MBA Instruments MLA 900, Operating Instructions Manual

Page: 21 / 40

Handling
MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 21
4.3
Performance test
Check condition of instrument
1
Make sure that
– the cylinder of the measuring probe is tightly screwed on
– the measuring probe is sufficiently clean and dry
– display unit and measuring probe are correctly connected to each other (inspect
cables and plug connectors).
Check basic condition
2
Open the cover flap of the display unit in order to switch on the MLA 900. Let the
measuring probe hang free in the air.
➝
The conductivity value measured should then read
-2
…
2
pS/m.
b
If a value above
2
pS/m is displayed: carefully clean the measuring probe (
→
S. 27,
§5.1 ).
b
If a value below
-2
pS/m is displayed: check the battery (
→
S. 29, §5.2 ).
Check measuring function
3
Hold the surface of the measuring probe with the company logo close to the red disc on
the display unit.
➝
The MLA 900 should display
1000
pS/m (±10 pS/m).
b
If the value is not between
990
and
1010
pS/m: check the battery (
→
S. 29, §5.2 ).
VORSICHT: Risk of wrong measurements
b
Always make a performance test before operating the MLA 900.
b
Perform this performance test outside hazardous locations.
A re-calibration (a new adaptation of measuring probe and electronics) is
usually not required. If it is however necessary, this work must be made at the
manufacturer's factory, for safety reasons. Please observe the transport
instructions before shipping the instrument (
→
S. 31, §6 ).