Ce Marking; Functions And Limitations Of Use; Operating Exclusions - BRAND PLT unit Mode D'emploi

The BRAND leak testing instrument is a differential
pressure measuring instrument for determining the
leak rate of an air-displacement pipette. Static and
dynamic testing permit the localization of leaks.
Dynamic testing is preferable.
Testing is possible both with tips (for testing the
instrument/tip interface and the entire system)
and without tips (for testing the instrument). The
leak rate is directly related to the volume loss of a
pipette.
The leak rate Q is a measure of the quantity of
L
material (mass) that flows through a leak per unit
time.
Note:
The leak tester cannot substitute for gravimetric
testing for the monitoring of measuring instru-
ments. The instrument should be used to check
pipettes on a daily basis as a safeguard for the
periods between calibrations.
Limitations of Use
The instrument offers a rapid and simple test of
leakage in air-displacement pipettes within the fol-
lowing limitations:
– Operating temperature15 °C to 35 °C
– Rel. Humidity max 80%
– For use at elevations up to 2000 m above
sea level
– Storage temperature 0 °C to 50 °C
Important!
When the instrument is relocated to a new environ-
ment or even during transport, significant changes
in the temperature and atmospheric humidity can
affect the measurements.
To avoid error messages, the PLT unit must be
allowed to acclimate in the testing laboratory for a
period of 2 hours before use!
Function and Limitations of use
The leak rate is the ratio of the pV value of a gas
and the period of time during which the gas flows
through the leak. The pV value is the product of
the pressure and the volume of a certain quantity
of a gas at the prevailing temperature. In ideal
gases, the pV value at a given temperature is a
measure of the quantity of material or the mass
of the gas. The leak rate depends on the type of
gas, absolute pressure, pressure difference, and
temperature.
For the pipette test, hPa ml/s is a suitable unit for
the leak rate Q
air pressure of 1000 hPa means a volume loss of
1 μl/s.

CE Marking

This sign certifies that the product meets the
requirements of the EEC directive and has been
tested according the specified test methods.

Operating Exclusions

Users themselves must check the suitability of the
instrument for the intended application.
Do not use the instrument to aspirate liquids!
Avoid aggressive vapors (corrosion hazard)! Further
information available upon request.
Hollow vessels that are not specified for vacuum
use should never be evacuated, since the vessel
can burst!
AC adapter Specifications
PLT unit:
Input: DC 6.5 V= 800 mA
AC adapter:
Input: AC 100 V - 240 V, 50/60 Hz, 0,5 A
Output: DC 6,5 V= 800 mA
Protection class: IP20
. A leak rate of 1 hPa ml/s at an
L
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