PRESSCON LOX, Руководство пользователя

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11
N
2
Control
The N2 Control monitors and controls the devices related to the production of nitrogen, such as the nitrogen generator and
the compressor. The N2 Control receives information from the Ox Control that determines whether nitrogen is needed in the
protected area. The N2 Control reacts to this signal by activating the nitrogen generator and the compressor. It also controls
the valves in the nitrogen supply lines, so that the nitrogen is blown into the right room. During nitrogen production, the N2
Control monitors whether production is proceeding as it should. For example, it measures the flow of compressed air to the
nitrogen generator (when used) and measures the nitrogen flow to the protected room. It also checks for errors in the related
devices such as the compressor, dryer, filters and humidity sensor by means of sensors and switches.
The N2 controller can control up to three nitrogen generators. If it is necessary to control several nitrogen generators, this is
done with additional N2 controllers.
Ox Control
The Ox Control monitors and controls the devices in and around the protected space that are related to the oxygen reduction
process. It receives its information from the Oxysensors located in the protected space. According to the measurements of
the Oxysensors, the Ox Control determines how much nitrogen is required to maintain the oxygen-reduced atmosphere. This
nitrogen demand is then communicated to the N2 Control. The Ox Control also uses the measurements from the Oxysensors
to monitor deviations. If the oxygen level becomes too high or too low, the Ox Control generates an error or alarm message
that is visible on the ECD display and indicated by a flashing light and/or a slow whoop. The Ox Control also checks the status
of the power supply. The Ox Controls installed as a leading or redundant controller are not different from each other and are
always constructed in the same way.
Oxygen sensors
Accurate monitoring of the oxygen concentration in the protected area is essential. On the one hand, the oxygen content
must not become too low because of accessibility for people. On the other hand, the oxygen content must not become too
high in order to ensure fire safety.
High-quality oxygen sensors are used to measure the oxygen content. The measuring principle is based on zirconium
elements that measure the oxygen content.
Depending on the size, shape of the room and the objects in the protected area, several oxygen sensors are used. The
measuring signal is sent to the Ox controller(s). There are always at least three sensors applied.
FX
P
re
vent
Number: 500
Serial: 12345678
VdS
FX Prevent
Oxygen sensor
Figure 3: Image of the oxygen sensor
The oxygen measurement is registered and interpreted by the Ox controller. If the oxygen percentage in the protected area
rises above the trigger level, additional nitrogen is blown in. The oxygen percentage is controlled within an adjustable
bandwidth.
If a single sensor shows a large deviation, this may indicate an abnormal oxygen content or a defect. This is immediately
indicated by an alarm message.
The oxygen sensors are part of the LOX installation and are therefore not described separately in this manual. Operation
takes place via the LOX controller.