III.
Trouble shooting and Labels
3.1 Common faults & solution
3.1.1 Warning and reminder
Digital display of pressure difference, digital velocity display, audible and visual alarm system.
1) Over safety height alarm for front window
There will be audio and visual alarm when front window is lifting over safety height. Same time
LCD display will twinkle exclamation mark. Then just adjust the height of the front window.(Front
window height setting value is 200mm).
2) HEPA filter pressure difference alarm
There will be audio and visual alarm if pressure of air supply filter or exhaust filter can’t meet
present value, at the same time LCD display will twinkle exclamation mark. Remind the operator to
replace the filter immediately to protect the operator’s safety.
3) Velocity fluctuation alarm
There will be audio and visual alarm if the inflow velocity and down flow velocity below 20% of the
standard value, namely, inflow velocity below 0.42m/s, down flow velocity below 0.26m/s, at the
same time LCD display will twinkle exclamation mark to remind the operator pay attention.
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