Application
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.
Description
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.
Technical data
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 or DC 24 V
Nominal power
4 VA or 2.5 W
Probe circuit
Max. AC 3 V
Switching output
Relay contact:
1 voltage-free changeover contact
Contact rating:
AC 250 V, 750 VA
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
