The Labkotec POP-22 EXI is an ATEX-certified level controller designed for pumping stations, oil and chemical tank monitoring, and wastewater management in potentially explosive atmospheres. Its key distinction from general-purpose level controllers is the integrated intrinsically safe input — rated II (1) G [Ex ia Ga] II C — that connects directly to sensors installed in Zone 0 hazardous areas without requiring an external galvanic isolator or Zener barrier.

What control functions do the relay outputs provide?

Two independent potential-free changeover relays (250 VAC / 5 A resistive load) support configurable high-level alarm, low-level alarm, pump start/stop, and alternating pump control for dual-pump stations. Alternating logic automatically swaps the duty and standby pumps on each cycle, equalizing runtime and preventing one pump from seizing due to prolonged inactivity. A configurable 0/4–20 mA analog output mirrors the measured level for connection to PLCs, SCADA systems, or Labkotec's LabkoNet remote monitoring platform.

How does the display support field operation?

The front panel combines a 2-row alphanumeric LCD for level readout and configuration menus with a 0–100% bar graph that updates in 5% increments — giving operators an instant visual reference of tank level without needing to read numeric values. LED indicators show relay status (energized/de-energized), supply voltage presence, and error conditions. Configuration is via four front-panel pushbuttons with menu navigation, including volume calculation for horizontal cylindrical tanks.