WIKA 821 Mode D'emploi page 17

5. Commissioning, operation
5.4 Adjusting the set pointers of contact model 851
The adjustment of the set points is achieved using the adjustment lock in the
Adjustment lock
(to adjust the set pointer, place the
adjustment key here, press it in and set
the required set point)
window with the aid of the adjustment key (included in delivery; found in standard
instruments on the side of the cable socket).
Instruments with switch contact model 821 or 830 E
Adjustment lock
(to adjust the set pointer, place the
adjustment key here, press it in and set
the required set point)
The set pointers for the limit switches are freely adjustable over the full scale
range. For reasons of switching accuracy, switching reliability and service life of
the mechanical measuring systems, the switch points should be between 10 %
and 90 % of the measuring span.
Instruments with switch contact model 851
The set pointers of the limit switches are freely adjustable between 10 % and 90 %
of the scale range; the distance between the two set pointers is approx. 10 % of
the scale range (corresponds to approx. 30 ∢°). With nominal size 160 measuring
instruments it has to be ensured that the adjusting arm is pushed down exclusively
in the area of the set pointer to be adjusted. Otherwise damage to the instrument
pointer or a misadjustment of the zero point cannot be excluded.
5.5 Commissioning
Pressure surges must be avoided at all costs, open the shut-off valves slowly.
Operating instructions pressure gauges with switch contact models 821, 851 or 830 E
Set pointer
Set pointer
Pressure compensating valve
Adjusting arm
Removable
adjustment key
Removable
adjustment key
EN
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