BUSCH SIMPLEX, Руководство по эксплуатации

Страница: 20 / 46

7 | Start ‐ up
20 / 46
0870169324
_VD 0025 ‐ 0100G_ ‐ 0006_IM_en
7.1.4 Setting the target value needle on the contact vacuum gauge
The target values are set via the adjustment lock in the sight disc using the adjustment key
(enclosed, can be found on the side of the cable socket). To adjust the set pointer, place the
adjustment key at the adjustment lock, press it in and set the required set point.
Fig. 10: Contact vacuum gauge
The set pointers of the limit switches can be adjusted freely throughout the scale range. For
reasons of switching accuracy, switching safety and service life of the mechanical measuring
systems, the switching points should be between 10 % and 90 % of the measuring range.
Set the set pointers to desired activation and shutdown pressures. The clearance between the
two set pointers is approx. 10% of the scale range.
When the lower switching point is reached, the vacuum pump is switched off and correspond ‐
ing, when the upper switching point is reached, again switched on.
Factory settings of the switching points:

lower switching point: ‐ 0.9 bar (90 %)

upper switching point: ‐ 0.8 bar (80 %)
NOTICE
The recommended minimum clearance between two contacts is 10% of the measuring span.
The switch hysteresis is 2 … 5%.
Set pointers
Removable
adjustment key
Adjustment lock