08 TECHNICAL INFORMATION | PRODUCT-SPECIFIC SECTION
Capacity
Accuracy limits class AS suitable for official calibration DIN 12 700 ± ml
Accuracy limits class B
DIN 12 700 ± ml
DURAN ® ± ml
ml
1 2 5
0.01 0.01 0.01 0.02 0.03 0.05 0.08
– – –
– – –
10 25 50
0.05 0.05
0.03 0.04 0.08 0.15
0.1 0.2
100 1
1 Non-DIN size.
Pipettes
Measurement and bulb pipettes are made from soda-lime glass. Pipettes are for precise measurement and filling of liquids. Measurement pipettes are graduated to permit the taking up of varying liquid quantities and then dispensing of the same or different amounts. Bulb pipettes are designed to repeatedly take up and discharge a fixed volume for each pipette size. Calibration is based on the released volume (“Ex”) at a + 20 °C reference temperature. The fluid quantity released can be taken exactly from the scale, as the liquid adhesion to the glass is taken into account in the calibration. This only applies, however, if the specified waiting times for reading the scale are adhered to. Volume content tolerances for calibrated pipettes conform to DIN and ISO accuracy limits. DURAN® Class B pipettes’ accuracy limits are roughly one and a half times the Class AS accuracy limit. The tolerances are thus stricter than specified by DIN. By the specification of a class “AS”, the German weights and measures regulations have, within the scope of the 15 th Amendment Regulations, acknowledged that the great majority of volumetric measurements, especially in clinical laboratories, are carried out with water or dilute aqueous solutions; thus apparatus with considerably shorter draining times than previously required but with the same accuracy limits is now admitted by the calibration regulations.
Capacity
Accuracy limits class AS suitable for official calibration ISO 385 ± ml
Accuracy limits class B
ISO 385 ± ml
DURAN ® ± ml
ml
0.1 1 0.2 1
– – –
– –
0.01 0.01
0.5
0.01 0.01 0.02 0.05 0.10 0.20
0.008 0.008 0.015 0.040 0.080 0.150
1 2 5
0.007 0.010 0.030 0.050 0.100
10 25
1 Non-ISO size.
Recommendations • To ensure a long service life for your volumetric glassware and to exclude possible volume changes, these products should not be heated above + 180°C (soda-lime glass + 121 °C). • Never heat volumetric glassware on a hot plate. • Always heat up and cool down volumetric glassware gradually, to avoid thermal stresses and thus any possible breakage of the glass.
219
Powered by FlippingBook