Conductivity level switchCoFox® ELT 8

Description

Aplication

Suitable for use with electrically conductive liquids whose level is to be limited or controlled. The liquids such as water, emulsions or waste water must neither foam excessively nor be viscous or adhesive (bridging). CoFox® ELT 8 can be operated with one probe as a level switch or with two probes for con-trolling pumps, vales, etc (start/stop). Can also be used as a water alarm unit, for example in control stations or IT rooms, in conjunction with floor water probe BWS 10-1.

Description

Level switch in wall mounting housing with visual alarm and operation indicator. CoFox® ELT 8 is designed for continuous operation and operates on the basis of conductivity. If a probe electrode is in contact with the liquid, this closes a circuit to the tank wall or to a second electrode via the liquid. The relay outputs switch. The sensitivity is adjustable. 2 voltage-free relay contacts are provided for switching functions.

Switching functions

Level switch: The relay can be set to either energise or de-energise when the probe rod comes into contact with or loses contact with the liquid. The switching point must be adjusted according to the conductivity of the liquid. Level control for filling: A minimum of 2 probe rods are required. Set the internal switch to “Max” (H). The relay energises when the min. probe loses contact with the liquid. Relay de-energises when the max. probe comes into contact with the liquid. Level control for emptying: A minimum of 2 probe rods are required. Set the internal switch to “Min” (L). The relay energises when the max. and min. probes have contact with the liquid. The relay de-en-ergises when the min. probe loses contact with the liquid.

Technical specifications

Response threshold: 2.5 kOhm – 60 kOhm fully adjustable

Operating temperature range: Ambient: -10/+60 °C

Supply voltage: AC 230 V or DC 24 V

Power input: 4 VA (AC 230 V)2 VA (DC 24 V)

Probe circuit: Max. AC 3 V

Switching outputs: Relay contact: 2 voltage-free changeover contacts Contact rating: AC 250 V, 2 A

Visual indication: Green LED: Mains 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 made of impact-resistant plastic (ABS)W x H x D: 53 x 113 x 108 mm

Degree of protection: IP 30 (EN 60529)

Scope of delivery: Level switch without probe