NR 5 JOLA electrode relay

Description

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

Electrode relay for U-rail mounting or surface mounting, with connection terminals at the top of the housing and with 2 built-in LEDs to indicate the corresponding switching status.

The units are designed to be mounted or installed in a switch box in a suitable protective enclosure and can therefore only be installed in these locations. They are only suitable for use in clean environments.

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 of NR 5

• 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, 75 x 55 x 110 mm
• connection: terminals on the housing
• IP degree of protection: IP 20
• mounting: U-bar fixing to DIN 46277 and EN 50022 or fixing via 2 drill holes
• mounting orientation: any
• temperature range: – 20 °C to + 60 °C
• Maximum length of connection cable between relay and sensor: 1,000 m

Welcome to the article ”Conductive Measurement of Liquids”