Installation Guide
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Thermal Imaging System
NIR-B Borescope
Electrical Auto Retract
These installation instructions cover specific details of the NIR-borescope Auto Retract
(AR) system – they are meant to be read in conjunction with the instructions for the
NIR borescope itself, and the user guide to the Image Pro NIR-b software.
1.1 System Description
The NIR-borescope Auto Retract (AR) system comprises a slide beam and camera
support onto which is mounted the NIR-borescope (NIR-b) in its cooling jacket.
When the NIR-b lens system is inserted into the hot process area, it requires air and
water cooling to keep its components within operational limits. If the cooling fails and
the lens system rises above its limit, damage to the lenses will occur.
The AR system will remove the NIR-B from the process if:
•
the power is lost (it has battery back up to do this)
•
any of the cooling services (air/water) to the lens system are lost. For PLC
firmware version 2.1 and above, the Auto Retract will operate when the water has
been off for over three minutes
•
the NIR-B lens system temperature reaches its alarm level
A Furnace Seal Assembly ensures that when the NIR-b is retracted from the process,
the process view port is sealed off with a Furnace Seal Assembly and purge air.
Water cooling first feeds through the rear of the water-cooled jacket to cool the
borescope electronics and then passes along the length of the jacket to cool the lens
section of the camera within the process.
The installer must ensure there can be no access to moving parts and that the system
meets local safety regulations.
A combination of faults (i.e. the water flow stops, and the AR system fails to retract),
could lead to a build-up of pressure within the water system and therefore the water
system is fitted with pressure relief valves (6bar).
The AR system has an Electronic Control Unit (ECU) which replaces the passive terminal
box of the standard installation. This contains the monitoring and control of the AR
system.
The systems back-up battery is mounted in a separate enclosure attached to the ECU.
This ensures that any gases escaping from the battery are distanced from the ECU’s
electronic components removing risk of explosion. Vents on the battery box allow the
gases to escape harmlessly into the atmosphere.
AUTO RETRACT
SYSTEM OVERVIEW
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