Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 63 / 288

SFC
Functions
4.
63
Trouble-shooting and
debugging when the measuring
signal is too low or irregular
1 Remove air bubbles on the membrane (G) by lifting the
membrane sensor; air bubbles prevent the ozone from
diffusing through the membrane (G) and distort the
measurement!
Please note
Air bubbles on the electrode shaft (B) and the membrane cap (E)
are normal following the initial startup and subsequent startups
and they disappear by themselves after one or two days.
2 Replenish electrolyte. Open membrane sensor. To do this,
push the elastomer seal (H) to the side so that air can flow in
through the valve opening (F), and only then screw off the
membrane cap (E). Pour out the electrolyte. Wash the
electrode finger (D) and the membrane cap (E) with clean
(distilled) water and dry with a clean paper towel.
Please note
For further procedures, see “Commissioning“. If the membrane
sensor's measuring signal is still too low or irregular, a new
membrane cap (E) must be used. The membrane sensor then
requires a run-in time of approx. one hour, before a calibration can
be carried out.
4.2.7 mA/V input module
The mA/V input module is used for connecting sensors or external
measurements with mA or voltage output signal. 0/4 – 20 mA
signal or 0 – 10 V input voltage are possible.
Various controller functions are available depending on the
application selected. If the mA/V module is used with the „Process
Control“ option (PC), compound loop and single feed forward are
also available.
As measured value display, the unit and display format can be
freely selected in the menu.
4.2.8 Temperature measurement
The A&C board of SFC has a temperature measurement for
connecting a PT1000 sensor (multi-sensor). This temperature
measurement is used for temperature compensation of the „DES“
module and pH measurement. The temperature is shown on the
main display and can be calibrated if necessary. The measuring
range is 0 – 50°C. The unit may be adjusted to °F.