25
Calibration of the zero and span
Con
fi
guration menu A “CALIBRATE” gives the
possibility to calibrate zero and span of the
transmitter LRV and URV).
The ranging of the transmitter needs to be
done in the “RANGE” menu 6. Please use
menu A “CALIBRATE” only when the LRV
and URV are
fi
xed in the “RANGE” menu. It
is absolutely necessary to apply an accurate
reference pressure corresponding to the zero
or LRV point as well as the span or URV point
when making a calibration.
Adjustment of the Low Range Value (LRV) : In
the CALIBRATE menu you push key LRV to
adjust the zero point corresponding to analog
output 4 mA.
Reference pressure is applied on the trans-
mitter, and you enter the corresponding value
through the key pad on HHC.
Please con
fi
rm the value by applying in key
“ENTER”.
Adjustment of the Low Range value (URV):
In the CALIBRATE menu you push key URV
to adjust the span point corresponding to the
analog output 20 mA. Reference pressure is
applied on the transmitter corresponding to
the span, and you enter the corresponding
value through the key pad on FXW.
Please con
fi
rm the value by applying in key
“ENTER”.
a) The calibration (LRV & URV) require a pressure generator with an
better accuracy than the transmitter. If the customer do not have this
kind of pressure generator, he should not use this menu but only the
“RANGE” menu to make a ranging of the transmitter without applying
a reference pressure. The “RANGE” menu will always keep the factory
calibration done with very accurate pressure equipment.
b) The menu “CALIBRATE” has always to be used when the transmitter
has been previously adjusted in “RANGE” menu.
c) On transmitters with local indicator option : the modi
fi
cation of the Zero/
Span in “RANGE” and “CALIBRATE” menu will not modify automati-
cally the con
fi
guration of the LCD indicator. A new adjustment of the
LCD indicator for the zero and span indication has to be performed.
Indicator with 0 to 100% indication don’t need to be changed.
INC
A:
CALIBRATE
< INC > < LRV >
1
CL
ENT
2
A-1:
CALIBRATE
LRV
sss
.
ss
%
CHNG OK? < ENT/CL >
3
A-2:
CALIBRATING
LRV
sss
.
ss
%
4
A-1:
CALIBRATE
LRV
sss
.
ss
%
< ENT > < CL >
ENT
sss
.
s
kPa
sss
.
s
kPa
sss
.
s
kPa
5
A-3:
CALIBRATE
URV
sss
.
ss
%
CHNG OK? < ENT/CL >
6
A-4:
CALIBRATING
URV
sss
.
ss
%
7
A-3:
CALIBRATE
URV
sss
.
ss
%
< ENT > < CL >
sss
.
s
kPa
sss
.
s
kPa
sss
.
s
kPa
LRV
CL
CL
ENT
CL
ENT
URV
< URV >
< Zero adjustment >
< Span adjustment >
B : OUTPUT ADJ
PRECAUTION