10. Measuring using Measuring-Menus
30
10.2.2
Zero Point Adjustment
Many sensors must be adjusted at least once or at regular intervals to compen-
sate for instabilities. For this purpose, a specific
zero point adjustment
is avail-
able, in addition to the ´Set Meas. Value to Zero´ mentioned above, for not in-
fluencing the scaling. In this function the zero point error is not stored as base
but as
zero point correction
(s. 11.3.7).
Select function
Measuring Value
:
00:
01.2
°C
Function
Zero Point Adjustment
using the key:
<ADJ>
Carry out with key:
PROG
Meas. Value:
00:
00.0
°C º
Zero Point:
Zero Point: 01.2°C
If the function is locked more than 3 (s. 11.3.4),
a help box announces that the function can only
be unlocked momentarily for adjustment, for a
permanent storage of the correction values in
the connector.
Unlock momentarily for adjustment with key:
<FREE>
If a base value has been programmed, the measured value indicated
after adjustment is not zero but the negative base value.
In the case of
dynamic pressure probes
the zero-point error is al-
ways written temporarily (i.e. until you switch off) to the calibration off-
set - even if the channel is locked.
10.2.3
Sensor Adjustment in the case of chemical
sensors
In the case of the following sensors, with
<ADJ>
(s. 10.2.2), you get automati-
cally from the function measured value to the assistant menu
Sensor adjust-
ment
, for a
two-point adjustment
of
zero point
and
slope
. The corresponding
callibration value setpoints are already entered, but can also be changed:
Probe:
Type:
Zero Point Slope
pH probe:
ZA 9610-AKY: 7.00
4.00
10.00
pH
or
pH
Conductivity:
FY A641-LF:
0.0
2.77 mS/cm
FY A641-LF2:
0.0
147.0 uS/cm
FY A641-LF3:
0.0
111.8 mS/cm
O
2
saturation:
FY A640-O2:
0
101 %
If required, temperature and air pressure can
also be entered here for compensation.
Sensor ist locked
-Zero setting temporarily
press key: PROG
-To cancel press key: ESC
SENSOR ADJUSTMENT
±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±±
Select measuring channel:
01: 7.23 pH pH-Value
Temp.Compensation:
25.0 °C
Air pressure
1013. mb
Zero point:
Setpoint 1:
7.00 pH
01: 7.00 pH pH-Value
Slope:
Setpoint 2:
10.00 pH
01: 10.00 pH pH-Value
Slope error:
-10.8 %
START MANU M PRINT ESC
