CCT Chamber - ACC42 Wall Wash - how it works
CCT Chamber - ACC42 Wall wash
This optional accessory comprises of a water spray rig to automatically wash the internal walls of the CCT chamber with water for a user adjustable number of minutes, at programmable points within a corrosion test cycle. This test is required for some automotive standards.
The control system fitted to Ascott CCT chambers enables the user to program whether wall wash is conducted alone, or in sequence with other climates, to form a cyclic corrosion test, for automatic execution by the chamber.
This option requires the chamber to be connected to a continuous pressurised water supply of a quality and temperature suitable for washing the chamber walls.
Water inlet valve
A electrical solenoid valve controls the flow of water to the water spray rig that washes the walls. This valve is controlled automatically, via the CCT chamber control system, to deliver water from the inlet, to the spray rig, at user programmable times.
Water spray rig
Located high up on the walls of the chamber is a spray rig which sprays water at the walls of the chamber from a number of strategically located spray nozzles. This water then runs down the walls to wash any salt that may have adhered to them, away to waste, via the chamber drain.
Forming the centre-piece of the ergonomically designed control panel is a state of the art, touch-screen, Human Machine Interface (HMI). It is here that the user controls and monitors the various chamber functions. The HMI incorporates alpha-numeric text messaging and digital displays of chamber variables such as temperature, humidity and time. Also included is a useful trend logging facility. This generates a graphical display of set values for temperature and humidity, over a 72 hour time period, and compares this to the actual temperature and humidity achieved inside the chamber, over the same period.
All chamber control panels incorporate an emergency stop and other safety facilities.
The chamber canopy is effortlessly opened/closed using pneumatic cylinders, which are activated at the touch of a button on the control panel. An automatic purge facility is incorporated to minimise the risk of corrosive salt spray escaping into the laboratory when the chamber is opened.
The climate created inside the CCT chamber during wall wash is uncontrolled in terms of temperature and humidity.
A floor level drain is required to remove used wall wash water from inside the chamber to waste.
If access to a floor level drain is not possible or inconvenient, Ascott offer an optional accessory (ref; ACC20) comprising of a waste water trough and pump, which locates on the floor behind the chamber. Condensate from the chamber drain outlet is directed into this. When the holding tank becomes full, the condensate will automatically be pumped out by a marine specification pump. This will discharge waste water to a remote drain or effluent tank located up to 10M/30ft away horizontally and up to 3M/10ft vertically. ACC20 is not suitable for chambers fitted with the SO2 gas dosing optional accessory (ref; ACC46) due to the possible existence of H2SO4 in the condensate.
Test samples are accommodated within the chamber generally by placing on, or by suspending beneath, sample racks. A full set of sample racks are provided as standard with each new chamber (see chamber data sheets for quantity) in a choice of styles. Additional sample racks are available as optional accessories, if required, as is a reinforced false floor (ref; ACC19) for supporting large/heavy test samples directly on the chambers internal base.
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