Sensor Adjustment For Dynamic Pressure Probes; Sensor Adjustment For Chemical Sensors And Probes - Ahlborn ALMEMO 2590-2 Operating Instructions Manual

10. Measuring menus

10.2.2 Sensor adjustment for dynamic pressure probes

Dynamic pressure probes FDA602Sx must
undergo zero-point adjustment before each
measuring operation by withdrawing the hoses.
The zero-point error is always written to the cal-
ibration offset temporarily, i.e. until the device is
next switched off, irrespective of locking level -
thus ensuring that linearization is not falsified.
To select the measured value function press key(s) :
To perform zero-point adjustment press key(s) :

10.2.3 Sensor adjustment for chemical sensors and probes

The following chemical sensors need to be ad-
justed at least once or at regular intervals to
compensate for various instabilities. In the
measured value function pressing key
can be used to automatically perform a two-
point adjustment of the zero-point and the
gain. As and when adjustment is performed
the appropriate calibration setpoints appear;
these can also be modified as required :
Probe Type
pH probe
ZA 9610-AKY:
Conductivity FY A641-LF:
FY A641-LF2:
FY A641-LF3:
O saturation
FY A640-O2:
2
O probe
FY A600-O2:
2
Two-point adjustment
1. To select the measured value function press key(s) :
2. Setting up a means of calibration for the zero point.
Measured value shows e.g.:
To initiate zero-point adjustment press key(s) :
Context-sensitive help window
with setpoint appears.
To perform zero-point adjustment press key(s)
Measured value shows :

In the case of pH probes you can by pressing
default values, namely base value 7.00 and gain -0.1689.
24 ALMEMO
Zero point
7.00
0.0
0.0
0.0
0
-
® 2590
13:
L840 flow
Temp comp
Atm pressure
03: 1.67 Pa
ADJ
PROG
<ADJ>
10:
D2.6 pH value
<ADJ>
Temp comp
Gain error :
ADJ
Gain
4.00 pH or 10.00 pH
2.77mS/cm
147.0uS/cm
111.8mS/cm
101 %
20.9 % in fresh air
Sensor ad justment to
Setpoint
m/s
0.45
º
25.0 °C
1013 mbar
dyn pressure
ESC F
... (see 8.4).
pH
7.45
17.5 °C
-10.8 %
ESC F CLR
PROG
... (see 8.4).
00: 07.13 pH
<ADJ>
7.00 pH
< OK >
00: 07.00 pH
restore the
<CLR>
º