Ohaus MB45 MOISTURE ANALYZER Manual - Manual (Page 62)

60 MB45
10.4 Troubleshooting
Problem: Display remains dark after switching ON.
Probable causes: — No line voltage
—
Power cable not connected
— Power line fuse blown
— Instrument faulty
Problem: The measurement takes too long.
Probable cause: — You have selected an unsuitable switch-off criterion. Try experimentation to arrive
at a suitable switch-off criterion.
Problem: The instrument does not heat following the start up.
Probable cause: — The dryer is overheated and the thermal overload protection has responded. For
safe operation, the instrument is equipped with a duplicate overheating protection
device: The dryer unit has a thermal overload protection device which switches off
the heating element. Units containing an access hole allow the thermal overload
protection device to be reset manually. Refer to paragraph 10.3 for instructions.
On units that do not contain an access hole, contact your OHAUS dealer.
Problem: The measurements are not repeatable.
Probable causes: — The samples are not homogeneous, i.e. they have different compositions. The
more inhomogeneous a sample, the larger the amount of sample needed to
obtain a repeatable result.
— You have selected a drying time that is too short. Extend the drying time or select
a suitable switch-off criterion “Weight loss per unit of time”.
— The sample does not come completely dry (e.g. owing to skin formation). Dry the
sample on quartz sand.
— You have selected a temperature that is too high and the sample has oxidized.
Lower the drying temperature.
— The sample boils and the splashed drops continuously change the weight. Lower
the drying temperature.
— Insufficient heating power as the protective glass is dirty. Clean the protective
glass.
— The temperature sensor is contaminated or faulty. Clean the temperature sensor.
— The support on which the instrument is standing is not stable. Use a stable
support.
— The surroundings are very unstable (vibrations etc.).