Burkert Type 8750 - Manual (Page 20)

I
NSTALLATION
18 - 8750
CAL P1’P2
P1 xxxx
P2 xxxx Balancing the pressure transmitter
The pressure transmitters p1 and p2 may be
calibrated to increase the measuring precision at
small pressure differences.
For this purpose the conveying pipe behind the
process valve (FMR) must be closed off and the
controller unit pressurized with a constant pressure.
Calibration of the zero point:
pressure < 10 % of the sensor range,
Calibration of the upper calibration value:
pressure > 55 % of the sensor range.
Changeover of dislay between p1 / p2 with
.
By pressing the key the value shown is
confirmed and the other value made equal to it.
NOTE: if the pressure is between 10 % and
55 % or a deviation of p1 from p2 of> 1.5 %exists,
the procedure is aborted and the message
P1P2 ERR displayed.
CAL TEMP
TEMP 4 MA
TEMP 20 MA
(see CAL P1 / CAL P2)
CAL TLIM
T MIN xxxx
T MAX xxxx
(see CAL PLIM)
CAL FACT
Hold depressed
key on display
of
FACT 5, 4, 3, 2, 1.
Reset the settings made under CAL.USER to the
factory settings.
ADDFUNCT
CHARACT
up to
ENDFUNCT
Main menu item for selection of supplementary
functions
Recommendation: please jump over at first this
menu item with key
for checking the factory
settings and for execution of first commissioning.
Program points already transferred from
ADDFUNCT to the main menu are prefixed with a *.
X.TUNE
Hold depressed
key on display
of TUNE 5, 4, 3, 2,
1; there follow the
displays
X.T A I—P;
X.T TCLS and
TUNE-END or
X.ERR 1 ... 7
Execution of AUTOTUNE for determining the
parameters for the positioner; during execution of
X:TUNE, the currently running worksteps are
displayed;
The before X.T symbolizes a rotating bar and
shows that the program is running;
after completion, the display shows TUNE-END; in
case of error, X.ERR X (X = 1 ... 7) is shown (see
errors / malfunctions)
P.Q'LIN
Hold depressed
key for at least
5 s until the
countdown runs
At first, please jump over with ! P.Q'LIN serves
to improve the control quality if the control behaviour
after PROCESSTUNE is insufficient (see also
Operating Instructions 8630)
Further to END I.00