Function ´Zero Point Adjustment´
using the key::
<
ADJ
>
Meas.Val:
00:
°C
!
00.0
Zero Point:
ZeroPoint: 23.4°C
If a base value has been programmed, the measured value indi-
cated after adjustment is not zero but the negative base value.
In the case of dynamic pressure probes the zero-point error is writ-
ten temporarily (i.e. until you switch off) to the calibration offset -
even if the channel is locked.
In the case of
the following sensors,
if the calibration value is applied, the
same key
automatically makes a
gain adjustment
:
pH probe
ZA 9610-AKYx : 4.00 pH or 10.00 pH
Conductivity : FY A641-LF :
2.77 mS/cm,
FY A641-LF2 :
147 uS/cm
FY A641-LF3:
111.8 mS/cm,
O
2
saturation : FY A640-O2:
101 %
Gain adjustment
by means of key :
<
ADJ
>
Measured value :
00:
pH
!
10.00
Gain :
Gain : 0.1689
In the case of pH probes, by pressing the <ZERO> key, you can re-
store the standard values, base value 7.00 and gain -0.1689.
6.3.3 Setpoint Entry
For the correction of sensor errors the zero point adjustment has already been
introduced in section 6.3.1. For a two-point adjustment it is further necessary to
correct the slope (gain) by performing a comparison with a second measuring
point. With the function ´Setpoint Entry´ the correction factor is automatically
determined and stored as factor in the sensor connector.
1. Set sensor to the ´
zero state
´
(ice water, unpressurized etc.),
Set the meas. value to zero by using the keys (s. 6.3.1).
<
ZERO
>
or
<
ADJ
>
2. Put sensor to a defined
setpoint
(boiling water, known weight etc.),
Enter
the
setpoint
in function ´Setpoint´:
SetPoint:
°C
100.0
3.
Calibrate the measured value in function ´Setpoint´:
<
ADJ
>
Afterwards, the measured value, as well, should indicate the set point.
In this case, as well, the locking level must be set below 5 to allow a
programming of the factor (see 9.4).
ALMEMO
®
2590-9
27
Displaying a Measuring Point
