- Level monitoring of hydrocarbon liquids in oil-water separators.

The RAC 531 A monitoring system is used for oil/light liquid separators. It is used to monitor the level of the accumulating oil/light liquid layer.

An oil probe of type NivOil OP (BVS 07 ATEX E 091 X) is connected to the RAC 531 A control unit. The probe detects the layer of oil/light liquid floating on the water.

The device signals the respective alarm new/old and OK status with three LEDs and has built-in cable break and short-circuit monitoring.
RAC 531 A has a built-in horn. Thebuzzer can be disabled by the user.

Sensor power supply RAC 531 A

Operating voltage		230V AC 50...60Hz
Safety-related
maximum voltage		Um = 250V AC
Power consumption		2W / 2.5VA
Wall-mounted housing		120x80x55mm
Protection class		IP65
Ambient temperature		-20 ... +60 °C
EU type examination certificate		BVS 12 ATEX E 019
ATEX signal circuit limits		The maximum permissible values (U₀, I₀, P₀ and C₀, L₀) of the intrinsically safe measuring circuits were taken from the type examination certificate/type plate for each channel and in conjunction with the NivOil probes.
Ex protection class		II (1)G [Ex ia Ga] IIB/IIA (associated electrical equipment)
Probe input		1 input, only for oil probe NivOil OP (BVS 07 ATEX E 091 X)
Monitoring		The probe is monitored for cable breaks and short circuits
Display and signals<		Green LED -> Device in operation, no alarm Yellow LED -> alarm not acknowledged Red LED -> ongoing alarm still active
Operating		1 button for alarm acknowledgement and test
Relay output		1 relay output, 230V AC, 3A, potential-free changeover contact

CE mark: The device fulfils the legal requirements of the applicable
EU-guidelines