pH 170/
pH 296
Calibration
160
AutoCal TEC with buffer value
AutoCal 2
REL 1
REL 1 pulled up
REC 1 frozen
REL 1 pulled up
REC 1 frozen
If the calibration is not o.k., REL 1
remains pulled up and REC 1 frozen
and a return is made to the start: "Start calibration".
READ
buffer 1
via
REC 1
READ
buffer 2
via
REC 1
Measuring
Display
buffer 2
Display
buffer 1
current meas. value
5 s
5 s
t
only if
calibration o.k.
REC 1
Start of
calibration
End of
calibration
Buffer 1
Buffer 2
Techn.
buffer 1
Techn.
buffer 2
After terminating the calibrating process, the relevant buffer value for every
5s
is
output at the recorder REC 1.
REL 1 is used for synchronization.
Note:
For the buffer value output, the range of Rec1 is always pH 0 to pH 14
(not dependent on the set recorder range).
Formulas for conversion of pH to current:
1. Setting of 0 to 20 mA
I = 20 mA
. buffer value [pH]
14
pH
[ ]
buffer value= 14 pH . I [mA]
20
mA
[ ]
2. Setting of 4 to 20 mA
I = 4 [mA] + 16 mA
. buffer value [pH]
14
pH
[ ]
buffer value= 14 pH . (I[mA] - 4[mA])
16 mA
[ ]
