Xylem IQ SensorNet FDO 70x IQ (SW) - Manual (Page 29)

FDO
®
70x IQ (SW) Maintenance, cleaning, replacement parts
5 - 3 ba76014e01 02/2012
Mounting the sensor
cap
5.4 Cleaning the sensor
5.4.1 Exterior cleaning
Dirt on the sensor can affect the measuring characteristics. Biological
deposits for example, consume oxygen and can, when occurring on the
sensor cap membrane, impair the responding behavior and cause val-
ues that are too low. Therefore, we recommend regular visual inspec-
tions and exterior cleaning as necessary.
Pay attention to the following points for cleaning:
 First, thoroughly rinse the sensor with tapwater to remove loosely
adhering dirt.
 Rough dirt on the sensor shaft can be brushed off with a soft brush.
Attention: Do not use the brush in the area of the sensor membrane.
Risk of damage!
 The sensor cap including the sensor membrane should be wiped
with a soft and moist microfiber cloth.
 In the case of persisting dirt you can add some household washing-
up liquid to the tapwater. Attention: Never use any alcohol for clean-
ing!
 If the are any salt or lime deposits, the sensor can be cleaned with
aqueous citric acid solution (10 % weight percent).
6 Check the front surface of the sensor for absolute cleanness
and clean it if necessary (see section 5.4.1).
7 Thoroughly clean the thread of the fixing ring.
8 Place the new sensor cap on the sensor so that the tempera-
ture sensor fits into the hole inside the sensor cap (see figure
opposite).
9 Put the fixing ring on the sensor head and screw it tight by
hand.