13
Flashlight and acoustic alarm
The flashing light and the acoustic signal generator are located in the protected area, with the exception of refrigerated areas
where the temperature is below 0 °C. If the flashing light and the acoustic signal generator cannot be placed in the protected
area, an equivalent alternative location will be determined. With the flashing light and the acoustic signal generator it is
possible to give a low and high level alarm.
•
The low level alarm (flashing light only) means that there is a fault in the installation, but that the deviation from
the set oxygen level remains small.
•
The high level alarm (flashing light and acoustic signal) means that the oxygen content is threatening to decrease
too much. The room should be evacuated.
The flashing light and acoustic signal are part of the LOX basic system and are not described separately in this manual.
Operation takes place via the LOX controller.
A second possibility is that the LOX system is connected to the fire alarm system or is part of a quick release system. In these
cases, the details are given in the relevant manual.
Emergency stop
The LOX system can be equipped with an emergency stop facility as an option. It is not a requirement for the LOX system to
have an emergency stop as stopping the system does not immediately create a safe situation in the protected area. In order
to create a safe situation, ventilation is required to increase the oxygen level to its normal value. If it is still desired, it is
possible to apply an emergency stop device to the system. This ensures that the whole LOX system can be stopped by
pressing the emergency stop button once. When the user does this, the following will happen:
•
The power supply to the LOX nitrogen generator is interrupted;
•
The power supply to the compressors for the LOX system is interrupted;
•
The LOX Control panels, Oxysensors, Color Displays and the nitrogen generator switch to the 'Uninterrupted Power
Supply' (UPS). These components are supplied with power by the UPS for 24 hours until the batteries are empty.
•
The compressed air supply to the nitrogen generator of the LOX system falls silent and eventually drops to 0 bar (g).
•
The LOX nitrogen generator will continue to function and will stop proportional to the compressors when the
compressed air pressure has dropped to 0 bar (g).
Humidity sensor
The humidity detection sensor has a humidity reservoir that contains
a humidity sensor. As soon as an unwanted amount of condensate
arises in the compressed air supply, the reservoir fills with moisture
and the moisture sensor detects this. The moisture sensor then
generates a visual signal in the form of a red LED and sends an
external signal via a potential-free contact. The LOX system responds
with an alarm signal. To prevent further damage from the moist
compressed air, the LOX system switches off the nitrogen generators.
When the formation of the condensate has been resolved, the
moisture detection sensor can be drained and the alarm signal can
then be reset.
The Moisture Detection Sensor is usually located in the filtration
section of the compressed air supply, in front of the nitrogen
generators. Every LOX installation has a filtration line which consists
of at least one super mist filter, odour filter or a multiple thereof. The
Moisture Detection Sensor is mounted under the super mist filter
whenever possible.
Figure 7. Humidity sensor
Summary of Contents for LOX
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