- Point level detection in liquid tanks and bulk solids silos, also in hazardous areas
- For sensors in Zone 0 or Zone 20
- Liquid detection in pipes for dry-run protection of pumps
- Overfill prevention in tanks with flammable or non-flammable water-polluting liquids
- Two-point control and point level detection in one switching unit
- Application in safety systems with functional safety requirements up to SIL 2 in accordance in IEC 61508 when using the Liquiphant M/S with electronic insert FEL56 and FEL58 or Soliphant M with electronic insert FEM58
- Intrinsically safe signal circuits [Ex ia] for use of sensors in hazardous areas
- Compact housing for simple side-by-side installation on standard DIN rails in cabinet
- Easy connection with plug-in terminal blocks
- NAMUR interface according to IEC/EN 60947-5-6 for connecting NAMUR sensors
or electronic inserts
The intrinsically safe signal inputs of the Nivotester are galvanically isolated from the mains and the
The Nivotester supplies a DC current to the sensors or to sensors specified to IEC/EN 60947-5-6 via
a two-wire loop. Examples of the sensors include Liquiphant M/S with electronic insert FEL56 or
FEL58 and Soliphant M with electronic insert FEM58. At the same time, a control current is
transferred along this power supply line. The control current range: < 1.2 mA and > 2.1 mA
depending on the switching status.
The Nivotester measures the control current which is transferred along the sensor power supply line
and evaluates it. The relay for the level alarm switches when the sensor is covered or not covered. A
yellow LED on the front panel of the Nivotester signals the relay switching state. A red LED signals
faults, e.g. a short circuit or cable open circuit.
By selecting the correct fail-safe mode, you ensure that the relays always operate with quiescent
The error current signal of the connected sensor (< 1.2 mA and > 2.1 mA) can be set for each
channel with the DIL switches on the Nivotester. This means that the Nivotester can be used for any
application at the required level of operational safety. Combined with a sensor, quiescent current
safety is defined as follows:
MAX = maximum safety: the relay drops out when the switch point is exceeded (sensor is covered), a fault occurs or the power supply fails.
MIN = minimum safety: the relay drops out when the switch point is undershot (sensor is not covered), a fault occurs or the power supply fails.