Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 203 / 288

SFC
Operation
6.
203
6.4.2 3-electrode cell (DEPOLOX
®
5 and DEPOLOX
®
Pool)
calibration
Calibration of the 3-electrode cell for Cl
2
, KMnO
4
, O
3
, ClO
2
and
Cl
2
++ (pH-compensated).
Before Cl
2
++ calibration, it must be ensured that the pH
measurement is calibrated correctly.
During calibration of the 3-electrode cell, perform a zero point
calibration and a measurement value calibration (DPD).
The calibration process is nearly the same for chlorine, chlorine
dioxide, ozone and potassium permanganate.
The difference lies in the fact that some of the reagents are
measured with a photometer and others with a colour meter.
Zero point calibration
1 Starting from the basic display in the main menu select the
"Calibration" menu.
2 Select the measurement to be calibrated from the menu, e.g.
Cl
2
free.
3 Select the "Cal. zero" parameter.
4 Close the ball valve on the sample water inlet.
Please note
When the sample water supply has been stopped, the display first
drops rapidly, and after approximately one minute slowly
approaches zero. During commissioning it is essential to wait for 5
minutes, even if the display is already blinking or stands at "0.00"
after a few seconds.
5 Wait until the displayed value or the µA-sensor signal no
longer changes for at least one minute.
6 Press the "ENTER" softkey to set the display to zero and
press „Enter“ again to save the value.
7 Press the softkey „Back“.
Zero point calibration with
disinfectant-free water
8 If disinfectant-free water (e.g. by switching off the dosing
system) is available, zero point calibration can be performed
with it. To do this, switch off the dosing system and perform
steps 1, 2, 3, 5 and 6. The delay times for sample water
extraction and dosing must be observed here (waiting time)!
9 Open the ball valve on the sample water inlet.