VEGA D85 Hydrostatic pressure transmitter - Manual (Page 25)

Pressure transmitter D85 25
Setup
Adjustment
For adjustment of zero and span, an amme-
ter must be connected to terminals 1 and 3.
The measured value is identical to the output
current.
1 Adjustment of zero
(e.g. process pressure zero or empty ves-
sel)
• Set rotary switch to zero.
• By pushing the "+" and "–" keys simultane-
ously, the current jumps directly to 4 mA or
you can adjust a current of 4 mA with the
"+" and "–" keys.
Adjustment range of zero:
-20 % … +95 % of nominal measuring range
(corresponds to a turn up of up to +95 %)
2 Adjustment of span
(e.g. process pressure or level at maximum)
• Set rotary switch to span.
• By pushing the "+" and "–" keys simultane-
ously, the current jumps directly to 20 mA
or you can adjust a current of
20 mA with the "+" and "–" keys.
Adjustment range of span:
3.3 % … 120 % of nominal measuring range
(corresponds to a turn down 1 : 30)
Note:
- A modification of zero does not influence
the span, i.e. the measuring range final
value is simply shifted.
- It is also possible to adjust currents for
partial fillings or partial pressures, e.g.
8 mA for 25 % and 16 mA for 75 %.The
pressure transmitter then automatically
calculates the values for 0 % or 100 %
(only possible with a level difference
>3.3 %).
Integration time
An integration time t
i
of 0 … 10 s can be ad-
justed to damp pressure shocks.
Procedure
• Set rotary switch to t
i
.
• By pushing the "-" 10 times, make sure that
the integration time is set to 0 s.
• For each 1 s of requested integration time,
the "+" key has to be pushed once.
Bedieneinsatz operating unit
S Z t i Op
4 3 2 1 5
+ -
12V...36V DC 4...20mA