Polymetron SODIMAT 9073, Instruction Manual

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SODIMAT - Model 9073
6-3
6.3.1 CARCAL calibration
To use both 20 and 200 ppb CARCAL cartridges, the sample should not exceed 6 ppb of
sodium. If not, the use of a mixed-bed cartridge is required. However, a one point calibration
at 200 ppb is possible without a mixed-bed cartridge ; then enter in command 261 the value
of the slope indicated in the certificate given with the sodium selective electrode (in % of the
theoric slope).
Note on command 220 :
- In case of gaseous conditionning, sample pH before it enters the analyser, has to be
programmed.
- In case of liquid conditionning (kit K), sample pH has to be measured in the
measuring cell.
Command Argument Function
201 0 Calibration by known additions (carcal/autocal)
211 0 Use of CARCAL calibration cartridge
220 --- Sample pH value for the correction of the CARCAL value
221 0 One point calibration
1 Two point calibration
231 --- Value of the concentration addition 1 calculated for 4 l/h
and 25
E
C
241 --- Value of the concentration addition 2 calculated for 4 l/h
and 25
E
C
251 [0.0*] Drift value of the normality voltage at 25
E
C
261 [100*] Slope value at 25
E
C in % of the theoric slope (59,16 mV
per decade)
271 [20*] Maximum time by calibration point in minutes
To launch the calibration,adjust the sample flowrate at 4.0 l/h. Press SELECT to leave the
PROGRAMMATION mode, press the lower key till CAL is displayed. Press ENTER, ---
appears and then CAR1. Remove the filter from the carcal holder and replace it by the first
CARCAL (200 ppb).
Press ENTER. After the time programmed in C271, the measurement of the first calibration
point is taken into account.
CAR2 is then displayed.
Remove the first CARCAL from the holder and insert the second CARCAL (20 ppb). Press
ENTER. After the time programmed in C271, the measurement of the second calibration
point is taken into account.