SKG 420 JOLA continuous level switch

Description

The SKG 420 continuous level switch JOLA is suitable for monitoring/signalling or continuous adjustment of liquid level. If desired, the fluid level can also be displayed via an ammeter. The switching mode varies depending on whether the actual value rises above or falls below the set minimum or maximum value. The Federal Level Switch is intended for installation as a switch in a cabinet or for mounting in a suitably protected enclosure and must not be installed in other locations. Suitable for use in clean environments only.

Mode of operation

The SKG 420 is suitable for supplying a two-wire level indicator for a 4 … 20 mA loop current signal. The level indicator is connected to the + 24 V and I terminals of the SKG 420.

Additional SKG 420, ZKG 420 or VKG 420-1020 switchgear units can be installed in the current loop (terminal I and GND).

The encoder switch can be used to set a limit value in the range 0 to 99%.

If the input value is below the set limit value, the output relay is energised.

If the input value is above the set limit value, the output relay is not energised (quiescent current principle).

The switching status of the output relay is indicated by an LED.

SKG 420 features

• alternative supply voltages: 230, 240, 115, 24 V AC or 24, 12 V DC (see datasheet for details)
• input power: approx. 3 VA
• Level controller: 24 V DC, max. 25 mA, short-circuit protected
• input signal: 4 … 20 mA or 2 … 10 V
• input resistance: current input 50 Ω, voltage input 200 kΩ
• switching limit point setting: via 1 encoder switch in the range 0 … 99%
• toggle status indicator: 2 red LEDs to indicate whether the limit value is exceeded or not reached
• reproducibility: approx. 1%
• control circuit: 1 single-pole potential-free switching contact, quiescent current principle; operating current principle on request
• 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
• protection class: IP20
• installation method: U-bolt fixing according to DIN 46277 and DIN EN 50022 or fixing via two holes
• temperature range: – 20 °C to + 60 °C

More technical information can be found under the Documentation tab in the attached pdf documents.

Use

The SKG 420 switching unit supplies a two-wire level indicator for a 4 … 20 mA loop current signal. If necessary, the liquid signal (4 … 20 mA) of the liquid level indicator can be displayed via the ammeter. The SKG 420 switching unit shall change its switching status if the actual value rises above or falls below the set minimum or maximum value.