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A cost-effective ambient air purge system that requires neither compressed air nor an additional power source to remove the fly ash build-up within the Inspecta pipe sets.
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A fully automatic purging system that is easily retrofitted to existing Inspecta installations.

The installation of this system will eliminate the requirement for routine manual purging of the pipe-sets and maintain the leak detection system at peak performance without manual intervention. Inspecta ASLD systems are installed in most of the ESKOM power stations. Using acoustic detection technology, these systems can detect tube leaks less than 2mm in diameter in the large boiler structure. However, as the coal used by ESKOM is very high in ash content, there is a considerable amount of fly ash remaining after combustion. This fly ash swirls inside the boiler and quickly blocks the ‘listening’ pipe-sets that contain the sensitive leak-detection microphones. Unless the systems are frequently manually or automatically cleaned their ability to detect the leaks early, is significantly degraded.

  • Complements the existing Inspecta ASLD system.
  • Easily retrofitted to existing Inspecta ASLD plant sensor network. The Binder connector fitted, is compatible with Inspecta HA-3 sensor. An option exists to fit power station specific connectors if required.
  • Significantly increases the effectiveness of the Inspecta ASLD system by automatically maintaining optimum performance levels.
  • Improved early leak detection means that boiler outage times can be significantly reduced.
  • Inspecta APS removes the routine maintenance human factor. It is automatic and does not require any human intervention to function.
  • The system is purpose-designed to work in the extreme environmental conditions of a power station boiler house.
  • As a complement to the Inspecta ASLD system, the Inspecta APS system cost can be recovered on the single early detection of a potentially damaging steam leak.
  • AI-driven adaptive performance*

*Future planned enhancement.


Purge cycle interval

60 to 480 minutes

Trim Pot adjustment. Default 60 minutes


Purge cycle period

15 to 60 seconds

Trim Pot adjustment. Default 30 seconds


Ambient operating temperature

0°C to 65°C

Ambient temperature should not exceed 60°C for

more than 15% of operating time


Storage temperature limits

-40°C to 70°C



Input voltage

24V nominal

Up to 12 Ohm cable loop resistance


Max input voltage


Limited by Inspecta HA-3 constraint


Min input voltage


Assumes a maximum 12 Ohm cable loop resistance between Inspecta APS unit and 24V power supply


Input current

250mA typical



Routine maintenance



Periodic maintenance

2 years or 20 000 purge cycles **

Whichever occurs first.

** Instrotech offers a fixed-price refurbishment option for this product