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OFT-8 FURNACE VIEWING TELEVISION SYSTEM

The OFT-8 system represents the current state of the art in furnace and boiler viewing television, incorporating water and air cooling within a very small overall diameter of only 35mm, and the provision of an automatic retraction system as standard.

As with all of our furnace viewing systems, the OFT-8 provides high-quality pictures by viewing the furnace interior directly with no windows to degrade the image or require cleaning. Cold clean air is passed over the optical surfaces of the system to keep them clean and provide secondary cooling; a water jacket provides primary cooling for operation at furnace temperatures up to 2000°C.

Because of the very arduous conditions at these temperatures, the system incorporates an automatic retraction system as standard to withdraw the assembly from the hot area in the event of any loss of cooling air, water, power, or in the event of temperature excursion outside defined limits.

The system is designed so that in the event of alarm activation it latches out and requires manual reinsertion into the hot zone; this ensures that the source of any alarm condition must be investigated, prohibiting the overriding of the system by the operator following a transient alarm. It is possible at specific user request to provide remote re-insertion, after the alarm condition has cleared, but we do not recommend this, as the cause of the alarm should always be investigated at the camera location.

The system is fail-safe and will still retract even in the event of total failure of all services.

High-efficiency filters are provided to allow operation from normal plant air, and it is possible to change these on-line without withdrawing the camera from the furnace, so the pictures are not lost to the operator, even momentarily.

High quality colour pictures are displayed to the operator on an industrial video monitor.

All hardware required for a complete operating system is included and no further items are required apart from water, air and electrical services, and cabling between the furnace and operator's location.

Specification:
Camera:	Colour solid-state unit with CCD sensor PAL/NTSC format as appropriate.
Lens:	Special optical system with field of view to suit application (maximum 100°).
Housing:	Stainless-steel double reverse flow design Length to suit furnace wall and refractory thickness, typically 800mm Diameter 35 mm Automatic retraction system in event of alarm activation withdraws assembly from hot zone for safety. Local isolation of auto-retract action is provided for safety of service personnel.
Junction Box:	Size 800mm (h) x 600mm (w) x 250mm (d) Houses all electrics, pneumatics and alarm relays.
Monitor:	(Standard) 36cm (14") picture tube metal-cased industrial unit Size 340mm (h) x 346mm (w) x 414mm (d) Weight 15Kg (Other sizes are available).
Services:	Water:	Minimum 5 litres/min with inlet temperature of 35° C or less Should be reasonably free of sediment.
	Air:	240 litres (8ft3)/min free air at inlet pressure of 4-7 bar (60-100 psig) Filters are supplied to ensure suitable air quality when fed from plant air supply.
Electrical:	Junction Box:	90-260V AC, 47-63Hz.
	Monitor:	100-240V 50-60Hz Approximately 95 watts.
Cabling:	A 75 ohm coaxial cable is required between junction box and monitor locations; alarms will depend on local requirements, but for full duplication at remote point a 9 core cable is required. There is no practical limit on the distance between camera and monitor, but if this is very large (above 400 metres) additional equipment is required to process and amplify the signal.

Due to our policy of continual product development, specification may change without notice.
All Industrial Television and Optics products are designed and built in Britain.

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