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Novasina provides filters for the protection of the measuring sensor against
alcohol, aromes, acids, base, etc. Please read our special information sheet
or contact your local Novasina dealer.
9.5.1. General rule for protection
Chemical filters have to be used if the admissible workplace concentrations
(MAK-values) are exceeded.
Some examples :
sulphur dioxide 2 ppm
formaldehyde 2 ppm
hydrogen sulfide 3 ppm
ethanol 300 ppm
Novasina provides the following protection filters for the LabSwift-aw :
• eVC-21 filter :
Chemical filter : protects against hydrogen peroxide, acid gases, diluted
acetic and formic acid, sulfur dioxide, chlorine.
• eVC-26 filter :
Chemical filter : protects against a multitude or aggressive substances,
e.g. nitrogen oxides, amines, aldehyde solvents, aromatic hydrocarbons,
oil vapours, fine dust particles.
• eVALC-1 alcohol filter :
Chemical - mechanical filter : protects against fine dust or alcohol.
9.5.2. Filter replacement
Chemical filters must be periodically replaced. Saturated filters falsify the
measuring results and the protective effect of chemical filters also deteriora-
tes.
No generally valid guidelines can be given concerning the filter service
intervals as this mainly depends on the concentration of harmful substances
and the operating temperature.
Replace a new filter carefully into the depression in the measuring head. Do
not bend or break the filter. A tension ring helps to fix the filter at the adequate
position.
Attention !
Defective or wrong mounted filters do not fullfil their function and endanger the
measuring sensor or instrument. Such a filter must be replaced immediately.
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