531 M1 02 A
16-07-2010
2
Safety Precautions
Fitting, wiring, initial start-up and maintenance operations must be done by trained technicians.
All European and local rules for electrical instruments must be respected.
The device may only be connected to intrinsically safe measuring circuits which comply with the specifications
included in the technical data and on the serial plate.
The device must be disconnected from all sources of power during installation and maintenance work.
The device may only be operated under the conditions specified in the operating instructions.
Respect all recommendations, for installation and mounting of Ex devices, from standards EN60079-14 and
EN600079 CENELEC.
The device should not be modified or completed with anything.
All cables to connect the sensor must be out of any place where electrostatic risk exists.
1 DESCRIPTION
Designed for the monitoring of hydrocarbon fluids separators, the alarm device
NivOil
may
be connected to 1, 2, or 3 sensors.
Hydrocarbon fluid layer thickness sensor
to detect when the maximum thickness is reached.
Overfill sensor
to detect when the fluids are on the highest level; this can occur in case of
dysfunction of a filter, when a float-valve closes to prevent an overfilling, when the level of fluid
is too high.
Sludge layer sensor
to alarm when maintenance is necessary.
Detection of sludge maximal level, as soon as the sludge reaches the sensor, the alarm is
switched ON.
The 3 sensors may be connected to any input of the alarm device NivOil
Any combination of the sensors can be wired. The instrument recognizes automatically the sensor
type. A LED indicates the sensor type on the diagram on the front board. When an input is not
wired, the LED is off. The alarm unit NivOil has a built-in buzzer; it is possible to disable its function
by a DIP switch configuration.The alarm unit NivOil CU/12 works with a 10 to 27 V DC power
supply has a low energy consumption. It is de-signed for the use of a solar powered battery or
any standard electric battery
(consumption is 0.1 W – 12 V DC – with 3 sensors connected with
one complete control cycle per hour)
.The sleep mode allows optimal energy consumption. It is
adjustable by modifying the frequency of control cycle
(from 6 minutes up to 9 days)
. A continuous
control mode could be switched on when there is no limit on consumption. All the components
are ATEX certified. The sensors are for a location in zone 0 and the alarm unit corresponds to a
zone 2.
Important: It is necessary to follow the specific technical information corresponding to the mounting,
fitting and starting up of the devices.
