Dry air compressed into a copper cable will protect the copper from the potential ingress of moisture, improving reliability and clarity, and reducing long-term costs. This is especially important where widespread adoption of broadband services requires optimum cable performance. This pressure can provide an additional facility of allowing maintenance engineers to predict and locate potential faults by identifying holes in the cable sheathing. AIRMON exists to comprehensively provide you with these facilities.


The foremost feature of the system is its ability to produce alarms when air pressure falls below a selected threshold. Many different thresholds can be set:

  • High-pressure alarms
  • Low-pressure alarms
  • Trend-alarms

These alarms are divided into groups by type and area and can be routed to different alarm terminal PCs instantly or as a daily or weekly report. You can choose which engineers need what information, and which repair work you consider essential. Additionally, the system can be integrated with alarms from your compressor/ dehydrator units, to provide warning of:

  • Mains-Fail
  • High-humidity
  • High-pressure
  • Low-pressure

It is possible to prioritise work by graphing the condition of a cable over a period, which can be months or hours. This can show that a cable has deteriorated gradually over a period of months and, whilst it has reached your threshold for repair, it is likely to remain free from water for the next few days. More of a priority would be the cable that has read a constant pressure for months and then fell instantly to zero at a time, on a day. Further investigation using the AIRMON system might reveal the exact location of a local contractor who has just cut through one of your critical cables.


One of the most valuable features of the system is its ability to plot pressure against distance graphs. An automatic computerised version of the more antiquated ‘pressure runs’; the system constantly reads the pressure at intervals along your cables. At your request, a graph is produced which will illustrate these multiple readings, and ‘interpolation’ lines will help you to pinpoint the cable damage.


The system has many self-diagnostic facilities and will generate alarms when transducers become disconnected. Transducers are addressable and can, therefore, be connected in series along a single pair of wires, making installation simple and using little of your cable resources. AIRMON can provide reliable transmission over distances of up to 100km (60 miles.)


These are small and reliable, and allow a sensor to transmit analogue readings using a digital protocol. They are individually assigned with one of 100 different address settings. This “address” is set using a local hand held the device without the need for DIL switches. Transducers are available in pressure, temperature, and humidity variants, and are available for mounting within cabinets, exchanges, and on or in cable joints.