NORMALAB NDI 450 - Page 94

NORMALAB France
2012
N O R M A L A B F r a n c e
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start or takes a
long time to start
of compartment or
condenser temperature
power supplies are correctly positioned.
Verify that the switch for each internal
power supply is at ‘on’.
Verify that the fan filters are not clogged by
dust.
Verify that the temperature exchanges of
the compartment or condenser sub-
assemblies are not clogged by dust.
Verify that the fans can rotate freely.
Verify the ambient temperature in the
laboratory and of the instrument (proximity
to an instrument emitting hot air).
Verify the level of liquid in the expansion
chamber of the condenser circuit.
Verify that the condenser circuit circulation
pump is operating.
The heating element of
the heating block does
not heat up, or heats up
only slightly
Verify the heating circuit fuse.
Verify the heating thresholds in the product
file.
Verify the calibration of the heating block
thermocouple.
Flow rate
incorrect or
unstable
Poor regulation of flow
rate
Check that the drip deflector is correctly
positioned (it must touch the glass wall on
the front).
Place glass balls or pumice stone in the flask
to attenuate disturbance during boiling.
Verify the values in the product file.
Verify that the sample does not swell up
because of a not adapted product file or
presence of water in the sample.
Verify that the instrument is stable and