Sample point
pH measurement
mV measurement
Temperature measurement
Free chlorine measurement
(R363)
5
Before the exact location of the electrodes is finalised, it is worthwhile to carry
out a measuring profile of the process stream to ensure that the required homoge-
neity is being achieved. As a general rule the electrodes should protrude into the
process stream by one-third of the pipe width and be positioned so as to avoid gas
pockets or sediments.
Generally the measuring electrodes are inserted into the flow with the sample
pick-up facing downstream in order to reduce the risk of blockage by suspended
material.
All sensors are usually positioned vertically at a suitable point downstream of the
dosing point, where the measurements are stable and reliable. The response of the
dosing system will be affected by the time required to disperse the reagents and
their arrival at the measuring point.
1. Select the desired mode with çè. The display will immediately show the
measured value according to the previous calibration. Should you want to rec-
alibrate, press CAL.
2. The display shows five of the 9 buffers in memory (1.68, 4.00, 4.01, 6.87, 7.00,
9.18, 9.21, 10.01, 12.45). Select the proper values and press CAL. The unused
buffers should be switched off.
3. Rinse the electrodes with distilled water and immerse them in the first buffer
solution. Select [CALIBRATE], press CAL and follow the instructions on the
screen until the calibration is finished.
4. After rinsing the electrodes with distilled water, immerse them in the samples
and read the display.
5. Rinse the electrodes always with distilled water after use and store them in a
3...4 M KCl solution.
•
Press ê to change the resolution from 0.1 to 0.001 pH.
1. Select the desired mode with çè. The display will immediately show the
measured value according to the previous calibration. Should you want to rec-
alibrate, press CAL.
2. Rinse the electrodes with distilled water and immerse them in a standard solu-
tion of known potential. Select [CALIBRATE], press CAL, adjust to the correct
value and press CAL.
•
Press ê to change the resolution from 1 to 0.1 mV.
Select [RESET] and press CAL to reset the calibration.
•
1. Select the desired mode with çè. Without Pt1000, adjust the manual tem-
perature compensation and press CAL. Should you want to recalibrate, press
CAL.
2. Immerse the Pt1000 in a standard solution of known temperature. Select
[CALIBRATE], press CAL, adjust to the proper value and press CAL.
•
Select [RESET] and press CAL to reset the calibration.
1. Select the desired mode with çè. The display will immediately show the
measured value according to the previous calibration. Should you want to rec-
alibrate, press CAL.
2. Let the electrodes rest in the water stream for at least 24 hours (all dosing
systems switched off). Measure the free chlorine accurately with a suitable
photometer immediately before calibration. Select [CALIBRATE], press CAL,
adjust to the proper value and press CAL.
R361 • R362 • R363