BARCON LHC/PPC
Operation of devices without displays
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
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This produces the calculated current (value I
calc
), which is entered in the transmitter
and used to program the span end-point (100 %).
The measurement range between zero point and span end-point will be stored as
span.
Example:
A pressure transducer with 0 mbar ... 400 mbar (nominal pressure) is to be
programmed. The liquid’s surface (with a density of 1) is 1 m above the diaphragm at
the zero point. The maximum (span end-point) should be 3 m. The measurement
range (span) is 200 mbar.
This means that the output must be set to 12 mA during programming.
A change in the zero point has no effect on the adjusted span.
However, if the span end-point is higher than the peak value of the
sensor’s nominal pressure range, then the span end-point is fixed at
this peak value and the span is reduced accordingly.
A change in the span setting has no effect on the zero point. The zero
point and span end-point must fall within the sensor’s nominal pressure
range.
A test/correction of the zero point is suggested after adjusting the span
in order to maintain optimum accuracy.
A mounting correction should be performed before or after making an
adjustment without pressure (dry adjustment) (see section 7.4.3). The
sensor must therefore be placed in the reference position for the
measurement (installation site) without pressure on the diaphragm.
I
cal c
pressure difference (span) (300 mbar - 100 mbar)
sensors nominal pressure 400 mbar
-------------------------------------------------------------------------------------------------------------------------------------------
16 mA
4 mA
+
⋅
12 mA
=
=
Enter
Value
Access
Function
... to Imeas = Icalc
Activate
Keypad
(2 sec.)
Calculate
Calibration Value
Calibration of span, without display, without pressure
current value decreases
Confirm
Calibration Value
... to Imeas = Icalc
current value increases
Icalc =
(2 sec.)
(2 sec.)
Important
Important
