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5.5
Menu level Switch points
The two switch outputs are configured by four pa-
rameters respectively.
For switch point 1 these are:
SP1 On
,
SP1 Off,SP1
Delay
,
SP1 Function
.
For switch point 2 accordingly:
SP2 On
,
SP2
Off,SP2 Delay
,
SP2 Function
.
SP1 On
specifies the activation point,
SP1 Off
the
deactivation point of switch output 1. The values are
displayed and set in the valid unit.
Together, the two parameters determine the switch
function of switch output 1:
If
SP1 Off
<
SP1 On
, the output switches on, if the
measured value exceeds
SP1On
. It is only
switched off again if the measured value
SP1 Off
is
undercut (hysteresis function).
If
SP1 On
=
SP1 Off
, the output switches on if the
measured value exceeds
SP1 On
and off if the
measured value undercuts
SP1Off
.
If
SP1 Off
>
SP1 ON
, the output switches on, if
SP1
On
< Measured value <
SP1 Off
applies (window
function).
Both parameters can be set independently over the
entire range.
SP1 Delay
allows the reaction of the switch output
1 to be delayed by between 0 and 100 s. This value
applies equally for switching on and off.
The following applies for instruments
with firmware 2.16 and later:
The reaction of the switch output is delayed by
0…1800 s.
SP1 Function
changes the function of the switch
output. It is possible here to define whether the con-
tact should work as an open contact (NO) or a
break contact (NC).
5.6
Menu level Input
If there are unsteady pressure readings during op-
eration, you can use the parameters
Damping
and
Zero-point window
to stabilise the reading (and
the output signal).
The effect of parameter
Damping
(on the reading,
output signal and switching points, if available, but
not on the measuring cell!) corresponds to that of a
capillary throttle. You can set the response time to
pressure jumps in the range 0.0 to 100 s. But with
maximum damping, it will take more than 2 minutes
for the reading to also reach zero after a pressure
jump from nominal pressure (100 %) to zero!
In many cases, unsteady readings are not a prob-
lem during normal operating mode, but this is not
true for the idle state, i.e. if zero (differential) pres-
sure is expected. In such situations, the parameter
Zero-point window
can be applied. Its value de-
fines a range of measurement values around zero,
for which the measuring value is set to zero. The
reading will not indicate zero any more, only if the
pressure exceeds these limits. When reaching dou-
ble the value, the measuring pressure and reading
match again. This avoids jumps in the reading.
It makes sense to set the
Offset
(zero-point dis-
placement) if, without differential pressure (remove
measuring line), the display shows a value that is
not zero. Before the offset correction, the zero-point
window should be set to zero.
Select the
Offset correction
parameter and correct
the reading using the buttons
þ
and
ÿ
until zero is
shown.
The following applies for instruments
with firmware V2.15 and later:
The currently measured value is shown when set-
ting the offset. The zero point window is not active
when the offset is being set.
5.7
Measurement
The transmitter output signal initially depends on
the sensed pressure. However, you have the option
of adjusting the output signal to a large extent to
suit your requirements.
The basic measuring range (indicated on the type
label) and the type of output signal (voltage / cur-
rent see type label) are not variable.
The parameters
Start of measuring range
and
End of measuring range
initially define the two
pressures between which the output signal will
change at all. Both values are adjustable across the
entire basic measuring range. The set values also
