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CoFox® ELT 680
conductivity level switch
- specially designed for applications in the food industry
- Detection of interface layers between liquids with different levels of conductivity (product, foam)
- adjustable delay helps to avoid unwanted switching
- Contact resistance does not influence measurement
Suitable for use with electrically conductive media, predominantly liquids, e.g. milk, wine, fruit juices, waste water or lyes. Also suitable for foaming or adhesive media, e.g. beer or yoghurt.
The CoFox® ELT 680 level switch operates on the basis of conductivity. A delay can be set to avoid undesired switching as a result of surface turbulence. The sensitivity and adjustment range of the device have been designed in such a way as to keep contact resistance from impairing the reliability of the unit, e.g. caused by foam on the electrode insulator (in breweries, dairies and ice-cream plants). Furthermore, the unit is capable of interface layer detection between liquids having different levels of conductivity (e.g. water and milk) in pipes and tanks.
The unit can be operated either with one electrode as a single-point controller or with two electrodes as a dependent on-off controller.
- Adjustment range
- variable adjustment
- range HR:
- 1 kOhm to 100 kOhm
- range LR:
- 50 Ohm to 2,000 Ohm
- Operating temperature range
- Ambient:
- -10/+60 °C
- Supply voltage
- AC 230 V
- Nominal power
- 4 VA or
- probe circuit
- max. AC 3 V
- Switching output
- Relay contact:
- 1 voltage-free changeover contact
- Contact rating:
- AC 250 V, 750 VA
- Contact rating:
- DC 12 V, 1 A
- visual indication
- green LED
- time delay
- adjustable from 0 to 20 s
- Fail-safe mode
- integrated selector for min. or max. fail-safe mode (low/high)
- Housing
- DIN rail housing made of impact-resistant plastic (ABS)
- W x H x D:
- 73 x 55 x 112 mm
- Degree of protection:
- IP 40 (EN 60529)
- Scope of delivery
- Level switch without probe
