User manual

9
4.1. Comparator WPY/KB – preparation for work
Comparators of WPY/KB series, because of its construction (sensitive strain
gauges), require appropriate conditions to work properly, including stable
temperature. Temperature drifts in rooms with comparators should not
exceed 1°C per hour.
Proceeding in case of preparing the comparator to work:
1. After unpacking and taking off transport protections put the scale
in the destination place and level the komparator platform.
2. The room temperature must be stable – maximum allowable
temperature change is 1°C / h – and protected from accidental draughts
air flows e.g. from air conditioning directed on the comparator pan.
3. Then switch on the device and leave unloaded and on for 4 hours. This
is warming time during which electronical and mechanical parts reach
stable temperature conditions.
4. After 4 hours in stable ambient conditions the comparator can be
prepared for adjustment.
5. First load the comparator pan to the maximum capacity 1000kg and
keep this state at least 2.5 minuty (150 seconds).
6. Secondly unload the pan and wait at least 2 minuts (120 seconds),
to allow the scale to return to the minimum stable value close to „zero”.
7. The operation of initial loading should be repeated 5 times, every time
in reference to time intervals given above.
8. After the 5-time initial loading the comparator can undergo the
adjustement procedure: 2 minutes after unloading the pan and start
the adjustment procedure from factory menu – first start mass is
determined then load the calibration weight following hints that appear
on the display. Confirm the stable result after 2 minutes. This way the
adjustement procedure will be completed.
9. The comparator is ready for work.
Notice:
If working conditions are changed (temperature change greater than 1°C,
humidity change, sudden long lasting air flow causing a change of ambient
conditions) the adjucement procedure described above needs to be repeated.