230 V
Power consumption 4 VA
Probe circuit Max. AC 3 V
Relay outputs Relay contact: 2 voltage-free changeover contacts
Contact rating: AC 250 V 500 VA DC 12 V 1 A
Visual indication Green LED normal operation Red LED alarm condition
Fail-safe mode Integrated selector for min. or max. fail-safe mode (low/high)
Housing Wall mounting housing with plug-in base, impact resistant plastic (ABS) W x H x D: 53 x 113 x 108 mm
Protection IP 30 (EN 60529)

Options

  • Supply voltage DC 24 V


Probes
The probes are not included.
Please order separately.
Select according to the operating conditions.
Special customerspecific probes are available in addition to the standard probes. 


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Conductivity alarm unit CoFox® ELT 500/4.

Application
Designed for use with electrically conducting liquids which do not foam excessively and are not highly viscous or adhesive (bridging), e.g. water, emulsions or waste water. The CoFox® ELT 500/4 alarm unit is suitable for use in large installations. Several zones (also large areas) can be monitored simultaneously with electrodes (probes) at various points.

Description
The CoFox® ELT 500/4 level controller operates on the basis of conductivity.
The electrodes connected to the switching unit monitor the status at several points. When one or several electrodes are bridged, the red LED of the corresponding electrode circuit is switched on.

For fast and precise location of the leak, a label is provided for each LED. A common voltagefree relay contact can be used to control separate alarm devices (e.g. alarm light or horn).

The described function is only activated by electrode signals which are longer than 1 second in duration. The alarm is saved and cannot be reset for the duration of the electrode signal.

The alarm condition must be cleared before the alarm can be reset by pressing the reset button on the unit. CoFox® ELT 500/4 can be used with a series of probes for large area monitoring with centralised control.

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Technical specifications

Zone monitoring 4 input circuits 
Switching threshold 50 kOhm
Operating temperature range Ambient: -10 °C/+50 °C
Supply voltage AC 230 V 
Power consumption 3 VA 
Probe circuit Max. AC 3 V
Relay output Relay contact: 1 voltage-free changeover contact
Contact rating: AC 250 V, 500 A
Visual indication Yellow LED power "on" 4 red LEDs alarm condition

Housing

Wall mounting housing with plug-in base, impact resistant plastic (ABS)
W x H x D: 53 x 113 x 108 mm

Protection IP 30 (EN 60529)

Probes

The probes are not included. Please order separately.
Select according to the operating conditions.
Special customer-specific probes are available in addition to the standard probes. 
 

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Conductivity level switch CoFox® ELT 680.

Application
Suitable for use with electrically conducting materials, predominantly liquids, e.g. milk, wine, fruit juices, waste water or lyes. Also suitable for foaming or adhesive media, e.g. beer or yoghurt. Specially designed for applications in the food industry.

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Description
The CoFox® ELT 680 level controller operates on the basis of conductivity. The built-in timer can be set to avoid undesired switching as a result of surface turbulences. The sensitivity and adjustment range of the controller have been designed to ignore bridging resistances which could impair the reliability of the unit (e.g. foam across the electrode insulators in breweries, dairies and ice-cream plants). Furthermore, the unit is capable of interface detection between liquids with different levels of conductivity (e.g. water and milk) in pipes and tanks.

Switching functions
The unit can be used with either one electrode as a single point controller or with two electrodes for pump "on-off" control.

Technical specifications

Adjustment range
Variable adjustment
Range HR 1 kOhm to 100 kOhm
Range LR 50 Ohm to 2,000 Ohm
Operating temperature range Ambient: -10 °C/+60 °C
Supply voltage DC 24 V
Power consumption 2.5 W
Probe circuit Max. AC 3 V
Relay output Relay contact: 1 voltage-free changeover contact
Contact rating: AC 250 V 750 VA DC 12 V 1 A
Visual indication Green LED power "on"
Timer Adjustable form 0 to 20 s
Fail-safe mode Integrated selector for min. or max. fail-safe mode (low/high)
Housing Standard DIN-rail housing made of impact resistant plastic (ABS) W x H x D: 73 x 55 x 112 mm
Protection IP 40 (EN 60529)

Options

  • Supply voltage AC 230 V Probes


The probes are not included.
Please order separately.
Select according to the operating conditions.
Special customer-specific probes are available in addition to the standard probes.
 

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