Mettler Toledo MX5 Mode D'emploi page 6

�i����a�an�e ���te� �et ��� ���te�� ��� t� �� 70��
6
4 Measuring methods for filter weighing
The�e a�e tw� �ain �eth�d� ��ed ��� ���te� weighing, a� de���i�ed �e��w.
Important: Before weighing, all filters must be sufficiently acclimatized in the measuring room!
4.1 Simple method
B
1
4.2 Method with reference filter
A
1
A
2
3
8
9
A
A
10
B
5
3
B
2
B
4
B
5
B
11
B
12
4
6
7
With the �i����e �eth�d, �n�y �ne test
filter (B) i� ��ed.
Fi��t, the new and �n��nta�inated ���te� i�
weighed (�te�� 1) and then ex����ed t� the
�����e �� ��nta�inati�n (�te��� 2 – 4).
Then, the ��nta�inated ���te� i� �eweighed
(�te�� 5).
By �����a�ing the tw� weighing �e���t�, the
��nta�inati�n �an �e �a����ated.
Thi� �eth�d a��� a���w� ��� �hange� in
a��ient ��nditi�n� and the ���tentia�
��nta�inati�n �� the �ea���ing ����.
Tw� ���te�� a�e ��ed ��� thi�, a reference
filter (A) and a test filter (B).
The new �e�e�en�e ���te� and the te�t ���te�
a�e weighed and the "D1" di��e�en�e i�
�a����ated. The �e�e�en�e ���te� (A) i� then
�t��ed in a ���te� �a�e in the �ea���ing
���� (�te��� 1 – 5).
The test filter (B) i� ex����ed t� the
��nta�inati�n (�te��� 6 – 7).
At the end �� the ��nta�inati�n ��e�i�d, the
�e�e�en�e ���te� (�te��� 8 – 10) and the te�t
���te� (�te��� 11 – 12) a�e �eweighed and
the "D2" di��e�en�e i� �a����ated.
The effective contamination " D""�an �e
�a����ated �y ���t�a�ti�n:
D = D2 – D1.
Note: T he di��e�en�e va��e� " D1" and " D2"
a�e ea�ie� t� �a����ate i� the �e�e�en�e
���te� i� a��eady ��aded and the �a�an�e
a��eady ta�ed. Then the �e�e�en�e ���te� i�
�e��ved and the te�t ���te� i� ��aded. The
�a�an�e n�w di����ay� the di��e�en�e in
weight �etween the tw� ���te��.