NR 5/G JOLA electrode relay

Description

The NR 5/G electrode relay JOLA is designed for automatic level control or signalling with conductive liquids.

Electrode relay in surface-mount housing, with transparent cover and 2 built-in LEDs (inside the housing) to indicate the corresponding switching status

An on-off delay of between 0.5 and 3 seconds, depending on the conductivity of the medium, makes the units insensitive to short contacts (e.g. due to splashing) and short contact breaks.

before use, we recommend you consult the datasheet under the Documentation tab.

Mode of operation

Jola electronic relays are used for automatic control of pumps or solenoid valves, and overflow or dry-out protection in wells or tanks with conductive liquids. The liquid level is controlled by electrodes that give commands to switch to an electronic relay if they come into contact with the liquid. For a two-point control system, you need two control electrodes and one earth electrode. If you only want to signal the liquid level, the E1 control electrode and the earth electrode are sufficient. Instead of a ground electrode, you can also use the conductive metal wall of the tank as a ground connection. However, in all cases we recommend using a separate earthing electrode.

Features NR 5/G

• supply voltage: standard 230 V AC; on request: 240, 115, 24 V AC or 24, 12 V DC
• input power: approx. 3 VA
• Electrode circuit: 3 terminals (under safety extra-low voltage SELV) operating on 1 output relay with self-holding
• No-load voltage: 9 Veff 10 Hz (safety extra-low voltage SELV)
• short-circuit current: max. 0.5 mAeff
• response sensitivity: approx. 30 kOhm or approximately 33 µS (electrical conductivity)
• Control circuit: 1 single-pole potential-free switching contact with self-retaining
• Functionality: based on the principle of quiescent flow
• LED indicators: green LED (contact closed), red LED (contact open)
• switching voltage: max. 250 V AC
• switching current: max. 4 A AC
• switching power: max. 500 VA
• housing: insulating material, with 3 screw connections
• connection: internal terminals
• IP degree of protection: IP 54
• mounting: using 4 screws
• mounting orientation: any
• temperature range: – 20 °C to + 60 °C
• maximum length of connection cable between relay and sensor: 1,000 m